GST Number Validator

Validate any 15-digit GSTIN using the official checksum algorithm. Decode state, PAN details, entity type, and registration number embedded in the GSTIN.

Enter GSTIN (15-digit GST Number)

GSTIN format: SS·PPPPPPPPPP·E·Z·C — 2-digit state, 10-char PAN, entity number, 'Z', check digit

About GSTIN

GSTIN Structure

A GSTIN (Goods and Services Tax Identification Number) is 15 characters:
· Chars 1–2: State/UT code (01–38 + 97/99)
· Chars 3–12: PAN of the taxpayer
· Char 13: Entity number (how many registrations this PAN has in the state)
· Char 14: Always 'Z'
· Char 15: Checksum digit

Checksum Algorithm

The last character is a mod-36 check digit. Characters are from the set 0–9A–Z. Each position is multiplied by alternating factors (1, 2, 1, 2 …), the product's digits summed, then the final remainder checked against the same character set.

Entity Types (from PAN)

The 4th character of the embedded PAN reveals the entity type: P=Individual, C=Company, H=HUF, F=Firm/LLP, A=AOP/BOI, T=Trust, B=BOI, G=Government, J=Artificial Juridical Person, L=Local Authority.

Disclaimer

This tool only validates the format and checksum of a GSTIN. A valid checksum does not confirm that the GSTIN is actually registered or active. Always verify on the official GST Portal for authoritative verification.