What is Advance Tax & Assessment Procedures in CS Executive?

Advance Tax & Assessment Procedures is a topic in the Taxation syllabus of CS Executive. It carries a weight of 3% in the exam. Our notes cover the key concepts, formulas, and problem-solving approaches you need to master this topic.

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Advance Tax & Assessment Procedures

🟢 Lite — Quick Review (1h–1d)

Rapid summary for last-minute revision before your exam.

Advance Tax & Assessment Procedures — Key Facts for CS Executive

Advance Tax is payable when tax liability exceeds ₹10,000 after TDS. Installments: 15% by 15th June, 30% by 15th September, 45% by 15th December, 60% by 15th March (FY 2024-25).
Self-Assessment Tax (Section 140A): Pay before filing return. Formula: Tax payable − TDS − Advance Tax.
Return Due Dates: Companies → 30th September; Tax Audit cases → 31st October; Other assessees → 31st July.
Belated Return (Section 139(5)): Additional fee of ₹1,000 (≤₹5L income) or ₹5,000 (>₹5L income); no loss carry forward allowed.
Revised Return (Section 139(9)): File before end of relevant assessment year or before assessment completion, whichever is earlier.
Refund Interest (Section 244A): 0.5% per month or part on excess tax paid.
Assessment Types: Section 143 (Scrutiny), Section 144 (Best Judgment), Section 147 (Reassessment).
Reassessment Notice (Section 148): Can be issued within 4 years from AY end; beyond 4 years requires income escape of ≥₹1 lakh.
Penalties: Section 270A concealment → 50%–200% of tax; Section 271 default → up to ₹10,000 per day.
TDS Late Filing (Section 234E): ₹200 per day until filing (max = TDS amount).
Tax Audit Late Filing (Section 234F): ₹150 per day (up to ₹1.5 lakh).

⚡ Exam Tip: Most-frequently asked: Compute advance tax liability with installment schedule, difference between Section 143/144/147, penalty calculations under Section 270A.

⚡ Exam Tip: For refund questions, always calculate interest at 0.5% per month from the date of excess payment to date of refund.

🔴 High Priority: Section 140A self-assessment tax computation and Section 143 assessment procedure are most likely to appear in exam questions.

🟡 Standard — Regular Study (2d–2mo)

Standard content for students with a few days to months.

1. Advance Tax (Sections 207–210 of Income Tax Act, 1961)

1.1 Meaning and Statutory Framework

Advance tax refers to the tax payable by a taxpayer in advance during the financial year, based on their estimated income for that year. Unlike self-assessment tax, which is paid at the end of the year after computing the actual tax liability, advance tax requires taxpayers to anticipate their tax liability and pay it in installments as the year progresses. The provisions relating to advance tax are contained in Sections 207 to 210 of the Income Tax Act, 1961.

The fundamental rationale behind advance tax is to ensure a steady flow of revenue to the government throughout the year, rather than waiting for the entire tax liability to be paid after the assessment is completed. This also reduces the burden on the taxpayer of paying a large lump sum at the time of filing the return.

1.2 Who Must Pay Advance Tax?

Under Section 207 of the Income Tax Act, 1961, advance tax is payable if:

The assessee is a resident individual, Hindu Undivided Family (HUF), firm, company, or any other assessee; AND
The advance tax payable (i.e., total tax liability after deducting TDS and relief under Sections 90/90A/91) exceeds ₹10,000 in the relevant financial year.

Key Points:

The liability to pay advance tax arises only when the net tax liability after all deductions exceeds ₹10,000. If tax liability is ₹10,000 or less, no advance tax is required.
For salaried employees, advance tax is usually not a concern because tax is deducted at source (TDS) from their salary. However, if they have income from other sources (such as house property, capital gains, or business/profession), and the net tax after TDS exceeds ₹10,000, they may still be required to pay advance tax.
Non-residents are not liable to pay advance tax, even if their tax liability exceeds ₹10,000.

🔴 High Priority — Exemption from Advance Tax

The following categories of assessees are exempt from advance tax liability:

Category	Reason
Resident senior citizens (age 60 years or above)	Exempt if no income from business/profession
Resident super senior citizens (age 80 years or above)	Exempt if no income from business/profession
Agricultural income earners (only source)	Agricultural income is exempt
Assessees whose only income is from salary with TDS deducted	TDS usually covers entire liability

Important: Senior citizens who have income from house property or other sources (not business/profession) are also exempt from advance tax under the specific exemption provided in Section 207.

1.3 Estimate of Income

Under Section 209 of the Income Tax Act, 1961, an assessee who is required to pay advance tax must submit an estimate of their income for the relevant financial year. This estimate is used to compute the advance tax liability.

Computation of Advance Tax Estimate:

Step 1: Estimate total income for the financial year
        (Include all heads: Salary, House Property, P&GP, Capital Gains, Other Sources)

Step 2: Compute gross tax liability on estimated income
        (Apply slab rates for individuals/HUF or rates applicable to respective assessee)

Step 3: Deduct:
        (a) Tax deducted at source (TDS) from your income
        (b) Relief under Sections 90, 90A, 91

Step 4: Advance Tax Liability = Gross Tax − TDS − Relief
        (If this exceeds ₹10,000, advance tax is payable)

Manner of Submission of Estimate:

The estimate may be submitted voluntarily by the assessee.
The Assessing Officer may also, by notice under Section 210, require the assessee to pay advance tax based on the officer’s own estimate of the assessee’s income.
The assessee can revise the estimate during the year if there is a material change in income.

⚡ Exam Tip: When computing advance tax, students must remember that the estimate is based on the current year’s income (financial year), not the previous year’s income. However, in practice, assessees often use the previous year’s income as a proxy.

1.4 Computation and Payment of Advance Tax — Installment Schedule

The advance tax must be paid in installments as per the schedule prescribed under Section 211 of the Income Tax Act, 1961 and the Finance Act of the relevant year.

The installment schedule for Financial Year 2024-25 (Assessment Year 2025-26) is as follows:

Installment	Due Date	Percentage of Advance Tax
1st Installment	15th June 2024	15% of advance tax liability
2nd Installment	15th September 2024	30% of advance tax liability
3rd Installment	15th December 2024	45% of advance tax liability
4th Installment	15th March 2025	60% of advance tax liability

Note: The percentages are cumulative, meaning:

By 15th June: Pay 15% of total advance tax
By 15th September: Pay cumulative 30% (i.e., 15% + 15% more)
By 15th December: Pay cumulative 45% (i.e., 30% + 15% more)
By 15th March: Pay cumulative 60% (i.e., 45% + 15% more)

🔴 High Priority: The installment schedule percentages are NOT 15%, 30%, 45%, 60% of the total separately, but rather cumulative milestones. This is a very common confusion point in exams.

💡 Example — Advance Tax Computation

Problem: Mr. Rahul (age 35) has estimated total income for FY 2024-25 as ₹12,00,000 (after deductions). He has TDS deducted of ₹85,000 from his salary. Compute his advance tax liability and installment schedule.

Solution:

Step 1: Compute tax liability:
        Total Income = ₹12,00,000
        Deductions already considered above

        Tax Calculation (New Regime FY 2024-25):
        Up to ₹3,00,000 = NIL
        ₹3,00,001 to ₹7,00,000 = ₹4,00,000 × 5% = ₹20,000
        ₹7,00,001 to ₹12,00,000 = ₹5,00,000 × 15% = ₹75,000
        Total Tax = ₹20,000 + ₹75,000 = ₹95,000
        Cess @ 4% = ₹3,800
        Total Tax Liability = ₹98,800

Step 2: TDS already deducted = ₹85,000
Step 3: Balance Tax = ₹98,800 − ₹85,000 = ₹13,800
Step 4: Since ₹13,800 > ₹10,000, advance tax is payable

Step 5: Advance Tax Liability = ₹13,800

Installment Schedule:
- 1st (by 15 Jun): 15% of 13,800 = ₹2,070
- 2nd (by 15 Sep): Additional 15% = ₹2,070
- 3rd (by 15 Dec): Additional 15% = ₹2,070
- 4th (by 15 Mar): Additional 15% = ₹2,070
- Total Paid = ₹8,280

Self-Assessment Tax (to pay with return) = 13,800 − 8,280 = ₹5,520

⚡ Exam Tip: Always check if the balance tax after TDS is more than ₹10,000 before concluding that advance tax is applicable. The ₹10,000 threshold is applied on the net tax payable after TDS and relief, not the gross tax.

