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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.

By the Launch My Office team · Updated 2026-06-22 · 6 min read

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

ReturnTypical 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

Income-tax dates for sellers

Dates can shift with extensions and your filing scheme (monthly vs QRMP). Confirm each period and, when in doubt, file early.

A simple routine

  1. Reconcile marketplace reports early each month (MTR guide).
  2. File GSTR-1, then GSTR-3B, before their dates.
  3. Fund advance tax each quarter.
  4. 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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Frequently asked questions

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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