ITR AY 2026-27: Complete Income Tax Compliance Calendar Every Taxpayer Should Follow
As the income tax filing season gathers momentum, taxpayers must keep a close watch on several important statutory deadlines throughout the financial year. Whether you are a salaried employee, self-employed professional, business owner, or tax deductor, meeting these due dates is essential to remain compliant with the Income Tax Act, 2025.
Failure to comply with prescribed timelines can result in interest, late filing fees, and unnecessary tax disputes. Planning your tax obligations well in advance can help you avoid last-minute complications and ensure seamless compliance.
1. Advance Tax Instalment Due Dates
Taxpayers whose estimated tax liability requires payment of advance tax must ensure timely payment in four instalments during the financial year.
Advance Tax Schedule
- 15 June
- 15 September
- 15 December
- 15 March
Missing or delaying any instalment may attract interest under the Income Tax Act, 2025.
Interest under Section 424
Interest may be levied when the total advance tax paid is less than 90% of the assessed tax. The interest is calculated at 1% per month or part of a month on the outstanding amount until the liability is discharged.
Interest under Section 425
Where taxpayers fail to pay the prescribed instalments or pay a lower amount than required on each due date, interest for deferment of advance tax may also become applicable at 1% per month for the prescribed period.
These provisions broadly correspond to Sections 234B and 234C of the Income-tax Act, 1961.
2. 31 July 2026 – Due Date for Filing ITR by Non-Audit Taxpayers
For most salaried individuals, pensioners, and other taxpayers who are not required to get their accounts audited, the due date for filing the Income Tax Return (ITR) for Assessment Year 2026-27 is 31 July 2026.
Filing the return before the due date offers several benefits, including:
- Avoidance of late filing fees
- Timely processing of refunds
- Reduced interest liability on unpaid taxes
- Eligibility to carry forward eligible losses wherever permitted
Missing this deadline may lead to additional compliance costs and restrictions under the Act.
3. 31 August 2026 – Due Date for Certain Business and Professional Taxpayers
Certain taxpayers having business or professional income and filing ITR-3 or ITR-4, who are not subject to tax audit, may have a filing due date of 31 August 2026.
Since the applicable due date depends upon the nature of income and statutory requirements, taxpayers should carefully determine the correct filing deadline applicable to their case.
4. 30 September 2026 & 31 October 2026 – Tax Audit and Return Filing
Taxpayers whose accounts are required to be audited under the Income Tax Act should complete the audit process well before the filing deadline.
Generally:
- 30 September 2026 – Due date for furnishing the Tax Audit Report.
- 31 October 2026 – Due date for filing the Income Tax Return for audit cases.
Before filing the return, taxpayers should reconcile:
- Books of account
- Form 26AS
- Annual Information Statement (AIS)
- Taxpayer Information Summary (TIS)
- Tax Audit Report
- TDS and TCS credits
Proper reconciliation helps minimize notices and processing delays.
5. 31 December 2026 – Last Date for Filing a Belated Return
If a taxpayer misses the original due date for filing the Income Tax Return, a Belated Return may generally be filed up to 31 December 2026, subject to the provisions of the Income Tax Act, 2025.
Although this facility provides an additional opportunity to comply, taxpayers may still be liable for:
- Late filing fees
- Interest on outstanding tax
- Certain restrictions under the Act
Therefore, filing within the original due date remains the preferred option.
6. 31 March 2027 – Final Date to File a Revised Return
A significant relief under the Income Tax Act, 2025 is the extension of the time limit for filing a Revised Return.
For Assessment Year 2026-27, taxpayers may revise an already filed return up to 31 March 2027, which marks the end of the relevant assessment year.
This extended timeline enables taxpayers to:
- Correct reporting errors
- Declare omitted income
- Rectify incorrect claims
- Update tax computations
- Improve overall tax compliance
However, taxpayers should avoid unnecessary delays and revise the return promptly after identifying any mistakes.
Conclusion
Income tax compliance is not limited to filing the Income Tax Return alone. Taxpayers should monitor the entire compliance calendar, including advance tax payments, audit reporting, and return filing deadlines.
Maintaining proper books of account, reconciling tax records in advance, and filing returns within the prescribed timelines can significantly reduce compliance risks while avoiding interest, penalties, and unnecessary litigation.
A proactive approach towards these important dates will ensure smooth tax compliance throughout Assessment Year 2026-27.
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