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Quick Snapshot
Filing an ITR is not just about paying tax. It is a formal declaration of your income to the government. Think of it like submitting a school report card. Even if you scored zero in one subject, the card still has to go in.
Here is the problem most people face. They think they only need to file if they have taxable income. That is wrong. Companies, firms, trusts, and individuals with foreign assets must file regardless of income level. For individuals, the basic rule is simple: if your income exceeds the basic exemption limit before deductions, you must file.
Consider this. Arjun earned Rs. 2.8 lakh in FY 2025-26, which is below the exemption limit. But he also held a fixed deposit in Singapore gifted by his NRI uncle. He must still file an ITR because of that foreign asset, regardless of his income amount.
Now the cost of missing the deadline. If you file late, you pay interest at 1% per month on unpaid tax, plus a late fee of up to Rs. 5,000. But the worse consequence is this: if you miss the filing deadline, you lose the right to carry forward business losses or capital losses against future income. That single consequence can cost you lakhs in future tax.
Who Must File an ITR?
Section 263(1) of the Income Tax Act, 2025 (corresponding to Section 139(1) of the 1961 Act) mandates filing for the following persons:
| Category | Must File If |
| Company | Always, regardless of income or loss |
| Firm | Always, regardless of income or loss |
| Individual / HUF / AOP / BOI | Total income exceeds the basic exemption limit (before Chapter VIII deductions) |
| Specified entities (trusts, funds etc.) | If income exceeds the basic exemption limit before Section 11 exemptions |
| Business Trust / Investment Fund | Always |
| Resident (other than RNOR) with foreign assets | Always, if holding foreign assets, foreign financial interest, or signing authority in foreign accounts |
| Person with a loss to be carried forward | Always, to preserve the carry-forward right |
| University / College / Specified Institution | Always, as applicable under the Act |
The “Regardless of Income” Rule
Certain persons must file even at zero income or zero tax [Section 263(1)(b)]. These include companies, firms, business trusts, investment funds, and residents with foreign assets or foreign signing authority. Not filing in these cases is a legal default even when no tax is payable.
ITR Due Dates for FY 2025-26
Section 263(1)(c) of the Income Tax Act, 2025, as substituted by the Finance Act, 2026 with effect from 1st April 2026 (corresponding to Section 139(1) of the 1961 Act), prescribes the following due dates:
| Category | Condition | Due Date |
| Assessee required to furnish transfer pricing report under Section 172 (including partners and spouses where Section 10 applies) | Transfer pricing provisions apply | 30th November |
| Company; assessee whose accounts must be audited under this Act or any other law; partner of an audit-required firm or spouse where Section 10 applies | Transfer pricing does not apply | 31st October |
| Assessee with business or profession income whose accounts are not required to be audited; partner of a non-audit firm or spouse where Section 10 applies | Transfer pricing does not apply | 31st August |
| Any other assessee | 31st July |
Reader note: The new Act introduces 31st August as a separate due date for business and profession assessees not requiring audit. Under the Income Tax Act, 1961, this category also had a 31st July deadline (same as salaried individuals). This is a change under the new law. Check carefully which category applies to you.
Quick summary for individuals:
- Salaried employee with no business income: 31st July
- Freelancer not requiring audit: 31st August
- Professional or business requiring tax audit: 31st October
- Transfer pricing or international transactions: 30th November
Belated Return
If you miss the due date, you can still file a belated return under Section 263(4) (corresponding to Section 139(4) of the 1961 Act) within nine months from the end of the relevant tax year, or before assessment completion, whichever is earlier.
For FY 2025-26, the last date for a belated return is 31st December 2026.
Revised Return
If you filed on time but discovered an error or omission, you can file a revised return under Section 263(5) (corresponding to Section 139(5) of the 1961 Act) within twelve months from the end of the relevant tax year, or before assessment completion, whichever is earlier.
For FY 2025-26, the revised return deadline is 31st March 2027.
Updated Return: The 4-Year Window
Section 263(6) of the Income Tax Act, 2025 (corresponding to Section 139(8A) of the 1961 Act) allows filing an updated return within 48 months from the end of the financial year succeeding the relevant tax year.
For FY 2025-26, the financial year succeeding the relevant tax year is FY 2026-27. The 48-month window runs from the end of FY 2026-27, meaning you can file an updated return until 31st March 2031.
When Can You NOT File an Updated Return?
