An omitted bank-interest entry, an incorrect income head or a missed return can require an update. ITR-U is a restricted route under section 139(8A), generally available within 48 months from the end of the relevant assessment year. This guide explains the eligibility checks, additional-tax bands and worked arithmetic for the older years currently open.
Quick answer: ITR-U (Section 139(8A)) lets you declare missed income for the last four assessment years by paying the tax, the interest, and an extra fee called additional tax: 25% in year one, then 50%, 60% and 70% of the tax plus interest. You cannot use it to claim a refund. File early: the same mistake gets more expensive every 12 months.
What is ITR-U, in truly simple words
For AY 2026-27, a revised return under section 139(5) can be filed until 31 March 2027 or completion of assessment, whichever is earlier, subject to section 234-I. Earlier assessment years had different revision windows. ITR-U is a separate, restricted route for updating eligible older returns; it is not a substitute for a refund claim or an unrestricted revision.
Three words you will see everywhere, defined once:
- Assessment year (AY): the year in which a return for the previous financial year is filed and checked. Income you earned in FY 2024-25 is filed in AY 2025-26. The 48-month ITR-U clock runs from the END of the assessment year.
- Additional tax: the extra fee for using ITR-U. It is a percentage of the tax plus interest you owe on the missed income, not a percentage of the income itself.
- CPC: the Centralised Processing Centre in Bengaluru, the automated system that checks every return. Its computers compare your return with the AIS, so unreported interest and trades are exactly how people get caught.
Who can file ITR-U, and who cannot
You missed income in a filed return. You never filed at all. You picked the wrong income head. You need to pay more tax for any reason. From 1 March 2026 you can even file one that reduces a loss you had claimed, provided the original loss return was filed on time.
The change would lower your tax or create or increase a refund. A specified search, requisition or survey covers you or the relevant year; the bar is not limited to an event currently in progress. You already filed an ITR-U for that year (one shot per year). Assessment, reassessment or revision proceedings are pending or completed for the year, unless a specific exception permits filing. Communicated information, prosecution and other exclusions also need a check. The loss-reduction and section 148 exceptions have their own conditions.
What ITR-U actually costs, with the full maths
The bill has four parts: the tax on the missed income, interest under Sections 234A, 234B and 234C, the late fee under Section 234F if you never filed the original return, and then the additional tax on top. The additional tax depends only on how late you are:
| When you file (from end of the AY) | Additional tax |
|---|---|
| Within 12 months | 25% of tax + interest |
| 12 to 24 months | 50% of tax + interest |
| 24 to 36 months | 60% of tax + interest |
| 36 to 48 months | 70% of tax + interest |
Example 1: Ravi and the forgotten FD interest
Ravi is a salaried employee. He filed his AY 2025-26 return on time, but forgot Rs 40,000 of FD interest that his bank reported to the AIS. He files an ITR-U in August 2026, which is within 12 months of 31 March 2026, so the 25% band applies. His slab rate is 20%:
- Tax on Rs 40,000 at 20% = Rs 8,000, plus 4% cess = Rs 8,320
- Assumed separately computed interest under the applicable provisions = Rs 1,180 (used here only to demonstrate the additional-tax arithmetic)
- Additional tax = 25% of (8,320 + 1,180) = Rs 2,375
- Total payable: about Rs 11,875. No 234F fee, because his original return was filed on time.
At a later 50% band, the additional tax would be Rs 4,750 if the same Rs 9,500 tax-plus-interest base were used. In a real later filing, additional interest can increase that base. Recompute the whole return, including rebate and credits; do not apply a marginal rate blindly to omitted income.
Example 2: Meena, who never filed at all
Assume Meena has Rs 8,00,000 of taxable professional profit for FY 2023-24 (AY 2024-25), is a resident individual using the new regime, has no other income or tax credits, and was required to file but did not. The normal slabs give Rs 15,000 on Rs 3 to 6 lakh and Rs 20,000 on Rs 6 to 8 lakh: Rs 35,000 tax plus 4% cess = Rs 36,400. An ITR-U in July 2026 falls in the 50% additional-tax band. For illustration, assume the separately computed interest is Rs 5,100:
- Tax + cess = Rs 36,400
- Assumed interest, to be calculated from the actual dates and instalments = Rs 5,100
- Late fee under 234F (income above Rs 5 lakh) = Rs 5,000
- Additional tax = 50% of (36,400 + 5,100) = Rs 20,750
- Illustrative total = Rs 36,400 + Rs 5,100 + Rs 5,000 + Rs 20,750 = Rs 67,250. This demonstrates the arithmetic; actual interest, eligibility and liability need the full return records.
An updated return can correct eligible omissions, but does not confer blanket immunity from all proceedings or penalties. The section 270A(11A) protection for income covered by a qualifying section 148 updated return is specific; obtain case-specific advice where a notice or exclusion is involved.
Which years can you still fix, as of 8 September 2026
| Assessment year (income year) | Band if you file NOW | Band rises next on | Final ITR-U deadline |
|---|---|---|---|
| AY 2025-26 (FY 2024-25) | 25% | 1 April 2027 (to 50%) | 31 March 2030 |
| AY 2024-25 (FY 2023-24) | 50% | 1 April 2027 (to 60%) | 31 March 2029 |
| AY 2023-24 (FY 2022-23) | 60% | 1 April 2027 (to 70%) | 31 March 2028 |
| AY 2022-23 (FY 2021-22) | 70% | Already in the last band | 31 March 2027 |
Current filing window: AY 2022-23 reaches its ordinary 48-month updated-return limit on 31 March 2027. For AY 2026-27, use the applicable original, belated or revised route while available; the revised-return limit is 31 March 2027 or earlier assessment completion, subject to section 234-I. Do not describe every late revision as free.
