Every year, lakhs of people miss the July deadline. Sometimes Form 16 came late, sometimes a job switch made things messy, and sometimes life just got in the way. The good news is that missing 31 July is not the end of the road. The bad news is that the longer you wait, the more it costs, and some losses are permanent.
This guide explains exactly what a late return costs for FY 2025-26 (AY 2026-27), with four real examples in rupees. It also covers the old regime trap most articles skip and the exact steps to file before 31 December 2026.
What a belated return is
A belated return is simply an income tax return filed after the original due date under Section 139(1), but within the extra window that Section 139(4) allows. The law gives you until three months before the end of the assessment year, or until your assessment is completed, whichever comes first. For AY 2026-27, the assessment year ends on 31 March 2027, so the belated window closes on 31 December 2026.
Once filed and verified, a belated return is a valid return. It gets processed, refunds are issued, and it counts as compliance. It just comes with a few costs and lost benefits, which we cover below.
Key dates for FY 2025-26 (AY 2026-27)
| What | Date | Who it applies to |
|---|---|---|
| Original due date | 31 July 2026 | Salaried, pensioners and other non-business individuals (ITR-1, ITR-2) |
| Original due date | 31 August 2026 | Non-audit business or professional income, such as freelancers under 44ADA (new staggered date from Budget 2026) |
| Original due date | 21 November 2026 | Tax audit cases (extended by CBDT from 31 October) |
| Belated return deadline | 31 December 2026 | Everyone who missed their original due date |
| Revised return deadline | 31 March 2027 | Anyone correcting an original or belated return (fee applies after 31 Dec) |
| Updated return (ITR-U) | Up to 48 months from end of AY | Only to report extra income and pay extra tax |
No general extension was announced for the 31 July 2026 date for salaried individuals, so if you haven't filed yet, your return is belated.
What filing late costs you
There are five separate costs. Most people only know about the first one.
1. Late fee under Section 234F
| Your total income | Late fee |
|---|---|
| Up to ₹5,00,000 | ₹1,000 |
| Above ₹5,00,000 | ₹5,000 |
The fee is the same whether you file on 1 August or 31 December. It is paid along with self-assessment tax before you submit the return, and the portal won't let you submit without it. It applies even if your final tax is zero, as long as you were required to file, for example because your gross total income crossed the basic exemption limit.
2. Interest under Section 234A
If any tax is still unpaid after TDS and advance tax, you pay simple interest of 1% per month from 1 August 2026 until you pay. Any part of a month counts as a full month, so paying on 2 November costs the same interest as paying on 30 November. If you were also short on advance tax, Sections 234B and 234C interest apply separately, whether you file late or not.
3. Less interest on your refund
On-time filers get refund interest under Section 244A at 0.5% per month from 1 April of the assessment year. For a belated return, that interest only starts from the date you file. So a late refund is a smaller refund.
4. Losses can't be carried forward
If you booked a loss on shares, mutual funds, F&O or a business in FY 2025-26, a belated return cannot carry it forward to set off against future gains. Only a loss under "Income from house property" survives. For active traders, this is often the most expensive part of filing late.
5. You may be stuck in the new regime
This one surprises people most. It gets its own section below.
Check your exact tax before you pay the fee
Use the free Income Tax calculator to see what you owe under both regimes.
4 worked examples with real numbers
All figures are for FY 2025-26. The new regime slabs used are: 0 to ₹4 lakh nil, ₹4 to 8 lakh 5%, ₹8 to 12 lakh 10%, ₹12 to 16 lakh 15%, with a ₹75,000 standard deduction and the Section 87A rebate making income up to ₹12 lakh tax-free. Cess is 4%.
Example 1: Riya, salaried, zero tax, still pays ₹5,000
Riya earned a gross salary of ₹8,00,000. After the ₹75,000 standard deduction, her taxable income is ₹7,25,000, and the 87A rebate takes her tax to zero. Her employer deducted no TDS. She files on 15 November 2026.
