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GSTIN Validator

Updated October 2026 Check whether a GSTIN is correctly formatted and passes the official checksum algorithm — a quick first check before invoicing or filing.
⚠ Verify before filing. Results are estimates based on the law as applied at the date shown above. Tax rules change — always confirm the current rate or provision at the official source (CBIC or Income Tax Department) before raising an invoice or filing a return. Last reviewed: 12 October 2026.
GSTIN Validator

Frequently Asked Questions

What does a GSTIN validator actually check?

It checks that the 15-character structure is correct (2-digit state code + 10-character PAN + entity code + 'Z' + checksum) and that the final checksum character matches — it does not confirm the GSTIN is active or registered.

How do I check if a GSTIN is actually registered and active?

Use the official GST portal's "Search Taxpayer" tool, which confirms live registration status, legal name, and filing status — this calculator only checks the number's format.

What are the first two digits of a GSTIN?

The first two digits are the state code where the business is registered — for example, 27 is Maharashtra and 07 is Delhi.

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