If you missed this year’s original ITR deadline, you are far from alone, and more importantly, you are not out of options. You can still file what is called a belated return, but it comes with real costs attached, and a few consequences that are worth understanding clearly before you assume filing late is a simple, no-harm fix. Here is exactly where things stand.
What Exactly Is a Belated Return?
A belated return is simply an income tax return filed after the original due date, under Section 139(4) of the Income Tax Act. For FY 2025-26, which is Assessment Year 2026-27, you can file a belated return up to December 31, 2026. Beyond this date, filing becomes considerably more restrictive, which we will get to below.
What Penalty Will You Actually Pay?
Filing late triggers two separate costs, and it helps to understand both:
Late filing fee under Section 234F: Rs 1,000 if your total income is up to Rs 5 lakh, or Rs 5,000 if it exceeds Rs 5 lakh. This fee applies regardless of whether you owe any additional tax, with one exception: if your gross total income is below the basic exemption limit, this fee generally does not apply.
Interest under Section 234A: If you have any unpaid tax, interest is charged at 1 percent per month, or part of a month, from the original due date until the date you actually file.
What Do You Lose by Filing Late?
Beyond the direct financial cost, a belated return carries a real structural disadvantage: you lose the ability to carry forward certain losses to future years. Specifically, business losses and capital losses, whether short term or long term, cannot be carried forward if your return is filed late. There is one notable exception here worth remembering: loss from house property can still be carried forward even in a belated return, unlike business or capital losses.
If you were counting on offsetting this year’s stock market losses or business losses against future profits, filing late removes that option entirely for this year’s losses. This is often a far more expensive consequence than the late fee itself.
If you are due a refund, filing late can also mean a longer wait to actually receive it, and you may not receive interest on your refund for the period of delay that was caused by your own late filing.
Can You Still Revise a Belated Return?
Yes, and this is a common misconception worth correcting. A belated return is not locked in once filed. It can still be revised under Section 139(5) if you spot an error afterward. Following recent changes, the window to revise a return, whether originally filed on time or belated, has been extended to March 31, 2027, giving you meaningfully more room to fix mistakes than in previous years.
What Happens If You Miss December 31 Too?
If you miss even the belated return deadline, you are not completely locked out, but your only remaining option becomes an Updated Return, known as ITR-U, under Section 139(8A). This comes with a much steeper cost structure. Following recent changes, the window to file an ITR-U now extends to 48 months from the end of the relevant assessment year, but the additional tax you must pay rises the longer you wait:
- 25% of the additional tax and interest if filed within 12 months of the end of the assessment year
- 50% if filed within 24 months
- 60% if filed within 36 months
- 70% if filed within 48 months
There are important limitations to keep in mind here too. An ITR-U can only be used to declare additional income and pay more tax, never to claim or increase a refund, and never to reduce your previously reported income. You can also file only one ITR-U per assessment year, and it cannot itself be revised afterward. In short, ITR-U exists as a safety net for people who missed every earlier deadline, not as a routine filing option.
Does Filing Late Affect Your Tax Regime Choice?
This depends on your income type. If you have business or professional income and want to opt for the old tax regime, you generally need to file Form 10-IEA on or before the due date. Missing this means you may be restricted to the new tax regime for that year, even in a belated filing. If you do not have business or professional income, for instance if you are purely a salaried individual, you can generally still choose your preferred regime at the time of filing, even if your return is belated.
What Should You Do Right Now?
If you have not yet filed your return for FY 2025-26, the most sensible step is to file your belated return as soon as possible, rather than waiting until closer to December 31. Every additional month adds to your interest liability under Section 234A if you have unpaid tax, and there is no benefit to waiting. If you have already missed the July or August deadlines relevant to your filing category, treat December 31, 2026 as a hard, final line, since the alternative beyond that point involves materially higher costs through ITR-U.
Frequently Asked Questions
What is the last date to file a belated ITR for FY 2025-26?
The last date to file a belated return under Section 139(4) for FY 2025-26, which is Assessment Year 2026-27, is December 31, 2026.
What is the penalty for filing a belated ITR?
You will owe a late filing fee under Section 234F, which is Rs 1,000 if your total income is up to Rs 5 lakh, or Rs 5,000 if it exceeds Rs 5 lakh, along with 1 percent monthly interest under Section 234A on any unpaid tax.
Can I carry forward my stock market losses if I file a belated return?
No. Filing a belated return means you cannot carry forward business losses or capital losses, whether short term or long term, to future years. Loss from house property is the one exception that can still be carried forward.
Can a belated return be revised later if I find a mistake?
Yes. A belated return can be revised under Section 139(5). The window to revise a return has recently been extended to March 31, 2027.
What happens if I miss the December 31 belated return deadline too?
Your only remaining option becomes an Updated Return, ITR-U, under Section 139(8A), which carries an additional tax ranging from 25 percent to 70 percent of the extra tax and interest owed, depending on how long after the assessment year you file. ITR-U can only be used to report additional income, never to claim or increase a refund.
Will filing a belated return affect my choice between the old and new tax regime?
If you have business or professional income, you generally needed to file Form 10-IEA by the due date to opt for the old regime, and missing this may restrict you to the new regime. If you have no business income, you can typically still choose your preferred regime even while filing a belated return.
