How do you file ITR-U for AY 2026-27? Work out the extra income, then pay the tax, interest, any late fee and the additional tax (25% to 70% of tax plus interest) through Challan 280 before filing. Then file the updated return in the right ITR form on the e-filing portal by 31 March 2031 and e-verify it within 30 days.
Key Takeaways
- ITR-U only adds tax. It cannot be a return of loss, cannot lower the tax of an earlier return, and cannot create or increase a refund (Section 139(8A), first proviso).
- Window for AY 2026-27: 48 months from the end of the assessment year, so up to 31 March 2031.
- Cost: additional tax of 25%, 50%, 60% or 70% of the tax and interest due, depending on how many years have passed since 31 March 2027 (Section 140B(3)).
- Pay first, file second. The return must carry proof that the tax, interest, fee and additional tax are paid.
- One updated return per year, and none once a search, survey, assessment or reassessment covers that year.
This guide is the step-by-step filing checklist. For why the window moved from 24 to 48 months and which earlier years are still open, read our ITR-U 48-month window guide. If you would rather hand the filing over, see ITR filing services for updated returns.
Which Law Applies to AY 2026-27
AY 2026-27 covers income of FY 2025-26 (April 2025 to March 2026). The Income-tax Act 2025 took effect on 1 April 2026, but Section 536(2) keeps the Income-tax Act 1961 in force for proceedings about any year that began before 1 April 2026. So an updated return for AY 2026-27 is governed by Sections 139(8A) and 140B of the 1961 Act.
From tax year 2026-27 onwards, the same rules sit in Section 263(6) (updated return) and Section 267 (additional tax) of the Income-tax Act 2025. The 48-month window and the 25% to 70% rates are the same; the 2025 Act counts the window from the end of the financial year that follows the tax year, which works out to the same date. The Finance Act 2026 also added a further 10% of tax plus interest when an updated return is filed in response to a notice under Section 280 of the 2025 Act (Section 267(5)(ii)).
ITR-U vs Belated and Revised Returns
| Belated return | Revised return | Updated return (ITR-U) | |
|---|---|---|---|
| Section (1961 Act) | 139(4) | 139(5) | 139(8A) |
| Who can file | Anyone who missed the original due date | Anyone who filed an original or belated return | Anyone, whether or not a return was filed |
| Last date for AY 2026-27 | 31 December 2026 | 31 March 2027 | 31 March 2031 |
| Can lower tax or claim refund | Yes | Yes | No |
| Extra cost | Late fee under Section 234F plus interest | Section 234I fee if revised after 31 December 2026 | Additional tax of 25% to 70% of tax plus interest |
Our belated, revised and updated return guide covers the first two options in detail. Use ITR-U only when those windows have closed and the correction adds tax.
The Additional Tax Timeline for AY 2026-27
Section 140B(3) charges the additional tax as a share of the aggregate of tax and interest payable on the updated return. The clock starts at the end of the assessment year, 31 March 2027.
| ITR-U filed | Months after end of AY | Additional tax |
|---|---|---|
| After the belated or revised window closes, up to 31 March 2028 | Up to 12 | 25% of tax plus interest |
| 1 April 2028 to 31 March 2029 | 12 to 24 | 50% of tax plus interest |
| 1 April 2029 to 31 March 2030 | 24 to 36 | 60% of tax plus interest |
| 1 April 2030 to 31 March 2031 | 36 to 48 | 70% of tax plus interest |
Worked example (arithmetic only). Suppose the extra income in your ITR-U gives tax of Rs 40,000 and interest under Sections 234A, 234B and 234C of Rs 6,000. The aggregate is Rs 46,000.
- Filed by 31 March 2028: additional tax = 25% of Rs 46,000 = Rs 11,500. Total to pay = Rs 57,500.
- Filed in 2030-31: additional tax = 70% of Rs 46,000 = Rs 32,200. Total to pay = Rs 78,200.
Waiting three more years costs Rs 20,700 on the same income, which is why the oldest open years should be filed first. Our guides to Section 234A interest and Sections 234B and 234C show how the interest part is worked out.
