GST compliance calendar 2026 for online sellers
Never miss a filing. Here are the recurring GST and tax dates every online seller should put on the calendar.
Missed deadlines mean late fees and interest. This calendar gathers the recurring dates online sellers care about so you can set reminders once and stay clear.
Monthly GST dates
| Return | Typical due date |
|---|---|
| GSTR-1 (monthly filers) | 11th of next month |
| GSTR-3B (monthly filers) | 20th of next month |
| GSTR-1 (QRMP, quarterly) | 13th after quarter |
| PMT-06 (QRMP tax) | 25th of next month |
Quarterly & annual
- QRMP GSTR-3B: 22nd/24th after the quarter (state-dependent).
- GSTR-9 annual return: by 31 December for the prior year (above threshold).
- GSTR-9C reconciliation: where applicable.
Income-tax dates for sellers
- Advance tax: 15 Jun, 15 Sep, 15 Dec, 15 Mar.
- ITR filing: as notified for the assessment year.
- TDS/TCS reflections: reconcile monthly via 26AS/AIS.
A simple routine
- Reconcile marketplace reports early each month (MTR guide).
- File GSTR-1, then GSTR-3B, before their dates.
- Fund advance tax each quarter.
- Keep every state GSTIN current.
Multi-state sellers
Each GSTIN files separately. As you follow the scaling playbook, keep one consolidated calendar across all states.
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When is GSTR-3B due?
For monthly filers, typically the 20th of the following month. QRMP filers file quarterly with monthly tax via PMT-06.
What are the advance-tax dates?
15 June, 15 September, 15 December and 15 March, in cumulative instalments.
Do due dates ever change?
Yes. Extensions happen and dates vary by scheme and state, so confirm each period and file early when unsure.
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