Key Takeaways
- Section 139(8A) now gives you 48 months from the end of the assessment year to file an updated return (ITR-U), up from 24 months (Finance Act 2025, effective 1 April 2025).
- Additional tax on the incremental liability: 25% (0-12 months), 50% (12-24 months), 60% (24-36 months), 70% (36-48 months).
- As of July 2026, AY 2022-23 through AY 2025-26 are open for ITR-U filing. AY 2021-22 window closed on 31 March 2026.
- You cannot file ITR-U to increase a loss, decrease tax, or claim a higher refund.
How long do I have to file an updated return (ITR-U) in 2026? You have 48 months from the end of the relevant assessment year under Section 139(8A) of the Income Tax Act, 1961, as amended by Finance Act 2025. For AY 2025-26, the last date is 31 March 2030. Additional tax ranges from 25% to 70% of the incremental tax and interest, depending on when you file. (Verified against: PIB PRID 154926, incometaxindia.gov.in Section 140B)
Forgot to report capital gains from a mutual fund redemption in FY 2022-23? Discovered an unreported rental income from two years ago? Before the 2025 Budget, you had only 24 months to correct such errors through an updated return. That window has now doubled.
Finance Act 2025 extended the ITR-U filing deadline from 24 months to 48 months from the end of the relevant assessment year. The trade-off: additional tax rates climb steeply the longer you wait. File early, and you pay 25% extra. File in the last year, and it is 70%.
Here's what the 48-month window means for you, which years are still open, and how to file without overpaying. If this is your first time filing an updated return, see our complete ITR filing guide or explore Tax Garden's ITR services.
Looking for expert help with updated return ITR-U filing assistance for individuals and businesses? The team at Tax Garden, based in Kondapur, Hyderabad, helps Indian SMEs stay compliant end-to-end: filings, notices, and advisory, all in one place.
What Changed Under Finance Act 2025?
Before Finance Act 2025, Section 139(8A) allowed filing an updated return within 24 months of the end of the relevant assessment year, with additional tax of 25% (first 12 months) or 50% (next 12 months).
The 2025 amendment made three changes:
- Extended window to 48 months. You now have four years instead of two.
- Two new additional tax slabs. The 60% slab covers months 25-36, and the 70% slab covers months 37-48 (Section 140B, as amended).
- Effective date: 1 April 2025. The extended window applies to assessment years where the 48-month period has not yet expired as of that date.
Budget 2026 added two more refinements: ITR-U can now be filed during open reassessment proceedings (with 10% additional tax on top), and for the first time, you can file to reduce (not increase) a reported loss.
How Much Additional Tax Will You Pay?
The additional tax under Section 140B is calculated on the incremental liability, not your total tax. That means: (tax + interest on the updated return) minus (tax + interest already paid or adjusted).
Tax Rate Chart
Additional Tax Rates on Updated Return (ITR-U)
Percentage of incremental tax + interest, based on filing delay
Within 12 months of end of AY
Lowest cost. File as soon as you spot the error.
12-24 months after end of AY
Double the additional tax vs. the first year.
24-36 months after end of AY
New slab added by Finance Act 2025.
36-48 months after end of AY
Maximum additional tax. Last chance before the window shuts.
Source: Section 140B, Income Tax Act, 1961 (as amended by Finance Act 2025)
Worked example: Say you had ₹2 lakh unreported interest income for AY 2024-25 (FY 2023-24). Your slab rate is 30%, so the incremental tax is ₹60,000. Add interest under Section 234A/234B at roughly ₹4,800 (calculated up to the date of payment). Total incremental liability: ₹64,800.
If you file ITR-U in August 2026 (within 24 months of 31 March 2025), additional tax is 50% of ₹64,800 = ₹32,400. Your total outgo: ₹64,800 + ₹32,400 = ₹97,200.
Had you filed before 31 March 2026 (within 12 months), additional tax would have been 25% = ₹16,200. Total: ₹81,000. That six-month delay cost ₹16,200 extra.
Which Assessment Years Are Still Open?
