Missed the ITR Deadline? Belated Return under Section 139(4) Explained

Missed your income-tax return deadline? A belated return under Sec. 139(4) Income-tax Act lets you file late, usually with a fee and interest on unpaid tax. For FY 2025-26 / AY 2026-27, the statutory deadline is 31 December 2026, or completion of assessment, whichever is earlier. Filing late can restrict loss carry-forwards, deductions and tax-regime choices, even when you expect a refund. The Income-tax Act, 1961 applies to this year.

What is the deadline for a belated return under Sec. 139(4)?

You can file a belated return until three months before the assessment year ends, unless assessment is completed earlier.

For AY 2026-27, which ends on 31 March 2027, this makes 31 December 2026 the statutory cut-off under Sec. 139(4) Income-tax Act.

The original deadline under Sec. 139(1) Income-tax Act depends on your category. For a salaried individual ordinarily outside tax-audit requirements, the usual deadline is 31 July 2026. Audit and transfer-pricing cases have different deadlines. Check applicable CBDT extensions before calculating lateness.

An extension for one taxpayer category or assessment year does not automatically cover everyone.

How much does filing late cost?

Late filing can trigger a fee under Sec. 234F Income-tax Act, plus interest on unpaid tax and advance-tax shortfalls.

Charge	Provision	Amount or basis
Late-filing fee	Sec. 234F Income-tax Act	₹5,000; capped at ₹1,000 where total income does not exceed ₹5 lakh
Interest for delayed filing	Sec. 234A Income-tax Act	1% for each month or part of a month on the applicable unpaid tax balance
Advance-tax shortfall interest	Sec. 234B Income-tax Act	Generally 1% monthly, subject to the section’s conditions
Advance-tax instalment interest	Sec. 234C Income-tax Act	Generally 1%, calculated for the prescribed instalment periods

The late fee concerns taxpayers required to furnish a return. If your income is below the applicable basic exemption limit and no other filing requirement applies, a voluntary late return ordinarily does not attract this fee.

However, income below that limit does not guarantee exemption: mandatory-filing conditions can still apply. Also, the Sec. 87A rebate threshold is not the basic exemption limit. Having no tax payable after rebate does not necessarily remove the filing obligation or late fee.

Which benefits can you lose by filing late?

Late filing can restrict specified loss carry-forwards, income-linked deductions and access to the old tax regime.

Loss carry-forward: Sec. 139(3), read with Sec. 80 Income-tax Act, generally requires timely filing to carry forward business, speculation, specified-business and capital losses. Eligible current-year set-off is not automatically lost merely because filing is late.

House-property losses and unabsorbed depreciation are important exceptions to this timely-return restriction, although separate restrictions, particularly under the new regime, still apply.

Deductions: Sec. 80AC Income-tax Act makes timely filing necessary for deductions under Chapter VI-A, heading C, including eligible claims under Sec. 80-IA and Sec. 80-IAC Income-tax Act. Sec. 10AA Income-tax Act also has a timely-filing condition. Sec. 10A Income-tax Act should not be presented as an available deduction for this year: its tax-holiday period has ended.

Tax-regime choice: The new regime is the default under Sec. 115BAC Income-tax Act. Taxpayers with business or professional income generally must submit Form 10-IEA by the applicable Sec. 139(1) deadline to opt out. However, a valid earlier opt-out may continue, subject to switching rules, so every belated business return does not automatically become a new-regime return.

For taxpayers without business income, choosing the old regime must also meet the timely-return requirement under Sec. 115BAC(6) Income-tax Act.

How does late filing affect refund interest?

For refunds arising from TDS, TCS or advance tax, late filing generally shifts the refund-interest starting date to the return-filing date.

Under Sec. 244A Income-tax Act, a timely return can ordinarily earn interest on these refunds from 1 April of the assessment year. A belated return generally earns it only from the filing date, subject to statutory conditions.

Self-assessment-tax refunds have a different rule: interest generally starts from the later of payment or filing. Delays attributable to the taxpayer can also be excluded. Therefore, the statement that all refund interest starts from filing is too broad.

