Section 280 Reassessment Under the New Tax Law: What CFOs and Founders Need to Watch

Reassessment Under Section 280 of the Income-tax Act, 2025: A Defence Playbook for Tax Year 2026-27

The first reassessment disputes under the new Income-tax Act, 2025 will not turn on lofty tax theory. They will turn on timing, paperwork, approval trails, and whether the Department followed the statute exactly. That is why sections 280 and 281 matter so much. They are the new reopening machinery for tax years beginning on or after 1 April 2026, and the Department has already clarified that earlier years continue under the repealed 1961 Act. In other words, the transition is not abstract; it decides which law applies, which deadlines matter, and how a taxpayer should defend the notice.

Why this matters now

For founders, SMEs, NRIs, and CFOs, reassessment is rarely a one-line tax issue. It can affect provisioning, lender comfort, investor diligence, and even how quickly a refund or assessment cycle moves. Under the new Act, the first question is not whether income has escaped assessment. The first question is whether the reopening itself is legally valid. That is a major shift in practical defence strategy, because the statute now places a visible procedural gate in front of the notice.

There is also a clean transition rule that taxpayers should not miss. The Income-tax Department’s FAQs say sections 279–286 apply to tax year 2026-27 and subsequent tax years; for any tax year beginning before 1 April 2026, the old Act continues to govern reassessment. So a notice issued after 1 April 2026 does not automatically mean the new Act applies. The year in question still controls the law.

Section 281 is the real gatekeeper

Section 281 is where the defence often begins. Before the Assessing Officer issues any notice under section 280, the officer must first serve a show-cause notice, attach the information suggesting escapement, give the taxpayer an opportunity to reply, and then pass an order with prior approval deciding whether it is a fit case for reopening. That structure is not cosmetic. It is the statute’s built-in natural justice filter.

For taxpayers, the practical significance is simple: the Department does not get to skip straight to the reopening notice unless the case falls within a statutory exception. Those exceptions are narrow and cover information received under a notified scheme, directions from the Approving Panel, or a finding/direction in an order of an authority, tribunal, or court. Even then, the Department’s own FAQs say the officer may be excused from the section 281 procedure, but prior approval remains mandatory before the section 280 notice is issued. That detail is easy to miss, and it is often where sloppy reopenings start to crack.

Section 280 is the notice, not the whole case

Section 280 is the actual reopening notice. It is issued before assessment, reassessment, or recomputation, and it must be accompanied by the order passed under section 281(3). The notice must ask the assessee to furnish a return, and the return window must be at least 30 days and no more than three months from the end of the month in which the notice is issued. If the return comes after that period, the statute says it will not be treated as a return under section 263.

That may sound technical, but it matters in practice. A lot of taxpayers respond informally, with partial reconciliations or a hurried note. That can be risky. Once a section 280 notice lands, the response should be structured as a litigation document, not a routine tax email. The tax team needs to preserve objection rights, limitation arguments, and factual reconciliation separately.

A less-discussed change is institutional. Finance Act, 2026 amended section 279 so that, for sections 280 and 281, “Assessing Officer” means an officer other than the National Faceless Assessment Centre or any assessment unit referred to in the faceless machinery. That means reassessment under the new Act is not just a digital workflow issue; it also has a more traditional officer-facing process layer. For businesses, that increases the importance of service, file-noting, and the approval record.

The deadlines are the first line of defence

The limitation rules in section 282 are unusually taxpayer-relevant. No notice under section 280 or section 281 can be issued within one year from the end of the relevant tax year. Beyond that, the general cut-off for section 281 is four years from the end of the tax year, with an extended window up to six years only where the escaped income is likely to be ₹50 lakh or more. For section 280, the corresponding window is four years and three months, with an extension up to six years and three months where the AO has books, documents, or evidence showing escaped income of ₹50 lakh or more.

This is where many reassessment notices fail or become vulnerable. The taxpayer should verify the exact tax year, the exact date of the notice, and the exact basis on which the Department is claiming the extended period. If the notice is outside limitation, the merits may never need to be reached. In defence work, that is not a technicality; it is often the strongest point.

What a smart defence looks like

The best response to a section 280 notice is not emotional, and it is not purely factual. It is sequenced.

First, confirm which law applies. If the tax year began before 1 April 2026, the old Act governs the reassessment, even if the notice is issued later. That one point can completely change the strategy.

Second, test whether the Department really has the kind of “information” the statute contemplates. Under section 280, the AO must have information suggesting escapement. Under section 281, that information must be shared with the taxpayer, followed by a hearing and a reasoned approval-based order. If the notice is based on a vague mismatch, a generic risk flag, or a poorly explained audit objection, the first attack is on the quality of the foundation, not on the tax amount.

Third, check the approval trail. The law requires prior approval of the specified authority in the section 281 order, and section 280 also requires prior approval in specified circumstances. If the paper trail is incomplete, inconsistent, or signed by the wrong authority, the taxpayer may have a serious procedural objection even before the merits are discussed.

Fourth, keep merits and jurisdiction separate. A common mistake is to explain every accounting entry in detail while ignoring the jurisdictional defects. That can be a costly error. A weak response on facts may be salvageable later; a missed limitation point may not be.

What this means in real business life

For a startup founder, the trigger may be a mismatch between share premium, revenue recognition, and bank inflows. For an SME owner, it may be expense disallowances, related-party payments, or a return not reconciling with books. For an NRI, it may be foreign income, residency position, or asset reporting. For a CFO, the issue may be a provisioning question: how likely is the exposure, and how much of the notice is actually defensible? These are different fact patterns, but the defence logic is the same: verify the year, the statute, the limitation, the approval, and the quality of the information before reacting on the merits.

The new Act’s reassessment framework is therefore not only about revenue protection. It also raises the bar for administrative discipline. That is good for compliant taxpayers, because the law now gives them a clearer procedural roadmap to challenge defective reopenings. But it also means taxpayers need better recordkeeping than ever. If the return, books, board notes, and statutory filings do not tell a consistent story, reassessment becomes easier to defend for the Department.

Bottom line

Section 280 will be one of the first serious litigation battlegrounds under the Income-tax Act, 2025. Not because the provision is strange, but because it is procedural, time-sensitive, and easy to get wrong. For taxpayers, that creates an opening. A well-prepared defence will not start with a long explanation of income. It will start with a short, hard question: did the Department follow sections 281 and 282 before issuing the notice under section 280? In many cases, that is where the case will turn.