GST Return Filing Deadlines Every Business Should Track in 2026

Missing a GST return deadline is one of the most common and most avoidable compliance failures we see, and it carries real cost: late fees, interest on outstanding tax, and in some cases, a block on filing subsequent returns or claiming input tax credit.

Most businesses need to track GSTR-1 (outward supplies), GSTR-3B (summary return and tax payment), and where applicable, the annual return GSTR-9. The exact frequency — monthly or quarterly under the QRMP scheme — depends on your turnover and the scheme you've opted into.

The safest approach is to maintain a compliance calendar mapped to your specific GSTIN(s) rather than relying on memory. Trigon Services tracks these deadlines for every client and files well ahead of due dates to leave room for corrections.