Research & Articles

Responding to a Reassessment Notice in India: The Case Is Won at the Section 281 Show-Cause, Not the Section 280 Notice

A Practical Guide for Taxpayers Facing the Reopening of a Past Year

Authored by R & D Law Chambers LLP | Practice led by Ravish Bhatt, Dual-qualified lawyer (India and England & Wales) | Bar Council of Gujarat, Enrolment G/504/2008 | SRA (non-practising) Registration No. 492 477 | ADIT, Chartered Institute of Taxation, London

Published: 20 August 2026 | Last reviewed: 20 August 2026

This guide is written against the Income-tax Act, 2025 (Act No. 30 of 2025), whose reassessment provisions, sections 279 to 286, apply from Tax Year 2026-27. Reassessment of a year beginning before 1 April 2026 continues under the Income-tax Act, 1961 (sections 147 to 151), preserved by section 536(2)(c) of the 2025 Act. Section numbers are given in the 2025 Act, with the 1961 Act number in brackets on first mention. This note states Indian law only.

When a past year is reopened, the visible event is the section 280 notice asking you to file a return. But that notice is the second gate. The first, and decisive, gate is the section 281 show-cause that must come before it. The reply you file at that stage, tested against the whole reassessment code, is usually what determines whether the year is reopened at all.

Index of Topics

The Reassessment Code: Read Sections 279 to 286 Together
First, Decide Which Act Governs Your Notice
The Section 281 Show-Cause: What It Must Contain, and Why It Is Decisive
Drafting the Reply: Four Tests Every Reassessment Reply Should Apply
The Trigger: Information, Not a Bare Reason to Believe
Time Limits, the Fifty-Lakh Threshold, and Sanction
Service and Jurisdiction: the Procedural Grounds
After an Adverse Order: Assessment, Appeal or Writ

1. The Reassessment Code: Read Sections 279 to 286 Together

Reassessment is not governed by section 280 in isolation. Sections 279 to 286 form a single code: the power to reassess (279), the pre-notice show-cause (281), the notice (280), the time limits (282), the sanction (284) and the completion deadline (286). A reassessment survives only if every link holds. A reply that reads them together is far stronger than one that reads the notice alone.

The mistake most replies make is to treat the section 280 notice, or the section 281 show-cause, as a self-contained document. It is not. Section 279 (formerly section 147) carries the power to reassess income that has escaped assessment. Section 281 (formerly section 148A) requires the officer to give the taxpayer a show-cause opportunity before issuing any notice. Section 280 (formerly section 148) is the notice itself. Section 282 (formerly section 149) fixes the time within which the notice and show-cause may issue. Section 284 (formerly section 151) requires a specified authority to sanction the notice. Section 286 (formerly section 153) fixes the deadline to complete the order.

Each of these is a condition, not a description. If the show-cause was inadequate, or the sanction was mechanical, or the notice was time-barred, the reassessment is vulnerable regardless of the merits of the underlying income. The reply is where those conditions are tested, one by one.

2. First, Decide Which Act Governs Your Notice

The Act that governs your reassessment depends on the tax year, not the date of the notice. The 2025 Act reassessment provisions apply from Tax Year 2026-27. For any year beginning before 1 April 2026, reassessment continues under the 1961 Act, preserved by section 536(2)(c). This single decision sets the language of the entire reply.

Before anything else, fix which Act applies, because it changes every citation in the reply. If the show-cause or notice concerns a year beginning before 1 April 2026, the 1961 Act framework (sections 147 to 151) governs, even though the notice issues in 2026 or later; section 536(2)(c) of the 2025 Act preserves it. If it concerns Tax Year 2026-27 or later, the new framework (sections 279 to 286) applies. Getting this wrong undermines the whole reply: an objection framed under the wrong Act can be set aside without reaching its substance. Identify the tax year on the notice, choose the framework, then draft.

3. The Section 281 Show-Cause: What It Must Contain, and Why It Is Decisive

Before issuing a section 280 notice, the officer must serve a show-cause under section 281, accompanied by the information suggesting that income has escaped assessment, and must consider your reply before passing a reasoned order with the approval of a specified authority. This is the taxpayer’s first, and often best, opportunity to stop the reopening.

Section 281 (formerly section 148A) is the safeguard that turned reassessment from a unilateral act into a quasi-adjudicatory pre-notice stage. The officer must have information suggesting escapement; must serve a show-cause giving that information; must consider the reply and the material on record; and must then pass a reasoned order, with the sanction of the specified authority, deciding whether it is a fit case to issue the section 280 notice. The show-cause is where the reopening is contested on paper, before any notice exists. A weak or casual reply here narrows the defence available later and can invite an adverse order that then colours the assessment. The procedure is skipped only in defined cases, such as information received under the faceless collection scheme (section 260) or certain search cases; where it applies, it is mandatory, and its omission is itself a ground.

