Plain-English guides for accounts, purchase and credit teams on checking suppliers and protecting your input tax credit. Each guide is checked against the CGST Act, CBIC notifications and the GST portal’s own help pages, and lists its sources.
How to verify a GST number (and spot a fake one)
Four quick checks to confirm a supplier’s GSTIN is genuine, active and matches the invoice, using the GST portal and a free checker.
GSTIN format explained: what each of the 15 characters means
What the state code, PAN, registration number, Z and check character in a GSTIN mean, and how to spot a mistyped or fake GST number.
How to check a supplier’s GST return filing status
Step-by-step: use the GST portal’s Show Filing Table to see whether a supplier files GSTR-1 and GSTR-3B, and how to read gaps and late filing.
Supplier didn’t file GSTR-1? What happens to your input tax credit
Why your ITC depends on the supplier’s GSTR-1 and GSTR-2B, the deadlines that apply, and what to do step by step when invoices are missing.
Tools: free GSTIN checker with live status · bulk GSTIN validator · supplier watchlist (free trial)
General information, not tax advice. GSTRisk is independent and not affiliated with GSTN or the Government of India.