Check whether a GSTIN is structurally valid: 15 characters, state code, embedded PAN, entity code and checksum digit. Format check, not a live lookup.
Frequently asked
What does a GSTIN contain?
A state code (2 digits), the business’s PAN (10 characters), an entity number, a “Z”, and a checksum — 15 characters in total. The PAN is literally embedded in the GSTIN.
Does this check if the GSTIN is real?
No — it checks the format is correct. To confirm a GSTIN is active and belongs to a specific business, search it on the official GST portal.
Retainer validates your client’s GSTIN structure when you add it, and uses the embedded state code to pick CGST/SGST vs IGST for you. Try Retainer free