GSTR-9 and GSTR-9C Reconciliation Mismatches

GSTR-9 is required where aggregate turnover exceeds ₹2 crore, and GSTR-9C where it exceeds ₹5 crore, both due by 31 December following the financial year. Scrutiny is driven by a small number of recurring mismatches: turnover differences between books and returns, ITC discrepancies against auto-populated data, tax paid under the wrong head, and unreconciled credit notes.

The reconciliations that matter

Turnover: books versus GSTR-1 versus GSTR-3B. Differences typically arise from supplies recorded in books on a different basis from time-of-supply rules, non-GST income included in book turnover, unbilled revenue, and schedule adjustments. Each is explicable, but each must be documented at filing rather than reconstructed under notice.

ITC: books versus GSTR-3B versus auto-populated data. Where credit is claimed in books but does not appear in auto-populated data, the cause is almost always supplier non-filing or supplier reporting error. Where it appears in auto-populated data but was not claimed, the credit may be lost if 30 November has passed.

Tax paid under the wrong head. IGST paid where CGST and SGST were due, or vice versa, is common on inter-state and place-of-supply errors.

Credit and debit notes. Notes issued after year end but relating to the year, and notes issued beyond the permitted time limit, both create mismatches.

Reverse charge. Liability discharged and credit claimed on it must both reconcile, and the two are frequently recorded in different periods.

Common causes worth pre-empting

Place-of-supply errors on services, which drive head-wise mismatches. Exempt and non-GST supplies included or excluded inconsistently, which also affects apportionment of common credit. Stock transfers and cross-charges between distinct registrations of the same entity, frequently under-reported. And employee recoveries, where the taxability position has shifted over time.

Practical approach

Reconcile quarterly rather than at year end, so supplier defaults can still be pursued and the 30 November credit deadline can still be met.

Maintain a standing reconciliation working paper carrying explanations forward, so the explanation for a recurring difference is written once.

Where a difference cannot be resolved, disclose and explain it in the reconciliation statement rather than leaving it to be discovered.

Related reading

• claiming input tax credit — GST Input Tax Credit: Conditions, Blocked Credits and Disputes
• how to answer a GST notice — How to Respond to a GST Notice: A Practical Checklist
• the annual filing calendar — Compliance Calendar FY 2026-27: Income Tax, GST, FEMA and ROC

Sources

• GSTR-9 and GSTR-9C requirements, CGST Rules — cbic.gov.in