What are the GST return due dates?

1. GSTR-1, monthly filers - due the 11th of the following month. (August's return is due 11 September.)

2. GSTR-1, quarterly (QRMP) filers - due the 13th of the month after the quarter ends. (Jul-Sep quarter → 13 October.) The optional IFF for months 1-2 closes on the 13th of the following month.

3. GSTR-3B, monthly filers - due the 20th of the following month.

4. GSTR-3B, quarterly filers - due the 22nd (southern & western states) or 24th (northern & eastern states) of the month after the quarter.

5. GSTR-9 annual return - due 31 December after the financial year ends.

6. Marketplaces file their GSTR-8 by the 10th of the next month - which is why your Meesho/portal TCS data for a month only appears after the 10th.

⚠️ Late filing attracts a late fee per day plus 18% p.a. interest on unpaid tax - and an unfiled GSTR-1 blocks your buyers' ITC. File a NIL return even for a zero-sales month.