Never miss a GST filing deadline again. Here is the complete month-by-month calendar for GSTR-1, GSTR-3B, GSTR-9, and CMP-08 due dates for FY 2025-26.
Monthly Filing Deadlines
GSTR-1 (Outward Supplies)
| Taxpayer Type |
Due Date |
| Monthly filers (turnover > ₹5 Cr) |
11th of next month |
| Quarterly filers (QRMP scheme) |
13th of month after quarter |
GSTR-3B (Summary Return)
| Taxpayer Type |
Due Date |
| Monthly filers |
20th of next month |
| Quarterly filers (Category I states) |
22nd of month after quarter |
| Quarterly filers (Category II states) |
24th of month after quarter |
2026 Key Dates
| Month |
GSTR-1 Due |
GSTR-3B Due |
| January 2026 |
11 Feb |
20 Feb |
| February 2026 |
11 Mar |
20 Mar |
| March 2026 |
11 Apr |
20 Apr |
| April 2026 |
11 May |
20 May |
| May 2026 |
11 Jun |
20 Jun |
| June 2026 |
11 Jul |
20 Jul |
Annual Returns
- GSTR-9 (Annual Return): Due 31 December after the financial year ends
- GSTR-9C (Reconciliation Statement): Same deadline, for taxpayers with turnover > ₹5 Cr
Late Filing Fees
| Return |
Fee per Day |
Maximum |
| GSTR-1 |
₹50 (nil return: ₹20) |
₹10,000 |
| GSTR-3B |
₹50 (nil return: ₹20) |
₹10,000 |
| GSTR-9 |
₹200 |
0.25% of turnover |
Tip: Enable SMS/email alerts on the GST portal to get deadline reminders automatically.