Update (5 November 2026): the CBIC circulars and notifications of 26–27 October 2026 do not change GSTR-1, GSTR-3B or GSTR-9 due dates. Next key dates: advance tax 3rd instalment 15 December 2026; GSTR-9/9C and belated/revised ITR 31 December 2026; TDS/TCS returns for Q3 31 January 2027.
Quick answer: Missing a compliance deadline in India can mean late fees, interest, and in some cases loss of input tax credit or penalty notices. This guide lists the key recurring GST, TDS, and Income Tax deadlines businesses and individuals need to track through the rest of 2026, so you never miss a filing.
Why Tracking Deadlines Matters
Tax compliance in India runs on a mix of monthly, quarterly, and annual deadlines across GST, TDS, and Income Tax. Missing even one can trigger:
- Late filing fees (per day, per return, in some cases)
- Interest on unpaid tax liability
- Loss of input tax credit under GST if returns aren’t filed on time
- Notices and scrutiny from the department
Most of this is entirely avoidable with a simple compliance calendar and a reminder system.
Monthly GST Deadlines
- GSTR-1 (outward supplies) — 11th of the following month (monthly filers) or quarterly under QRMP scheme
- GSTR-3B (summary return & tax payment) — 20th of the following month (staggered dates apply for some states under QRMP)
- CMP-08 (composition scheme taxpayers) — 18th of the month after each quarter
Quarterly & Half-Yearly TDS Deadlines
- TDS payment — 7th of the following month (30th April for March deductions)
- TDS return (Form 24Q/26Q/27Q) — 31st of the month following each quarter (Q2 FY26-27: due 31st October 2026)
- TDS certificates (Form 16/16A) — issued within 15 days of the TDS return due date
Income Tax Deadlines (FY 2025-26 / AY 2026-27)
- Advance tax instalments — 15th June, 15th September, 15th December, and 15th March each financial year
- ITR filing for non-audit taxpayers — typically 31st July, though this has seen extensions in recent years; always confirm the current year’s notified date
- ITR filing for audit cases — typically 31st October
- Tax audit report filing (Form 3CD) — typically 30th September
ROC & Company Compliance Deadlines
- AOC-4 (financial statements filing) — within 30 days of the AGM
- MGT-7/MGT-7A (annual return) — within 60 days of the AGM
- DIN KYC (DIR-3 KYC) — 30th September annually for all directors
What Happens If You Miss a Deadline?
Consequences vary by filing type, but generally include a late fee calculated per day of delay, interest on any tax due, and in GST’s case, potential blocking of input tax credit until the return is filed. Directors who miss DIN KYC face deactivation of their DIN until it’s completed with a late fee.
Note: Deadlines are subject to government notifications and extensions. This calendar reflects standard due dates as of 2026; always confirm specific dates for your filing with your CA before the due date.
Related: see our full guide on GST services.