What the Finance Act 2026 changed, from 1 March 2026
- Loss reduction: From 1 March 2026, the amended provision allows an eligible updated return reducing the loss in an original loss return furnished on time. This is a specific exception, not permission to create or increase a loss. Earlier law already allowed some loss-return-to-positive-income updates.
- ITR-U after a reassessment notice. Earlier, a Section 148 notice slammed the ITR-U door shut. Now you can file within the time given in the notice, paying an extra 10 percentage points (so 35%, 60%, 70% or 80%). In exchange, the new Section 270A(11A) shield means the income you disclose this way cannot be used to charge the under-reporting penalty. Filing does not automatically close the reassessment, so take advice in notice cases.
How to file ITR-U, click by click
- Work out the bill first. Compute the missed income, the tax and cess, the interest, the 234F fee if the original was never filed, and the additional tax band from the table above. The ITR-U form (Part B-ATI) asks for these figures explicitly.
- Pay the tax before filing. Log in at incometax.gov.in, go to e-File, then e-Pay Tax, choose the correct assessment year, and pay under the self-assessment head. Keep the challan number; the form asks for it. The payment screens work exactly like our e-Pay Tax walkthrough.
- Start the return. Go to e-File, then Income Tax Returns, then File Income Tax Return. Pick the assessment year you are fixing, then choose the filing type 139(8A), Updated Return.
- Fill your normal ITR plus the ITR-U part. You file the same ITR form that applies to you (ITR-1 to ITR-4 for most people; use our form picker if unsure) with the corrected figures, and the ITR-U wrapper asks two extra things: the reason (a dropdown: income not reported correctly, wrong head, return not filed earlier, and so on) and the Part B-ATI tax computation with your challan details.
- Verify within 30 days. E-verify with Aadhaar OTP or net banking. An unverified ITR-U is treated as never filed.
The mistakes that get ITR-U filings rejected
- Paying after filing instead of before. The additional tax must be paid and the challan quoted inside the form, or the return is invalid.
- Using it to claim a refund. The utility will simply block a return where the tax payable falls. That correction needed a revised return, whose window has closed.
- Wrong band arithmetic. The 25% to 70% applies to tax PLUS interest, not tax alone, and not the income.
- Forgetting the second year. If you missed FD interest in one year, you probably missed it in the next too. Check the AIS for each year before filing.
- Missing the one-shot rule. Only one ITR-U per assessment year, ever. Get it complete the first time.
How people discover they need ITR-U
Almost always from the AIS, the Annual Information Statement, which lists every interest credit, dividend, share sale and property deal reported against your PAN. Pull it for the past years, compare it with what you filed, and you will know in ten minutes whether you have a gap. Our AIS vs 26AS vs TIS guide shows exactly how to read it, and our Section 234 interest calculator estimates the interest part of your bill.
Frequently asked questions
What is ITR-U in simple words?
ITR-U is the updated return. It is a second chance to correct an income tax return you already filed, or to file one you missed completely, up to 48 months after the end of the assessment year. The catch is a fee called additional tax: the longer you wait, the more you pay, from 25% up to 70% of the tax and interest involved.
What is the last date to file ITR-U right now?
Each year has its own deadline. As of 8 September 2026 you can still file ITR-U for AY 2022-23 (until 31 March 2027 at 70%), AY 2023-24 (60% until 31 March 2027), AY 2024-25 (50% until 31 March 2027) and AY 2025-26 (25% until 31 March 2027). The earlier you file, the cheaper the band.
Can I claim a refund by filing ITR-U?
No. An updated return cannot create or increase a refund or reduce the earlier tax liability. A qualifying loss-reduction update is a separate statutory exception. The appropriate correction or refund-claim route depends on the year, the error and the available time limit; the AY 2026-27 revised-return deadline should not be applied retrospectively to every earlier year.
Can I file ITR-U if I never filed the original return?
Yes, if the year and case meet the updated-return conditions. Where a return was required and filed late, section 234F can impose Rs 5,000, limited to Rs 1,000 if total income does not exceed Rs 5 lakh. It is not automatic merely because no earlier return exists. Tax, applicable interest and additional tax are computed separately.
What happens if I got a Section 148 reassessment notice?
From 1 March 2026, under the Finance Act 2026, you can file ITR-U even after a Section 148 notice, within the time given in the notice. It costs an extra 10 percentage points of additional tax (so 35% to 80% instead of 25% to 70%), but the income you disclose this way cannot then be used to levy the Section 270A penalty, which can otherwise be 50% to 200% of the tax.
Do I need a CA to file ITR-U?
Not necessarily. If the correction is simple, like missed bank interest, the portal walks you through it and this guide covers each step. If the missed income is large, spans several years, or a notice is already involved, a professional is worth the fee because the additional-tax maths and the reason codes must be exactly right.
Official source: The updated-return provisions and the current utility are on incometax.gov.in.
Related: Which ITR form to file · AIS vs 26AS vs TIS · Section 234 interest calculator · How to pay tax online
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The table shows the ordinary updated-return bands for the listed completed assessment years.
Sources: Finance Act 2026, sections 5, 6 and 18; Official return downloads.