1.5 Consequences of Non-Payment or Short Payment of Advance Tax

Under Section 218 and Section 219 of the Income Tax Act, 1961:

If an assessee fails to pay advance tax, interest under Section 234B is leviable.
Section 234B: If advance tax paid is less than 90% of the assessed tax (i.e., tax determined on regular assessment), simple interest at 1% per month (or part of a month) is charged on the shortfall from the due dates until the date of regular assessment.
The interest under Section 234B is computed on the amount of shortfall in advance tax payment.

Section 234C deals with interest for deferment of advance tax installments. If the advance tax paid in any installment is less than the specified percentage, interest is charged at 1% per month for the period of deferment.

Section 234B — Shortfall in Advance Tax:
Prerequisite: Advance tax paid < 90% of assessed tax
Rate: 1% per month (simple interest)
Period: From due date of first installment to date of regular assessment

⚡ Exam Tip: Section 234B interest is NOT charged if advance tax paid is 90% or more of the assessed tax, even if it is not 100%. The 90% threshold provides some relief.

2. Self-Assessment Tax (Section 140A)

2.1 Meaning and Statutory Provision

Section 140A of the Income Tax Act, 1961 requires every assessee to pay self-assessment tax before filing the return of income. Self-assessment tax is the balance tax remaining after accounting for:

Tax liability computed on the total income declared in the return
Less: Tax deducted at source (TDS)
Less: Tax collected at source (TCS)
Less: Advance tax already paid during the financial year
Less: Relief claimed under Sections 90, 90A, and 91

Section 140A Formula:

Self-Assessment Tax = Tax Payable (on returned income) 
                      − TDS 
                      − TCS 
                      − Advance Tax Paid 
                      − Relief (Sections 90/90A/91)

2.2 Computation of Self-Assessment Tax

Step-by-Step Process:

Compute Total Income: Add income under all heads after claiming all deductions.
Compute Tax Liability: Apply the applicable slab rates or corporate tax rates.
Add Cess: Add 4% Health and Education Cess.
Deduct TDS: Subtract all TDS certificates/credits available.
Deduct TCS: Subtract tax collected at source.
Deduct Advance Tax: Subtract advance tax already paid in installments.
Deduct Relief: Subtract relief claimed under DTAA or Section 91.
Balance = Self-Assessment Tax: This amount must be paid before or at the time of filing the return.

2.3 Payment Procedure for Self-Assessment Tax

The self-assessment tax is payable through:

Online Mode (preferred):
- Through income tax portal (www.incometax.gov.in)
- Using Challan ITNS 280
- Select “Self-Assessment Tax” (Tax Code 300)
Challan Payment:
- Fill Challan ITNS 280
- Select appropriate tax payment type
- Pay at authorized bank branches

Key Requirement: The self-assessment tax must be paid before filing the return under Section 139(1). The return is not validly filed if the self-assessment tax is not paid. The acknowledgment of the return is not complete without proof of payment.

2.4 Consequences of Non-Payment

If self-assessment tax is not paid:

The return filed is treated as defective under Section 139(9)
Interest under Section 220(2) may be charged at 1.5% per month (simple interest) on the outstanding tax from the date the tax became due until payment
The Assessing Officer may initiate recovery proceedings

⚡ Exam Tip: Section 140A states that self-assessment tax must be paid before issuing the return. While technically the return can be filed on the same day as payment, the payment must precede the filing or happen simultaneously.

3. Return of Income (Section 139)

3.1 Statutory Requirement to File Return

Section 139(1) of the Income Tax Act, 1961 makes it mandatory for certain categories of persons to file a return of income. The return must be filed in the prescribed form (ITR-1 to ITR-7 depending on the category of assessee) and within the prescribed due dates.

3.2 Due Dates for Filing Return

🔴 High Priority — This is a very frequently tested area in CS Executive exams:

Category of Assessee	Due Date	Relevant Section
Company	30th September of the assessment year	Section 139(1)(a)
Person (other than company) whose accounts are required to be audited under any law (Tax Audit cases)	31st October of the assessment year	Section 139(1)(b)
Working Partner of a firm (whose accounts are required to be audited)	31st October of the assessment year	Section 139(1)(b)
Any other assessee (including individuals, HUFs, firms not requiring audit)	31st July of the assessment year	Section 139(1)(c)

Note: For FY 2024-25 (AY 2025-26), the due dates have been extended by the CBDT via notifications. However, the statutory due dates under Section 139 remain as stated above unless a specific extension is notified. Students should check the latest notifications during exam preparation.

3.3 Compulsory Filing of Return

Under Section 139(1), the following persons are required to file return compulsorily:

Every company and firm
Every person (other than company/firm) if:
- He is a resident and has assets (including financial interest in any entity) located outside India; OR
- He is a resident not ordinarily resident (RNOR) and has income from any source in India; OR
- His total income (before deductions under Chapter VI-A) exceeds the basic exemption limit (₹3,00,000 for individuals below 60 years, ₹₹3,50,000 for senior citizens, ₹5,00,000 for super senior citizens under new tax regime)
Every person who is a representative assessee (e.g., trustee, guardian)
Any person claiming refund of tax deducted at source or any excess payment
Persons filing return for carry forward of losses

3.4 Types of Returns

Table: Types of Returns under Section 139

Return Type	Section	Description	When to File
Original Return	139(1)	First/Original return filed	By due date
Belated Return	139(5)	Return filed after due date	After due date but before completion of assessment
Revised Return	139(9)	Return filed to correct errors/omissions	Within 4 years from AY end or before assessment completion
Defective Return	139(9)	Return lacking required details	Officer may call for correction

4. Belated Return (Section 139(5))

4.1 Meaning

When an assessee fails to file the return by the due date specified under Section 139(1), but files it after that date (but before the assessment is completed), it is called a belated return or return filed under Section 139(5).

4.2 Additional Fee

Under Section 139(5), a belated return is subject to an additional fee (not a penalty in the strict sense):

Situation	Additional Fee
If total income does not exceed ₹5,00,000	₹1,000
If total income exceeds ₹5,00,000	₹5,000

Important: This fee is payable in addition to the tax and interest (if any) due. It is automatic and must be paid along with the return.

4.3 Consequences of Filing Belated Return

🔴 High Priority — Several restrictions apply to belated returns:

Losses cannot be carried forward: Under Section 139(5), if a return is filed after the due date, losses under any head cannot be carried forward to subsequent years. This is a significant disadvantage.
No interest on refund: If a refund is due, interest under Section 244A will be paid only from the date of filing the belated return (not from the original due date).
Additional fee: The additional fee as mentioned above is mandatory.
Processing: The return will be processed under Section 143(1), but any loss claim will not be allowed.
Assessment may be made: The AO may still proceed to make an assessment under Section 143(3) or 144 independently.

⚡ Exam Tip: The most critical consequence of a belated return is the loss of carry forward of losses. This is a favorite exam question. If the assessee has a business loss or capital loss, they must file on time to preserve the right to carry it forward.

4.4 Conditions for Filing Belated Return

The return must be filed after the due date but before the assessment is completed by the Assessing Officer.
There is no upper time limit for filing a belated return as long as the assessment has not been completed. However, once assessment is completed, the return cannot be filed.
The belated return must be filed in the same form (ITR) as would have been applicable had it been filed on time.

5. Revised Return (Section 139(9))

5.1 Meaning

A revised return under Section 139(9) allows an assessee to correct a return that has already been filed, if the original return was:

Defective (i.e., it had any omission or incorrect statement); or
If the assessee discovers any omission or wrong statement after filing

A return is treated as defective under Section 139(9) if:

The annexures, statements, or columns in the return are incomplete or not filled in properly
The return does not include the PAN
The tax payable as per the return is more than the TDS and advance tax combined (without including interest)
The refund claimed is excessive
Loss return is filed but annexures are incomplete
Any Schedule or information required under the Act is not provided

5.2 Time Limit for Filing Revised Return

🔴 High Priority — Time limit for revised return is a critical exam point:

The revised return can be filed:

At any time within 4 years from the end of the relevant assessment year; OR
Before the completion of the assessment, whichever is earlier.