What does the extra cost look like in rupees?

A four-month filing delay can add ₹6,520 where the late fee is ₹5,000 and ₹38,000 remains unpaid throughout the delay.

Assume Kiran, a salaried employee, has ₹14,00,000 taxable income and ₹38,000 tax payable after TDS. His applicable deadline is 31 July 2026, with no extension. He files and pays on 10 November 2026.

• Sec. 234F fee: ₹5,000.
• Sec. 234A interest: 1% × ₹38,000 × four months, August to November = ₹1,520.
• Extra late-filing cost: ₹6,520.
• Total payment including outstanding tax: ₹44,520.

This isolates Sec. 234A interest and the filing fee. Any applicable Sec. 234B or Sec. 234C interest must be calculated separately.

If Kiran also incurred a ₹2,00,000 short-term capital loss on shares, any eligible same-year set-off should first be examined. The unabsorbed balance generally cannot be carried forward through a belated return. The loss is not necessarily “gone for good” in its entirety.

Can you correct a belated return or file after December?

A belated return can be revised within the statutory revision window, while filing afterwards requires a separate eligible route.

Under Sec. 139(5) Income-tax Act, a belated return containing an omission or wrong statement can be revised by 31 December 2026, or before completion of assessment, whichever is earlier.

After that window, an updated return under Sec. 139(8A) Income-tax Act may be available. The updated-return period is now 48 months from the end of the relevant assessment year, subject to eligibility.

Additional income-tax under Sec. 140B Income-tax Act is:

Filing period after the assessment year ends	Additional tax on the applicable aggregate of tax and interest
Within 12 months	25%
Beyond 12 months, within 24 months	50%
Beyond 24 months, within 36 months	60%
Beyond 36 months, within 48 months	70%

An updated return cannot be a loss return, reduce an earlier tax liability, or create or increase a refund. Other exclusions apply.

It is not the only possible route: eligible delayed refund or loss claims may require condonation under Sec. 119(2)(b) Income-tax Act. See our revised and updated returns guide.

How do you file a belated return correctly?

Select the correct assessment year and filing provision, reconcile your records, pay outstanding dues and verify the return promptly.

1. Log in to the income-tax e-filing portal and select AY 2026-27.
2. Choose the correct ITR form and Sec. 139(4), belated return.
3. Reconcile income with AIS, Form 26AS, Form 16/16A, bank records and investment statements.
4. Check losses, deductions and tax-regime eligibility.
5. Pay tax, interest and fees through e-Pay Tax, selecting self-assessment tax, minor head 300, and the correct year. This is the payment category traditionally associated with Challan ITNS 280.
6. Enter or confirm challan details, submit and e-verify within 30 days.

Delayed verification can affect the recognised filing date or validity, unless condonation is granted.

How SP & SC helps

SP & SC Legal and Taxation Services, Bengaluru, reviews your filing position and identifies the appropriate compliance route.

We assist with reconciliation, tax and interest calculations, loss treatment, regime eligibility, belated returns, updated returns and non-filing communications. Fees are a fixed quote after reviewing the case, agreed before work starts. Contact us to discuss your pending return.

Frequently asked questions

Do I pay a late fee if a refund is due?

Yes, if you were required to file and missed the applicable deadline. An unpaid fee may reduce the refund during processing.

Is filing mandatory below the basic exemption limit?

Sometimes. Sec. 139(1) Income-tax Act includes triggers such as foreign-travel expenditure exceeding ₹2 lakh, electricity expenditure exceeding ₹1 lakh and aggregate current-account deposits exceeding ₹1 crore. Other prescribed conditions also apply.

Does a nil-tax return escape interest and fees?

No unpaid tax may mean no Sec. 234A interest, but Sec. 234F fees can still apply where filing was mandatory.

What should I do about a non-filing notice?

Check its section, assessment year and response deadline immediately. A notice may require a specific response or return; do not assume ordinary belated filing alone resolves it.