- Tax payable: ₹0
- 234A interest: ₹0 (no unpaid tax)
- 234F late fee: ₹5,000, because her total income is above ₹5 lakh
Many people with zero tax assume a late return is free. It isn't. Riya would have paid nothing by filing in July.
Example 2: Amit, salaried with FD interest, ₹40,000 tax unpaid
Amit's employer deducted TDS on his salary, but he forgot about ₹2,50,000 of FD interest. After adding it and subtracting the bank's TDS, he still owes ₹40,000. He files and pays on 20 December 2026.
| Item | Amount |
|---|---|
| Balance tax | ₹40,000 |
| 234A interest (Aug, Sep, Oct, Nov, Dec = 5 months × 1%) | ₹2,000 |
| 234F late fee | ₹5,000 |
| Total to pay | ₹47,000 |
Had he filed in July, he would have paid ₹40,000. Filing late cost him ₹7,000. (If he was also short on advance tax, 234B interest is extra.) Waiting until January and using ITR-U instead would cost much more (see below).
Example 3: Neha, small income, refund of ₹12,000
Neha's total income is ₹4,60,000, and her bank deducted ₹12,000 TDS on interest. She is owed a full refund. She files on 30 November 2026.
- 234F late fee: ₹1,000 (income is ₹5 lakh or less)
- Refund: ₹12,000, but interest only runs from 30 November, not from 1 April. She loses roughly 8 months of 0.5% interest, about ₹480.
Her net loss is around ₹1,480. Small, but completely avoidable.
Example 4: Rahul, trader, loses a ₹1,20,000 loss forever
Rahul has a salary, and he booked a short-term capital loss of ₹1,20,000 on shares in FY 2025-26. He expected to set it off against gains next year. Because he is filing a belated return, the loss cannot be carried forward. If he makes ₹1,20,000 of short-term gains next year, he pays 20% tax on them, about ₹24,000 plus cess, that he could have saved.
The old regime trap
For FY 2025-26 the new regime is the default. To be taxed under the old regime, a salaried person has to choose it in a return filed by the original due date under Section 139(1). If you file a belated return, you generally can't choose the old regime, and your tax is worked out under the new regime.
That's fine for most people, since the new regime is better for many salaried incomes. It hurts people with big deductions. Take a salary of ₹15,00,000 with these deductions:
| Old regime | New regime | |
|---|---|---|
| Gross salary | ₹15,00,000 | ₹15,00,000 |
| HRA exemption | ₹2,00,000 | Not allowed |
| Standard deduction | ₹50,000 | ₹75,000 |
| 80C + 80D + 80CCD(1B) NPS | ₹2,25,000 | Not allowed |
| Home loan interest 24(b) | ₹2,00,000 | Not allowed |
| Taxable income | ₹8,25,000 | ₹14,25,000 |
| Tax with 4% cess | ₹80,600 | ₹97,500 |
Filed on time under the old regime, this person pays ₹80,600. Filed late, they are pushed into the new regime and pay ₹97,500. That's ₹16,900 extra, on top of the ₹5,000 late fee.
If you were planning to use the old regime, run both numbers before you file. The Income Tax calculator shows both regimes side by side, and the HRA calculator helps you see how much exemption you're giving up.
How to file a belated ITR, step by step
- Collect your documents. Form 16 (one from each employer if you switched jobs), Form 26AS, the AIS and TIS from the portal, bank interest certificates, and capital gains statements. Our Form 16 guide explains what to check.
- Work out your tax. Add every income, including FD and savings interest, which people often miss. Subtract TDS and any advance tax already paid.
- Pay tax, interest and late fee first. On the e-filing portal, go to e-File → e-Pay Tax, choose AY 2026-27 and "Self-Assessment Tax (300)". Enter the tax, the 234A interest and the 234F fee in their separate boxes, then pay by net banking, UPI or card.
- Start the return. Go to e-File → Income Tax Returns → File Income Tax Return, select AY 2026-27 and filing mode Online.