Example: AY 2025-26 (FY 2024-25)
- End of AY = 31st March 2026
- 4 years from AY end = 31st March 2030
- But if assessment is completed on, say, 15th December 2026, 
  the revised return must be filed before 15th December 2026

5.3 What Can Be Revised?

The assessee can revise:

Any income omitted or under-reported
Any claim for deduction not made originally
Any incorrect particulars
Any other details in the original return

5.4 What Cannot Be Revised?

The return cannot be revised to change the accounting year or jurisdiction
Cannot file a revised return if the original return was a nil return filed voluntarily
Once the assessment is complete, revision is not permitted

⚡ Exam Tip: The time limit is “end of relevant assessment year OR before completion of assessment, whichever is earlier.” This “whichever is earlier” condition is very important. If assessment is completed first, the window for revision closes even if the AY has not ended.

6. TDS Credit and Matching (Section 200A)

6.1 TDS — Basic Concept

Tax Deducted at Source (TDS) is a system where the payer of income deducts tax at a prescribed rate before making payment to the recipient. The deducted tax is remitted to the government by the deductor. The recipient gets credit for TDS against their tax liability.

6.2 TAN — Tax Deduction and Collection Account Number

Under Section 203A of the Income Tax Act, 1961, every person responsible for deducting tax (except certain notified persons) must obtain a TAN (Tax Deduction and Collection Account Number). The TAN is a 10-digit alphanumeric number that must be quoted in all:

TDS returns ( quarterly statements)
TDS certificates (Form 16, 16A, etc.)
Challans for TDS payment

6.3 TDS Credit and Matching under Section 200A

Section 200A of the Income Tax Act, 1961 provides for the computerized processing of TDS statements (Form 24Q, 26Q, 27Q, 27EQ) filed by deductors.

The matching process under Section 200A involves:

TAN-based Matching: The TDS details are matched against the PAN of deductees as quoted in the TDS statement.
Verification of TDS: The system verifies:
- Whether TDS has been deposited with the government
- Whether the TDS amount matches the PAN of the deductee
- Whether the PAN is valid
- Whether the TDS rate is correct
Discrepancies Identified:
- If TDS claimed by deductee > TDS actually deposited by deductor → Discrepancy
- If PAN is invalid/missing → TDS credit may not be allowed
- If TDS credit claimed in wrong FY → Adjustment may be made
TDS Certificate: The deductee must obtain a TDS certificate from the deductor to claim credit. Form 16 (salary), Form 16A (other payments), Form 16B/16C (immovable property/certain payments).

6.4 Correction Statements under Section 200A

If discrepancies are found:

A correction statement (Corris) can be filed by the deductor
The credit is given only after proper verification
The deductee can claim TDS credit in the return based on:
- TDS amounts appearing in Form 26AS (Annual Tax Statement)
- TDS certificates issued by the deductor

6.5 Form 26AS

Form 26AS is a consolidated tax statement that shows:

All TDS deducted by various deductors
All TCS collected
All tax deposited (including advance tax, self-assessment tax)
Refund received in previous years

Every assessee should verify Form 26AS before filing the return to ensure all TDS credits are properly claimed.

⚡ Exam Tip: The matching under Section 200A is a TAN-based and PAN-based computerized process. The key point is that TDS credit is given only when:

The deductor has actually deposited the TDS; AND
The deductee’s PAN is correctly quoted in the TDS statement.

7. Refund Mechanism (Sections 237–245)

7.1 Meaning of Refund

A refund arises when the total tax paid by an assessee (through TDS, TCS, advance tax, self-assessment tax) exceeds the actual tax liability determined after assessment. The excess payment is recoverable from the government.

7.2 Claim for Refund

Under Section 237 of the Income Tax Act, 1961, a claim for refund must be made by:

Filing the return of income (the return itself acts as a claim for refund)
Filing a refund claim separately in Form No. 30 (not commonly used now)

The claim must be filed within:

One year from the last day of the relevant assessment year; OR
Before the completion of assessment, whichever is earlier

7.3 Processing of Refund

Under Section 240, if the return is processed and a refund is found due, the Assessing Officer shall refund the amount without requiring any formal application from the assessee. The refund is credited to the assessee’s bank account (ECS/NFT/RTGS).

The processing of returns and refunds is done under:

Section 143(1): Summary assessment with automatic refund processing
Section 143(3): Scrutiny assessment where refund may be adjusted against outstanding tax

7.4 Interest on Refund (Section 244A)

🔴 High Priority — Interest on refund is a key exam topic:

Under Section 244A of the Income Tax Act, 1961, if any refund is due to the assessee, simple interest is payable as follows:

Situation	Rate of Interest
Refund of tax paid voluntarily (advance tax, self-assessment tax)	0.5% per month or part of a month
Refund of TDS/TCS	0.5% per month or part of a month
Refund arising from excess deduction due to error/omission in TDS statement	0.5% per month from the date of claim

Important Points:

Interest is calculated on the net tax overpaid (not the gross tax)
Interest is calculated from the date of overpayment (or from the date of filing return in case of belated return) to the date of refund
Interest is simple interest (not compound)
Rate: 0.5% per month or part of a month (this effectively means 6% per annum, but calculated monthly on simple basis)
No interest is payable if the refund amount is less than 10% of the tax determined
Section 244A(1B): If the refund arises from an assessment, interest is from the date of overpayment to the date of assessment

Section 244A(2): Interest is not payable if:

The refund arises from an assessment and the return was filed after the due date (interest starts from the date of filing the belated return)
The refund is less than 10% of the tax determined
The refund arises from TDS where the PAN was not quoted or was invalid (unless the deductee subsequently provides PAN)

💡 Example — Interest on Refund

Problem: Ms. Priya filed her return for AY 2025-26 on 25th July 2025 (within time). The return shows:

Total tax liability: ₹2,50,000
TDS credit: ₹3,10,000
Advance tax paid: Nil
Self-assessment tax: Nil
Refund due: ₹60,000

The refund was issued on 15th October 2025. Calculate interest on refund under Section 244A.

Solution:

Excess Tax Paid = TDS − Tax Liability = 3,10,000 − 2,50,000 = ₹60,000

Period for Interest:
From: Date of filing return = 25th July 2025
To: Date of refund = 15th October 2025

July 2025 (from 25th July): Part month = 1 month (July 25 to Aug 25)
August 2025: Full month = 1 month
September 2025: Full month = 1 month
October 2025 (up to 15th): Part month = 1 month (approximately)

Total period = 4 months (approximately)

Interest = Refund Amount × Rate × Period
         = 60,000 × 0.5% × 4 months
         = 60,000 × 0.005 × 4
         = ₹1,200

Interest on Refund = ₹1,200

⚡ Exam Tip: The key for Section 244A is “0.5% per month or part of a month.” Even if a refund is pending for just a few days, one full month of interest is added. This “part of a month” provision is important.

7.5 Adjustment of Refund

Under Section 245 of the Income Tax Act, 1961, if any outstanding tax is due from the assessee, the department can:

Set off the refund against the outstanding tax
Issue a notice to the assessee before making such adjustment
The assessee has the right to claim that the set-off is not permissible

7.6 Refund Cannot Be Withheld

Under Section 245, the department cannot withhold a refund merely because the assessee has not filed returns for other years. However, if there are outstanding taxes, the refund can be adjusted.

8. Assessment Procedures

8.1 Types of Assessment

The Income Tax Act provides for the following types of assessments:

Assessment Type	Section	Description
Summary Assessment	143(1)	Processing of return without scrutiny
Scrutiny Assessment	143(3)	Detailed examination of return with inquiry
Best Judgment Assessment	144	Assessment when assessee fails to comply
Reassessment	147	Reopening of completed assessment
Income Escaping Assessment	147	Income not assessed or underassessed

8.2 Summary Assessment under Section 143(1)

Section 143(1) provides for a summary assessment where the return is processed electronically. The Assessing Officer:

Computes the total income/loss
Verifies TDS credits, deductions claimed
Allows or disallows deductions
Determines tax liability
Issues refund if due

Key features of Section 143(1):

No personal hearing or inquiry
Refund is issued automatically if due
If any tax is outstanding, a demand notice is issued
Time limit: Must be completed within 9 months from the end of the month in which the return was filed (i.e., by 31st December of the AY if return filed on 31st July)

What Section 143(1) does NOT do:

It does not verify the correctness of the income claimed
It does not call for supporting documents
It does not allow or disallow expenses not claimed
The AO cannot make a best judgment assessment under this section

8.3 Scrutiny Assessment under Section 143(3)

🔴 High Priority — This is the most detailed assessment procedure and a frequent exam topic:

Under Section 143(3), if the Assessing Officer is not satisfied with the correctness or completeness of the return, he may conduct a scrutiny assessment.

