What is GST Number? – Example and Format of 15 Digits GSTIN

By Annapoorna

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Updated on: Aug 22nd, 2025

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5 min read

The Goods and Services Tax Identification Number (GSTIN) is a unique 15-digit code assigned to every GST-registered business. It serves as a digital identity for taxpayers, facilitating seamless tax compliance, Input Tax Credit (ITC) claims, and transparent transactions. Understanding GSTIN is essential for legal compliance and smooth business operations across all business sizes.

Key Takeaways

  • GSTIN is a unique 15-digit alphanumeric code that serves as the digital identity for all GST compliance requirements in India.
  • The GSTIN format reveals vital information, including the state code, PAN, registration sequence, and a checksum for verification.
  • GSTIN can be verified using the GST portal, ensuring safe and compliant transactions.
  • There are several benefits of obtaining a GSTIN, from mandatory compliance and ITC benefits to enhanced credibility and access to financing.
  • GSTIN is a tax registration number under GST. Whereas, GSTN is an organisation that manages the entire IT system of the GST portal.
 

What is GSTIN?

GSTIN is a unique 15-digit alphanumeric code assigned to every business that registers for GST in India, serving as the digital identity for all GST compliance requirements. Commonly known as the GST number, it plays a crucial role in tasks such as invoicing, tax filing, claiming ITC, and ensuring overall regulatory compliance.

Who needs GSTIN?

Every individual who is mandatorily required to undergo GST registration must complete the process and obtain a GSTIN. However, businesses can voluntarily opt for GST registration to avail ITC benefits and enhance their market credibility. 

Once registered, businesses must comply with all requirements under the GST law, including return filing.

GST Number Format & Example

Understanding the structure of the GSTIN can provide valuable insights into a business's registration and tax details. The 15-digit code is more than just a unique identifier; it incorporates critical information about the business, including its state of operation, PAN details, and registration specifics.

GST Number Format & Example

For example, consider the GSTIN "27ABCDE1234F2Z5". Here's a breakdown of what each part represents:

  • "27" - The first two digits indicate the state code where the business is registered (in this case, 27 represents Maharashtra).
  • "ABCDE1234F" - The following ten characters correspond to the business's Permanent Account Number (PAN).
  • "2" – The 13th digit is the entity number, which shows the sequence of registration for the same PAN within that state.
  • "Z" – The 14th character is typically a default value.
  • "5" – The last digit is a checksum used to verify the accuracy of the GSTIN.

How to apply for GSTIN?

It is part of the GST Registration process. Once the application is approved by the GST officer, a unique GSTIN is allocated to the dealer. Below is an overview of the key steps involved in GST Registration. 

  1. Visit the official GST portal and navigate to Services > Registration > New Registration.
  2. Fill in your personal and business details, including PAN and contact information.
  3. Upload the necessary documents such as proof of identity, address, and bank details.
  4. Verify your mobile number and email via OTP authentication.
  5. Complete the application by digitally signing (if applicable) and submitting the form.
  6. Wait for the application to be reviewed and verified by the authorities.
  7. Once approved, your unique GSTIN is issued.

For a comprehensive understanding and additional insights, please refer to our detailed article on GST registration.

Details & Documents Required for GSTIN

When applying for a GSTIN, you'll need to submit a set of details and supporting documents to ensure your application is processed smoothly. Key requirements include:

  1. PAN Card: Used to verify the identity of the business and its owner.
  2. Proof of Business Registration: Incorporation certificate, partnership deed, or any equivalent business formation document.
  3. Identity Proof: Documents like Aadhaar card, passport, or voter ID for the proprietor or authorised signatory.
  4. Address Proof: Utility bills, rental agreements, or property tax receipts to confirm the business address.
  5. Bank Account Details: A cancelled cheque or bank statement for verifying bank account information.
  6. Mobile Number and Mail ID: A valid contact number and email address for communication and OTP-based authentication during the registration process.
  7. Photographs: Recent passport-sized photos of the proprietor or authorised signatory.
  8. Jurisdiction Details: Information specifying the state code and the relevant local jurisdiction under which the business operates.
  9. Digital Signature Certificate (if applicable): Required for companies and LLPs to enable the digital verification and submission of forms.

These combined details and documents are vital to validate your application and ensure a seamless GST registration process.

How to verify a GSTIN?

The GST portal includes convenient features that allow users to search by GSTIN or search by PAN to quickly locate taxpayer information. The GSTIN authenticity is essential to prevent fraud and ensure legitimate business transactions.

When verifying a business's GSTIN details on the GST portal, ensure you check the following details:

  • Business name matches invoice details
  • Registration status shows as "Active"
  • Address corresponds to the actual business location
  • The taxpayer type (e.g., regular or composition scheme)
  • Consistency in filing returns

Alternatively, you can also use, Clear GST Search Tool for verification of GSTIN.