- Pick the right section. When asked for the filing section, choose 139(4) – Belated. Choosing 139(1) by mistake can get the return marked defective.
- Fill and check the pre-filled data. Match salary with Form 16 and TDS with 26AS. Enter your challan details from step 3 in the "Tax paid" schedule.
- Submit and e-verify within 30 days. Aadhaar OTP is the quickest. A return that isn't verified within 30 days is treated as not filed, and late verification counts as late filing.
Missed 31 December too? Your options
After 31 December 2026 you cannot file a belated return for FY 2025-26. What's left:
| Option | When it works | Cost |
|---|---|---|
| Updated return (ITR-U), Section 139(8A) | You have income to report and extra tax to pay | Tax + interest + 25% extra (within 12 months of AY end), rising to 50%, 60% and 70% for later years, up to 48 months |
| Condonation of delay, Section 119(2)(b) | You have a genuine refund claim and a real reason for the delay | Application to the tax department; approval is not automatic |
| Wait for a notice | Not an option | Tax, interest and a penalty of 50% of the tax on under-reported income (200% if it counts as misreporting) |
ITR-U cannot be used to claim a refund, report a loss or reduce your tax. So if you're owed money, 31 December is effectively your last chance to get it back easily.
Mistakes to avoid
- Thinking zero tax means no fee. See Riya in Example 1.
- Choosing section 139(1) instead of 139(4). The return can be treated as defective.
- Paying the fee under the wrong challan head. Use Self-Assessment Tax (300) and put the amount in the "Fee" box, not the "Tax" box.
- Forgetting to e-verify. Filing without verifying is the same as not filing.
- Ignoring AIS. The department already sees your FD interest, dividends and share sales. If your return leaves them out, expect a notice.
- Waiting for the last week. The portal is slow in late December, and a payment that fails on 31 December can push you into ITR-U territory.
Frequently asked questions
What is the last date to file a belated ITR for FY 2025-26 (AY 2026-27)?
31 December 2026, under Section 139(4). If the department completes your assessment before that, the window closes earlier, but for most individuals 31 December is the date that matters.
What is the penalty for filing ITR after 31 July 2026?
A late fee under Section 234F of ₹5,000, capped at ₹1,000 if your total income is ₹5 lakh or less. If you also have unpaid tax, Section 234A interest of 1% per month (part of a month counts as a full month) runs from 1 August until you pay.
Do I have to pay the late fee if I have no tax to pay or I am getting a refund?
Yes, if you were required to file (for example, because your gross total income crossed the basic exemption limit). The 234F fee depends on filing late, not on whether tax is due. You pay it before submitting the return.
Can I choose the old tax regime in a belated return?
Generally no. The option to stay in the old regime has to be exercised in a return filed by the original due date under Section 139(1). A belated return is taxed under the new regime, which can cost you money if you had large deductions like home loan interest, HRA and 80C.
Can I revise a belated return if I make a mistake?
Yes. After the Finance Act 2026 change, a belated return for AY 2026-27 can be revised up to 31 March 2027. A revision filed after 31 December 2026 attracts a fee under Section 234-I of ₹1,000 (income up to ₹5 lakh) or ₹5,000 (above ₹5 lakh).
Can I carry forward my stock market or business loss in a belated return?
No. Losses under capital gains and business heads cannot be carried forward if the return is filed after the due date. Only a loss under house property can still be carried forward.
Belated ITR kaise file karein agar 31 December bhi nikal gaya?
After 31 December 2026 you cannot file a belated return. If you owe extra tax, you can file an updated return (ITR-U) up to 48 months from the end of the assessment year, with 25% to 70% additional tax. ITR-U cannot be used to claim a refund or report a loss.
Will I get interest on my refund if I file a belated return?
Yes, but less of it. Refund interest under Section 244A runs from the date you actually file a late return, not from 1 April of the assessment year as it does for on-time filers.
Related reading
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