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To verify a GST invoice, first search the supplier’s GSTIN on the GST portal or an authorised IRP search tool and compare the returned legal name, trade name, address, PIN code, registration type and status with the invoice. Then check the invoice’s mandatory particulars, numbering, dates, tax calculation and—if it is an e-invoice—the signed QR code and IRN. Finally, reconcile the document with your purchase order, delivery evidence, quantities and payment records.
An active, matching GSTIN and a valid signed QR/IRN establish strong documentary consistency, but they do not prove that goods or services were actually supplied, that the tax treatment is correct, or that the document has not been cancelled or duplicated.
How do I check whether a supplier’s GSTIN is genuine?
Use the GST portal’s taxpayer search or an authorised IRP GSTIN-status/search function. Enter the 15-character GSTIN exactly as printed, then compare the official result with the supplier and invoice.
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- Open the official taxpayer search. Use the GST portal or an authorised IRP search facility rather than relying on a screenshot or a third-party directory.
- Enter the GSTIN. Check every character. A transposed digit can return a different taxpayer or no result.
- Record the returned identity details. The official search returns the taxpayer’s legal name, trade name, address, PIN code, registration type and registration status.
- Compare each field. The legal name, trade name, address and PIN should make sense for the supplier shown on the invoice and in your purchase records. A trade name can differ from the legal name, so do not reject an invoice merely because those two names are not identical; investigate whether the relationship is clear.
- Check status against the invoice date. Where your return or accounting process requires it, confirm that the GSTIN was active or registered on the date of supply shown on the invoice, not only on the day you performed the search.
Save the search result with the invoice record when your controls require an audit trail. The status displayed today can change later, while the invoice relates to a particular transaction date.
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What particulars must a GST invoice contain?
Rule 46-oriented guidance requires core supplier, invoice and transaction particulars. A document that omits a required field or contains inconsistent values needs clarification before you treat it as reliable.
Supplier and recipient identity
- Supplier name, address and GSTIN.
- Recipient particulars where applicable, including the recipient GSTIN for a registered business transaction.
- Names and addresses that are consistent with the GSTIN search result and your purchase order.
Invoice identity
- A consecutive invoice serial number.
- Issue date.
- A number that follows the supplier’s numbering sequence for the relevant financial year.
Supply and tax details
- Description of the goods or services.
- HSN or SAC where shown or required for the transaction.
- Taxable value.
- Applicable tax rate.
- CGST and SGST split for an intra-State supply, or IGST for an inter-State supply.
- Total tax and the final invoice value.
Check the arithmetic rather than accepting a printed total. Recalculate tax on the taxable value, verify that the component taxes add to the stated total tax, and confirm that taxable value plus tax equals the invoice total after any disclosed adjustments. The tax components must also fit the stated place-of-supply treatment.
How can I validate the invoice number and date?
Invoice numbering is a separate control from GSTIN status. GSTN guidance says invoice numbers are alphanumeric, can be no more than 16 characters, may use permitted separators and must be unique for the financial year.
- Count and inspect the serial. Confirm that the number is at most 16 characters and uses only the supplier’s permitted alphanumeric format and separators.
- Look for sequence integrity. Compare the invoice with nearby invoices from the same supplier or with the supplier’s statement. A duplicate number, unexplained gap or reused number can indicate a duplicated document or a bookkeeping error.
- Check financial-year uniqueness. The supplier may restart a sequence in a new financial year, but the same serial should not be used twice within that year for separate invoices.
- Compare dates. The issue date should be plausible for the purchase order, dispatch or service period and payment records. If the GSTIN was not active on the invoice date, ask the supplier to explain and correct the document before relying on it.
Do not infer authenticity from a sophisticated-looking serial number. A correctly formatted number can still describe a transaction that never occurred, and a genuine supplier can make a clerical numbering mistake that requires correction.
How do I verify an e-invoice QR code or IRN?
