Resolving ITC Mismatches: A Step-by-Step Approach

Input Tax Credit (ITC) mismatches between a taxpayer's purchase records and the GSTR-2B auto-generated statement are among the most common compliance headaches for CA firms. These mismatches can result in blocked ITC, unnecessary tax outflow, and even departmental notices. A structured approach to identifying and resolving these discrepancies is essential for every practising firm.

The first step is categorising mismatches by type. The most common categories are: invoices present in your books but missing from GSTR-2B (supplier has not filed their return), invoices present in GSTR-2B but missing from your books (purchase not recorded or recorded under a different GSTIN), amount mismatches (differences in taxable value or tax amount between your records and the supplier's filing), and GSTIN mismatches (supplier filed under a different GSTIN than what appears in your records).

For invoices missing from GSTR-2B, the resolution path involves contacting the supplier and requesting them to file or amend their GSTR-1. It is advisable to send formal communication with specific invoice details and maintain a tracker with follow-up dates. For invoices in GSTR-2B but not in your books, verify whether the purchase was genuinely made, whether it was recorded under a different entity, or whether the supplier filed an incorrect invoice against your GSTIN.

Amount mismatches require careful investigation. Common causes include rounding differences, rate discrepancies (supplier applied a different GST rate), and partial payments or credit notes that were not synchronised. For each mismatch, document the root cause and the corrective action — whether it is an amendment by the supplier, a journal entry adjustment in your books, or a reversal of incorrectly claimed ITC.

TaxBook automates much of this investigation process. The platform categorises mismatches automatically, generates supplier-wise mismatch reports that can be shared directly with vendors, and tracks the resolution status of each discrepancy. For firms managing ITC reconciliation across dozens of clients, this systematic approach can recover significant amounts of blocked credit and dramatically reduce the time spent on manual follow-ups.