GST: Importance and Verification

GST registration is mandatory in India for suppliers of goods above ₹40 lakh and services above ₹20 lakh annual turnover, with lower thresholds for special category states. To verify a GSTIN, visit gst.gov.in, click Search Taxpayer, enter the 15-character GSTIN, and confirm legal name, status, and registration date. Verification protects input tax credit under Section 16 and prevents penalty exposure under Sections 74 and 122 of the CGST Act for transactions with fake or non-existent suppliers.

Mayank Wadhera

Published: 4 Sept 2023

Updated: 16 May 2026

4 min read

GST has matured from a young indirect tax law in 2017 into the operating system of Indian commerce. In FY 2026-27, every supplier above the threshold, every B2B buyer claiming input tax credit, and every consumer protecting against fraud needs to understand both why GST matters and how to verify a counterparty's GSTIN in seconds.

Why GST registration matters

GST registration unlocks four critical rights: the ability to collect tax from customers, claim input tax credit on inward supplies, supply goods or services across states without restriction, and participate in tenders and e-commerce platforms that require registered suppliers. The registration thresholds under the prevailing CBIC notifications are ₹40 lakh for goods (₹20 lakh for special category states) and ₹20 lakh for services (₹10 lakh for special category states).

Why verifying a GSTIN is essential

Input tax credit is denied under Section 16 if the supplier is found non-existent or non-compliant.
Fake invoicing rackets have led to enforcement action under Sections 132 and 122 of the CGST Act.
GSTR-2B auto-population depends entirely on supplier filings — a bogus GSTIN never reflects credit.
Section 74 imposes 100% penalty for ITC availed on fraudulent invoices.

How to verify a GSTIN online

Visit the GST portal at gst.gov.in and click 'Search Taxpayer' on the homepage.
Enter the 15-character GSTIN and the captcha.
View legal name, trade name, date of registration, taxpayer type, and current status (Active, Cancelled or Suspended).
Cross-check the state code (first two digits) and the PAN (digits 3 to 12) with the counterparty.
Use the 'Search by PAN' option to see all GSTINs linked to the same PAN across states.

What a valid GSTIN looks like

A GSTIN is a 15-character alphanumeric: the first two digits represent the state code, the next ten characters are the PAN of the registered person, the thirteenth digit is the entity code for that PAN within the state, the fourteenth digit is the alphabet 'Z' by default, and the fifteenth digit is a check code. If the structure looks off, treat the invoice with suspicion.

Practical compliance habits

Verify every new vendor's GSTIN before raising the first purchase order.
Reconcile GSTR-2B with the purchase register monthly and flag missing invoices.
Check the supplier's return filing status — credit is restricted if the supplier has not filed GSTR-3B.
Maintain an e-invoice trail (mandatory above the prescribed turnover) and validate IRN on the invoice.

What to do when a vendor's GSTIN is cancelled or suspended

If you discover that a vendor's GSTIN has been cancelled, suspended, or marked inactive after you have made purchases, immediate corrective action is essential. Stop further procurement, reverse the ITC claimed on invoices issued after the cancellation date, and document the discovery for audit defense. Where the supplier disputes the cancellation, the supplier must apply for revocation through Form REG-21 within 90 days. As a buyer, request a copy of the cancellation order and the revocation application. If the supplier cannot revoke the GSTIN, alternative sourcing is the only safe path. The cost of continuing transactions with a cancelled GSTIN — ITC denial plus penalty — is invariably higher than the inconvenience of switching suppliers.

Year-end GST hygiene every business should run

At the end of each financial year, run a complete GST reconciliation. Match GSTR-1 outward supplies with the sales register; match GSTR-3B output tax with GSTR-1; reconcile GSTR-2B inward supplies with the purchase register; identify mismatches and resolve before 30 November of the following year (the cut-off for ITC under Section 16(4) and credit notes under Section 34(2)). Reconcile turnover declared in the audited financial statements with GSTR-9 annual return. Reconcile e-way bill data with outward supplies in GSTR-1. This year-end hygiene exercise typically surfaces credit not claimed, supplier defaults, and classification errors — all of which are easier to fix proactively than to defend in an audit.

For high-value or recurring vendors, embed GSTIN verification into the vendor master maintenance process. Run a quarterly auto-script that pings the GST portal for the latest status of every active vendor's GSTIN. Block onboarding of any new vendor whose GSTIN status is anything other than Active. Combined with monthly GSTR-2B reconciliation, this two-layer hygiene cuts ITC denial risk to near zero and gives you an audit-ready record of your supplier verification framework — a record that is increasingly valuable in any GST scrutiny or anti-evasion investigation.

Conclusion

GST is not just a tax — it is the credibility layer of Indian B2B commerce. In FY 2026-27, the cost of skipping GSTIN verification is no longer just a denied credit but potential penalty under Sections 74 and 122. A two-minute check on the GST portal before onboarding a vendor is the cheapest insurance you can buy.

Frequently Asked Questions

What is the GST registration threshold in FY 2026-27?

Under the prevailing CBIC notifications, GST registration is mandatory when annual turnover from supply of goods exceeds ₹40 lakh, or ₹20 lakh in special category states. For services, the threshold is ₹20 lakh, reduced to ₹10 lakh in special category states. Inter-state suppliers and e-commerce sellers must register regardless of turnover.

How can I verify if a GSTIN is genuine?

Visit gst.gov.in, click Search Taxpayer, and enter the 15-character GSTIN. The portal displays legal name, trade name, registration date, taxpayer type, and status (Active, Cancelled or Suspended). Always cross-check the PAN portion (characters 3 to 12) with the supplier's PAN card before relying on the GSTIN.

What happens if I claim ITC on an invoice from a non-existent supplier?

Input tax credit will be reversed under Section 16 of the CGST Act, with interest under Section 50. If the transaction is treated as a fraudulent claim, Section 74 imposes a penalty equal to 100% of the tax involved, and Section 122 may apply additional penalties. In serious cases, Section 132 enables prosecution.

Can one PAN have multiple GSTINs?

Yes. A single PAN can hold multiple GSTINs — one for each state where the registered person has a place of business, plus separate GSTINs for vertical business segments if opted for. Use the Search by PAN feature on the GST portal to view all GSTINs linked to a PAN.