When You Cannot File ITR-U
Section 139(8A) blocks an updated return in these cases:
- It reduces tax or adds a refund. The return cannot be a return of loss, cannot lower the tax liability of an earlier return, and cannot create or increase a refund. A missed deduction or missed expense therefore cannot go into ITR-U.
- A search, requisition or survey (other than under Section 133A(2A)) has taken place in your case, for that year and the years before it.
- You already filed an updated return for that assessment year.
- An assessment, reassessment, recomputation or revision for that year is pending or completed.
- The tax officer already holds information about you for that year under the black money, benami, PMLA or SAFEMA laws, or from a tax treaty exchange, and has told you so.
- Prosecution proceedings have started for that year.
- A show-cause notice under Section 148A was issued after 36 months from the end of the assessment year (unless the officer then decided under Section 148A(3) that it is not a fit case for a Section 148 notice).
If you filed a loss return on time, you may still file an updated return that is a return of income.
Step-by-Step: Filing ITR-U
Step 1: Confirm the correction adds tax
List each item you missed or under-reported: interest, rent, capital gains, business receipts or a deduction you should not have claimed. Pull the AIS and Form 26AS for that year first, because they show the income the department already knows about. Our AIS vs Form 26AS vs TIS guide explains which statement to rely on when they differ.
Recompute total income and tax. If the result is lower tax or a refund, stop: ITR-U is not available.
Step 2: Work out tax, interest and additional tax
Under Section 140B, the amount due is:
- Tax on the updated income, after advance tax, TDS, TCS and reliefs already claimed.
- Plus any refund already issued on the earlier return.
- Plus interest for late filing or short advance tax (less interest already paid in the earlier return).
- Plus any late fee (for example Section 234F, if no return was filed).
- Plus the additional tax at 25%, 50%, 60% or 70% of the tax and interest from items 1 to 3.
Step 3: Pay before you file
Pay the full amount through e-Pay Tax on the e-filing portal (Challan 280) for the relevant assessment year, under minor head 300 (self-assessment tax). Keep the BSR code, challan serial number and date: you enter them in the updated return. A short payment makes the return invalid, so recheck the total before paying. If you are unsure, talk to the Tax Garden team on call or WhatsApp before you pay.
Step 4: File the updated return
Log in to the income tax e-filing portal, choose the assessment year, select Updated Return as the filing type, and fill the ITR form that fits your income (ITR-1 to ITR-7). Our ITR filing guide for AY 2026-27 helps you pick the form. Give the reason for updating, the extra income, and the challan details from Step 3.
Step 5: E-verify within 30 days
The return counts as filed only once it is verified. E-verify within 30 days of uploading through Aadhaar OTP, net banking, a bank or demat EVC, or a DSC. Our ITR e-verification guide walks through each method.
Common Mistakes
| Mistake | What happens | How to avoid it |
|---|---|---|
| Working the additional tax on tax alone | Short payment; the return is invalid | Apply the rate to tax plus interest |
| Filing first and paying later | Return lacks proof of payment and is invalid | Pay through Challan 280 first, then file |
| Using ITR-U for a missed deduction | Not allowed; it lowers tax | Use a revised return by 31 March 2027 |
| Filing the latest year first | Older years move into a higher rate | File the oldest open year first |
| Missing e-verification | Return is not treated as filed | E-verify on the day you file |
Get Help with ITR-U
A wrong figure in an updated return cannot be fixed with a second ITR-U for the same year, so the computation matters. Tax Garden's ITR filing service prepares updated returns from your AIS and Form 26AS, works out the additional tax for each open year, and files the oldest years first.
Sources
- Income-tax Act, 1961 as amended by the Finance Act, 2025 (incometaxindia.gov.in): Section 139(4), 139(5), 139(8A) and its provisos, Section 140B(1) to (3).
- Income-tax Act, 2025 as amended by the Finance Act, 2026 (incometaxindia.gov.in): Section 263(6), Section 267(5) and Section 536(2).
