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To verify a GST invoice, check the supplier’s GSTIN against the GST portal or an authorized IRP, compare the invoice’s required particulars and tax figures with the transaction, and—when the document is an e-invoice—verify its signed QR code or IRN. These checks establish whether the document’s details are consistent with the registration and records you can verify; they do not, by themselves, prove that the goods or services were supplied or that the invoice has not been cancelled or duplicated.
What does it mean to verify a GST invoice?
Invoice verification is a set of checks, not a single pass-or-fail lookup. You are comparing three things: the supplier’s GST registration, the details printed on the invoice and the underlying purchase. If the document is an e-invoice, you also check its signed QR data or IRN through an official verification route.
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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesA GSTIN lookup can confirm registration details and status returned by the search service. It cannot confirm the commercial facts of a purchase. For that, reconcile the document with your purchase order, delivery or service evidence, quantities, agreed pricing and payment records.
A matching active GSTIN, complete invoice particulars and a verifiable signed QR/IRN create strong documentary consistency. Treat that as evidence to support your records—not as a substitute for checking the supply itself, the tax treatment or the document’s cancellation status.
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How do I check whether a supplier’s GSTIN is genuine?
Search the GSTIN using the GST portal or an authorized IRP’s GSTIN status or search function. Compare the returned taxpayer details with the supplier information and the invoice; do not rely only on a GSTIN printed on the document.
- Enter the supplier GSTIN in the portal or authorized IRP search function. Use the official service rather than a number or status copied into an email or invoice.
- Review the returned legal name, trade name, address, PIN code, registration type and status. Those are among the taxpayer attributes the official search documentation says it returns.
- Compare the result with the supplier’s invoice and the business details you have on file. Check the legal name as well as the trade name, and compare the address and PIN code rather than assuming a familiar brand name is sufficient.
- Check whether the registration status is consistent with the invoice date. Where a return system requires date-specific validation, an active status today is not necessarily the same as proof that the registration was valid on an earlier invoice date.
- Save the lookup result or record the check date and the GSTIN searched as part of your accounts-payable review. This makes it clear which registration details you relied on if a discrepancy is raised later.
If the GSTIN is not found, its status is not what you expected, or the returned identity materially differs from the invoice, pause the invoice review and ask the supplier to clarify or correct the document. A mismatch is a reason to investigate; the search alone does not explain whether the cause is a typing error, a supplier record change or a more serious problem.
Which invoice details should I check?
Compare the invoice with the transaction and check that its required particulars are present. Rule 46-oriented guidance highlights the supplier’s name, address and GSTIN, a consecutive invoice serial number, the issue date and recipient particulars where applicable.
Supplier, recipient and document identity
- Supplier: Match the name, address and GSTIN on the invoice against the GSTIN search and the supplier information for the purchase.
- Recipient: Check the recipient particulars where they apply, including whether the invoice is addressed to the purchasing entity in your records.
- Invoice number and date: Confirm that the serial number and issue date are present and correspond to the document you received and the purchase being recorded.
Goods or services and amounts
- Descriptions and quantities: Compare the line descriptions and quantities with the purchase order and delivery or service evidence. A correctly registered supplier can still issue an invoice that does not match what was ordered or supplied.
- HSN/SAC, where shown: Check the listed classification details against the transaction and your records. The presence of a code does not alone prove that the description or tax treatment is correct.
- Taxable value and rate: Reconcile each line’s taxable value and tax rate with the agreed transaction details and the applicable invoice information available to you.
- Tax amounts and total: Check the CGST/SGST or IGST split shown, total tax and invoice total against the line items. Recalculate the arithmetic rather than assuming a printed total is correct.
- Place of supply and tax split: Compare the place-of-supply details and the CGST/SGST-versus-IGST treatment with the transaction records. If the information does not align, ask for an explanation instead of treating a valid GSTIN as confirmation that the tax treatment is right.
These are consistency checks, not a replacement for determining the correct tax treatment for a particular transaction. If the classification, rate or place-of-supply treatment is uncertain, get the issue reviewed through your normal tax or accounting process before relying on the invoice.
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Are GST invoice numbers and dates subject to checks?
Yes. GSTN guidance says invoice numbers are alphanumeric, may be no more than 16 characters, use permitted separators and must be unique for the financial year. Check the number and date on the invoice against your purchase records and any other document for the same transaction.
A number that looks unusual is not automatically invalid: the guidance allows alphanumeric characters and permitted separators. The useful checks are whether the number falls within the stated constraints, whether the document is consecutive as required, and whether it appears to have been reused for another invoice in the same financial year. If your records show a duplicate, ask the supplier to confirm which document is valid and whether one was corrected or replaced.
Date checks matter because a supplier’s current GSTIN status does not necessarily establish the registration status for every earlier invoice date. Where your return system requires validation for the invoice date, make sure the date-specific status check is satisfied rather than treating a present-day search result as a historical record.
How do I verify an e-invoice QR code or IRN?
Use the GSTN e-Invoice QR Code Verifier or the IRP’s signed-JSON or QR verification function. Compare the signed information with both the invoice copy and your own purchase records.
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- Open the GSTN e-Invoice QR Code Verifier or use the relevant IRP verification function. Use a verifier that checks the signed QR or signed JSON, not merely a camera app that reads text from a code.
