GSTIN (GST Identification Number)

The unique 15-character identifier assigned to every business registered under GST in India.

A GSTIN is the 15-character alphanumeric number issued to each GST-registered business. It appears on invoices and is used for filing returns and claiming input tax credit.

The number encodes useful information: the first two digits are the state code, the next ten are the holder's PAN, the 13th is the entity/registration number within the state, the 14th is 'Z' by default, and the 15th is a checksum.

Format example: 27ABCDE1234F1Z5.
Digits 1–2 = state code; 3–12 = PAN; 13 = entity number; 15 = checksum.
Required on tax invoices for B2B supplies.

Frequently asked questions

How can I verify a GSTIN?

Check the format and checksum with a GSTIN validator, and confirm the registration status on the official GST portal before doing business with a new party.

Is GSTIN the same as PAN?

No. GSTIN contains the PAN (characters 3–12) but adds the state code, entity number and checksum to uniquely identify a GST registration.

GSTIN (GST Identification Number)

Frequently asked questions

How can I verify a GSTIN?

Is GSTIN the same as PAN?

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