What usually causes a GSTIN mismatch?

Most cases come from bad master data, transcription errors, or vendor identity drift across exports.

Can an invoice still be valid with a GSTIN mismatch?

Yes, but it should be reviewed carefully because the mismatch can block a clean match and affect filing decisions.

[003] GLOSSARY

A mismatch where the GST registration number differs between books and portal-side data.

29 May 2026

A GSTIN mismatch occurs when the tax registration number in books does not match the portal-side value for the same supplier or invoice.

A GSTIN mismatch can prevent an otherwise valid invoice from matching cleanly and may point to a master data issue that should be fixed upstream.

The books record one GSTIN digit differently from the portal export.

Fixing the invoice row without checking whether the vendor master data is also wrong.