How to Check GST Number — Verify GSTIN Online Instantly
By Parul Singh, GST Practitioner · GST Basics · Updated June 2026
Table of Contents
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GSTIN Structure -- 15 Digits Decoded
In my 15+ years as a GST Practitioner in Karol Bagh, I have verified thousands of GST numbers. Before you can verify a GSTIN, you need to understand what those 15 digits mean. Let me break it down for you -- this is something every business owner in Delhi should know, whether you are in Chandni Chowk or Connaught Place.
Official Reference: Section 25 of the CGST Act 2017 prescribes the format of GSTIN. The first 2 digits represent the state code as per the Indian Census 2011. Delhi state code is 07.
| Digit Position | What It Represents | Example |
|---|---|---|
| 1-2 | State Code | 07 for Delhi |
| 3-12 | PAN of the taxpayer | ABCDE1234F |
| 13 | Entity number (same PAN) | 1 = first, 2 = second registration |
| 14 | Blank -- reserved | Z (default) |
| 15 | Check digit (checksum) | Computed using Luhn algorithm |
📍 Real Example -- Okhla Manufacturer GSTIN
Rajesh Industries in Okhla has GSTIN: 07AAFCA1234F1Z5
07 = Delhi, AAFCA1234F = PAN, 1 = First registration under this PAN, Z = Default blank, 5 = Check digit. If they open a second unit in Noida, the Noida GSTIN would start with 09 (UP code) with the same PAN but entity number 2.
07 = Delhi, AAFCA1234F = PAN, 1 = First registration under this PAN, Z = Default blank, 5 = Check digit. If they open a second unit in Noida, the Noida GSTIN would start with 09 (UP code) with the same PAN but entity number 2.
How to Verify GST Number Online
There are two official ways to verify a GST number:
Method 1: GST Portal (Free)
- Go to services.gst.gov.in/services/searchtp
- Enter the 15-digit GSTIN
- Solve the CAPTCHA
- Click Search -- you will see the business name, registration date, and status
Method 2: Use Our Free Tool
We have a free GST Number Search Tool that lets you verify any GSTIN instantly -- no CAPTCHA, no login required.
💡 Pro Tip from Parul: Always verify the GST number of your vendors before making large purchases. I have seen businesses in Kirti Nagar lose ₹5-10 lakh in ITC because their vendor GST registration was cancelled or the GSTIN was fake. A 30-second verification can save you lakhs.
Common GSTIN Issues
⚠️ Common Mistake: The most common fraud I see in Delhi is fake GST invoices using valid GSTINs of innocent businesses. In 2025, a textile trader in Gandhi Nagar discovered ₹47 lakh of fake sales shown against his GSTIN -- he only found out when he received a show cause notice. Always file your GSTR-1 on time so you can spot any discrepancies early through GSTR-2A/2B.
Why You Should Verify GST Numbers
As a GST consultant in Delhi, I recommend verifying GST numbers for these reasons:
- ITC protection -- You can only claim ITC on invoices from valid, active GSTINs
- Legal compliance -- Buying from cancelled/fake GSTINs can trigger scrutiny
- Fraud prevention -- ₹15,000 crore+ of fake ITC has been detected by GST authorities
- Vendor due diligence -- Before entering large contracts, verify the vendor GST status
📍 Real Example -- Maya Puri Distributor
A distributor in Maya Puri was purchasing steel from a supplier whose GSTIN showed as Active on the portal but whose last 6 GSTR-3B returns were not filed. When the distributor claimed ₹8.4 lakh ITC, it was blocked during GSTR-2B matching because the supplier had not uploaded the sales in GSTR-1. The distributor could not use that ITC until the supplier filed his pending returns -- which took 4 months.
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Frequently Asked Questions
How can I verify a GST number online for free?
Go to services.gst.gov.in/services/searchtp and enter the 15-digit GSTIN. Alternatively, use our free GST Number Search Tool at parultaxadvisory.com/tools/gst-number-search.
What does each digit of GSTIN mean?
Digits 1-2: State code, 3-12: PAN, 13: Entity number for same PAN, 14: Z (default), 15: Check digit.
Can a business have multiple GST numbers?
Yes. A business with operations in multiple states must register separately in each state. Also, multiple business verticals in the same state can have separate GSTINs.
What if my vendor GST number is cancelled?
You cannot claim ITC on invoices from a cancelled GSTIN. If already claimed, it may be reversed. Ask the vendor to get registration revived or find an alternative supplier.
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