Monthly
GSTR-1 — 11th; GSTR-3B — 20th of the following month. Some states/QRMP have 22nd/24th for 3B; confirm yours.
QRMP and annual
QRMP: quarterly GSTR-1/3B with monthly PMT-06. GSTR-9: 31 December after the financial year.
GSTR-1 — 11th; GSTR-3B — 20th of the following month. Some states/QRMP have 22nd/24th for 3B; confirm yours.
QRMP: quarterly GSTR-1/3B with monthly PMT-06. GSTR-9: 31 December after the financial year.
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This answer is general information for businesses, not tax advice. Tax rates, thresholds and forms change with each Finance Act — please confirm the current position for your own facts, or speak to us, before acting.