These are usual cases where a business should check GSTIN:

  • During invoice processing and reconciliation
  • While claiming ITC
  • Before finalising new vendor agreements
  • For compliance audit purposes

Benefits of Getting a GSTIN

GSTIN is crucial for businesses in multiple aspects, such as:

  • Mandatory requirement: Compliance with GST laws and regulations is necessary. If not registered, when liable, can attract penalties of Rs 10,000 or the tax amount due, whichever is higher
  • ITC benefit: Enables businesses to claim credit for GST paid on purchases, reducing overall tax liability and improving cash flow.
  • Interstate trade: Facilitates seamless movement of goods and services across state boundaries without multiple state registrations.
  • Enhanced credibility: Establishes legitimacy and builds trust among customers, suppliers, and stakeholders.
  • Market access: Required for government contracts, tenders, and registration on e-commerce platforms.
  • Transparent transactions: Enables proper invoicing and reduces tax evasion risks through systematic tracking.
  • Improved access to financing: A registered business often has easier access to loans and credit facilities, as GST compliance enhances financial credibility.

How is GSTIN different from GSTN?

Do not get confused between GSTIN and GSTN. GSTIN is a tax registration number under GST. Whereas, the Goods and Services Tax Network (GSTN) is an organisation that manages the entire IT system of the GST portal. This portal will be used by the Government of India to track every financial transaction and will provide taxpayers with all services, from registration to filing taxes and maintaining all tax details.

Once you have a GSTIN, you will need to:

Frequently Asked Questions

What is a GSTIN?

GSTIN (Goods and Services Tax Identification Number) is a unique 15-digit alphanumeric code assigned to every business registered under GST system. It serves as a tax identification number for compliance, invoicing, and ITC claims.

What does GSTN mean?

GSTN stands for Goods and Services Tax Network, which is the IT infrastructure and organisation that manages the entire GST portal system. It's different from GSTIN, while GSTIN is your business identification number, GSTN is the technology platform that facilitates GST operations.

Is GST a 15-digit number in India?

Yes, GSTIN is a 15-digit alphanumeric code in India. The format includes: state code (2 digits) + PAN (10 digits) + entity code (1 digit) + default alphabet (1 digit) + checksum digit (1 digit).

How to find your GSTIN number?

You can find your GSTIN through several methods. It is available on the GST registration certificate, previous GST returns and GST-compliant invoices. Additionally, you can search it using the search by PAN feature, offered by the GST portal.

Can an individual have more than one GSTIN?

Yes, a business or individual can have multiple GSTINs under the same PAN.

Is GSTIN mandatory for all businesses?

GSTIN is mandatory for businesses exceeding turnover thresholds (Rs 40 lakhs for goods, Rs 20 lakhs for services in regular states), inter-state suppliers, e-commerce operators, and specific categories such as casual taxable persons. However, smaller businesses can opt for voluntary registration to avail benefits.

What is the cost of obtaining GSTIN?

Registering for GST and obtaining GSTIN are free of cost.

How to get GSTIN online?

You can apply for GST registration and obtain your GSTIN by submitting the required details and documents on the official GST portal. The process is entirely digital, ensuring a smooth and paperless experience.

How to activate GSTIN number?

Once your GST registration is approved, your GSTIN is automatically activated and becomes operational. You simply need to start using it for filing returns and compliance without additional manual activation.

How can I amend or update details in my GSTIN?

Log in to the GST portal using your credentials.Then, navigate to Services > Registration > Amend Registration (Core or Non-Core fields) based on the changes you wish to make. Update the necessary information and submit the form. Once approved by the authorities, the changes will be updated against your GSTIN.

When can a GSTIN be cancelled or suspended?

A GSTIN may be cancelled or suspended if the registered business fails to comply with GST regulations or does not file returns for a prescribed period. It can also be subject to suspension in case of fraudulent activities or discrepancies in submitted information.

What happens if I use an incorrect or inactive GSTIN?

Using an incorrect or inactive GSTIN during transactions may result in compliance issues and can lead to rejection of invoices or claims. It is essential to verify the GSTIN details on the GST portal to avoid discrepancies and related penalties.

What should I do if my GSTIN is blocked?

If your GSTIN is blocked, you should immediately contact the GST helpdesk or your tax consultant to understand the reason and initiate the resolution process. Prompt action can help resolve any discrepancies and reinstate your GSTIN status.

How does GSTIN relate to Input Tax Credit (ITC)?

Your GSTIN serves as a critical identifier that links your business transactions with the proper claiming of Input Tax Credit (ITC). Accurate and active GSTIN details are essential for ensuring that ITC claims are valid and properly recorded in your GST returns.

About the Author
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Annapoorna

Assistant Manager - Content
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I preach the words, “Learning never exhausts the mind.” An aspiring CA and a passionate content writer having 4+ years of hands-on experience in deciphering jargon in Indian GST, Income Tax, off late also into the much larger Indian finance ecosystem, I love curating content in various forms to the interest of tax professionals, and enterprises, both big and small. While not writing, you can catch me singing Shāstriya Sangeetha and tuning my violin ;). Read more

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