GST Tip of the Day: Verify Your Supplier's GSTIN Before You Pay That Invoice

Today's tip in one line

Before you pay a new supplier — or a regular one you have not checked in a while — spend two minutes verifying their GSTIN on the GST portal. Your input tax credit (ITC) depends on it.

Many small businesses treat a printed GSTIN on an invoice as proof that everything is in order. It is not. A GSTIN can be cancelled, suspended, or simply fake — and if it is, the ITC you claim against that invoice is at risk of being reversed, with interest.

Why this matters for your ITC

Under Section 16(2) of the CGST Act, you can claim ITC only if a set of conditions are met. Two of them are easy to overlook:

• The tax charged on your purchase must actually be paid to the government by your supplier — Section 16(2)(c).
• The invoice details must appear in your GSTR-2B (auto-drafted from the supplier's GSTR-1).

If your supplier has not filed returns, or their registration is cancelled, the invoice may never reach your GSTR-2B — and the department can disallow the credit you claimed. You end up paying the tax again, plus interest, even though you genuinely paid your supplier.

How to verify a GSTIN in two minutes

1. Go to the GST portal and open Search Taxpayer → Search by GSTIN/UIN.
2. Enter the 15-digit GSTIN from the invoice.
3. Check the legal name and trade name — they should match the party you are dealing with.
4. Check the status — it should read Active. Avoid anyone marked Suspended or Cancelled.
5. Note the registration date and constitution of business — these should make sense for the vendor.

The portal also lets you view a taxpayer's return filing history (Search Taxpayer → return filing status). A supplier who has not filed GSTR-1 or GSTR-3B for several months is a red flag — their invoices may not flow into your GSTR-2B.

A quick sanity check on the number itself

The 15-character GSTIN follows a fixed structure:

• First 2 digits — the state code.
• Next 10 characters — the supplier's PAN.
• 13th character — entity/registration number for that PAN in the state.
• 14th character — the letter Z (by default).
• 15th character — a checksum digit.

If the state code does not match where the supplier operates, or the embedded PAN does not match the PAN on their documents, ask questions before you transact.

Build it into your routine

Verifying GSTINs is not a one-time exercise. Make it a habit:

• Onboard new vendors with a check. Save a screenshot of the Active status in your vendor file.
• Re-verify large or recurring suppliers periodically. A GSTIN that was active last year may be cancelled today.
• Reconcile against GSTR-2B every month. If a supplier's invoice is missing, follow up before you file GSTR-3B — do not just claim it and hope.
• For e-invoices, scan the QR code; a valid IRN confirms the invoice was reported to the Invoice Registration Portal.

The takeaway

The tax law puts the onus on the recipient to claim only eligible ITC. You cannot control whether your supplier files and pays on time, but you can choose who you do business with and you can catch problems early. A two-minute GSTIN check today is far cheaper than a credit reversal and interest demand a year later.

Verify before you pay. Reconcile before you file. That is the discipline that keeps your ITC safe.