Does a valid checksum mean the GSTIN is active?

No. The checksum only proves the number is well-formed. Use 'Search Taxpayer' on the GST portal to see whether it is active, cancelled or suspended, and the legal name.

Why do some businesses have several GSTINs with the same PAN?

A GSTIN is state-specific, and a business can also take separate registrations for business verticals in the same state; the 13th character distinguishes them.

Can I claim ITC if the supplier's GSTIN was cancelled later?

Credit is generally allowed for invoices issued while the registration was valid and reported in GSTR-1, but cancellations with retrospective effect can lead to credit being questioned.

Can I rely on this calculator's result for filing?

Use it as a planning estimate. The final figure depends on the tax year's rules and your exact documents, so a CA should review it before you file or pay.

Does the calculator store my data?

No. The calculation runs in your browser and nothing you type is saved. If you want a CA to review it, share your documents through our checklist-led process.

GST calculator

GSTIN Validator

A GSTIN is a 15-character number: a 2-digit state code, the holder's 10-character PAN, an entity number for multiple registrations in the same state, the letter 'Z' by default, and a check character computed from the other 14. This tool validates all of these offline. A well-formed GSTIN can still be cancelled or suspended, so confirm the taxpayer's status on the GST portal before claiming input tax credit.

GSTIN length: 15 characters
First 2 digits: State code
Characters 3–12: Holder's PAN

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GSTIN Validator

Checks format, state code, embedded PAN and the check digit — offline.

Checksum

GSTIN (15 characters)

Status

Valid format & checksum

State

Maharashtra

Embedded PAN

AAPFU0939F

PAN holder type

Firm / LLP

A valid format doesn't prove the registration is active. Confirm the taxpayer's status with "Search Taxpayer" on the GST portal before claiming input tax credit.

How a GSTIN is structured

Position	Meaning	Example (27AAPFU0939F1ZV)
1–2	State code	27 — Maharashtra
3–12	PAN of the registered person	AAPFU0939F
13	Entity number for the same PAN in the state	1
14	Default letter	Z
15	Check character	V

Why validate a supplier's GSTIN

Input tax credit is allowed only on invoices with a valid, active supplier GSTIN
Fake or mistyped GSTINs on invoices lead to credit reversal with interest
A cancelled supplier's invoices won't appear in GSTR-2B
E-invoices and e-way bills reject invalid GSTINs

Common state codes

Code	State / UT
07	Delhi
09	Uttar Pradesh
24	Gujarat
27	Maharashtra
29	Karnataka
33	Tamil Nadu
36	Telangana
37	Andhra Pradesh

Official sources

GST portal — Search Taxpayer

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Frequently Asked Questions

Quick answers to the questions we hear most often.