Income Tax Reassessment in India: Section 147, 148A and 148 Notices Explained

An email from the Income Tax Department mentioning Section 148A or Section 148 is unsettling, especially when it concerns a year you thought was closed. These notices start an income tax reassessment: the Assessing Officer believes some of your income for that year "escaped assessment" and wants to examine it again.

A reassessment notice is not a penalty and not proof of wrongdoing. But it has strict deadlines, and missing them can lead to an ex-parte order you will struggle to undo. This guide explains how the process works, the time limits the Department must follow, and how to respond.

Quick answer: Income tax reassessment under Section 147 allows the Assessing Officer to reopen a past year if income has escaped assessment. Before issuing a Section 148 notice, the officer must first issue a show-cause notice under Section 148A, give you 7 to 30 days to reply, and pass an order. For notices issued from 1 September 2024, reassessment is generally allowed up to 3 years from the end of the assessment year, extended to 5 years only if the escaped income is ₹50 lakh or more.

Note on the new law: The Income-tax Act, 2025 replaced the 1961 Act from 1 April 2026 and renumbers the reassessment provisions. Reassessment of years governed by the 1961 Act continues under the old provisions described here, subject to the transition rules. If your notice cites sections of the 2025 Act, ask your tax advisor to map them before replying.

What Is Section 147 of the Income Tax Act?

Section 147 empowers the Assessing Officer (AO) to assess or reassess income that has escaped assessment for any year, subject to the procedure in Sections 148 to 153.

What counts as "income escaping assessment"

Income escapes assessment when, for example:

1. You did not file a return although your income was taxable.
2. Income was understated or not disclosed in the return.
3. A deduction, exemption or loss was wrongly allowed.
4. High-value transactions (property purchase, large cash deposits, share sales) appear in the Department's data but are missing from your return.

What triggers a reassessment

The AO must have "information which suggests that income has escaped assessment." By law, this includes:

1. Information flagged under the CBDT's risk management strategy (such as mismatches between AIS/26AS and your ITR).
2. A final audit objection by the Comptroller and Auditor General.
3. Information received under a tax treaty from another country.
4. Information from a survey, or from search and seizure proceedings in certain cases.

A mere change of opinion by a new officer is not, on its own, valid grounds for reopening.

Time Limit for Reassessment

The Finance (No. 2) Act, 2024 simplified the time limits for notices issued on or after 1 September 2024.

The extra 3 months covers the 148A show-cause stage.

Worked example

Take AY 2022-23 (FY 2021-22), which ended on 31 March 2023.

1. Escaped income of ₹12 lakh: the 148A notice can be issued up to about 30 June 2026. After that, the year is generally closed for reassessment.
2. Escaped income of ₹75 lakh: the window extends to about 30 June 2028.

Older years: For notices issued before 1 September 2024, the earlier regime applied (3 years generally, and up to 10 years for escaped income of ₹50 lakh or more). The Supreme Court's judgment in Union of India v. Rajeev Bansal (October 2024) dealt with how notices issued during the transition must be tested. Older years are fact-specific, so take professional advice.

Section 148A Procedure: The Show-Cause Stage

Before any reassessment begins, the AO must follow the 148A procedure.

• Show-cause notice under Section 148A(1). The AO sends you the information suggesting escaped income and asks why a 148 notice should not be issued.
• Your reply. You get not less than 7 days and not more than 30 days to respond, with evidence.
• Order under Section 148A(3). The AO considers your reply and passes an order deciding whether it is a fit case for reassessment.
• Approval. The AO needs prior approval of the "specified authority" under Section 151 before passing this order and issuing the 148 notice.

The 148A stage is your best opportunity to stop the reassessment entirely. If you can show with documents that the income was already disclosed, or that the transaction belongs to someone else, the AO may drop the matter at this stage.

Section 148 Notice: What It Means

If the AO decides the case is fit for reassessment, you receive a notice under Section 148, along with the 148A(3) order.

The notice requires you to file a return of income for that year within the period specified in it, which cannot exceed three months from the end of the month in which the notice is issued.

After you file, the AO proceeds with the reassessment, usually through the faceless assessment system, by issuing further notices under Section 142(1) or 143(2).

How to Reply to a Section 148 Notice

Step 1: Read the notice and the 148A(3) order carefully

Identify the assessment year, the transaction or information flagged, and the deadline. Check the notice on the e-filing portal under Pending Actions → e-Proceedings to make sure it is genuine.

Step 2: Check whether the notice is within time

Calculate the time limit using the table above. A notice issued after the limit is invalid and can be challenged.

Step 3: Collect documents

Gather your original ITR, Form 26AS and AIS, bank statements, purchase or sale deeds, capital gains computation, and any explanation for the flagged transaction.

Step 4: File the return in response to the 148 notice

File the return within the time given, even if you believe no income escaped. You can file it under protest and request the reasons and documents relied on, if not already supplied.

Step 5: Respond to subsequent notices

Reply to every 142(1) and 143(2) notice through the e-Proceedings tab before the deadline. If you need more time, submit an adjournment request with reasons.

Step 6: Consider legal remedies

If the notice is time-barred, lacks proper approval, or is based on information that does not relate to you, a writ petition before the High Court may be considered. This is a specialised step, and you should consult a tax lawyer.

Common Mistakes Taxpayers Make

Ignoring the 148A notice. Many taxpayers wait for the "real" notice. By then, the AO has already decided the case is fit for reassessment.

Not filing the return after a 148 notice. Failure to file can lead to a best-judgement assessment and penalties.

Filing a return that differs from the original without explanation. If you file a revised figure, explain the difference clearly.

Assuming an old year is safe. Remember the 5-year window for escaped income of ₹50 lakh or more.

Practical Example

Anita, a salaried employee in Pune, sold an inherited plot in FY 2021-22 for ₹40 lakh but did not report the capital gain, assuming inherited property was tax-free. In 2025, she received a 148A show-cause notice based on the property registration data.

In her reply, she submitted the inheritance documents, the original purchase cost of her father with indexation, and a computation showing a long-term capital gain of only ₹6 lakh, offset by a Section 54F investment in a flat. The AO accepted that the tax effect was minimal but still found escaped income, issued a 148 notice, and reassessed it with the deduction allowed. Her timely reply kept the additional tax low and avoided penalty for under-reporting.

Frequently Asked Questions

1. What is the time limit for a Section 148 notice? For notices issued from 1 September 2024: 3 years (plus 3 months) from the end of the assessment year, or 5 years (plus 3 months) if escaped income is ₹50 lakh or more.

2. Is a 148A notice the same as a 148 notice? No. A 148A notice is a show-cause notice asking whether reassessment should begin. A 148 notice is issued after the AO decides reassessment is justified.

3. How many days do I get to reply to a 148A notice? Between 7 and 30 days, as specified in the notice.

4. Do I have to file a return after a Section 148 notice? Yes, within the period specified, which cannot exceed three months from the end of the month the notice was issued.

5. Can a reassessment be challenged? Yes. Notices that are time-barred, lack valid approval, or are based on irrelevant information can be challenged, including through a writ petition before the High Court.

6. What happens if I ignore a reassessment notice? The AO can complete a best-judgement assessment, raise a tax demand, and initiate penalty proceedings.

7. Does the Income-tax Act 2025 change reassessment? It renumbers the provisions from 1 April 2026. Years governed by the 1961 Act continue under the old provisions as per the transition rules.