The Income Tax Department has outlined important compliance milestones that every taxpayer should have marked on their calendar. Whether it’s the final instalment of advance tax in March or the last opportunity to revise an already-filed return, missing these dates can cost you far more than the tax itself. This guide breaks down every critical deadline in plain language so you can stay ahead of the curve.
📋 What Is Advance Tax — And Who Needs to Pay It?
Advance tax is essentially “pay-as-you-earn” income tax. Rather than settling your entire tax liability at the end of the financial year, the government requires eligible taxpayers to pay tax in instalments throughout the year. This keeps the government’s revenue flow steady and ensures taxpayers do not face a sudden large outgo in one shot.
You are required to pay advance tax if your estimated tax liability for the financial year exceeds ₹10,000 after deducting any TDS already deducted at source. This applies to salaried employees (if their TDS falls short), freelancers, self-employed professionals, business owners, and investors with capital gains or dividend income.
🗓️ Advance Tax Instalment Schedule for FY 2025–26
Advance tax for the Financial Year 2025–26 (Assessment Year 2026–27) is payable in four instalments. Each instalment is a cumulative percentage of your total estimated tax liability for the year.
The first instalment marks the beginning of the advance tax cycle. Taxpayers must pay at least 15% of their estimated annual tax liability by this date.
Cumulative payment must reach 45% of your total liability. If you underestimated in June, this is a good time to recalculate and top up.
Three-quarters of the total advance tax must be cleared by mid-December. Revise your income estimate if your earnings have changed significantly since June.
This is the most critical deadline. The entire advance tax liability — 100% — must be discharged by March 15, 2026. Missing this date will trigger interest under Sections 234B and 234C.
✏️ Revised Return: Extended Last Date to March 31
Made an error in your filed Income Tax Return? Forgot to include some income, or claimed the wrong deduction? Previously, the window to correct a filed return closed on 31 December of the assessment year. Under proposed changes, this deadline is being extended to 31 March of the assessment year — giving taxpayers nearly three additional months to set things right.
For FY 2025–26 (AY 2026–27), the last date to file a revised return would be 31 March 2027. This is a significant taxpayer-friendly move that reduces the pressure of rushing corrections before year-end.
Late Revision Fees Applicable
Filing a revised return after the original due date will attract a nominal fee under Section 139(8A). The fee structure is as follows:
up to ₹5 Lakh
above ₹5 Lakh
📊 ITR Filing Due Dates — AY 2026–27 at a Glance
Budget 2026 introduced a reform in ITR filing deadlines — instead of a single date for everyone, the due date now varies based on the ITR form applicable to you.
| Taxpayer Category | Applicable Form | Due Date |
|---|---|---|
| Salaried, pensioners, capital gains, dividends | ITR-1 / ITR-2 | 31 July 2026 |
| Professionals & non-audit business owners; Trusts | ITR-3 / ITR-4 | 31 August 2026 |
| Businesses requiring statutory tax audit | ITR-3 / ITR-5 / ITR-6 | 31 October 2026 |
| Transfer pricing / international transactions | ITR-3 / ITR-5 / ITR-6 | 30 November 2026 |
| Belated / late filing (with penalty) | All forms | 31 December 2026 |
| Revised return (proposed extended window) | All forms | 31 March 2027 |
⚠️ What Happens If You Miss These Deadlines?
Non-compliance with tax deadlines is not just an inconvenience — it can result in real financial losses. Here is a clear breakdown of the consequences:
| Default | Penalty / Interest | Legal Provision |
|---|---|---|
| Failure to pay advance tax on time | 1% interest per month on shortfall | Section 234B & 234C |
| Late ITR filing (belated return) | ₹1,000 – ₹5,000 late fee | Section 234F |
| Interest on unpaid tax after due date | 1% per month on outstanding amount | Section 234A |
| Late TDS return filing | ₹200 per day (no upper cap) | Section 234E |
| Non-filing of ITR | Loss of carry-forward of losses + possible scrutiny | Section 139 / 271F |
🛡️ Updated Return — A Second Chance (Up to 4 Years)
Even if you have missed both the original and the belated return deadlines, the Income Tax Act offers one more option: an Updated Return under Section 139(8A). This allows taxpayers to file or correct a return within 48 months (4 years) from the end of the relevant assessment year — though with additional tax payment.
For AY 2026–27, an updated return can be filed as late as 31 March 2031. However, the additional tax liability increases the longer you delay, making it beneficial to act sooner rather than later.
💡 Practical Tips to Stay Compliant
- Set calendar reminders for all four advance tax instalment dates well in advance.
- Review your income estimate quarterly — if income rises significantly, increase your advance tax payment to avoid a shortfall penalty.
- File your original ITR well before the due date to avoid last-minute technical glitches on the income tax portal.
- Double-check Form 26AS and AIS (Annual Information Statement) before filing to ensure all income and TDS details are accurately captured.
- Use the revised return facility generously — there is no stigma in correcting mistakes, and the fee is minimal compared to the penalties for errors.
- Consult a chartered accountant if you have complex income sources — capital gains, foreign assets, or business income — to avoid unintentional non-compliance.
Disclaimer: This article is intended for general informational purposes only and does not constitute professional tax, legal, or financial advice. Tax laws and deadlines are subject to change. Please consult a qualified Chartered Accountant or tax advisor before making any financial decisions. All deadlines mentioned are based on information available as of March 2026 and may be subject to government extensions or amendments.