4. Drafting the Reply: Four Tests Every Reassessment Reply Should Apply

A reassessment reply is not a narrative. It is a set of tests applied to the officer’s own material: has the information been fully disclosed; is it relevant and admissible; is it ‘information’ within the meaning of the Act; and does it actually establish escapement of income, as a matter of fact, rather than suspicion.

The reply is built around the department’s material, not the taxpayer’s story. Four tests do most of the work.

Demand full disclosure. If the officer shares only a generic extract, for instance a bare information detail from the insight portal, demand full particulars of all material relied on. If it is not given, reply without prejudice, recording that the proceeding is happening without full disclosure and in breach of natural justice and of section 281 itself.
Test relevance and admissibility. Once the material is disclosed, ask whether it is relevant and admissible. Loose sheets or a third party’s diary are not books of account kept in the regular course of business, and their evidentiary value is open to challenge.
Test whether it is information. The reopening must rest on information of the kind the Act recognises. Where the material does not answer that description, the reply should say that no valid show-cause could issue on it.
Test whether escapement is established as fact. Finally, ask whether the material actually shows that income has escaped assessment as a matter of fact, and not merely as a possibility. Where it does not, that is the core of the reply.

5. The Trigger: Information, Not a Bare Reason to Believe

The reopening trigger is information that suggests income has escaped assessment. It is not the old subjective ‘reason to believe’. The firm’s position, argued in its published work, is that an information-based, fact-tested trigger asks more of the department than a bare belief, and a reply should hold the officer to that standard.

Under both the post-2021 regime and the 2025 Act, the officer must have information suggesting that income chargeable to tax has escaped assessment. The older language of ‘reason to believe’ is gone. The firm’s analytical position, set out in its published writing on reopening, is that this shift matters: where the statute speaks of information that suggests escapement, the reply can legitimately insist that escapement be shown on the material, as a factual matter, rather than accepted on the officer’s subjective satisfaction. This is a position to be argued, not a settled holding, and it should be framed as such in the reply.

A related and well-recognised ground is that the sanction and the officer’s satisfaction must reflect a genuine application of mind. Approval or satisfaction that is mechanical, or borrowed wholesale from an investigation wing or a system-generated alert without independent evaluation, is open to challenge. Where the record shows the officer merely adopted another’s conclusion, that goes to the validity of the reopening itself.

6. Time Limits, the Fifty-Lakh Threshold, and Sanction

Under the 2025 Act, a section 281 show-cause is barred after four years from the end of the tax year, or six years where the escaped income is fifty lakh rupees or more, represented as an asset, expenditure or entry. The section 280 notice runs three months longer. No notice issues in the first year. Sanction under section 284 is required before the notice.

Section 282 (formerly section 149) fixes the outer limits, and they are a live ground in most replies. The show-cause under section 281 is generally barred once four years have elapsed from the end of the relevant tax year, extended to six years only where the officer holds books, documents or evidence showing that escaped income, represented in the form of an asset, expenditure or an entry, amounts to or is likely to amount to fifty lakh rupees or more. The section 280 notice carries a limit three months longer, at four years three months, or six years three months in the high-value case, and no notice issues within the first year after the tax year ends.

Two points repay attention. The fifty-lakh threshold attaches to the escaped income the information actually points to, not to some larger aggregate; a small addition does not become a high-value case because unrelated figures add up to fifty lakh. And the notice must carry the sanction of the specified authority under section 284 (formerly section 151); a sanction granted without application of mind is challengeable on that ground alone.

7. Service and Jurisdiction: the Procedural Grounds

A reassessment can fail on procedure alone. The notice must be validly served, and jurisdiction can be questioned within the time the Act allows. Where a taxpayer was never validly served with the show-cause and so could not participate, that is a ground that can be carried into a writ petition.

Service is not a formality. The notice and show-cause must be served in the manner the Act and the rules require, and the service provisions, now in section 523 of the 2025 Act, matter to any objection; that section also deems a summons duly served where the person has appeared or cooperated, so an objection to service is best taken before the assessment is completed rather than after. Where a taxpayer was not validly served with the section 281 show-cause and was therefore unable to participate, the point can be preserved and taken to the High Court. Jurisdiction, too, can be questioned within the period the Act allows under section 242, and is best raised early.

8. After an Adverse Order: Assessment, Appeal or Writ

If the officer passes an order under section 281 deciding it is a fit case and issues the section 280 notice, two routes remain. You can participate in the reassessment through faceless assessment and appeal, preserving every ground; or you can challenge the reopening itself by writ under Article 226, on grounds such as limitation, sanction, want of information or non-service.

