If you miss the 31 July 2026 deadline for filing your return for FY 2025-26, you can still file — but it costs money, and the cost is not only the late fee everyone talks about. Here is the complete picture, in the order the charges actually hit you.
The short version: a late fee of ₹1,000 or ₹5,000 depending on your income, plus 1% a month interest on any unpaid tax, plus the loss of your right to carry certain losses forward. For most salaried people whose tax was already deducted at source, the damage is limited to the late fee. For anyone with tax still payable, the interest is where it gets expensive.
The late fee under Section 234F
This is the headline penalty and it is a flat amount, not a percentage.
If your total income is up to ₹5,00,000, the late fee is ₹1,000. If your total income is above ₹5,00,000, the late fee is ₹5,000. There is no middle tier and no proportional scaling — cross ₹5 lakh by a rupee and you pay the full ₹5,000.
One genuine relief: if your total income is below the basic exemption limit, meaning you were not required to file at all, no late fee applies even if you file after the deadline. People who file voluntarily to claim a refund on TDS often fall into this group.
The fee is charged when you file, not billed later. The portal computes it and adds it to your tax payable before it will let you submit.
Interest under Section 234A on unpaid tax
Section 234F is fixed. Section 234A is not, and this is the charge that grows.
If you have tax still payable after accounting for TDS and advance tax, you are charged 1% simple interest per month or part of a month on that unpaid amount, running from 1 August until the date you actually file. A part of a month counts as a full month, so filing on 2 September costs you two months of interest, not one and a bit.
The practical consequence is that delay is only cheap if you owe nothing. Someone with ₹80,000 of tax outstanding who files four months late pays roughly ₹3,200 in 234A interest on top of the ₹5,000 late fee. Someone whose employer already deducted the full TDS pays the ₹5,000 and nothing more.
Sections 234B and 234C may apply separately if you were required to pay advance tax and did not. These are advance-tax defaults rather than late-filing penalties, so they can apply even to people who file on time — but they compound the bill for those who file late with tax outstanding.
What you lose that is not money
This is the part most people discover a year later, and it can cost far more than the fee.
When you file a belated return, you lose the right to carry forward most losses to set against future income. Capital losses, business losses and speculative losses all fall away. Only loss from house property survives and can still be carried forward.
For an investor who booked ₹3 lakh of capital losses during the year and expected to offset them against next year's gains, that is a real, quantifiable loss of future tax relief — often tens of thousands of rupees, dwarfing the ₹5,000 fee.
You also generally lose the ability to opt for the old tax regime. The new regime is the default, and the choice to move to the old one is meant to be exercised in a return filed by the due date. If you have substantial HRA, 80C investments or home-loan interest that make the old regime better for you, filing late can quietly cost you that advantage. Because the mechanics here depend on whether you have business income and on the form you use, confirm your specific position on the income tax portal before assuming either way.
Finally, if you are due a refund, filing late means you receive less interest under Section 244A on it, since that interest generally runs from the date of filing when the return is belated rather than from the start of the assessment year.
The deadline after the deadline
Missing 31 July does not mean you have missed the year entirely.
A belated return for FY 2025-26 can be filed until 31 December 2026. A revised return, if you filed on time but got something wrong, has the same 31 December 2026 cut-off. Beyond that, an updated return (ITR-U) remains available for a longer window but carries substantial additional tax on top, so it is a last resort rather than a plan.
The rule of thumb is simple: file as soon as you realise you have missed it. The late fee does not increase with further delay, but the 234A interest does, month by month.
What to do this week if you have not filed
If the deadline has not yet passed, file now rather than reading further — the entire penalty regime above only starts once 31 July is behind you.
If it has passed, gather your Form 16, your AIS and Form 26AS from the portal, and your bank and capital gains statements, then file the belated return the same week. Check what tax is still outstanding before you file, because paying it reduces the 234A interest that keeps accruing. Our income tax calculator will tell you what you owe under each regime, and if you are unsure which form applies, our guide on which ITR form you should file walks through it.
One more thing people forget: filing is not finished until you e-verify, and you have only 30 days from submission to do it. An unverified return is treated as never filed, which means the late fee and interest keep running as though you had done nothing.
This article is general educational information based on the rules as they stand for AY 2026-27, not personalised tax advice. Late fees, interest rates and deadlines can be amended, and the government has extended filing deadlines in some past years. Always confirm the current position on incometax.gov.in before you file, and consult a qualified chartered accountant for anything complex.