Procedure for Scrutiny Assessment:

Notice under Section 143(2): The AO must issue a notice to the assessee within 3 months from the end of the month in which the return was filed, calling for production of documents and evidence in support of the return.
Time Limit for Completion: The assessment must be completed within:
- 12 months from the end of the month in which the return was filed (for AY 2024-25 onwards)
- Earlier, it was 21 months (extended due to COVID for certain years)
Inquiry: The AO may conduct inquiry by:
- Calling for books of accounts
- Requiring production of documents
- Examining the assessee or witnesses
- Seeking information from third parties
Draft Assessment Order: For certain cases (like international transactions), a draft order is prepared and sent to the assessee for objections.
Final Order: After considering the assessee’s response and evidence, the AO passes the final assessment order.

What happens after scrutiny:

Tax demand is raised if additional tax is found due
Refund is issued if excess tax was paid
Penalties may be imposed under various sections
Prosecution may be initiated in serious cases

⚡ Exam Tip: The notice under Section 143(2) must be served within 3 months from the end of the month in which the return was filed. If this notice is not served within time, the assessment cannot be completed under Section 143(3). This is a jurisdictional issue.

8.4 Best Judgment Assessment under Section 144

Under Section 144 of the Income Tax Act, 1961, the Assessing Officer can make a best judgment assessment in the following circumstances:

The assessee fails to file the return under Section 139(1) or in response to a notice under Section 142(1)
The assessee fails to comply with the terms of a notice issued under Section 142(1) (to produce books/documents)
After filing the return, the assessee fails to comply with the directions in a notice under Section 142(2) (for special audit)
The AO is not satisfied with the return even after hearing evidence

Key Features of Section 144:

The AO makes the assessment to the best of his judgment
The assessment is based on the information available with the AO
The AO can estimate the income based on:
- Nature of business/occupation
- Investments, assets, and lifestyle
- Previous year’s income (if available)
- Bank deposits, property holdings
A show cause notice must be issued before making the assessment
Interest under Section 234B is charged on the additional tax (since advance tax provisions apply)
Penalties may also be levied

Difference between Section 143(3) and Section 144:

Aspect	Section 143(3) — Scrutiny	Section 144 — Best Judgment
Basis	Based on return and inquiry	Based on best judgment when assessee fails to cooperate
Notice	143(2) notice required	Notice under 142(1) required
Assessee cooperation	Can cooperate with AO	Assessee fails to cooperate
Type of inquiry	Detailed	Depends on information available

⚡ Exam Tip: Section 144 is a residual assessment — it applies when the assessee doesn’t comply. The “best judgment” is the AO’s judgment, not a penalty. However, the AO must still have some basis for the income estimated.

8.5 Reassessment under Section 147

🔴 High Priority — Reassessment provisions are heavily tested in exams:

Section 147 of the Income Tax Act, 1961 provides for reassessment of income that has escaped assessment or has been underassessed.

Grounds for Reassessment (Section 147):

Income is deemed to have escaped assessment if:

No return was filed under Section 139(1) or in response to a notice under Section 142(1)
The return was filed but income has escaped assessment due to:
- Omission or failure to disclose material facts
- Incorrect reporting of income
- Claim of exemption/deduction without proper basis
Transfer pricing adjustments were not made
Income from undisclosed sources
Income from foreign assets (after Demonetization and Black Money Act provisions)

8.6 Issue of Notice under Section 148

To initiate reassessment, the Assessing Officer must issue a notice under Section 148.

Notice under Section 148 requires the assessee to file a return of income for the relevant assessment year, if the AO has reasons to believe that income has escaped assessment.

Time Limits for Issuing Notice under Section 148:

Situation	Time Limit
Standard cases	Within 4 years from the end of the relevant assessment year
Beyond 4 years (if income escaped ≥ ₹1 lakh and there was omission/failure to disclose)	Within 6 years from the end of the relevant AY
Beyond 4 years (where assessment was made under Section 143(3) and escapement is due to fraud)	Within 16 years from the end of the relevant AY

🔴 High Priority — The “4-year rule” is extremely important:

If the income escaped is less than ₹1 lakh in a year, the AO cannot reopen after 4 years even if there was non-disclosure
The AO must have reason to believe, not mere suspicion, that income has escaped
The belief must be bonafide, even if it turns out to be incorrect

What the AO must demonstrate:

He has reason to believe that income has escaped assessment
The belief is based on some material (documentary evidence, information from search, survey, etc.)
The material is tangible and specific, not vague or general

Example — Application of Section 148:

AY 2025-26: Return filed on 28th July 2025 showing income of ₹8 lakhs.
Assessment completed under Section 143(3) on 15th March 2026.

On 10th January 2028, the AO receives information that the assessee 
had a fixed deposit interest income of ₹2 lakhs that was not disclosed 
in the return.

Can the AO issue notice under Section 148 for AY 2025-26?

Analysis:
- AY 2025-26 ends on 31st March 2026.
- 4 years from AY end = 31st March 2030.
- Since notice is being considered in January 2028 (within 4 years), 
  the AO CAN issue notice.
- However, the AO must have reason to believe that income escaped 
  assessment — the information about undisclosed interest income 
  provides that reason.
- The escaped income is ₹2 lakhs (> ₹1 lakh threshold).

⚡ Exam Tip: The assessee has the right to challenge the notice under Section 148 by filing a Writ Petition in the High Court if the notice is without jurisdiction or the AO’s reasons are not “reason to believe” but mere suspicion.

9. Commissioner Revision (Sections 263 & 264)

9.1 Section 263 — Revision of Orders Prejudicial to Revenue

🔴 High Priority — Section 263 is frequently tested in exams:

Section 263 of the Income Tax Act, 1961 empowers the Commissioner to revise orders passed by the Assessing Officer (or other subordinate authorities) if:

The order is erroneous; AND
It is prejudicial to the interests of the revenue

Key Conditions for Section 263 Revision:

Prima facie, the order must be erroneous: The Commissioner must form an opinion that the AO’s order is wrong — this could be a legal error or a factual error.
Prejudicial to revenue: The error must have resulted in loss of tax to the revenue (either underpayment of tax or excess refund).
No limitation on quantum: Even a small error can be revised; there is no minimum threshold.
Order passed by AO: The order must be a passed by a subordinate authority (not by CIT himself or ITAT).

What CAN be revised under Section 263:

Any order passed by the AO under the Act
Including assessment orders, penalty orders, refund orders
Even if the return was processed under Section 143(1)

What CANNOT be revised under Section 263:

An order that has been the subject of appeal before the CIT(Appeals) or ITAT (unless the appellate order is also prejudicial)
An order that is the subject of a revision petition under Section 264
An order that is pending appeal — the Commissioner should not preempt the appellate remedy

Procedure under Section 263:

The Commissioner forms an opinion that the order is erroneous and prejudicial.
A show cause notice is issued to the assessee stating why the order should not be revised.
The assessee is given an opportunity to be heard.
After hearing, the Commissioner passes a revision order.
The revision can:
- Enhance the assessment; OR
- Reduce the assessment (if it’s in favor of revenue, i.e., excess refund); OR
- Cancel the assessment and direct the AO to make a fresh assessment

Time Limit for Section 263 Revision:

Must be passed within 2 years from the end of the financial year in which the original order was passed.

Example — Application of Section 263:

Facts: AO passed an assessment order under Section 143(3) on 15th March 2024 
for AY 2023-24, computing total income as ₹10 lakhs and tax liability as ₹1.25 lakhs.

However, the AO failed to add the long-term capital gains of ₹2 lakhs that were 
disclosed in the return but inadvertently omitted from the assessment order.

The Commissioner, on review of the order, finds this error.

Analysis:
1. The order is ERRONEOUS — the capital gains of ₹2 lakhs were not included.
2. It is PREJUDICIAL to revenue — tax of approximately ₹20,000 (plus cess) was undercharged.
3. The Commissioner can revise this order under Section 263.

The Commissioner will:
- Issue a show cause notice to the assessee
- Give opportunity for hearing
- Enhance the assessment by adding the ₹2 lakhs of capital gains
- Demand additional tax with interest

⚡ Exam Tip: Section 263 has two essential ingredients: (1) Erroneous and (2) Prejudicial to revenue. If either element is missing, the Commissioner cannot revise. For example, if the order is erroneous but in favor of revenue (excess refund), Section 263 can still be invoked.

