Made a mistake in an old return? The ITR-U updated-return window under section 139(8A) now runs 48 months

Filed a return two years ago and only now spotted the fixed-deposit interest you forgot to declare? Since the Finance Act 2025, you have far longer to put it right. The updated-return facility under section 139(8A) of the Income-tax Act 1961 - filed on Form ITR-U - now allows corrections up to 48 months from the end of the relevant assessment year, double the 24-month ceiling that applied when the facility was introduced by the Finance Act 2022 with effect from 1 April 2022.

The Income Tax Department's e-filing help pages confirm that an updated return "may be filed within forty-eight months from the end of the financial year succeeding the relevant tax year" (incometax.gov.in). The trade-off is an additional-tax charge under section 140B that now rises to 70% of the extra tax and interest for the final 12-month slice of that window. This piece sets out what the section permits, works through a numeric example, and lists the errors that get ITR-U filings rejected in processing or flagged in scrutiny.

What the Section Says

Section 139(8A), inserted by the Finance Act 2022, lets any person furnish an updated return whether or not they had already filed an original return under section 139(1), a belated return under section 139(4), or a revised return under section 139(5) for that year. The Finance Act 2025 extended the outer limit from 24 months to 48 months from the end of the relevant assessment year. For assessment year 2023-24 (financial year 2022-23), whose assessment year ended on 31 March 2024, an ITR-U can therefore be filed up to 31 March 2028.

The point of the facility is voluntary compliance, so it always costs more than filing on time. The additional income-tax under section 140B is charged as a percentage of the aggregate of the additional tax and the interest payable, and that percentage climbs with each 12-month bracket you cross:

The first two brackets (25% and 50%) have applied since the facility began in 2022; the 60% and 70% brackets were added by the Finance Act 2025 alongside the extension of the window to 48 months. The additional tax is over and above the normal tax on the omitted income, the health and education cess of 4%, and any interest already due under sections 234A, 234B and 234C.

The updated return is barred in several situations regardless of where you stand against the 48-month clock. Section 139(8A) does not permit an ITR-U that is a return of loss, that reduces the total tax liability declared in an earlier return, or that results in or increases a refund. You may furnish only one updated return per assessment year. Filing is also blocked where a search under section 132, a survey under section 133A (other than section 133A(2A)), or a requisition under section 132A has been initiated against you, or where an assessment, reassessment, recomputation or revision is pending or has been completed for that year. The Finance Act 2025 added a further restriction: where a notice under section 148A has been issued after 36 months from the end of the relevant assessment year, no ITR-U may be furnished for that year, unless the assessing officer passes an order under section 148A(3) holding that it is not a fit case for reopening. You can confirm the statutory text of both sections at indiacode.nic.in.

Worked Example

Take Meera, a salaried professional in the 30% slab for assessment year 2024-25 (financial year 2023-24). That assessment year ended on 31 March 2025, so her four brackets run to 31 March 2026 (25%), 31 March 2027 (50%), 31 March 2028 (60%) and 31 March 2029 (70%). In September 2026 - roughly 18 months after 31 March 2025, and so inside the 12-to-24-month bracket - she realises she never declared Rs 3,00,000 of freelance and interest income.

Her additional income-tax is Rs 90,000 (30% of Rs 3,00,000) plus 4% cess of Rs 3,600, giving Rs 93,600. Assume interest under sections 234B and 234C works out to Rs 6,400 for the delay (interest runs at 1% a month, so the exact figure depends on the months elapsed; treat this as illustrative). The aggregate of tax and interest is therefore Rs 1,00,000, and because she is filing in the 12-to-24-month window, section 140B levies a further 50% on that aggregate.

Had Meera filed the same correction before 31 March 2026 she would have paid 25% - only Rs 25,000 of section 140B tax, for a total of Rs 1,25,000. Had she delayed into the 24-to-36-month bracket, the charge would jump to 60% (Rs 60,000). The arithmetic is blunt: every 12 months of delay adds another slab of the aggregate, so fixing the return the moment you spot the error is the cheapest option. Size the tax on the omitted income first using the Oquilia income-tax calculator, and if the omission is capital gains rather than salary, the capital-gains calculator gives you the base figure to feed in. The whole 140B liability must be paid as self-assessment tax before you upload the ITR-U - the return is treated as defective if proof of payment is not furnished.

