The Monthly GST Filing Checklist We Use

Why filings go wrong

Late or mismatched GST filings are almost always a process problem, not a knowledge problem. The businesses that stay clean aren't smarter about GST — they run the same short checklist every month, without exception.

Reconcile before the month closes

Reconcile every sales invoice against your books before the month closes. Match input tax credit claims against GSTR-2B — the auto-populated statement from your suppliers' filings — rather than trusting your own purchase register alone. Mismatches here are the single biggest source of GST notices.

The two dates that matter most

File GSTR-1 by the 11th of the following month, and GSTR-3B by the 20th. Build in a buffer before each — don't file on the deadline itself. Generate e-way bills and e-invoices in real time as transactions happen, not in a batch at month-end.

A quarterly check catches what monthly filing misses

Do a quarterly reconciliation between what you've filed and what your books actually show. Small mismatches compound if left unchecked for two or three quarters, and become much harder to explain to a notice than they would have been to fix in month one.

A worked example

A small D2C seller files GSTR-3B on time every month but skips the GSTR-2B match, trusting their own purchase log instead. Eight months in, a supplier's late filing creates a ₹40,000 ITC mismatch the seller never noticed — because they were checking the wrong number against the wrong number. The fix took an afternoon; catching it eight months earlier would have taken ten minutes.