9.2 Section 264 — Revision of Other Orders

Section 264 of the Income Tax Act, 1961 provides the Commissioner with the power to revise any order (not just those passed by the AO) that is not covered by Section 263 or where the revision is not prejudicial to the revenue.

Key Features of Section 264:

Wide scope: Covers orders passed by various authorities under the Act, including:
- Orders passed by AO
- Orders regarding collection and recovery of tax
- TDS orders
- Penalty orders (in certain cases)
Not prejudicial to revenue: The revision under Section 264 is generally in favor of the assessee (reducing tax, granting relief), though the Commissioner can also revise against the assessee if he chooses.
No time limit as such, but there is a limitation period:
- The application for revision must be made within 1 year from the date of the order; OR
- The Commissioner can initiate revision suo motu within 1 year from the date of the order
Exclusions: Section 264 cannot be invoked for:
- Orders passed by the Commissioner himself (can’t revise own order)
- Orders that have been the subject of appeal under Section 246 to 246A (before CIT Appeals) or Section 253 (ITAT)
- Orders under Section 263 (which is a separate provision)

Distinction between Section 263 and Section 264:

Aspect	Section 263	Section 264
Revision initiated by	Commissioner suo motu	Commissioner or assessee (application)
Condition	Erroneous and prejudicial to revenue	No such restriction
Benefit/Risk	Generally against assessee (enhances tax)	Can be for or against assessee
Appeal pending	Cannot revise if appeal is pending on same issue	Can revise even if appeal pending
Time limit	2 years from FY in which order passed	1 year from date of order

⚡ Exam Tip: Remember that Section 264 is a protective provision for assessees — the assessee can file an application for revision if they believe an order is wrong and prejudicial to them. The Commissioner can then revise the order in favor of the assessee.

10. Penalties for Default

10.1 Overview of Penalties

The Income Tax Act provides for various penalties for different types of defaults. These penalties serve as deterrents against non-compliance and aim to ensure voluntary compliance by taxpayers.

Table — Penalty Provisions

Section	Default	Penalty
Section 270A	Concealment of income or furnishing inaccurate particulars	50% to 200% of tax sought to be evaded
Section 271(1)(b)	Failure to comply with notice under Section 142(1)	Up to ₹10,000 for each such failure
Section 271(1)(c)	Failure to keep books of accounts	Up to ₹10,000
Section 271A	Failure to retain books/documents	₹10,000
Section 271B	Failure to get accounts audited	0.5% of turnover/gross receipts, max ₹1.5 lakh
Section 271C	Failure to deduct TDS or pay TDS	100% of amount not deducted/paid
Section 272A	Failure to furnish TDS/TCS statement	₹200 per day of default
Section 234E	Late filing of TDS return	₹200 per day (max = TDS amount)

10.2 Section 270A — Penalty for Concealment

🔴 High Priority — This is one of the most important penalty provisions:

Section 270A of the Income Tax Act, 1961 was introduced by the Finance Act, 2016, replacing the old Section 271(1)(c) penalty for concealment.

Penalty under Section 270A is leviable if:

The assessee conceals his income; OR
The assessee furnishes inaccurate particulars of his income

Meaning of Concealment:

Deliberately not reporting income
Showing expenses or deductions that are not真实 (not genuine)
Claiming exemption under false pretenses
Showing lower income than actually earned

Meaning of Furnishing Inaccurate Particulars:

Incorrect details in the return
Misreporting income under a wrong head
Claiming deductions not admissible
Overstating deductions

Penalty Rates under Section 270A:

Situation	Minimum Penalty	Maximum Penalty
Normal cases	50% of tax sought to be evaded	100% of tax sought to be evaded
Aggravated cases (where income concealed is more than ₹25 lakhs)	75% of tax sought to be evaded	200% of tax sought to be evaded

Tax Sought to Be Evaded means:

Tax on (Income returned − Income previously assessed) 
OR
Tax on Income that should have been declared but was not

Important — Section 270A(8): No penalty if:

The assessee voluntarily discloses the income before detection by the AO
The disclosure is made in the return itself
The tax and interest on such income is paid before the expiry of the due date of filing return

⚡ Exam Tip: Section 270A penalty is NOT automatic — it requires the AO to prove concealment or furnishing of inaccurate particulars. The burden of proof is on the department. The penalty is calculated on the tax sought to be evaded, not on the total tax liability.

10.3 Section 271 — Default in Furnishing Return

Section 271(1)(b) provides for penalty if the assessee fails to comply with a notice issued under Section 142(1) requiring the filing of a return of income or production of accounts and documents.

Penalty under Section 271(1)(b):

Minimum: ₹10,000
The AO can impose a higher penalty depending on the nature and duration of default

Section 271(1)(c) covers penalty for:

Failure to keep, preserve, and produce books of accounts as required
Penalty: Up to ₹25,000 (extendable in certain cases)

10.4 Section 234E — Late Filing of TDS Return

🔴 High Priority — This is a strictly enforced provision for deductor compliance:

Section 234E of the Income Tax Act, 1961 provides for levy of fee for late filing of TDS (Tax Deducted at Source) returns/statements.

Key Features:

Who is liable: Every person responsible for deducting tax (deductor) who fails to file the TDS statement (Form 24Q, 26Q, 27Q, 27EQ) within the due date.
Fee/Charge:
- ₹200 per day until the return is filed
- Maximum fee: The fee cannot exceed the amount of TDS for the period
No fee if: The TDS statement is filed but there is no TDS deducted (nil statement)
Due dates for TDS Returns (Quarterly):
- Q1 (Apr-Jun): Due by 31st July
- Q2 (Jul-Sep): Due by 31st October
- Q3 (Oct-Dec): Due by 31st January
- Q4 (Jan-Mar): Due by 31st May

Example — Section 234E Calculation:

Scenario: ABC Ltd has TDS of ₹5,00,000 for Q1 FY 2024-25.
They file the TDS return on 20th November 2024 (instead of 31st July 2024).

Delay calculation:
From 1st August 2024 to 20th November 2024 = approximately 112 days

Fee under Section 234E:
= ₹200 × number of days of delay
= ₹200 × 112
= ₹22,400

Maximum fee = TDS amount = ₹5,00,000 (since ₹22,400 < ₹5,00,000)
Fee Payable = ₹22,400

⚡ Exam Tip: Section 234E fee is calculated per day of delay. Unlike penalties, it is not discretionary — it is automatic and mandatory once the return is filed late.

10.5 Section 234F — Late Filing of Tax Audit Report

Section 234F of the Income Tax Act, 1961 provides for a fee for late filing of tax audit report (Form 3CA or 3CB) and the audit report for international transactions (Form 3CE).

Applicability:

Applies when an assessee is required to get his accounts audited under Section 44AB (tax audit)
The tax audit report and return of income must be filed within the due date

Fees under Section 234F:

Situation	Fee
Return filed within 30 days of due date	₹5,000
Return filed after 30 days but within the end of relevant assessment year	₹10,000
If total income exceeds ₹5 lakhs and return filed after due date	₹10,000
If total income does not exceed ₹5 lakhs	₹1,000

Note: The fees under Section 2 (for income ≤ ₹5 lakhs) shall not exceed ₹1,000. For others, it shall not exceed ₹10,000.

⚡ Exam Tip: Section 234F is not a penalty — it is a fee. It is computed based on the delay in filing and the income level. It is in addition to any interest liability.

10.6 Section 276B — Prosecution for Default in TDS Payment

Section 276B of the Income Tax Act, 1961 deals with criminal prosecution for willful failure to pay TDS to the government.

Offence under Section 276B:

The deductor (person responsible for deducting tax) deducts tax at source
But fails to pay the TDS to the government
The failure is willful

Punishment under Section 276B:

Imprisonment: Not less than 3 months
But may extend to 7 years
Fine: In addition to imprisonment

Conditions for Prosecution:

Tax must have been deducted (actual deduction by the payer)
The deducted tax was not paid to the government
The failure was willful (not accidental)
The amount of TDS involved must be above a certain threshold

Compoundable Offence: Section 276B is a compoundable offence under the Income Tax Act — the assessee can settle the matter by paying the tax, interest, and a compounding fee.

⚡ Exam Tip: Section 276B prosecution is the most serious consequence of TDS default. Mere late filing of TDS return leads to Section 234E fee, but failure to deposit TDS can lead to criminal prosecution. In exam questions, always distinguish between the consequences of (a) failure to deduct TDS, (b) failure to file TDS return, and (c) failure to pay TDS.

