The 31 July due date passes, and the panic sets in: "Have I lost the chance to file? Will I get a notice?" The honest answer is that the law gives you several second chances — they just cost progressively more. Knowing which door you're walking through, and by when, is the difference between a small fee and an expensive one.
Here is the complete map for Assessment Year 2026-27 (Financial Year 2025-26), in plain language.
First, the deadline that just passed
For most individuals — salaried, pensioners and others whose accounts don't need an audit — the due date to file the original return for AY 2026-27 is 31 July 2026. File on or before that date and none of the costs below apply.
Miss it, and you move into one of three options.
Option 1 — Belated return (the most common)
A belated return is simply a return filed after the due date. Under Section 139(4), you can file it any time up to 31 December 2026 for AY 2026-27.
What it costs:
- Late fee under Section 234F: ₹5,000. This is reduced to ₹1,000 if your total income is up to ₹5 lakh.
- Interest under Section 234A: 1% per month on any unpaid tax, from 1 August until you file.
- You lose the right to carry forward most losses (capital losses, business losses) — a hidden cost that can be far larger than the fee if you had losses to set off in future years.
A belated return is the right move if you've simply missed the date — file it well before 31 December and move on.
Option 2 — Revised return (you already filed, but made a mistake)
If you have filed — on time or belated — and then spot an error (a missed interest income, a wrong deduction, a forgotten capital gain), you don't file again from scratch. You file a revised return under Section 139(5).
- Deadline: also 31 December 2026 for AY 2026-27.
- Cost: none for the act of revising itself — though any additional tax that becomes due carries the usual interest.
- You can revise more than once if needed, up to the deadline.
The revised return completely replaces the earlier one. This is the clean way to fix a genuine mistake before the department flags it.
Option 3 — Updated return (ITR-U) — the long-window safety net
What if you realise — months or years later — that you under-reported income or never filed at all, and 31 December has passed? This is where the Updated Return (ITR-U) under Section 139(8A) comes in.
A major change took effect from 1 April 2025: under the Finance Act, 2025, the ITR-U window was extended from 24 months to 48 months. For AY 2026-27, that means you can file an updated return up to 31 March 2031.
The catch is cost. ITR-U is meant for coming clean, not for routine filing, so it carries additional tax under Section 140B on top of your tax and interest, rising the longer you wait:
- Within 12 months of the AY end — 25% additional tax
- Within 24 months — 50%
- Within 36 months — 60%
- Within 48 months — 70%
ITR-U also cannot be used to reduce income, claim a refund, or increase a refund — it's strictly for declaring more income. Used correctly, it's a genuine safety net that keeps you out of far more serious trouble under search and reassessment provisions.
Which option fits you
- Haven't filed, before 31 Dec 2026: file a belated return (Section 139(4)), pay the 234F fee + 234A interest.
- Already filed, found an error, before 31 Dec 2026: file a revised return (Section 139(5)).
- Missed everything, or under-reported, after 31 Dec 2026: file an updated return (ITR-U), accept the Section 140B additional tax — but do it before it climbs.
Common mistakes
- Treating 31 July as an absolute cut-off and doing nothing — you almost always still have a route.
- Forgetting that a belated return forfeits loss carry-forward — file on time precisely in the years you have losses.
- Using ITR-U to try to claim a refund — it doesn't allow that.
- Ignoring the AIS mismatch that caused the problem; fix the underlying data, not just the form.
Frequently asked questions
What is the last date for a belated return for AY 2026-27?
31 December 2026, under Section 139(4), with a Section 234F late fee (₹5,000, or ₹1,000 if total income is up to ₹5 lakh) and Section 234A interest on unpaid tax.
Can I revise my return after filing?
Yes — a revised return under Section 139(5) can be filed up to 31 December 2026 for AY 2026-27, and more than once if needed.
How long do I have to file an updated return (ITR-U)?
Up to 48 months from the end of the assessment year — so 31 March 2031 for AY 2026-27 — with additional tax under Section 140B that rises from 25% to 70% the later you file.
Will I definitely get a notice if I file late?
Not automatically. Filing a correct belated or updated return is exactly how you reduce notice risk. The bigger risk is not filing when your AIS shows income.
Don't let a missed date become an expensive one
Every week of delay adds interest, and crossing 31 December pushes you from a modest belated-return fee into the much costlier ITR-U regime. If you've missed the deadline or spotted an error, the cheapest move is almost always the soonest one.
Talk to RDA about your filing — we'll tell you exactly which return you need and file it correctly, the first time.
Written by CA Rahul Dang, Founder & Practice Lead, RDA Tax Advisory Services Pvt Ltd, Baner, Pune.
