GST due dates calendar — every return, every month
Pick a return period and see every GST filing deadline that applies to you.
| Form | Who files it | Period | Due date | If you miss it |
|---|---|---|---|---|
| GSTR-1 | Monthly filers (turnover > ₹5 crore or opted monthly) | August 2026 | 11 Sept 2026 | ₹50/day (₹20/day for nil), max ₹10,000 |
| IFF (optional) | QRMP taxpayers uploading B2B invoices | August 2026 | 13 Sept 2026 | No late fee — optional facility |
| GSTR-3B | Monthly filers | August 2026 | 20 Sept 2026 | ₹50/day (₹20/day nil) + 18% p.a. interest on tax |
| PMT-06 | QRMP taxpayers — monthly tax deposit | August 2026 | 25 Sept 2026 | 18% p.a. interest on shortfall |
| GSTR-5 / 5A | Non-resident & OIDAR service providers | August 2026 | 13 Sept 2026 | ₹50/day, max ₹10,000 |
| GSTR-6 | Input Service Distributors | August 2026 | 13 Sept 2026 | ₹50/day, max ₹10,000 |
| GSTR-7 / 8 | TDS deductors / e-commerce TCS collectors | August 2026 | 10 Sept 2026 | ₹50/day, max ₹2,000 |
Dates shown are the standard statutory due dates. CBIC occasionally extends them by notification for specific states or periods — check before relying on an extension.
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The GST calendar in plain English
Most registered businesses live by two dates each month: the 11th for GSTR-1 (your outward sales statement) and the 20th for GSTR-3B (your summary return and tax payment). Miss the 11th and your buyer cannot see the invoice in their GSTR-2B, which means they cannot claim input credit — that is usually a bigger problem than the late fee.
If your turnover is up to ₹5 crore you can opt into QRMP and file quarterly instead, paying tax monthly through PMT-06 by the 25th. Composition dealers file CMP-08 quarterly by the 18th and an annual GSTR-4.
What happens when you miss a due date
Two separate charges apply. Late fee accrues per day of delay — ₹50 a day for a return with tax and ₹20 a day for a nil return, subject to a cap based on turnover. Interest runs at 18% per annum on any tax you paid late, and it is calculated day-wise on the net cash liability.
There is also a compounding risk: GSTR-1 cannot be filed for a later period until earlier ones are done, and a pending GSTR-3B blocks e-way bill generation after two consecutive periods. That is how a small delay turns into stalled shipments.
Frequently asked questions
What is the GSTR-3B due date?
The 20th of the following month for monthly filers. QRMP taxpayers file quarterly by the 22nd or 24th depending on their state group, and pay tax monthly via PMT-06 by the 25th.
Can I file GSTR-1 after the due date?
Yes, with a late fee of ₹50 per day (₹20 for nil), capped by turnover. But your customer's input tax credit is delayed until you do, so most buyers chase this hard.
Who has to file GSTR-9?
Registered taxpayers with aggregate annual turnover above ₹2 crore must file GSTR-9, and above ₹5 crore must also file the GSTR-9C reconciliation. The due date is 31 December after the financial year ends.