Verify Supplier Paid Sales Tax

Here is a costly scenario many businesses never see coming: you buy from a supplier, they charge you sales tax, you pay it in full — and then they never deposit that tax with FBR. When FBR's system catches the gap, it is you, the buyer, who loses the input tax claim, not the supplier who pocketed it. Under the Sales Tax Act, 1990, the law deliberately puts the burden of a clean supply chain on the person claiming the credit.

So how do you check whether a supplier has actually paid the tax they charged you? You cannot see their treasury deposit directly — but FBR's system gives you a reliable proxy, and a few habits protect you completely. This guide explains how, based on the Sales Tax Act, 1990 as amended up to 30 June 2025.

Why This Is Your Problem, Not Just the Supplier's

The Sales Tax Act makes the buyer responsible for the supplier's compliance, through several linked provisions:

• Section 8 — your input tax is inadmissible if the supplier has not declared or paid the tax, or if the system shows a discrepancy on the transaction.
• Section 8A — joint and several liability: if you had reason to believe the tax would not be paid, FBR can recover it from you.
• Section 21(3) — no input tax credit on invoices from a blacklisted or suspended supplier.
• Section 73 — input tax is disallowed unless payment is made through a banking channel.

The Mechanism: How FBR Cross-Matches

FBR's return system links every supplier and buyer automatically. The supplier declares each sale in their sales annexure; FBR's computerised cross-matching program (CREST) compares that against the buyer's purchase data. When you file your monthly return, your purchase annexure is auto-populated from what your suppliers declared.

This gives you a practical test:

Only invoices from registered suppliers appear for input tax credit — purchases from unregistered suppliers are not eligible at all.

Step 1 — Verify Before You Deal

• Check the supplier's STRN is registered and active on FBR's Sales Tax Active Taxpayers List (updated every Sunday). Verify the number on FBR's online verification portal or the Tax Asaan app.
• Confirm they are not blacklisted or suspended — invoices from such suppliers are dead weight under Section 21(3).

Step 2 — Pay the Right Way

• Get a proper tax invoice showing the supplier's STRN, invoice number, and the tax charged.
• Pay through the bank into the supplier's business account (Section 73) and keep the proof — your single strongest protection. (See our guide on Section 73 — paying suppliers through the bank.)

Step 3 — Verify at Filing Time

This is the actual check. In IRIS, open your purchase annexure and confirm each invoice appears and is matched from the supplier's declared sales. If an invoice is missing or flagged, the supplier has not declared it — do not claim that input tax until it is resolved, and chase the supplier to file correctly.

Practical Examples

Example 1 — The missing invoice

Mr. Imran buys goods worth Rs 500,000 plus tax and pays by bank. At filing, the invoice does not appear in his IRIS purchase data — the supplier never declared the sale. Mr. Imran holds the claim, contacts the supplier, and only claims once the supplier files and the invoice matches. He has avoided a disallowance.

Example 2 — The blacklisted supplier

Sara discovers, when verifying the STRN, that her supplier has been suspended. Under Section 21(3), any input tax on that supplier's invoices is inadmissible — so she stops dealing with them rather than lose the credit.

Example 3 — Cash payment, no protection

Mr. Bilal pays a Rs 300,000 invoice in cash. Even if the supplier declared the sale, the payment fails Section 73, so the input tax is disallowed. Paying through the bank would have protected him.

How to Protect Yourself — Checklist

1. Verify the STRN is active before dealing (ATL + online verification).
2. Avoid blacklisted/suspended suppliers.
3. Always pay through the bank into the supplier's business account.
4. Keep valid tax invoices with the supplier's STRN.
5. Check the IRIS match before claiming input tax each month.

Frequently Asked Questions

Can I see if my supplier paid the sales tax to FBR?

Not the treasury deposit directly — but when you file, your purchase data is auto-populated from your suppliers' declared sales. If your invoice appears and matches, the supplier has declared that sale; if it is missing, they have not, which is your warning sign.

What happens if my supplier did not pay the sales tax?

Under Section 8, your input tax becomes inadmissible if the supplier has not declared or paid the tax. Under Section 8A you can even be held jointly liable. You lose the claim even though you paid the vendor.

How do I verify a supplier is registered?

Check the STRN against FBR's Sales Tax Active Taxpayers List (updated every Sunday) and verify it on FBR's online portal or the Tax Asaan app. Confirm the supplier is not blacklisted or suspended.

How does paying through the bank protect my input tax?

Under Section 73, business payments above Rs 50,000 to a single supplier in a tax period must go through the bank into the supplier's business account. The bank trail proves the transaction and keeps your input tax claim valid.

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