GSTR-1 monthly due date: 11 Oct 2026
GSTR-1 · Regular taxpayers filing monthly (turnover above ₹5 crore or not opted for QRMP)
GSTR-1 reports your outward supplies (sales) for the month. It is due on the 11th of the following month for monthly filers. Under QRMP it is due on the 13th of the month after the quarter.
If you miss it
₹50 per day (₹20 for nil), capped at ₹2,000 to ₹10,000 by turnover
GSTR-1 feeds your customers' GSTR-2B, so a late GSTR-1 delays their input tax credit. Businesses that file late often get chased by buyers before they get chased by the department.
Since GSTR-1 is now locked for GSTR-3B auto-population, errors in GSTR-1 must be fixed through amendments in a later period. Check B2B invoices, credit notes and the HSN summary before filing.
Let us handle this filing
GSTR-1 and GSTR-3B Monthly
Regular taxpayers filing monthly
Before each due date
GSTR-1 monthly: questions
What is the GSTR-1 due date for monthly filers?
The 11th of the month following the tax period. For example, August 2026 sales are reported by 11 September 2026.
What is the GSTR-1 due date under QRMP?
The 13th of the month following the quarter. Optionally, B2B invoices for the first two months can be uploaded through IFF by the 13th of the next month.
Can GSTR-1 be filed after GSTR-3B?
No. GSTR-1 for a period must be filed before GSTR-3B for that period.