Not every old year qualifies. The 48-month clock starts from the end of the assessment year, so here is where each AY stands as of July 2026:
Deadline Timeline
ITR-U Filing Deadlines by Assessment Year
48-month window from the end of each AY
AY 2021-22 (FY 2020-21)
Window CLOSED. No longer eligible for ITR-U.
AY 2022-23 (FY 2021-22)
Final year of 48-month window. Additional tax: 70%.
AY 2023-24 (FY 2022-23)
Currently in 36-48 month window. Additional tax: 70%.
AY 2024-25 (FY 2023-24)
Currently in 12-24 month window. Additional tax: 50%.
AY 2025-26 (FY 2024-25)
Currently in 0-12 month window. Additional tax: 25%.
Source: Section 139(8A), Income Tax Act, 1961 (as amended by Finance Act 2025)
The pattern is clear: every month you delay moves you into a higher additional tax slab. AY 2025-26 has the lowest additional tax rate right now (25% until 31 March 2027). AY 2022-23 is in its final stretch at 70%.
Who Can File ITR-U, and Who Cannot?
ITR-U is not available to everyone, and it is not a free pass to rewrite your tax history. Section 139(8A) sets strict boundaries.
Comparison
ITR-U Eligibility: Can File vs. Cannot File
| Parameter | Can File ITR-U | Cannot File ITR-U |
|---|---|---|
| Purpose | Report additional income missed in original return | Claim higher refund or reduce tax liability |
| Original return | Filed, not filed, belated, or revised - all qualify | N/A - no restriction on original filing status |
| Loss returns | File to REDUCE a previously claimed loss (Budget 2026, effective 1 March 2026) | File to INCREASE a loss or report a new loss |
| Search/survey | No search or survey initiated against you | Search under Section 132 or survey under Section 133A is ongoing |
| Assessment | No assessment or reassessment completed or pending for that AY | Assessment order already passed (except during open reassessment per Budget 2026 with 10% additional tax) |
| Prosecution | No prosecution proceedings initiated for that AY | Prosecution proceedings initiated under the IT Act |
| Frequency | One ITR-U per assessment year | Second ITR-U for same AY (already filed one updated return) |
Source: Section 139(8A), Income Tax Act, 1961
One common misconception: you can file ITR-U even if you never filed the original return. It covers individuals, HUFs, firms, LLPs, companies, and AOPs. The form used is ITR-U, which wraps around the applicable ITR form (ITR-1 through ITR-7) for that assessment year.
How to File ITR-U on the Income Tax Portal
Filing happens on the e-Filing portal at incometax.gov.in. You must pay the full additional tax before or during the filing process. Need help? Tax Garden's compliance team handles the calculation and portal filing for you.
Step-by-Step Guide
ITR-U Filing Process
Complete these steps on incometax.gov.in
Calculate incremental tax + interest
Work out the difference between tax due on updated income and tax already paid. Apply the additional tax percentage based on your filing timeline (25%/50%/60%/70%). Include interest under Section 234A, 234B, and 234C where applicable.
Pay via e-Pay Tax (Challan 280)
Go to e-Pay Tax on the portal. Select Major Head 0021 (individuals) or 0020 (companies), Minor Head 400 (Tax on Regular Assessment). Pay the total: incremental tax + interest + additional tax + late fee under Section 234F if applicable. Save the challan receipt.
Start ITR-U on the portal
Log in → e-File → Income Tax Returns → File Income Tax Return. Select the assessment year. Choose 'Updated Return u/s 139(8A)' as the filing type. Select the reason from the dropdown (income not reported, wrong exemption claimed, etc.).
Fill the applicable ITR form
The portal maps you to the correct ITR form (ITR-1 through ITR-7) for that AY. Enter all income details as they should have been. The portal auto-calculates the additional tax based on your filing date.
Verify within 30 days
E-verify using Aadhaar OTP, net banking, or DSC within 30 days. An unverified ITR-U is treated as never filed. Do not skip this step.
Source: incometax.gov.in portal; Section 139(8A) and 140B, IT Act 1961
Pro tip for CAs: Before filing, pull the AIS (Annual Information Statement) for that assessment year. The AIS captures bank interest, mutual fund transactions, property transactions, and dividend receipts that your client may have missed. Cross-check the AIS against the original return to identify the exact income gap.