11. Summary of Key Provisions

Key Concepts and Their References:

Topic	Key Section	Important Point
Advance Tax Payment	Section 211	15%/30%/45%/60% cumulative by June/Sept/Dec/Mar
Advance Tax Shortfall	Section 234B	1% per month on shortfall if < 90% of assessed tax
Self-Assessment Tax	Section 140A	Pay before filing return
Return Due Dates	Section 139	Sep 30 (Company), Oct 31 (Tax Audit), Jul 31 (Others)
Belated Return	Section 139(5)	Additional fee ₹1,000/₹5,000; no loss carry forward
Revised Return	Section 139(9)	Within 4 years of AY or before assessment, whichever earlier
TDS Matching	Section 200A	TAN-based computerized matching
Refund Interest	Section 244A	0.5% per month or part
Summary Assessment	Section 143(1)	No inquiry; 9 months time limit
Scrutiny Assessment	Section 143(3)	With inquiry; notice under 143(2) within 3 months
Best Judgment	Section 144	When assessee fails to comply
Reassessment	Section 147	4 years; reason to believe income escaped
Reassessment Notice	Section 148	Must be within 4 years (or 6 years if escape ≥ ₹1 lakh)
Commissioner Revision	Section 263	Erroneous and prejudicial to revenue
Commissioner Revision	Section 264	Other orders; can be by assessee application
Concealment Penalty	Section 270A	50%–200% of tax evaded
TDS Late Return Fee	Section 234E	₹200 per day (max = TDS amount)
Tax Audit Late Fee	Section 234F	₹5,000/₹10,000/₹1,000 based on income
TDS Prosecution	Section 276B	3 months to 7 years imprisonment

12. Practice Questions

Compute advance tax liability: Mr. X has estimated total income of ₹15 lakhs for FY 2024-25. TDS deducted is ₹1,20,000. Compute advance tax installments payable and explain the consequences if he pays only the first installment.
Belated vs Revised Return: Distinguish between a belated return under Section 139(5) and a revised return under Section 139(9). What are the consequences of filing a belated return?
Section 244A Interest: A refund of ₹80,000 is due to Ms. K for AY 2025-26. The refund was issued on 10th November 2025, but the return was filed on 30th July 2025 (within time). Calculate the interest on refund.
Section 147 Reassessment: Discuss the circumstances under which the Assessing Officer can issue a notice under Section 148 for reassessment. What is the time limit for issuing such notice?
Section 263 vs 264: Distinguish between revision under Section 263 and Section 264. Can the Commissioner revise an order that is pending appeal?
Section 270A Penalty: Explain the penalty for concealment of income under Section 270A. When is the penalty not leviable?
Section 234E TDS Fee: Compute the late filing fee under Section 234E if a deductor files the Q2 TDS return on 15th January 2025 instead of the due date of 31st October 2024. TDS for the quarter is ₹3,50,000.
Section 276B Prosecution: Under what circumstances can prosecution be initiated under Section 276B? What is the punishment?

🔴 Extended — Deep Study (3mo+)

Comprehensive coverage for students on a longer study timeline.

13. Detailed Analysis of Assessment Procedures

13.1 Section 143(1) — Summary Assessment In-Depth

Section 143(1) provides for a completely automated assessment process. The key aspects are:

Step-by-Step Process under Section 143(1):

Return Filed: The assessee files the return in prescribed form and verified in prescribed manner.
Receipt of Return: The Central Processing Centre (CPC) at Bengaluru processes the return electronically.
Processing Actions:
- Computation of income under each head
- Application of deductions under Chapter VI-A
- Set-off of losses (brought forward and current year)
- Verification of TDS credits with Form 16/16A/26AS
- Verification of TCS credits
- Computation of tax liability
- Determination of refund or demand
Communication: An intimation is sent to the assessee (either refund intimation or demand notice) at the address provided.

Key Points to Remember:

Section 143(1) is a no-touch assessment — the CPC does not call for any documents or explanations.
The time limit of 9 months from the end of the month in which return is filed is important.
If the CPC finds any discrepancy, it can intimate the assessee but cannot directly amend the return.
However, if income has been under-reported, the case may be taken up for scrutiny under Section 143(2).

Example — Section 143(1) Processing:

Return filed on 28th July 2024 (AY 2025-26):
- Return processed on 15th December 2024 (within 9 months)
- Total income declared: ₹8,50,000
- TDS credit verified: ₹65,000
- Advance tax paid: ₹15,000
- Self-assessment tax paid with return: ₹12,500

Tax calculation:
On ₹8,50,000 (New Regime):
Up to ₹3,00,000 = NIL
₹3,00,001 to ₹7,00,000 = ₹4,00,000 × 5% = ₹20,000
₹7,00,001 to ₹8,50,000 = ₹1,50,000 × 10% = ₹15,000
Total = ₹35,000
Cess @ 4% = ₹1,400
Total tax = ₹36,400

TDS + Advance + SAT = 65,000 + 15,000 + 12,500 = ₹92,500
Excess = 92,500 − 36,400 = ₹56,100

Refund issued automatically under Section 143(1).

13.2 Section 143(3) — Scrutiny Assessment Detailed Procedure

Scrutiny assessment is the most detailed form of assessment and involves comprehensive inquiry into the return.

13.2.1 Types of Scrutiny

Regular Scrutiny: Full-scale inquiry into all aspects of the return.
Limited Scrutiny: AO focuses on specific issues/areas identified in the return.
Complete Scrutiny: All issues are examined in detail.

13.2.2 Notice under Section 143(2)

Must be served within 3 months from the end of the month in which return was filed.
The notice must specify the issues in respect of which the assessee is required to furnish information.
It is a jurisdictional requirement — failure to serve this notice within time makes the assessment void.

13.2.3 Powers of AO during Scrutiny

Under Section 142(2) and (3):

Production of Books: The AO can require the assessee to produce books of accounts, documents, and other evidence.
Special Audit (Section 142(2A)): If the AO is unable to form an opinion on the correctness of the accounts, he can direct the assessee to get the accounts audited by a specified chartered accountant.
- The CA is appointed by the Chief Commissioner or Commissioner.
- The fee is fixed by the AO and paid by the government.
Expert Assistance: The AO can seek expert opinion on technical matters (e.g., valuation of property, etc.).

13.2.4 Time Limits for Scrutiny Assessment

For AY 2024-25 onwards:

Assessment must be completed within 12 months from the end of the month in which the return was filed.
Earlier, the time limit was 21 months (extended for certain years).

Example — Timeline for Scrutiny:

Return filed: 28th July 2024
End of month of filing: July 2024

Notice under Section 143(2) must be served by:
31st October 2024 (within 3 months from end of July 2024)

Assessment must be completed by:
31st July 2025 (within 12 months from end of July 2024)

13.3 Section 144 — Best Judgment Assessment

Section 144 is invoked when:

Assessee fails to file return: Even after notice under Section 148 (for reassessment) or Section 142(1) (for original assessment), the assessee does not file the return.
Assessee fails to comply: Even after repeated notices, the assessee does not produce books of accounts or does not appear before the AO.
Return is defective: The assessee files a defective return and does not correct it within the time allowed.
AO not satisfied: Even after inquiry and hearing, the AO is not satisfied with the return filed.

The Best Judgment Process:

Step 1: Serve notice under Section 142(1) — requiring production of accounts
Step 2: If assessee fails to comply, serve another notice specifying consequences
Step 3: Issue show cause notice under Section 144 — why best judgment should not be made
Step 4: Make assessment to the BEST OF JUDGMENT
        (Based on: previous year income, current year investments, bank balances, 
         lifestyle indicators, etc.)
Step 5: Issue assessment order with demand notice
Step 6: Levy interest under Section 234B (if advance tax shortfall)
Step 7: Consider penalty provisions (concealment penalty if applicable)

⚡ Exam Tip: Best judgment does not mean arbitrary judgment. The AO must have some material basis for estimating income. The assessee can appeal against the assessment order if the income estimated is unreasonable.

13.4 Section 147 — Reassessment Detailed Analysis

13.4.1 Evolution and Current Position

The reassessment provisions underwent a major change after the Supreme Court’s decision in the case of GVK Industries vs. ITO (2011), which held that the AO must have tangible material to believe that income has escaped assessment. Mere change of opinion is not sufficient.

Post the Finance Act, 2021, the provisions have been further modified to simplify the reassessment process.

