GST Number Check: How to Verify if a GSTIN Is Valid or Fake

A GST number check is free and takes about two minutes. Enter the 15-character GSTIN on the official GST portal under Search Taxpayer, and the portal shows the business’s legal name, trade name, registration date and status. A correct-looking format alone does not prove a number is genuine, so the portal lookup is the step that really counts. This guide explains the GSTIN format, the step-by-step online check, what each status means, and the warning signs of an invalid GST number.

What Is a GST Number (GSTIN)?

A GSTIN (Goods and Services Tax Identification Number) is a unique 15-character number given to every registered taxpayer under GST. It appears on tax invoices, e-invoices, e-way bills, and returns, and it links a business to its PAN and its state of registration.

GSTIN Format Explained

Every standard GSTIN follows the same structure:

Illustrative Pattern

08 ABCDE1234F 1 Z 5 shows the layout only. It is a made-up pattern, not a real registration.

Common State Codes

Delhi 07, Rajasthan 08, Uttar Pradesh 09, Gujarat 24, Maharashtra 27, Karnataka 29, Tamil Nadu 33.

Why You Should Verify a GST Number Before Doing Business

Protect Your Input Tax Credit (ITC)

If you buy from a supplier whose registration is invalid or cancelled, your ITC claim can come under question. A quick GSTIN verification before you pay saves trouble later.

Spot Registration Issues Early

One PAN can hold multiple GSTINs, one for each state. Checking the state code and trade name helps you confirm you are dealing with the right registration. Read our guide on multistate GST registration to understand how this works.

Support Your Own Compliance

Correct GSTINs on invoices keep your returns clean. If you face return problems, see this explainer on a GSTR-3B filing error with no tax liability.

How to Check a GST Number Online (Step-by-Step)

Level 1: Quick Format Check

Before opening the portal, make sure the number has 15 characters, starts with a valid state code, contains a PAN-style block in positions 3–12, and has “Z” as the 14th character in the standard format. Watch for the letter O versus the digit 0.

Level 2: Verify on the Official GST Portal

Steps

1. Open www.gst.gov.in.
2. Click Services → Search Taxpayer → Search by GSTIN/UIN.
3. Type the 15-character GSTIN.
4. Enter the captcha and click Search.
5. Read the result and compare it with the invoice or the business details.

Tips for an Accurate Result

• Copy the number from the invoice instead of retyping it.
• Remove spaces and use capital letters.
• If the portal changes its layout, follow the on-screen menu. See the GST portal filing update and preparation guide for recent portal changes.

What Details Will You See After a GST Number Check?

GST Number Status: Active, Suspended or Cancelled

Active

The registration is currently valid. This is the status you want to see for a supplier.

Suspended

The registration is temporarily on hold, usually while the department examines a cancellation. Be careful with new transactions until it is resolved.

Cancelled

A cancelled GSTIN does not automatically mean the number is fake. It may have been valid earlier and cancelled later, by the taxpayer or by the department. It does affect how you should treat new invoices and ITC. Registration cancellation usually follows a notice, so our GST Notices A-Z Guide explains the forms and deadlines involved.

How to Know if a GST Number Is Invalid or Fake

These are warning signs, not final proof. Always confirm on the portal.

• The number does not have 15 characters.
• The state code does not match the business’s state.
• The PAN block looks wrong or does not match the business’s PAN.
• The portal shows “not found” or no matching record.
• The legal or trade name differs from the invoice.
• The invoice shows GST charged by a supplier whose status is not active.

Common Mistakes While Checking a GSTIN

• Mixing up O and 0, or I and 1.
• Typing extra spaces or missing a character.
• Treating a format match as full verification.
• Ignoring a status mismatch between old and new records.
• Checking only once and never re-checking regular suppliers.

Where a Correct GSTIN Matters Most

E-Invoicing and RCM Self-Invoices

For businesses covered by e-invoicing, accurate GSTIN details are essential. GSTN is also extending e-invoicing to RCM self-invoices. Read E-invoicing for RCM self-invoices: what is changing and RCM self-invoices are coming under e-invoicing.

E-Way Bills

E-way bills also carry the GSTIN of the supplier and recipient. For the latest on this, see GSTN puts e-way bill changes on hold.

Disputes and Appeals

If a demand order goes against you, you may be able to appeal. Read about the GST appeal against a NIL demand order (APL-01).

Frequently Asked Questions

Can I check a GST number without logging in?

Yes. The Search Taxpayer option on the GST portal works without logging in.

Is a GST number check free?

Yes. The official portal does not charge for a GSTIN search.

How many digits are in a GSTIN?

A GSTIN has 15 characters, a mix of digits and letters.

How do I know if a GSTIN is active?

Search it on the portal and read the status field. It shows Active, Suspended, or Cancelled.

Can I find a company’s name from its GST number?

Yes. The search result shows the legal name and trade name linked to the GSTIN.

What if a GST number shows as cancelled?

Do not assume it is fake. Ask the supplier for details, check the cancellation date, and consult a professional before claiming ITC on invoices raised around that period.

Conclusion

A GST number check protects your ITC, your payments, and your compliance. Check the format first, then verify on the official GST portal, and read the status carefully before you rely on any invoice.