Common Mistakes When Filing ITR-U
1. Not accounting for interest under Section 234A/234B/234C. The additional tax is calculated on tax plus interest. If you calculate 25% on the tax alone and ignore the interest component, the portal will flag a short payment and reject the filing. Calculate interest first, then apply the additional tax percentage on the combined figure.
2. Paying additional tax under the wrong challan minor head. Use Minor Head 400 (Tax on Regular Assessment), not Minor Head 300 (Self-Assessment Tax). Getting this wrong does not invalidate the payment, but it creates reconciliation issues on your 26AS and delays processing.
3. Forgetting to e-verify within 30 days. An unverified ITR-U is treated as if it was never filed. You lose the additional tax you already paid (it becomes a credit, but you miss the compliance benefit). Set a calendar reminder the day you file.
4. Filing ITR-U when a revised return would have sufficed. If you are still within the deadline for a revised return under Section 139(5) (31 December of the assessment year), use that route first. No additional tax applies on a revised return. ITR-U is for situations where the revised return window has already closed.
What About the New Income Tax Act 2025?
The Income Tax Act 2025, which took effect on 1 April 2026, renumbers the updated return provision as Section 263(6)(a). For AY 2026-27 onwards, the new section numbers apply. However, for AY 2025-26 and earlier assessment years, the old Act (Section 139(8A)) continues to govern the ITR-U filing process.
In practical terms, the rules are identical. The 48-month window, the four additional tax slabs, and the eligibility restrictions all carry forward into the new Act. If you are filing ITR-U for any year up to AY 2025-26, you reference Section 139(8A). For AY 2026-27 onwards, the reference shifts to Section 263(6)(a).
Tax Garden Can Help
Filing an updated return involves calculating incremental tax across multiple sections, paying the right additional tax percentage, and getting the challan details correct. One miscalculation means a rejected filing or an overpayment. Tax Garden's compliance team handles the end-to-end process: we pull your AIS, calculate the exact liability, pay via the correct challan, file the ITR-U, and e-verify it. If you have unreported income from any year between AY 2022-23 and AY 2025-26, talk to us before the additional tax slab moves up.
ITR-U (Updated Return) FAQs
Can I file ITR-U if I never filed an original return?
Yes. Section 139(8A) allows filing an updated return whether or not you filed an original, belated, or revised return. The additional tax still applies based on the filing timeline.
Is ITR-U available if I want to claim a higher refund?
No. You cannot file ITR-U to increase a refund or decrease your tax liability. It is only for situations where you owe additional tax to the government.
How many times can I file ITR-U for the same assessment year?
Only once per assessment year. If you file an updated return for AY 2024-25, you cannot file a second updated return for the same AY.
Can I file ITR-U to reduce a loss I previously claimed?
Yes, from 1 March 2026 onwards (Budget 2026 amendment). You can file ITR-U to reduce a loss. You still cannot file to increase a loss or report a new loss.
What happens if I don't e-verify ITR-U within 30 days?
The updated return is treated as if it was never filed. The additional tax you paid remains as a credit in your account but the compliance benefit of filing is lost.
Does ITR-U replace the revised return?
No. If you are still within the revised return window (31 December of the assessment year for returns filed under Section 139(1)), file a revised return instead. No additional tax applies on revised returns. Use ITR-U only after that window closes.
Is the additional tax calculated on total tax or only the incremental tax?
Only on the incremental liability. It is the percentage of (tax + interest on the updated return) minus (tax + interest already paid). You do not pay additional tax on amounts you already settled.
What is the ITR-U deadline for AY 2024-25?
31 March 2029 (48 months from the end of AY 2024-25, which is 31 March 2025). As of July 2026, this falls in the 12-24 month window, so additional tax is 50% of the incremental liability.
This post covers Section 139(8A) of the Income Tax Act, 1961, as amended by Finance Act 2025 and Finance Act 2026. Rates, thresholds, and deadlines are current as of July 2026. Always verify against the latest CBDT notifications before filing, as rules can change mid-year. Source references: PIB (pib.gov.in), Income Tax Department (incometax.gov.in, incometaxindia.gov.in), Finance Act 2025 (Section 55, amending Section 139(8A) and Section 140B).