13.4.2 Conditions for Reassessment

For the AO to validly invoke Section 147:

There must be information: The AO must have information that income has escaped assessment.
Reason to believe: The AO must have reason to believe (not mere suspicion) that income has escaped.
The belief must be bona fide: Even if the belief turns out to be wrong later, the reassessment is valid if the belief was bona fide.
Notice must be valid: The notice under Section 148 must be properly served.

13.4.3 Information that Can Trigger Reassessment

The following are typical sources of information:

Search and Seizure (Section 132): Documents/books seized during search reveal undisclosed income.
Survey (Section 133A): Statements recorded during survey reveal income not disclosed.
Intelligence Reports: Information from the Investigation Wing about undisclosed transactions.
Analysis of Form 26AS: Discrepancies between TDS claimed and actual TDS deducted.
Information from Other Government Departments: Eg., from GST authorities, RBI, Stock exchanges.
Foreign Account Tax Compliance Act (FATCA) data: Information about foreign accounts.
Common Reporting Standard (CRS) data: Information about foreign financial accounts.

13.4.4 What Constitutes “Escape of Income”?

Income is said to escape assessment when:

No return was filed and no assessment was made.
A return was filed but the income was underreported (not disclosed fully).
A return was filed and assessment was made, but certain income was left out.
The assessee claimed exemptions/deductions not admissible.
Loss was computed incorrectly.
Income from new sources was not declared.

13.4.5 Time Limits for Reassessment — Detailed

Category	Time Limit	Condition
Standard cases	4 years from end of AY	Any escapement
Beyond 4 years	6 years from end of AY	Only if escaped income ≥ ₹1 lakh AND omission/failure to disclose
Beyond 4 years (fraud cases)	16 years from end of AY	Only if assessment was made under Section 143(3) and escapement is due to fraud

13.4.6 Procedure after Notice under Section 148

Assessee files Return: The assessee must file a return within the time specified in the notice (usually 30 days).
AO Processes Return: The return filed in response to Section 148 notice is processed.
Inquiry: The AO may conduct further inquiry if necessary.
Assessment Order: The AO passes the reassessment order.
Demand Notice: If additional tax is found due, a demand notice is issued.
Interest: Interest under Section 234B and Section 234C is charged on the additional tax.

⚡ Exam Tip: Once a notice under Section 148 is issued, the assessee cannot withdraw the return. The assessee must either file a return showing the escaped income or appear before the AO and explain why no income has escaped.

13.5 Section 263 — Detailed Analysis

13.5.1 “Erroneous” Order

An order is erroneous if:

It is legally incorrect (e.g., wrong section applied, wrong calculation)
It is factually incorrect (e.g., income computed wrongly, expenses allowed incorrectly)
The AO has failed to consider material evidence
The AO has considered immaterial evidence

The error must be apparent on the face of the record — the Commissioner cannot reappreciate evidence that was already before the AO.

13.5.2 “Prejudicial to Interests of Revenue”

An order is prejudicial to revenue if:

It results in underpayment of tax
It results in excess refund
It results in wrong carry forward of losses
It results in wrong allowance of credit

The test is objective — would a correct order have resulted in more tax being paid?

13.5.3 Powers of Commissioner under Section 263

The Commissioner can:

Enhance the assessment: If the original assessment was too low, the Commissioner can increase it.
Cancel and refer back: Cancel the assessment and direct the AO to make a fresh assessment.
Modify the order: Make necessary modifications.

13.5.4 Limitations on Section 263

No revision if order is subject of appeal: The Commissioner cannot revise an order if the same matter is pending before the CIT(Appeals) or ITAT.
One revision limit: The Commissioner cannot revise the same order multiple times.
Time limit: Must be passed within 2 years from the end of the FY in which the original order was passed.
No self-revision: The Commissioner cannot revise his own orders.

⚡ Exam Tip: The Commissioner CANNOT initiate revision merely because he has a “different opinion” on the facts. There must be a clear error that is apparent. The Supreme Court has held that the Commissioner’s power under Section 263 is supervisory, not appellate.

13.6 Section 264 — Detailed Analysis

13.6.1 Orders Revisable under Section 264

Section 264 covers a wide range of orders, including:

Orders passed by AO under various sections
Orders regarding collection and recovery of tax
TDS orders
Refund orders
Penalty orders (not covered by Section 263)
rectification orders

13.6.2 Two Types of Revision under Section 264

Suo Motu Revision: The Commissioner can initiate revision on his own motion.
Revision on Application: The assessee can file an application for revision if:
- The order is prejudicial to the assessee; OR
- The order is erroneous in law or fact

Application for Revision:

Must be made within 1 year from the date of the order.
The Commissioner may admit a late application if there is sufficient cause.
The Commissioner can call for all documents and records from the AO.

13.6.3 Powers of Commissioner under Section 264

The Commissioner can:

Reverse the order: If the order is wrong, he can set it aside.
Modify the order: Change any finding or conclusion.
Refer the matter back: Direct the AO to redo the order.
Reject the application: If no error is found.

⚡ Exam Tip: Unlike Section 263, Section 264 revision is generally in favor of the assessee. The assessee uses Section 264 as a remedy when other remedies (appeal to CIT(Appeals)) have not been used or are not available.

14. TDS Provisions — Detailed Analysis

14.1 TDS Mechanism

Tax Deducted at Source (TDS) is a system where the payer of income deducts tax at a prescribed rate before making payment to the recipient. This system serves two purposes:

Tax collection at source: Ensures that tax is collected as and when income is earned.
Prevention of tax evasion: Reduces the possibility of unreported income.

Key TDS Sections:

Section	Nature of Payment	Threshold (₹)	Rate (%)
192	Salary	As per slab	As per slab
193	Dividends	5,000	10
194	Deemed dividends	—	10
194A	Interest	50,000 (SB) / 40,000 (others)	10
194B	Lottery/Crossword	10,000	30
194C	Contractor/Sub-contractor	30,000 single / 1,00,000 aggregate	1/2
194D	Insurance commission	20,000	10
194H	Commission/Brokerage	15,000	5
194I	Rent (Land/Building)	2,40,000	10
194I	Rent (Machinery/Equipment)	—	2
194J	Professional/Technical	30,000	10/2
194C	TDS on fees to contractors	—	10

14.2 TDS Returns and Statements

TDS Returns (Quarterly Statements):

Form	Description	Due Date
Form 24Q	TDS from Salary	31st July / 31st Oct / 31st Jan / 31st May
Form 26Q	TDS from Non-Salary	Same as above
Form 27Q	TDS from NRI/Foreign company	Same as above
Form 27EQ	TCS Returns	Same as above

14.3 Section 234E — Detailed Calculation

Section 234E provides for fee for late filing of TDS statements. The fee is:

₹200 per day of default
OR
Total TDS amount for the period
(whichever is lower)

Key Points:

The fee is computed from the due date of filing until the actual date of filing.
There is no upper limit except that it cannot exceed the TDS amount.
If the TDS statement is not filed at all, the fee continues to accrue.

Example — Section 234E Calculation (Multiple Quarters):

Q1 TDS return due: 31st July 2024
Filed on: 15th September 2024
Delay: 46 days (August + 15 days of September)

Fee = 200 × 46 = ₹9,200

But TDS for Q1 = ₹2,00,000
Since 9,200 < 2,00,000, fee = ₹9,200

Total TDS for year = ₹8,00,000
Max fee = ₹8,00,000

Even if the return is filed very late, the fee will be capped at ₹8,00,000.

⚡ Exam Tip: The fee under Section 234E is payable even if there is no TDS deducted for a particular quarter (nil return). However, if the delay is very short (e.g., 1-2 days), the fee will be minimal (₹200-400).

14.4 Section 276B — Criminal Prosecution for TDS Default

Section 276B is a serious provision that criminalizes the failure to pay TDS.

Essential Ingredients:

The accused must be a person responsible for deducting tax (i.e., the deductor — employer, payer, etc.)
The accused must have deducted tax at source
The deducted tax must have been credited to the government (or should have been credited)
The failure to pay must be willful

Punishment:

Imprisonment: Not less than 3 months, extending up to 7 years
Fine: In addition to imprisonment

Compoundability:

Section 276B is a compoundable offence
The assessee can approach the authorities for compounding
Compounding involves paying the TDS amount with interest and a compounding fee

Distinction between Section 276B and Section 271C:

Section 276B	Section 271C
Criminal prosecution	Civil penalty
Imprisonment + Fine	100% of amount not deducted/paid
Requires willful failure	No mens rea (intent) required
Compoundable	Not compoundable

⚡ Exam Tip: In exams, when asked about consequences of TDS default, always mention both civil (Section 234E fee, Section 271C penalty) and criminal (Section 276B prosecution) consequences.