You cannot file an updated return if:
- It results in a loss (except where a loss return was filed within the original due date and the updated return reduces that loss or converts it to income)
- It decreases your total tax liability
- It creates or increases a refund
- A search, survey, or requisition proceeding is pending or completed for that year
- You have already filed one updated return for that year
- Any assessment or reassessment is pending or completed for that year (except where filing under a Section 280 notice)
- Information from international tax agreements has been communicated to you for that year
- Prosecution proceedings have been initiated for that year
Additional Tax on Updated Returns
Filing an updated return carries a cost. You must pay additional income tax on the incremental tax and interest as follows [Section 266(5)]:
| When Filed | Additional Tax Rate |
| After the belated/revised return deadline but within 12 months from the end of the FY succeeding the relevant tax year | 25% of aggregate of tax and interest payable |
| After 12 months but within 24 months from the end of that financial year | 50% |
| After 24 months but within 36 months | 60% |
| After 36 months but within 48 months | 70% |
The reference point is the end of the financial year succeeding the relevant tax year, not the end of the tax year itself. For FY 2025-26, the reference point is 31st March 2027.
ITR Forms: Which One Applies to You?
CBDT prescribes ITR forms each year. The standard category mapping that continues under the new Act is as follows:
| ITR Form | Who Should Use It |
| ITR-1 (Sahaj) | Resident individuals with salary, one house property, other sources; income up to Rs. 50 lakh |
| ITR-2 | Individuals or HUF with capital gains, multiple house properties, or foreign income |
| ITR-3 | Individuals or HUF with business or profession income (maintaining regular books) |
| ITR-4 (Sugam) | Presumptive income under Section 58(2) or 61(2) of the new Act |
| ITR-5 | Firms, LLPs, AOPs, BOIs |
| ITR-6 | Companies other than those claiming exemption under Section 11 |
| ITR-7 | Trusts, political parties, and institutions filing under applicable provisions |
The exact forms are notified separately by CBDT each year.
Consequences of Late Filing
1. Late Filing Fee (Section 428(a), corresponding to Section 234F of the 1961 Act)
If you miss the due date, a fee is payable before filing:
| Total Income | Late Fee |
| Up to Rs. 5,00,000 | Rs. 1,000 |
| Above Rs. 5,00,000 | Rs. 5,000 |
2. Interest on Unpaid Tax (Section 423, corresponding to Section 234A of the 1961 Act)
If you have unpaid tax and miss the due date, interest accrues at 1% per month (or part of a month) on the outstanding tax amount. It runs from the day immediately after the due date until the date of actual filing.
Formula: Interest = 1% x Tax outstanding x Number of months
Example: Sunita had Rs. 30,000 in unpaid tax and filed 3 months late. Interest = 1% x Rs. 30,000 x 3 = Rs. 900. Small, but avoidable.
3. Loss of Carry Forward (Most Critical Consequence)
If you file after the Section 263(1) due date, you lose the right to carry forward:
- Business losses
- Speculation losses
- Capital losses (in most cases)
A business that made Rs. 5 lakh in losses this year could have offset Rs. 5 lakh of income next year, saving material tax. Filing late permanently destroys that right. No belated return, revised return, or updated return can restore the carry-forward benefit.
4. Disallowance of Certain Deductions
Filing beyond the due date results in disallowance of deductions under certain tax-holiday and incentive provisions under Chapter VIII of the Act [Section 270 read with relevant deduction sections].
5. Prosecution (Section 479, corresponding to Section 276CC of the 1961 Act)
Wilful failure to file attracts prosecution:
| Tax Evasion Amount | Punishment |
| Exceeds Rs. 50 lakh | Simple imprisonment up to 2 years, or fine, or both |
| Rs. 10 lakh to Rs. 50 lakh | Simple imprisonment up to 6 months, or fine, or both |
| Any other case | Fine only |
You are protected from prosecution if you subsequently file a belated return under Section 263(4) or an updated return under Section 263(6), or if the net tax payable after advance tax and TDS does not exceed Rs. 10,000 [Section 479(2)].
Practical Compliance Checklist
- If you are salaried with Form 16: File by 31st July. Cross-check Form 16 with your AIS before filing. All bank interest appears in your AIS and must be included in your return.
- If you are a freelancer or consultant: File by 31st August if below the audit turnover threshold, or 31st October if audit applies. Verify all TDS credits in your AIS before filing.
- If you missed the due date: File the belated return by 31st December. Pay the late fee and any interest along with it. Non-filing is always worse than late filing.
- If you found an error after filing on time: File a revised return within 12 months from year-end. No additional late fee applies for a revised return.
- If you have business losses to carry forward: File on time. This is urgent. Missing the due date permanently forfeits your right to carry those losses forward, and no later filing can restore it.
Filing your ITR is one of the simplest financial habits you can build. The forms are shorter than they look, the portal keeps improving, and the cost of not filing on time, in terms of interest, fees, and lost deductions, is almost always more than the effort of filing before the deadline. Start early, verify your AIS, and submit on time.
