Most GST notices don't allege wrongdoing — they point at a gap between two of your own returns. Understand what each one is, and the gaps stop being mysterious.
What each return actually is
- GSTR-1 — the outward register: what you billed your customers this period.
- GSTR-3B — the summary on which you actually pay: output tax, the input credit you claim, and the net cash paid.
- GSTR-2B — the credit statement the system builds from your suppliers' filings: the input tax credit you're entitled to.
The mismatches that draw a notice
- GSTR-1 vs 3B (outward): declared sales in 1 don't tie to the output tax paid in 3B — check this first; it's the most common trigger.
- GSTR-2B vs 3B (credit): you claimed more credit in 3B than 2B supports — usually a supplier who filed late or not at all.
- Timing: an invoice reported in a different period from when the credit was taken.
What to check first
Start with outward (1 vs 3B) — it's your own data and quickest to fix. Then reconcile credit (2B vs 3B): list the invoices in your books that aren't in 2B, and chase those suppliers while the relationship is warm. A credit that's merely delayed is recoverable; one chased a year later, after a notice, is a working-capital headache.
The habit that prevents it
Reconcile all three every month, before filing 3B — not at year-end and never at notice-time. A short, disciplined routine keeps your credits flowing and your filings notice-proof. That monthly reconciliation is a standard part of the GST work we run for clients.
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