BillmanQuick answer: Monthly filers file GSTR-1 by the 11th of the next month. Quarterly (QRMP) filers file by the 13th of the month after the quarter. Check B2B GSTINs, HSN codes and credit notes before you file.
What is GSTR-1?
GSTR-1 is the return of your outward supplies — every sale you made in the period. Your buyers’ input tax credit depends on it, so B2B details must be correct.
Due dates
| Filing type | Who | Due date |
|---|---|---|
| Monthly | Turnover above ₹5 crore, or chosen monthly | 11th of the next month |
| Quarterly (QRMP) | Turnover up to ₹5 crore who opt in | 13th of the month after the quarter |
Dates can be extended by government notification — check gst.gov.in.
Checklist before you file
- Every B2B invoice has the buyer’s correct GSTIN and state
- HSN codes on invoices (4 digits up to ₹5 crore turnover, 6 digits above)
- Credit notes and sales returns entered in the same period
- Cancelled invoices marked as cancelled, not deleted
- Totals in GSTR-1 match your sales register
💡 Late filing attracts a late fee per day and blocks your buyers’ credit. File on time even if there were no sales (a nil return).
How Billman helps
Billman builds GSTR-1 as you bill, flags wrong GSTINs and missing HSN codes before you file, and exports the GSTR-1 JSON for the GST portal.
FAQ
What happens if I file GSTR-1 late?
A late fee is charged for each day of delay, and your buyers may not get input tax credit on time.
Do I file GSTR-1 if I had no sales?
Yes. File a nil return for the period.
Get GSTR-1 ready as you bill
Billman does GST, e-way bills and GSTR-1 for you — even offline.