GSTIN
Definition
GST Identification Number — a 15-digit unique number assigned to every registered GST taxpayer. Format: 2-digit state code + 10-digit PAN + 1 entity code + 1 default 'Z' + 1 checksum. Required on all invoices and for claiming input tax credit.
Why is GSTIN Important?
Navigating the Indian tax system requires a clear understanding of terms like GSTIN. With the introduction of the new income tax regime alongside the old one, taxpayers must evaluate their deductions, exemptions, and tax brackets carefully. This concept is a key component in optimizing your tax liabilities under the Income Tax Act and GST framework.
Proper tax planning using this metric can help individuals and businesses maximize their take-home income while remaining fully compliant with government regulations. We provide free tax calculators to help you estimate these figures accurately and make informed decisions before filing your returns.
What is GSTIN?
GSTIN (Goods and Services Tax Identification Number) is a unique 15-digit number assigned to every registered GST taxpayer. It is state-specific — a business operating in multiple states must obtain a separate GSTIN for each state.
GSTIN Format
22AAAAA0000A1Z5
| Position | Digits | Meaning |
|---|---|---|
| 1-2 | 22 | State code (e.g., 27 = Maharashtra, 06 = Haryana) |
| 3-12 | AAAAA0000A | PAN of the taxpayer |
| 13 | 1 | Entity number (for same PAN in same state) |
| 14 | Z | Default character |
| 15 | 5 | Check digit |
When GSTIN Is Required
- Mandatory on all GST invoices and bills
- Required for filing GST returns
- Needed for claiming Input Tax Credit
- Must be displayed at the business premises