GST reconciliation before year-end: a checklist for SMEs

For most small businesses, GST goes wrong in the same quiet way: the returns get filed on time, but nobody checks that the input credit claimed actually matches what suppliers reported. By year-end, the gap is real money. Here is how to close it before it closes on you.

1. Reconcile GSTR-2B against your own books, every month

Your GSTR-2B is the credit the system says you are entitled to, drawn from what your vendors filed. Your purchase register is what you actually recorded. When those two drift apart, you are either claiming credit you cannot support or missing credit you paid for.

• Match invoice-by-invoice, not just totals: totals can agree while individual entries are wrong.
• Flag anything in your books that is not in 2B, and anything in 2B you cannot place.
• Do it monthly. A year of mismatches is a project; a month of them is an afternoon.

2. Chase your vendors while it still matters

Most mismatches are simply a supplier who has not filed, or filed under the wrong GSTIN. The fix is a phone call, but only if you make it early. Once the annual window closes, that credit is gone, and no amount of correct paperwork on your side brings it back.

Keep a running list of non-compliant vendors

If the same supplier costs you credit every quarter, that is a commercial decision, not just an accounting one. Price it into the relationship.

3. Fix mismatches, don't carry them forward

The tempting shortcut is to "adjust it next month". Carried-forward mismatches compound and become impossible to unwind at audit. Resolve each one in the period it arises: amend the entry, claim or reverse the credit, and note why. A clean trail is what turns a GST notice from a crisis into a five-minute reply.

4. Your year-end checklist

• All 12 months of GSTR-2B reconciled against the purchase register.
• Every mismatch either resolved or documented with a reason.
• Ineligible credits (personal use, blocked items) reversed.
• Vendor follow-ups closed before the annual claim deadline.
• GSTR-9 and 9C figures tie back to your audited accounts.

The short version

Reconcile monthly, chase vendors early, never carry a mismatch, and walk into year-end with nothing left to find. Do that and your annual return becomes confirmation, not investigation.