15. Income Tax Assessment — Comprehensive Flowchart

RETURN FILED
    ↓
Is Return Filed on Time? → NO → Belated Return (Section 139(5))
    ↓                              - Additional Fee
YES                               - No Loss Carry Forward
    ↓                               - Delayed Refund Interest
RETURN PROCESSED (Section 143(1))
    ↓
Any Discrepancy Found? → YES → Scrutiny Assessment (Section 143(3))
    ↓ NO                           - Notice under 143(2)
RETURN ACCEPTED                     - Inquiry
    ↓                             - Time Limit: 12 months
Tax Computed
    ↓
Tax Paid = Return Tax? → YES → Refund Issued (Section 244A Interest)
    ↓ NO
    ↓
Additional Tax Due
    ↓
Is Assessee Cooperative? → NO → Best Judgment (Section 144)
    ↓ YES
    ↓
Assessment Completed
    ↓
Is Assessment Valid? → NO → Revision (Section 263/264)
    ↓ YES
    ↓
Is Income Escaped? → YES → Reassessment (Section 147)
    ↓ NO        ↓
    Issue Notice (Section 148)
    File Return in Response
    Assessment Made

16. Advance Tax — Comprehensive Examples

Example 1: Individual with Salary and Business Income

Mr. Raghav (Age 45) — FY 2024-25

Salary Income: ₹8,00,000 (after standard deduction)
Business Income: ₹4,00,000
Deductions (Chapter VI-A): ₹1,50,000
TDS from Salary: ₹62,000
Advance Tax Paid in installments: ₹20,000

Solution:

Step 1: Compute Total Income
Salary: ₹8,00,000
Business Income: ₹4,00,000
Gross Total Income: ₹12,00,000
Less: Deductions: ₹1,50,000
Total Income: ₹10,50,000

Step 2: Compute Tax (New Regime)
Up to ₹3,00,000: NIL
₹3,00,001 to ₹7,00,000: ₹4,00,000 × 5% = ₹20,000
₹7,00,001 to ₹10,50,000: ₹3,50,000 × 15% = ₹52,500
Total: ₹72,500
Cess @ 4%: ₹2,900
Total Tax Liability: ₹75,400

Step 3: TDS: ₹62,000
Step 4: Advance Tax Paid: ₹20,000
Step 5: Balance Tax = 75,400 − 62,000 − 20,000 = NIL (actually excess paid)

Actually:

Tax Liability: ₹75,400
TDS + Advance: 62,000 + 20,000 = ₹82,000
Excess: 82,000 − 75,400 = ₹6,600 (refund)

No advance tax was required since balance was only ₹13,400 (which is > ₹10,000 
but advance tax of ₹20,000 was already paid).

Example 2: Advance Tax Shortfall and Interest under Section 234B

Ms. Shalini (Age 35) — FY 2024-25

Total Income: ₹15,00,000
Tax Liability: ₹1,32,600 (approx)
TDS: ₹95,000
Advance Tax Paid (only first installment): ₹2,000
Balance tax after TDS: ₹37,600
Required Advance Tax (60% by March): ₹22,560
Actually Paid: ₹2,000

Solution:

Shortfall in Advance Tax:
Required Advance Tax (60% of 37,600) = ₹22,560
Actually Paid = ₹2,000
Shortfall = ₹20,560

Since Advance Tax Paid < 90% of Assessed Tax:
Assessed Tax = Balance Tax = ₹37,600
90% of 37,600 = ₹33,840
Advance Tax Paid = ₹2,000
Shortfall = ₹33,840 − 2,000 = ₹31,840

Interest under Section 234B:
= 1% per month on shortfall
= 1% × ₹31,840 = ₹318.40 per month

⚡ Exam Tip: Always compute 90% threshold first before applying Section 234B. If advance tax paid is even ₹1 short of 90%, interest is attracted on the entire shortfall from the due dates.

17. TDS Matching — Section 200A Process

TDS DEDUCTED BY PAYER
        ↓
DEDUCTOR FILES TDS RETURN (Quarterly)
        ↓
FORM 26AS UPDATED (TAN-wise)
        ↓
RETURN PROCESSED UNDER SECTION 200A
        ↓
MATCHING AGAINST:
- PAN of deductee
- TDS amount deposited
- TDS rate applied
- TDS certificate issued
        ↓
TDS CREDIT GIVEN TO DEDUCTEE
        ↓
IF MISMATCH:
- TDS credit not given / reduced
- Discrepancy intimation sent
- Deductor can file correction statement

18. Refund Processing — Detailed Timeline

Section 244A Interest Calculation — Complete Process:

Date of Filing Return: 28th July 2025 (AY 2025-26)
Date of Processing: 15th December 2025
Date of Refund Issue: 10th February 2026

Refund Amount: ₹45,000

Interest Period:
From: 28th July 2025 (date of filing)
To: 10th February 2026 (date of refund)

July 2025: Part month from 28th = 1 month
August 2025: 1 month
September 2025: 1 month
October 2025: 1 month
November 2025: 1 month
December 2025: 1 month
January 2026: 1 month
February 2026: Part month up to 10th = 1 month

Total: 8 months

Interest = 45,000 × 0.5% × 8 = ₹1,800

Total Refund = 45,000 + 1,800 = ₹46,800

⚡ Exam Tip: If the return was filed BELATED, interest under Section 244A starts from the date of filing the belated return, NOT from the original due date. This is a key distinction.

19. Key Amendments and Updates for FY 2024-25

19.1 Changes in Advance Tax

The installment percentages and due dates remain unchanged for FY 2024-25.
However, the government has been encouraging digital payment of advance tax through the e-pay tax facility.
For capital gains income, advance tax must be paid in the installment due on or before 15th March (the last installment) — capital gains income can be estimated and advance tax paid accordingly.

19.2 Changes in Return Filing

Updated Return (Section 139(8A)): A new provision allows filing of an updated return — this is different from a revised return. An updated return can be filed within 2 years from the end of the relevant AY on payment of additional fee of 25% (if loss) or 50% (if additional tax liability) of the tax and interest due.

19.3 TDS Changes

TDS thresholds have been increased for certain sections (e.g., Section 194A — interest income threshold increased to ₹50,000 for senior citizens).
New sections for tax on online gaming (Section 194BA) have been introduced.
TDS on cryptocurrency transactions (Section 194S) — transactions in virtual digital assets are now subject to TDS.

19.4 Refund Changes

Refunds are being processed faster — the CPC aims to process refunds within 2-3 weeks for simple cases.
Refunds are credited directly to bank accounts via ECS/RTGS/NEFT.

20. Exam Strategy and Tips

20.1 Most Likely Exam Questions

Based on analysis of previous CS Executive examinations, the following topics are most frequently tested:

Advance Tax Computation (very high probability)
- Calculate advance tax installments
- Determine shortfall and interest under Section 234B
Self-Assessment Tax Computation (very high probability)
- Compute balance tax after TDS and advance tax
- Payment procedure
Due Dates and Return Types (high probability)
- Match assessee type with due date
- Belated vs Revised return consequences
Section 244A Interest Calculation (high probability)
- Calculate interest on refund
- Determine whether refund is with or without interest
Section 147 Reassessment (medium-high probability)
- Time limits
- Notice under Section 148
- Conditions for reassessment
Section 270A Penalty (medium probability)
- Concealment vs inaccurate particulars
- Penalty rates

20.2 Common Mistakes to Avoid

Advance Tax Installments: Remember the percentages are cumulative, not separate.
Belated Return: Loss carry forward is LOST — this is the biggest consequence.
Section 244A: Always calculate from the date of filing (or date of excess payment), not from the due date.
Section 148: Time limit is from the end of the AY, not from the date of the assessment order.
Section 263: Two conditions — erroneous AND prejudicial to revenue.
Section 234E: Fee is per day, max = TDS amount.
Section 140A: Payment must be before or with the return.

20.3 Answer Writing Strategy

For CS Executive exams:

Always mention the Section number — e.g., “Under Section 140A…”
Explain the concept briefly before solving the numerical part.
Use proper format — Step-by-step calculation.
Write the conclusion clearly — e.g., “Advance tax installment of ₹X is payable by [date].”
Mention consequences where relevant — e.g., “If not paid, interest under Section 234B will apply.”

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