An adverse pre-notice order is not the end of the matter. The first route is to participate: file the return sought, contest the additions through faceless assessment under section 273 (formerly section 144B), and carry the matter through the Commissioner (Appeals) under section 356 and the Income Tax Appellate Tribunal under section 362, preserving every objection on the way. The second route, available where the reopening is itself defective, is a writ petition under Article 226 of the Constitution before the jurisdictional High Court, challenging the section 280 notice and the section 281 order on grounds that go to the root: that the notice was time-barred, that the sanction under section 284 was absent or mechanical, that there was no information within the meaning of the Act, or that the show-cause was never validly served. Which route to take is a strategic decision that turns on the strength of the procedural grounds and the stage reached.

The Reassessment Chain, 1961 Act to 2025 Act

Step	1961 Act	2025 Act	What it does
Power to reassess	147	279	Empowers the officer to assess income that has escaped assessment
Pre-notice show-cause	148A	281	Officer must give an opportunity to show cause before any notice
Reopening notice	148	280	Requires a return for the reopened tax year
Time limit for notices	149	282	Four years, or six years where escaped income is 50 lakh or more
Sanction	151	284	Specified authority must sanction the notice
Completion of order	153	286	Deadline to pass the reassessment order
Savings for old years	n/a	536(2)(c)	Years beginning before 1 April 2026 stay under the 1961 Act

Frequently Asked Questions

What is the difference between a section 281 show-cause and a section 280 notice?

A section 281 show-cause (formerly section 148A) comes first: it asks you to show cause, with the information attached, why the year should not be reopened. A section 280 notice (formerly section 148) comes only after the officer, having considered your reply, passes a reasoned order deciding it is a fit case; it requires you to file a return for the reopened year. The show-cause stage is where the reopening is most effectively resisted.

My reassessment notice is for an old year but was issued in 2026. Which law applies?

The tax year decides, not the date of the notice. Reassessment of a year beginning before 1 April 2026 continues under the 1961 Act (sections 147 to 151), preserved by section 536(2)(c) of the 2025 Act, even though the notice issues in 2026 or later. Only Tax Year 2026-27 and later fall under the new sections 279 to 286. The reply must be framed under the correct Act.

The officer shared only a brief information extract. What should I do?

Demand full particulars of all the material and information relied on. A generic extract, such as a bare information detail from the insight portal, is not full disclosure. If the officer does not provide it, file your reply without prejudice, recording that full particulars were not supplied and that the proceeding is therefore happening in breach of natural justice and of section 281. That objection is preserved for any later challenge.

How far back can a year be reopened under the 2025 Act?

A show-cause under section 281 is generally barred four years after the end of the tax year, extended to six years only where the escaped income, represented as an asset, expenditure or entry, is fifty lakh rupees or more. The section 280 notice runs three months longer, and no notice issues in the first year. Years beginning before 1 April 2026 are governed by the 1961 Act limits instead.

Can I challenge a reassessment before the High Court instead of going through assessment?

Yes, where the reopening is itself defective. A writ petition under Article 226 can challenge the section 280 notice and the section 281 order on grounds such as limitation, absent or mechanical sanction, want of valid information, or non-service. Where the grounds are weaker, it is often better to participate in the reassessment and preserve the objections for appeal. The choice is strategic.

Does an adverse order under section 281 mean I have lost?

No. An adverse order under section 281 only means the officer has decided to issue the section 280 notice. You can still contest every addition through faceless assessment and appeal to the Commissioner (Appeals) and the Income Tax Appellate Tribunal, or challenge the reopening by writ. The order fixes the department’s decision to reopen; it does not decide the tax.

How R & D Law Chambers Works on These Matters

R & D Law Chambers acts for taxpayers at every stage of a reopening, from the section 281 show-cause through faceless reassessment, appeal and writ. The practice is led by a dual-qualified lawyer (India and England and Wales) who holds the Advanced Diploma in International Taxation, and who has written on the reopening of assessments and the drafting of replies to pre-notice show-cause notices.

The firm’s method is the one this guide describes: read sections 279 to 286 as a single code, fix the governing Act before drafting, and build the reply around the officer’s own material rather than the taxpayer’s narrative. It is at the show-cause stage, not after the notice, that a reopening is most often stopped.

Related services and reading:

This article is general information on Indian law as at 20 August 2026 and is not legal advice. It does not create a lawyer-client relationship. Section references are to the Income-tax Act, 2025 unless otherwise stated. Reassessment of a year beginning before 1 April 2026 is governed by the Income-tax Act, 1961. Specific advice should be taken on any particular notice before acting.