Missed the ITR Deadline? File a Belated Return by 31 Dec

Missing the ITR due date is a bit like missing the last local train out of Churchgate, because you can still get home, but the taxi costs more. For FY 2025-26, most salaried taxpayers had to file by 31 July 2026, and anyone who missed it now has a second window that shuts on 31 December 2026.

That window is the belated return under Section 139(4) of the Income Tax Act, 1961. Filing it before the year ends keeps your refund claim and compliance record intact, and it saves you from a far more expensive route later, so the next nine weeks matter more than they look.

What is a belated return and who can file it?

A belated return is an income tax return filed after the original due date under Section 139(1), but before 31 December of the assessment year or before assessment is completed, whichever comes first. For AY 2026-27, which covers income earned from April 2025 to March 2026, any individual who missed the deadline can file one on the e-filing portal using the usual ITR forms.

Business owners whose accounts need an audit are in a different position, because CBDT moved their due date to 21 November 2026. So this guide is for salaried and other non-audit taxpayers who missed 31 July.

How much does filing late actually cost?

The cost comes in two parts: a flat late fee under Section 234F and interest under Section 234A on any unpaid tax. The fee is Rs 1,000 if total income is up to Rs 5 lakh and Rs 5,000 above that, while interest runs at 1% for every month or part of a month on tax still payable after TDS and advance tax.

Charge	Who pays	Amount
Late fee (Section 234F)	Total income up to Rs 5 lakh	Rs 1,000
Late fee (Section 234F)	Total income above Rs 5 lakh	Rs 5,000
Interest (Section 234A)	Anyone with tax unpaid after TDS and advance tax	1% per month or part month

To put this in perspective, suppose a salaried professional earning above Rs 5 lakh has Rs 20,000 of tax left unpaid after TDS, perhaps on interest income or capital gains, and files on 15 December. Interest for August to December counts as five months at 1%, or Rs 1,000, so with the Rs 5,000 fee the delay costs Rs 6,000.

Notice that the fee stays flat whether you file in November or December, but the interest keeps ticking, so filing this week instead of next month does save a little.

Can you still choose the old tax regime in a belated return?

For most salaried individuals, no. The new tax regime is the default, and the option to pick the old regime has to be exercised in a return filed by the original due date under Section 139(1). So a belated return is filed under the new regime, even if your 80C investments, 80D health premiums, HRA and home loan interest would have made the old regime cheaper.

Of course, for many people this changes little, because under the FY 2025-26 new regime a resident with taxable income up to Rs 12 lakh pays no tax after the Section 87A rebate, and the Rs 75,000 standard deduction lifts that to Rs 12.75 lakh of salary. The people who lose are those with large deductions, such as a family claiming Rs 2 lakh of home loan interest along with Rs 1.5 lakh under 80C and Rs 25,000 under 80D.

Which losses can you no longer carry forward?

Under Section 80, business losses, speculative losses and capital losses from FY 2025-26 cannot be carried forward to future years if the return is filed late. They can still be set off against eligible income of the same year. Loss from house property is treated differently and can generally be carried forward for eight years, even in a belated return.

Type of loss	Carry forward in a belated return?
Short-term or long-term capital loss	No
Business loss (non-speculative)	No
Speculative loss, such as intraday trading	No
Loss from house property	Yes, up to 8 years

This hurts investors most, because if you sold equity funds or shares at a loss during FY 2025-26, that loss could have reduced tax on gains for up to eight years. Our guide on capital gains tax on equity mutual funds shows how much that offset can be worth.

How do you file a belated return step by step?

The process is the same as a regular return, with one extra choice of filing section and the fee paid upfront. Most salaried taxpayers can finish it in an hour if their documents are ready.

1. Log in to the income tax e-filing portal, choose AY 2026-27 and select Section 139(4) as the filing section.
2. Pick the right form: ITR-1 for simple salary and one house property, and ITR-2 if you have capital gains beyond what ITR-1 allows.
3. Download your AIS and Form 26AS and match TDS, bank interest, dividends and capital gains against your own records.
4. Pay any balance tax, the Section 234A interest and the Section 234F fee through e-Pay Tax as self-assessment tax, then enter the challan details in the return.
5. Submit and e-verify within 30 days using Aadhaar OTP or net banking, because an unverified return is treated as not filed.

What happens if you miss 31 December as well?

After 31 December 2026, the only route left is an updated return (ITR-U) under Section 139(8A), which can be filed up to 48 months from the end of the assessment year. It carries additional tax of 25% to 70% of the tax and interest due, depending on how late you file, and it cannot be used to claim a refund or lower your tax.

Clearly, a Rs 5,000 fee today is cheap compared with that, and it also spares you a notice when the department’s AIS shows income with no matching return.

Why file before the year runs out

To sum up, a belated return costs a flat fee plus modest interest, and in return it keeps your refund claim, your house property loss and your compliance record safe. Block an hour this weekend, download your AIS and file well before the last week of December, and then mark next year’s due date in your calendar so the old regime and your loss carry-forward stay available.

What else do people ask about belated returns?

Do I pay the late fee if my income is below the exemption limit?

No. Section 234F applies to people who were required to file, so if your total income is below the basic exemption limit and you were not otherwise obliged to file, no late fee is payable.

Can I claim a refund in a belated return?

Yes. Excess TDS can be claimed as a refund in a belated return, and it is processed after you file and e-verify, so the earlier you file, the sooner the money comes back.

Can I revise a belated return if I make a mistake?

Yes, a belated return can be revised within the time limit for revised returns, which is [NEEDS VERIFICATION: 31 December 2026 or 31 March 2027, sources conflict].

Will I lose the Section 87A rebate by filing late?

No. The rebate depends on your taxable income and the regime, so a resident filing a belated return under the new regime with taxable income up to Rs 12 lakh still gets it.