B2B Tax Risk Mitigation Guide

How to Detect Fake GST Invoices Before Paying a Supplier

Essential tax compliance guide for accounts payable managers and B2B buyers. Learn how to verify invoice GSTINs, audit HSN codes, cross-check e-Way bills, and protect your Input Tax Credit (ITC).

8 min read

Updated: March 2026

The Risk of Fake GST Invoices in B2B Trade

Fictitious GST billing and non-existent supplier invoices represent significant tax and legal liabilities. Accepting non-compliant invoices can lead to disallowance of Input Tax Credit (ITC) during GST audits.

Pairing invoice checks with our GSTIN verification guide and supplier verification checklist ensures total tax compliance.

6 Major Red Flags on Fake GST Invoices

Flag and Reject Invoices If You Observe:

GSTIN printed on invoice shows "Cancelled" or "Suspended" on the official GST portal.

Invoice charges IGST for intra-state supply, or CGST/SGST for inter-state supply.

HSN/SAC 4 to 8 digit codes printed on invoice do not match the product category being supplied.

Supplier is registered under the "Composition Scheme" but charges separate GST amounts on invoices.

Invoice sequential numbering has sudden gaps or non-standard formatting.

Supplier legal name on invoice differs from the registered name linked to the GSTIN.

Independent Platform Notice

SaudaNama is an independent B2B business discovery and verification network. SaudaNama is not affiliated with, endorsed by, or an official agency of GSTN, the Ministry of Corporate Affairs (MCA), FSSAI, DGFT, or the Ministry of MSME.

Official Primary Sources

For verification procedures and the latest regulatory information, refer directly to the relevant official authority:

Official GST PortalOfficial public taxpayer GSTIN lookup.

Visit Official Portal

e-Invoice System PortalOfficial e-Invoice verification portal.

Visit Official Portal

Educational Due-Diligence Disclaimer

Information provided in this guide is for educational and due-diligence purposes only and does not constitute formal legal, tax, or financial advice. Buyers should consult qualified professionals before making significant financial decisions or executing commercial contracts.

Frequently Asked Questions

What is a fake GST invoice?

A fake GST invoice is issued without an underlying supply of goods or services, or issued by an unregistered/cancelled entity to fraudulently claim Input Tax Credit (ITC) or extract tax payments from buyers.

What happens if I accept a fake GST invoice?

Tax authorities will disallow Input Tax Credit (ITC) claims, recover taxes with interest, and impose severe penalties under Section 122 of the CGST Act.

How do I verify a GST invoice online?

Search the supplier's 15-digit GSTIN on gst.gov.in, confirm "Active" status, verify return filing cadence (GSTR-1 and GSTR-3B), and cross-check the e-Invoice QR code where applicable.