For an e-invoice, use the GSTN e-Invoice QR Code Verifier or the IRP’s signed-JSON/QR verification function. The aim is to compare signed, system-generated data with the invoice copy and your own records.
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- Use the official verifier. Scan the QR code with the GSTN verifier or use the IRP verification function. Avoid treating a QR reader that merely displays text as proof that the code is genuine.
- Check the signed data. Compare the supplier GSTIN, recipient GSTIN, invoice number, invoice date and invoice value returned from the signed QR or JSON.
- Compare against the visible invoice. Every key value should match the printed or electronic invoice. A QR that resolves successfully but contains a different recipient, date or value is a material mismatch.
- Compare against your records. Match the verified values to the purchase order, goods-received record or service acceptance record and your accounting entry.
- Keep the verification evidence. Retain the verified QR/JSON output or a record of the verification according to your document-retention policy.
IRIS IRP explains that recipients can cross-check the supplier GSTIN, recipient GSTIN, invoice number, date and invoice value in the Signed QR with their own records or the physical copy received. A QR code by itself is not a substitute for checking the underlying supply and tax calculation.
What does an IRN check tell me?
The Invoice Reference Number (IRN) links an e-invoice to the reporting system. Search the IRN on the e-invoice portal and make sure the result corresponds to the invoice you received.
- Match the core fields. The IRN result should identify the same supplier, recipient, invoice number, date and value as the document and signed QR.
- Check whether it is current. An invoice that was cancelled or cannot be verified should not be treated as settled merely because it once had an IRN.
- Ask for a corrected document when necessary. Recipient guidance states that an e-invoice can be cancelled within 24 hours. If the IRN is cancelled or unverifiable, obtain supplier clarification and a corrected document before relying on it.
GSTN’s e-invoicing guidance states: “A GST invoice for B2B transaction will be valid only with a valid IRN.” That statement concerns invoices within the e-invoicing requirement; it does not turn the IRN into proof that the goods or services were delivered.
Does a valid GSTIN prove that an invoice is real?
No. A GSTIN identifies a registration, not the existence, quantity, price or delivery of a particular supply. Even when the registration is active and the invoice fields are complete, you must establish that the transaction occurred and that the tax treatment is appropriate.
Reconcile the commercial transaction
- Match the invoice to the purchase order or approved contract.
- Verify quantities, specifications and prices against the order and receiving records.
- Check delivery notes, goods-received records, service acceptance or other evidence that the supply occurred.
- Confirm that the payment beneficiary and amount agree with your approved supplier and payment records.
- Investigate duplicate invoice numbers, repeated QR data or the same value appearing in more than one document.
Check the tax treatment
Confirm that the place of supply and the CGST/SGST versus IGST treatment fit the transaction. Check the HSN or SAC description, taxable value and rate against the actual goods or services and the terms agreed with the supplier. A genuine supplier can still issue an invoice with the wrong rate, wrong tax component or wrong description.
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How should I compare two invoices or two verification methods?
When two documents appear to represent the same purchase, compare identity, numbering, tax data, e-invoice evidence and commercial records in a fixed order. This prevents a valid-looking QR code from distracting you from a duplicate or altered invoice.
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|---|---|---|
| Supplier identity | Legal name, trade name, GSTIN, address and status | Wrong supplier, altered document or an explanation needed for a legal-name/trade-name difference |
| Invoice identity | Serial number, issue date and financial-year uniqueness | Duplicate, reused or incorrectly dated invoice |
| Tax calculation | Taxable value, rate, CGST/SGST or IGST, total tax and invoice total | Arithmetic error, wrong place-of-supply treatment or incorrect rate |
| E-invoice evidence | Signed QR data, IRN result and cancellation status | Altered copy, cancelled document or an invoice outside the verified record |
| Commercial evidence | Purchase order, quantities, delivery or service evidence and payment | Invoice for a transaction that was not delivered, was duplicated or differs from what was ordered |
If one method is unavailable, do not treat the other as conclusive. For example, a GSTIN search can confirm registration details, while only the IRN and signed QR checks can confirm the e-invoice data reported for that document.
