Why does my GSTR-2B not match my purchase register — what are the common root causes?
A GSTR-2B mismatch is usually one of a small set of repeat causes: the vendor hasn't filed their return yet, the vendor filed it with wrong details, you booked the purchase in a different month than the vendor reported it, you booked it but it isn't in GSTR-2B at all, a reverse-charge purchase is being compared incorrectly, a credit note is involved, or the vendor has been block-listed. Working out which one you're looking at tells you whether to chase the vendor, fix your own entry, or wait.
The seven causes
A guide dedicated to this exact question lists seven distinct causes for a GSTR-2B vs purchase register mismatch.
- Vendor hasn't filed yet — the purchase is genuine, but the supplier's GSTR-1 or IFF for the period isn't filed, so it hasn't reached your GSTR-2B.
- Vendor filed with wrong details — the invoice is in GSTR-2B, but a field (GSTIN, invoice number, amount) was entered incorrectly by the supplier.
- You booked it in a different month — a timing difference between when you recorded the purchase and when the supplier's filing places it in a GSTR-2B period.
- You booked it but it's not in 2B at all — the purchase exists in your books with no corresponding portal entry yet.
- Reverse charge confusion — reverse-charge purchases don't come through GSTR-2B from the supplier's filing the same way, so comparing them like a normal invoice looks like a mismatch.
- Credit notes — a credit note against an earlier invoice changes the comparison and needs to be reconciled as its own document, not folded into the original invoice.
- Block-listed vendors and Rule 86A — ITC from a vendor restricted under Rule 86A won't reconcile as available credit even if the invoice itself looks fine.
FAQs
Should I claim ITC for a purchase that isn't in GSTR-2B yet if the invoice is genuine?
The invoice being genuine doesn't put it in GSTR-2B — the credit only shows as available once the supplier has actually filed it, so the usual approach is to hold off claiming it and follow up with the supplier.
Is a reverse-charge purchase supposed to appear in GSTR-2B the same way as a normal one?
No — reverse-charge purchases don't flow through in the same way from the supplier's own filing, which is why comparing them like an ordinary invoice mismatch is misleading.
What do I do about a vendor blocked under Rule 86A?
ITC from a vendor restricted under Rule 86A won't reconcile as available credit regardless of how the invoice itself looks, so it needs separate handling rather than being chased as an ordinary mismatch.
Related guides
Sources checked
Last reviewed 2026-09-23
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