A Quick Way to Check Your Input Credit Mismatch

Where the Mismatch Usually Comes From

Input tax credit (ITC) is meant to match what your suppliers have actually reported and filed on their end — that's what GSTR-2B reflects. GSTR-3B is what you file, claiming credit. When the two don't line up, it's almost always one of a handful of causes: a supplier hasn't filed their return yet, a supplier filed late (so the credit shows up in a later period than you claimed it), an invoice was entered with the wrong GSTIN or tax amount, or credit was claimed on an invoice that's genuinely ineligible under the law.

A Simple Monthly Check

• Pull your GSTR-2B for the period and your own purchase register side by side.
• Match invoice-by-invoice, not just the total — totals can match by coincidence while individual invoices are actually off.
• Flag anything in your purchase register that isn't showing in GSTR-2B yet — that's credit you may need to hold off claiming, or follow up on with the supplier.
• Flag anything in GSTR-2B that you don't recognise or that doesn't belong to you — this can happen with a supplier data-entry error.

Why This Is Worth Doing Every Period

A small mismatch caught in the same month is a quick email to a supplier. The same mismatch left unresolved for two or three return cycles compounds — more invoices affected, credit claimed and later reversed with interest, and eventually a notice asking you to explain the gap. Reconciling monthly is genuinely less work overall than explaining a year's worth of mismatches after the department flags it.