GST Due Date Calendar 2026-27
Free tool | Updated 8 November 2026
Choose how you file and see your next deadlines, month by month. Download them to your phone calendar with a reminder two days before each date.
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Late fee and interest, in short
| Item | What applies |
|---|---|
| Interest on late tax payment | 18% a year on the unpaid tax, from the day after the due date (Section 50) |
| Late fee, GSTR-1 and GSTR-3B | Per day of delay, at a lower rate for nil returns (Section 47 and notifications) |
| Late fee, GSTR-9 | Per day of delay, subject to a cap linked to turnover |
| Old returns | A return cannot be filed on the portal after three years from its due date |
Dates follow the GST return framework in force on 8 November 2026. The government can extend dates by notification, as it did for the March 2026 GSTR-3B, so always confirm before the deadline. This is general information, not advice.
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