ITR-U updated return: 48-month window, additional tax, and which AYs you can still file in May 2026

The Scenario

Picture Rohan Iyer, a freelance designer in Pune. In April 2024 he filed ITR-2 for AY 2024-25 declaring Rs 14,80,000 of professional receipts. Six weeks later his old laptop drive came back from the data-recovery shop, and on it sat a 2023-24 ledger showing Rs 3,20,000 in Stripe payouts from a US client that he had forgotten to disclose. The original return is processed, the refund is credited, and the limitation period under Section 139(5) for a revised return (31 December 2024) has closed. He is now staring at an unreported income figure with potential exposure under Section 270A (50% under-reporting penalty) or Section 271(1)(c) for concealment.

This is exactly the gap that Section 139(8A) of the Income-tax Act, 1961 was inserted to fill. The Updated Return, popularly called ITR-U, lets a taxpayer voluntarily correct an omission, declare additional income or undo an over-claimed deduction long after Section 139(5) has expired. Finance Act 2025 has now stretched the window from 24 months to 48 months from the end of the relevant assessment year, with effect from 1 April 2025. As of May 2026, that means returns for AY 2022-23 through AY 2025-26 remain reachable, provided the taxpayer is willing to pay the extra cost.

This guide walks through the statute, the eligibility rails, the additional-tax escalator and a fully worked example for a salaried filer who missed AY 2025-26.

Statutory Answer

Section 139(8A) reads, in essence: "Any person, whether or not he has furnished a return under sub-section (1), sub-section (4) or sub-section (5) for an assessment year, may furnish an updated return of his income within forty-eight months from the end of the relevant assessment year." The 48-month figure is the post-amendment limit; the original FA 2022 text said 24 months. The change is operative from 1 April 2025.

The mechanics live in two places. The procedural skeleton (who can file, by when) is in Section 139(8A). The pricing (how much extra tax to pay) is in Section 140B.

What ITR-U cannot do. The provision is one-way: it can only increase your tax liability or reduce a previously claimed loss. ITR-U is barred where:

• The updated return is a return of loss (a fresh loss cannot be claimed via ITR-U)
• The updated return reduces the total tax liability already determined
• The updated return results in or enlarges a refund
• A search under Section 132, requisition under Section 132A or survey under Section 133A has been initiated for that AY
• An assessment, reassessment, revision or re-computation is pending or has been completed for that AY
• The Assessing Officer holds information under PMLA, Benami Property Act, Black Money Act, or Smugglers and Foreign Exchange Manipulators Act for the relevant period

A second important restriction: an assessee can file only one ITR-U for an AY (proviso to Section 139(8A)). You cannot keep updating an updated return.

Additional income-tax under Section 140B. The cost of using the window scales by how late you are. Finance Act 2025 introduced two new brackets (36 and 48 months) on top of the original two:

The additional tax is computed on the aggregate of (a) the tax payable on the updated income and (b) the interest payable under Sections 234A, 234B and 234C, but excluding the Section 234F late-filing fee. The Section 234F fee, however, must still be paid separately as part of total liability. Self-assessment tax already paid (Section 140A) is netted off before the percentage is applied.

AYs reachable in May 2026. The 48-month clock runs from the end of the relevant AY. AY 2022-23 ended 31 March 2023; 48 months later is 31 March 2027. AY 2025-26 ended 31 March 2026; the window for that AY stretches to 31 March 2030. The table below summarises the live AYs and the additional-tax bracket each one falls in today.

The arithmetic is unforgiving: each additional year of delay adds roughly 10 to 15 percentage points to the cost. AY 2021-22, whose 48-month window closed on 31 March 2026, is no longer reachable.

Worked Resolution

Take Priya Sharma, a salaried software engineer in Bengaluru. For FY 2024-25 (AY 2025-26) her Form 16 shows gross salary of Rs 15,00,000. She elected the new regime, claimed the Rs 75,000 standard deduction, and assumed her employer's TDS of Rs 1,20,000 would be enough, and never filed her ITR. The original due date was 31 July 2025; the belated-return window under Section 139(4) closed on 31 December 2025. It is now 14 May 2026 and she wants to come clean.

Step 1: Compute tax on updated income. Under the FY 2024-25 new regime slabs (which her ITR-U must use because the regime election cannot be switched at this stage), her net taxable income is Rs 14,25,000. The slab arithmetic:

You can replicate this on the Oquilia income-tax calculator or the dedicated new regime calculator, both of which default to FY 2024-25 slabs when the AY toggle is set to 2025-26.

Step 2: Net off TDS and self-assessment tax. Priya's TDS for the year was Rs 1,20,000 (captured in Form 26AS). Balance tax payable before interest is Rs 1,30,000 minus Rs 1,20,000, that is Rs 10,000.

Step 3: Compute Section 234A interest. Interest under 234A runs at 1% per month (or part thereof) from 1 August 2025 (the day after the original due date) until the date of ITR-U filing. From 1 August 2025 to 14 May 2026 is 10 months counting part months. The 234A interest is computed on the net tax liability, here Rs 10,000.

