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Validate any GSTIN format instantly. Decode state code, PAN number, and entity type. Real-time checking as you type.
XX
State
XXXXXXXXXX
PAN Number
XZ
Entity
X
Check
GSTIN (Goods and Services Tax Identification Number) is a unique 15-digit alphanumeric code assigned to every registered taxpayer under GST in India. It is based on the PAN of the taxpayer and includes the state code.
Digits 1-2: State code (e.g., 27 for Maharashtra)
Digits 3-12: PAN of the entity
Digit 13: Entity code (number of registrations in a state)
Digit 14: Always "Z" (reserved for future use)
Digit 15: Check digit (alphanumeric checksum)
⚠️ Disclaimer: Calculations are for reference only. Verify with official GSTN portal or consult a CA before filing returns.
GSTIN — Goods and Services Tax Identification Number — is the unique 15-digit ID assigned to every GST-registered business in India. Think of it as your business's PAN card for tax purposes, except this one appears on every invoice you issue or receive.
Here's why getting this right matters: when you claim Input Tax Credit on a purchase, the government cross-checks whether the supplier's GSTIN is valid and active. If it's not — say the supplier's registration was cancelled last month — your ITC claim gets rejected. And you're on the hook for the full tax amount plus interest.
This is one of the most common triggers for ASMT-10 notices. A 10-second validation before processing payment can save you from months of headache later.
| Position | What It Means | Example |
|---|---|---|
| 1–2 | State Code | 27 = Maharashtra, 07 = Delhi, 29 = Karnataka |
| 3–12 | PAN of Taxpayer | AAAPL1234A |
| 13 | Entity Number (same PAN) | 1 = first, 2 = second registration |
| 14 | Always Z | Z |
| 15 | Check Digit | Calculated from other digits |