- Scan or submit the QR code or signed data as the verifier requests. Follow the tool’s instructions; the exact interaction can depend on the service you use.
- Compare the signed data with the document and your records: supplier GSTIN, recipient GSTIN, invoice number, date and invoice value. IRIS IRP’s recipient guidance specifically identifies these fields as information recipients can cross-check.
- Investigate any mismatch. A difference in the supplier or recipient GSTIN, number, date or value means the signed record and the copy in hand are not consistent; request clarification and a corrected document before relying on it.
- Check the IRN’s status on the e-invoice portal. Do not treat a QR scan alone as proof that the invoice remains uncancelled.
GSTN’s e-invoicing guidance states: “A GST invoice for B2B transaction will be valid only with a valid IRN.” This makes IRN verification a material check for a B2B e-invoice, but it does not resolve whether the supply occurred or whether the amounts and tax treatment match the purchase.
What should I do if an IRN is cancelled or cannot be verified?
Do not rely on a cancelled or unverifiable IRN without clarification. Recipient guidance says an e-invoice can be cancelled within 24 hours, so the status needs to be checked rather than inferred from the fact that a QR code appears on the copy.
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If the IRN is cancelled, cannot be verified or does not match the invoice, ask the supplier to explain the discrepancy and provide a corrected document where appropriate. Then check the replacement document against the transaction and verify its QR/IRN information and status. Keep the original and the clarification with your records so it is clear why the earlier document was not used.
If the supplier cannot resolve the discrepancy, hold the invoice from routine approval and escalate it through your accounting or tax review process. A readable QR code is not enough if its signed data conflicts with the invoice, and a GSTIN lookup cannot cure a cancelled or mismatched e-invoice record.
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Does a valid GSTIN prove that the invoice is real?
No. A valid GSTIN identifies a registration; it does not prove that goods or services were delivered, that the tax rate and amount are correct, or that the invoice is not cancelled or duplicated.
Complete the document checks by matching the invoice to the business evidence for the purchase:
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- Check delivery evidence for goods or evidence of the service for work billed.
- Compare the invoice amount with the agreed price and payment records, and resolve unexplained differences.
- Check whether another invoice or a corrected document already represents the same purchase.
- For an e-invoice, include signed QR/IRN consistency and current IRN status in the review.
The question is not only whether the supplier registration exists, but whether the document and the purchase agree. If any part does not reconcile, record the specific mismatch and get it resolved before relying on the invoice.
How can I compare two invoices or verification methods?
Use the same checks for both documents or methods, then compare the results side by side. This is useful when a supplier sends a revised invoice or when a paper copy and a verified e-invoice record do not appear to agree.
| Comparison point | What to compare | What a mismatch means for review |
|---|---|---|
| Supplier identity and GSTIN | Legal name, trade name, GSTIN status and returned taxpayer details | Confirm the correct supplier registration and ask about any identity discrepancy. |
| Invoice number and date | Serial number, issue date and whether the number appears on another invoice for the financial year | Resolve possible duplication, replacement or date-specific registration concerns. |
| Value and tax calculation | Line descriptions, taxable values, rates, tax amounts and invoice total | Reconcile arithmetic and agreed purchase terms; do not assume a matching GSTIN validates the amounts. |
| Place of supply and tax split | Place-of-supply details and CGST/SGST or IGST treatment | Ask for an explanation if the invoice treatment conflicts with the transaction records. |
| Signed QR or IRN | Supplier GSTIN, recipient GSTIN, invoice number, date and value in signed data, plus IRN status | Clarify mismatched, cancelled or unverifiable e-invoice details before relying on the document. |
| Underlying purchase | Purchase order, delivery or service evidence, quantities, pricing and payment records | Determine whether the invoice corresponds to the actual purchase, not just a registration. |
Does every supplier need to issue an e-invoice?
Do not apply an old turnover threshold as if it were a current universal rule. GSTN’s dated overview records a ₹5 crore aggregate-turnover threshold from 1 August 2023, but e-invoice applicability, exemptions and thresholds are notification-driven and may change.
For a current compliance decision, check the latest GSTN notification for the relevant taxpayer and transaction rather than relying on the 2023 figure alone. Where e-invoicing applies to the B2B invoice, GSTN’s guidance says the invoice is valid only with a valid IRN; where applicability is uncertain, confirm it before treating the absence of an IRN as conclusive.
Frequently Asked Questions
Can a supplier’s GST registration details change after I receive an invoice?
A lookup reflects the details and status returned when you perform it; it should not be treated as a permanent snapshot of the supplier’s records. If a later lookup differs from your invoice, retain the invoice-date context and ask the supplier to explain the change rather than silently replacing your original records.
What is the difference between the invoice QR code and the IRN?
The QR code carries signed invoice information that can be cross-checked, while the IRN is the invoice reference whose status can be checked on the e-invoice portal. For review, use both checks where available: matching QR data addresses the document details, and IRN status addresses whether the record is valid or cancelled.
Should I keep evidence of a GSTIN or e-invoice check?
Yes. Retain the invoice copy, verification result or the details of the check, any supplier clarification, and the purchase or delivery evidence that resolved a mismatch. This creates a traceable record of why your business relied on a particular document.
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