How to verify a GSTIN

Verifying a GSTIN means confirming that the number on an invoice belongs to a real, currently registered taxpayer — and that the taxpayer is the business you think you are dealing with.

Four checks cover most risk. First, the format: a GSTIN is 15 characters, beginning with a two-digit state code, followed by the holder's 10-character PAN, an entity number, the letter Z, and a checksum character. Second, the status: only an active registration can lawfully charge GST. Third, the legal name: it should match the name on the invoice, allowing for a registered trade name that differs from the legal name. Fourth, the state code: the first two digits should match the place of supply claimed on the invoice.

Verification does not tell you whether a specific invoice was actually filed, whether the supplier has paid the tax collected, or whether goods were delivered. It confirms registration facts only.

Run the check before releasing payment on a new supplier, and re-check periodically for suppliers you pay regularly — registrations can be cancelled or suspended at any time.