Common Mistakes

The single most common rejection is trying to use ITR-U to claim money back. Because section 139(8A) forbids any updated return that produces or increases a refund or reduces the tax already declared, an ITR-U can only ever be used to report more income and pay more tax. If your correction lowers your liability, ITR-U is the wrong route; a rectification under section 154, or a revised return under section 139(5) while it is still open (up to 31 December of the assessment year), may apply instead.

The second trap is the loss return. You cannot file an ITR-U that declares a loss, and you cannot use it to carry a loss forward for the first time. If the original return already carried a loss forward, an updated return that reduces that loss is permitted, but one that creates or enlarges a loss is not - a distinction the utility validates on upload.

A third error is forgetting that the section 140B tax is charged on tax plus interest, not on the omitted income. In Meera's case the 50% applied to Rs 1,00,000, not to Rs 3,00,000, and the aggregate itself grows as interest under sections 234A, 234B and 234C accrues at 1% a month, so a two-year delay inflates both the base and the multiplier. Model the advance-tax and interest position before you file so there is no shortfall. Our explainer on how interest under sections 234B and 234C is charged works through that arithmetic.

Filing more than once is a fourth mistake. Only one updated return is allowed per assessment year, so a rushed ITR-U carrying a further error cannot simply be re-done. Finally, taxpayers often assume the 48-month window rescues very old years: it does not stretch backwards without limit. The window is 48 months from the end of the relevant assessment year, and years whose 48 months have already lapsed are closed. Where a year is genuinely time-barred for ITR-U, the only remaining route may be a condonation-of-delay application under section 119(2)(b), which the department decides case by case.

FAQ

How is the 48-month deadline calculated for a specific year?

Count 48 months from the end of the relevant assessment year. For financial year 2022-23 (assessment year 2023-24), the assessment year ended on 31 March 2024, so the ITR-U deadline is 31 March 2028. The Income Tax Department states the window as "forty-eight months from the end of the financial year succeeding the relevant tax year" (incometax.gov.in), which is the same date expressed through the assessment-year concept.

Can I get a refund by filing ITR-U?

No. Section 139(8A) expressly bars any updated return that results in a refund, increases a refund, or reduces the tax liability shown in an earlier return. ITR-U is a one-way route for declaring additional income and paying additional tax; it cannot be used to recover money from the department.

Do I have to pay the tax before filing?

Yes. The additional tax, the 4% cess, the interest and the section 140B charge must be paid as self-assessment tax before the ITR-U is uploaded, and the challan details must be entered in the return. An ITR-U filed without full payment is treated as defective and does not complete a valid updated return.

What is the additional tax if I file in the third year?

If you file after 24 months but within 36 months from the end of the relevant assessment year, section 140B charges 60% of the aggregate of additional tax and interest. If you file after 36 months but within 48 months, the charge rises to 70%. Both these brackets were introduced by the Finance Act 2025; before that the maximum was 50%.

Can I file ITR-U if I have received a scrutiny or reassessment notice?

No, not for that year. ITR-U is blocked where an assessment, reassessment, recomputation or revision is pending or completed, or where a search under section 132, a survey under section 133A or a requisition under section 132A has been initiated. The Finance Act 2025 also bars an ITR-U where a section 148A notice was issued after 36 months, unless a section 148A(3) order holds it is not a fit case for reopening.

Is ITR-U the same as a revised return?

No. A revised return under section 139(5) can be filed only up to 31 December of the assessment year and can raise or lower your tax, including claiming a refund. An updated return under section 139(8A) runs for 48 months but only ever increases tax, and always carries the section 140B additional charge. If you spot an error while the revised-return window is still open, the revised return is almost always cheaper.

How many times can I use ITR-U for one year?

Only once per assessment year. Once you have furnished an updated return for a given year you cannot file a second ITR-U for the same year, so reconcile your TDS in Form 26AS and the Annual Information Statement fully before you file to avoid leaving a further omission uncorrected.