How does gst number look like

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Last updated: April 8, 2026

Quick Answer: A GST number, officially called a Goods and Services Tax Identification Number (GSTIN), is a 15-digit alphanumeric code assigned to businesses registered under India's GST system. It follows the format: first two digits for the state code, next ten digits for the PAN of the business, the 13th digit for the number of registrations in the state, the 14th digit as 'Z' by default, and the last digit as a checksum. For example, a GSTIN might look like 27ABCDE1234F1Z5, where '27' represents Maharashtra. This standardized format was implemented nationwide on July 1, 2017, when GST replaced multiple indirect taxes.

Key Facts

GSTIN is a 15-digit alphanumeric code
First two digits represent the state code (e.g., 27 for Maharashtra)
Next ten digits are the business's PAN (Permanent Account Number)
13th digit indicates the number of registrations in the state
14th digit is typically 'Z' by default
Last digit is a checksum for validation
Implemented nationwide on July 1, 2017
Replaced multiple indirect taxes like VAT and service tax
Mandatory for businesses with annual turnover above ₹20 lakhs (₹10 lakhs for special category states)
Used for all GST-related transactions and compliance

Overview

The Goods and Services Tax Identification Number (GSTIN) is a unique identifier assigned to businesses registered under India's Goods and Services Tax (GST) regime, which was implemented on July 1, 2017. GST replaced a complex web of indirect taxes, including Value Added Tax (VAT), service tax, excise duty, and others, unifying them into a single tax system. The GSTIN serves as the primary reference for all GST-related transactions, compliance, and documentation. It is mandatory for businesses with an annual turnover above ₹20 lakhs (₹10 lakhs for special category states like those in the Northeast). The introduction of GST aimed to create a 'one nation, one tax' system, simplifying tax administration and reducing cascading effects. As of 2023, over 14 million businesses are registered under GST, making the GSTIN a critical component of India's economic infrastructure. The system is managed by the Goods and Services Tax Network (GSTN), a non-profit organization that handles the IT backbone.

How It Works

The GSTIN is generated based on a specific format and validation rules. It starts with a two-digit state code assigned by the Indian government (e.g., 27 for Maharashtra, 09 for Uttar Pradesh). The next ten digits are the business's Permanent Account Number (PAN), issued by the Income Tax Department, ensuring linkage between direct and indirect tax records. The 13th digit indicates the number of registrations the business has within that state, starting from '1' for the first registration. The 14th digit is typically 'Z' by default, but it can be an alphabet for future use. The 15th digit is a checksum, calculated using a modulus 10 algorithm to detect errors in data entry. For example, if a business in Gujarat (state code 24) with PAN ABCDE1234F registers for the first time, its GSTIN might be 24ABCDE1234F1Z5. This structure allows for easy identification of the state, business entity, and registration status. The GSTIN is used in invoices, returns, refunds, and other filings on the GST portal.

Why It Matters

The GSTIN is crucial for streamlining tax compliance and reducing fraud in India's economy. It enables seamless input tax credit claims, as businesses can verify suppliers' GSTINs to ensure legitimacy, preventing tax evasion estimated to cost billions annually. For example, in the 2022-23 fiscal year, GST collections averaged ₹1.5 lakh crore per month, supported by this verification system. The GSTIN also facilitates interstate trade by simplifying documentation under the Integrated GST (IGST) mechanism, boosting economic integration. Small businesses benefit from easier registration processes, with over 5 million new registrations since 2017. Internationally, it aligns India with global tax standards, improving ease of doing business rankings. Overall, the GSTIN enhances transparency, reduces compliance costs, and supports the government's digital initiatives, making it a cornerstone of India's tax reform efforts.