Basics

What is a GSTIN and how to read it

Every GST registration has a 15-digit GSTIN. Here's what each part means and how to read yours.

By the Launch My Office team · Updated 2026-06-19 · 4 min read

A GSTIN is your 15-digit GST identity in a state. Reading it tells you a lot.

How the 15 digits break down

Because digits 1–2 are state-specific, the same business gets a different GSTIN in each state — see multi-state GST.

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What is a GSTIN?

A GSTIN is the 15-digit Goods and Services Tax Identification Number assigned to a business registered under GST in a state.

What do the first two digits mean?

They are the GST state code — see the full GST state code list.