ITR-U (Updated Return) 2026: The 48-Month Window, Additional Tax Slabs, and the Seven Situations Where You Can't File One

By Nitish Bharadwaj · Published Sep 23, 2026 · 7 min

An ITR-U lets you fix a return you filed wrong, or file one you skipped entirely, for up to 48 months after the assessment year ends — double the original window, after a Finance Act 2025 extension. It isn't free: additional tax runs from 25% in the first year to 70% in the fourth, on top of the regular tax, interest, and late fee already due. It also can't be used in seven specific situations, including anything that would create or increase a refund, report a loss, or apply once an assessment is already underway.

Most taxpayers know two ways to fix a filing problem: a belated return if you missed the July 31 deadline, or a revised return if you filed on time but got something wrong. Fewer know about the third route, which only becomes relevant once both of those windows have already shut — an Updated Return, or ITR-U, that stays open for up to four years after the assessment year ends, at a cost that climbs the longer you wait, and only in the direction of paying more.

What ITR-U Actually Is

Section 139(8A), introduced by the Finance Act 2022, lets a taxpayer file an Updated Return for a given assessment year regardless of whether they filed an original return, a belated one, a revised one, or nothing at all for that year. It exists specifically for voluntary correction of an understatement — income left out, a deduction wrongly claimed, the wrong ITR form used, or no return filed when one was legally required. It does not work the other way: an ITR-U can never be used to lower a tax bill, claim a bigger refund, or report a loss.

The Window: 48 Months, Not 24

When ITR-U was introduced, the filing window was 24 months from the end of the relevant assessment year. The Finance Act 2025 doubled that to 48 months, and added two new, steeper additional-tax tiers to go with the longer runway.

Why the Window Reaches Back Further Than You'd Expect

Because the clock runs from the end of each assessment year independently, a taxpayer filing in FY 2026-27 can still use ITR-U for AY 2022-23 — the earliest year still within its own 48-month window, which closes on March 31, 2027. Each assessment year carries its own separate 48-month countdown; it isn't a single rolling four-year window measured from today's date, so the deadline for an older year can be closer than it looks.

Seven Situations Where You Can't File an ITR-U

• The update would result in a refund, or increase a refund already claimed in the original return
• The update would reduce the total tax liability already determined for that year
• The update reports a loss, or increases a loss already declared
• A search under Section 132, or a survey under Section 133A, has been conducted for that year
• Assessment, reassessment, revision, or re-computation is pending or has already been completed for that year
• Prosecution proceedings under the Income Tax Act have already been initiated for that year
• An ITR-U has already been filed once for that same assessment year — it can only be used once per year

How It Sits Alongside Belated and Revised Returns

A belated return (filed after July 31 but before the year-end deadline) and a revised return (correcting a return already filed, within that same window) both carry only the standard Section 234F late fee and Section 234A/B/C interest where applicable — our belated ITR filing guide covers both in detail, including how ITR-U becomes the fallback once even the belated deadline has passed. ITR-U only becomes worth considering once those simpler, cheaper routes are no longer available — filing a belated or revised return while that window is still open is always less expensive than waiting for it to close and using ITR-U instead.

Before You File One

1. Rule out each of the seven disqualifying situations for your specific case — an ITR-U that gets rejected at processing still leaves the underlying discrepancy unresolved and the clock still running
2. Work out the additional tax slab based on how long it's been since the end of that assessment year, not from today's date
3. Pay the resulting self-assessment tax, interest, and additional tax before submitting — proof of this payment is required as part of the filing itself
4. Reconcile the income you're disclosing against Form 26AS and AIS for that year, using the same 26AS vs AIS reconciliation process used for a regular return, since a mismatch there is often what prompts the update in the first place
5. File using the ITR-U form together with the applicable regular ITR form for that assessment year — it isn't submitted as a standalone document