234A interest = 1% multiplied by 10 multiplied by Rs 10,000 = Rs 1,000.

Sections 234B and 234C may also kick in where advance-tax shortfalls exist; for a fully TDS-covered salaried profile they are typically nil. The Section 234F late-filing fee of Rs 5,000 still applies because her income exceeds Rs 5 lakh.

Step 4: Apply the Section 140B escalator. Priya is filing in May 2026, which falls within 12 months from the end of AY 2025-26 (31 March 2026). The bracket is 25%.

Additional tax = 25% multiplied by (tax + interest under 234A/B/C) = 25% multiplied by (Rs 10,000 + Rs 1,000) = Rs 2,750.

Step 5: Total ITR-U liability.

Priya generates a self-assessment challan (Challan 280, with minor head "Updated Return") for Rs 18,750, validates the BSR-code-and-CIN combination on her ITR-U form, ticks "return previously not filed" as the reason and submits. The portal will reject the submission if any of the disqualifications above apply, for example if a Section 143(2) notice has been issued, so it is wise to verify the "Proceedings" tab on incometax.gov.in before filing.

The cost of delay. Had Priya waited a year longer to May 2027, her additional-tax rate would double from 25% to 50%, and 234A interest would accumulate for another 12 months (about Rs 2,200 in total). The total liability would grow from Rs 18,750 to roughly Rs 23,300, about 24% higher even though the headline rate has doubled. The percentage hit becomes far more punitive for higher-income filers, where balance tax can run into lakhs.

For taxpayers who realise the omission within the original Section 139(5) window (before 31 December of the AY), a revised return is the better route, it carries no Section 140B additional tax. ITR-U is the fallback when Section 139(5) has closed. For arithmetic errors in an already-processed return, Section 154 rectification is the cheaper instrument; it has no additional tax at all.

If the omission relates to claiming the wrong regime, ITR-U cannot help, the regime election is locked once the original return is processed. And ITR-U cannot be used to claim a fresh deduction such as the Section 24(b) home loan interest cap if doing so would reduce tax. It can only be used to declare income or correct entries that increase liability.

FAQ

Can I file ITR-U to claim a refund I missed in my original return?

No. The proviso to Section 139(8A) explicitly bars an updated return that results in a refund or increases an existing refund. The instrument is meant to enhance, not reduce, the exchequer's collection. If the missed refund is purely arithmetic, say a TDS credit not picked up, explore Section 154 rectification or a condonation-of-delay petition under Section 119(2)(b) addressed to the jurisdictional CCIT or PrCCIT.

What if I have already received a scrutiny notice under Section 143(2) for that AY?

ITR-U is unavailable. Section 139(8A) bars the route where any assessment, reassessment or revision proceeding is pending or completed for the AY. The same disqualification applies if a Section 132 search or Section 133A survey has occurred for that period. Cooperate with the scrutiny instead and consider a Section 270AA immunity application if the conditions are met.

Does the 48-month window apply retrospectively to AY 2021-22?

The 48-month window came into force on 1 April 2025 via Finance Act 2025. AY 2021-22 had its 48-month window closing 31 March 2026, that window has now expired. As of May 2026, AY 2022-23 is the earliest reachable year, with its window closing 31 March 2027. Practically, the 70% additional-tax bracket applies, which makes the economics of a stale AY 2022-23 update viable only for very specific disclosures.

What reasons can I tick on the ITR-U form?

The form (notified vide CBDT Notification 48/2022 with subsequent updates) lists: return previously not filed; income not reported correctly; wrong heads of income chosen; reduction of carry-forward loss; reduction of unabsorbed depreciation; reduction of tax credit under Section 115JB or 115JC; wrong rate of tax; and "others". You may tick more than one reason on the same return.

Can I claim a fresh deduction under Chapter VI-A in ITR-U?

Only if doing so does not reduce the tax already determined. Practically, ITR-U is filed because additional income surfaces, and the resulting tax usually exceeds the deduction benefit, so the filing is valid. If the deduction alone would reduce tax, ITR-U is barred. Always compute the net position before filing.

Is HRA exemption claimable for the first time via ITR-U?

If you missed HRA exemption in your original ITR and the HRA exemption under Section 10(13A) read with Rule 2A would reduce your tax, ITR-U cannot help. You may pursue a Section 119(2)(b) condonation request instead, but the threshold for condonation is high, typically genuine hardship and timely application.

How is the additional tax different from a Section 270A penalty?

Section 140B additional tax is a flat percentage (25% to 70%) of tax plus interest, levied at filing time on a voluntary basis. Section 270A under-reporting penalty is 50% of tax on under-reported income (200% for misreporting) and is levied during assessment after a notice. Filing ITR-U voluntarily generally pre-empts a Section 270A penalty for the same disclosure, but the disclosure must be complete and the resulting tax paid in full before the return is uploaded.