What should I do when a GSTIN, invoice or QR check fails?
Classify the failure before deciding whether to reject the invoice. A typographical error, a changed business address and a cancelled IRN require different responses.
The GSTIN returns no taxpayer or a different taxpayer
Re-enter the number manually and compare each character with the invoice. If the result still does not match, stop processing the invoice as valid, contact the supplier through a known channel and request a corrected invoice or an explanation supported by the official registration details.
The legal name differs but the trade name is familiar
Compare both names returned by the search. Ask the supplier to show how the trade name is used by the registered legal entity, and ensure that the GSTIN and address on the invoice belong to that entity.
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The GSTIN is active now but not on the invoice date
Escalate the date issue to the supplier and your tax or finance reviewer. Do not silently substitute the current status for the historical status relevant to the invoice.
The QR code will not verify or the signed values differ
Obtain the original electronic invoice or a fresh export from the supplier’s invoicing system and run the official verifier again. If the IRN is cancelled, unverifiable or belongs to different values, request a corrected document and retain the failed result with your review notes.
The arithmetic or tax split is wrong
Ask for a revised invoice showing the correct taxable value, rate and tax components. Keep the original document linked to the correction so that your records explain why the first version was not used.
The document passes technical checks but delivery evidence is missing
Hold the invoice for commercial confirmation. Obtain the purchase order, receipt or service-acceptance evidence and resolve quantity, price or payment discrepancies before treating the document as a complete transaction record.
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E-invoice applicability is notification-driven and can change. GSTN’s dated overview records an aggregate-turnover threshold of ₹5 crore and above from 1 August 2023, but that historical figure is not a guarantee of the threshold or exemptions in 2026.
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Before asserting that a supplier must issue an e-invoice, check the latest GSTN notification for the supplier’s turnover, taxpayer category, transaction type and any applicable exemption. If e-invoicing applies, use the IRP, signed QR and IRN checks; if it does not, the ordinary GST invoice checks still matter.
What is a practical GST invoice verification checklist?
Use this sequence for each invoice and record the result beside the document number.
- Search the supplier GSTIN on the GST portal or an authorised IRP tool.
- Compare legal name, trade name, address, PIN code, registration type and status.
- Confirm the GSTIN was active or registered on the invoice date when your process requires that check.
- Check supplier and recipient particulars required for the transaction.
- Check the serial number, date and financial-year uniqueness.
- Review descriptions, HSN/SAC where shown, taxable value and rate.
- Recalculate tax and confirm the CGST/SGST or IGST split and invoice total.
- For an e-invoice, verify the signed QR or JSON and compare supplier GSTIN, recipient GSTIN, number, date and value.
- Search the IRN and check that it is not cancelled or unverifiable.
- Match the invoice to purchase, delivery or service evidence and payment records.
- Resolve every mismatch with a documented correction or explanation before relying on the invoice.
Frequently Asked Questions
Can I verify a GSTIN using only the name of the supplier?
The dependable check is performed with the GSTIN itself, because the official result is tied to that registration number. Ask the supplier for the exact GSTIN printed on its invoice and then compare the returned legal name, trade name and address.
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No. A generic camera can read characters without validating the signed e-invoice data. Use the GSTN QR verifier or an IRP verification function and compare the returned fields with the invoice and your purchase records.
What if an e-invoice was cancelled after I received it?
Treat the cancellation as a document exception, even if the original PDF and QR still exist. Ask the supplier for the reason and a valid corrected document, then retain the cancellation result and replacement together in your records.
Do ordinary GST invoices always need an IRN?
IRN requirements apply to taxpayers and transaction categories covered by the current e-invoicing notifications, not automatically to every GST invoice. Applicability and thresholds can change, so check the latest GSTN notification for the supplier and transaction before drawing a compliance conclusion.
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