GST due dates

Under QRMP, GSTR‑3B is due on the 22nd for some taxpayers and the 24th for others — it depends on the state. Most calculators list both and leave it to you; this one works it out from your GSTIN.

All calculations happen in your browser — nothing is sent

GSTIN (only for the state — the first 2 digits are enough)

Scheme

Month

Due dates at a glance

Scheme	Return	Due
Regular monthly	GSTR-1	11th of the next month
Regular monthly	GSTR-3B	20th of the next month
QRMP	GSTR-1 (quarterly)	13th of the month after the quarter
QRMP	GSTR-3B (quarterly)	22nd or 24th of that month — by state group
QRMP	PMT-06 (challan)	Tax for the first TWO months of the quarter, 25th of the next month
Composition	CMP-08	18th of the month after the quarter

Two things that are often missed

PMT-06 is only for the first two months. Tax for the third (quarter-end) month is paid with the quarterly GSTR‑3B — there is no separate challan for that month.
PMT-06 is not a return, it is a payment challan. If it is late there is no late fee — interest applies.

What this tool does not do

It gives statutory due dates. If CBIC notifies an extension, it does not show up here automatically — and extensions are common in filing season. Check for notifications before relying on the last date.