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To verify a GST invoice, first search the supplier’s GSTIN on the official GST portal or an authorized Invoice Registration Portal (IRP) tool and match 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 calculations and place-of-supply treatment. If it is an e-invoice, scan or upload its signed QR code, confirm the Invoice Reference Number (IRN), and compare the signed data with your records.
A matching active registration, complete invoice and valid signed QR/IRN are strong evidence that the document is internally consistent. They do not, by themselves, prove that goods or services were delivered, that the tax treatment is correct, or that the document has not been cancelled or duplicated. Those points require reconciliation with purchase orders, delivery evidence and payment records.
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Use the GST portal’s taxpayer-search facility, or an authorized IRP GSTIN-status/search function, and compare every returned field with the invoice and the supplier’s information. Do not rely on a GSTIN printed on a PDF or supplied in an email without checking the registration record independently.
- Open an official search tool. Choose the GST portal’s GSTIN/taxpayer search or a search function provided by an authorized IRP. Use the GSTIN exactly as shown on the invoice.
- Record the returned taxpayer details. The official search can return the taxpayer’s legal name, trade name, principal address, PIN code, registration type and registration status.
- Compare identity fields. Check that the legal name and address correspond to the contracting supplier. A business may use a trade name that differs from its legal name, but both should make sense together and the invoice should identify the registered supplier.
- Check status and timing. An “active” result is useful only in context. Where the return or credit process requires it, confirm that the GSTIN was active or registered on the invoice date, not merely active when you performed the search.
- Save evidence. Keep a dated copy or screenshot of the search result with the invoice file so that you can show what the registration record said when you checked it.
What the search result can and cannot establish
The search confirms the identity and registration status associated with a GSTIN. It does not authenticate the invoice’s quantities, prices, delivery, bank payment or tax calculation. A fraudster can place a real business’s GSTIN on a false invoice, so identity verification is the first check rather than the final one.
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Which details must I check on a GST invoice?
Read the invoice as a transaction document, not just as a tax number. Rule 46-oriented guidance requires core supplier and invoice particulars, while a sound review also tests the description, value, tax rate and totals against what you ordered and received.
| Invoice element | What to verify | Warning signs |
|---|---|---|
| Supplier identity | Supplier name, address and GSTIN match the registration search and the contracting party. | GSTIN belongs to a different legal entity, address is unrelated, or the number is missing. |
| Recipient details | Your name, address and GSTIN where recipient particulars are applicable; confirm the bill is addressed to the correct entity or branch. | Wrong GSTIN, another group company, or an address that prevents you from matching the purchase. |
| Invoice serial number | A consecutive, unique number for the supplier’s financial year, following the permitted format. | Duplicate number, unexplained gap, retroactive-looking date, or a number longer than the allowed limit. |
| Issue date | Date is present and fits the delivery, service period and purchase order. | Date predates the order without explanation, falls outside the supply period, or does not align with the GSTIN’s registration status. |
| Description and classification | Line descriptions, quantities and HSN or SAC where shown correspond to the goods or services actually supplied. | Generic wording, wrong quantity, or a classification that does not fit the purchase. |
| Taxable value | Line extensions, discounts and the taxable subtotal agree with your order and calculation. | Subtotal differs from agreed pricing or the tax is calculated on an unexplained base. |
| Tax rate and split | Rate is stated where applicable; CGST/SGST or IGST is applied consistently with the place of supply. | Both CGST/SGST and IGST appear for the same taxable line, or the split does not fit the transaction’s place of supply. |
| Total tax and invoice total | Tax components add up to the total tax and the total tax plus taxable value (after documented adjustments) equals the invoice total. | Rounding or arithmetic differences that cannot be explained, or totals that change between pages. |
Keep the qualification “where applicable” in mind for recipient information and HSN/SAC fields. The exact particulars can vary with the transaction, but a missing supplier GSTIN, supplier address, invoice number or issue date is a fundamental document problem that should be resolved before you rely on the invoice.
How should I check the invoice number and date?
GSTN guidance describes invoice numbers as alphanumeric, no more than 16 characters, using permitted separators and unique for the financial year. Test the number and date against the supplier’s sequence and your own purchase chronology rather than treating any plausible-looking number as valid.
- Count and inspect the serial. Confirm it stays within the 16-character limit and uses only the supplier’s permitted separators. A prefix or series can be legitimate, but the supplier should apply it consistently.
- Check uniqueness in your records. Search your accounting system, email archive and receiving records for the same supplier GSTIN, invoice number and financial year. A duplicate can indicate a reissued document or an accidental double booking.
- Compare the sequence. If you have earlier and later invoices from the same supplier, look for a coherent series. A gap is not automatically fraudulent, but ask the supplier to explain cancelled or unused numbers.
- Relate the date to the supply. Compare the issue date with the purchase order, dispatch or service completion evidence and the payment schedule.
- Check registration at that date when required. A currently active GSTIN does not prove that the registration was active on an earlier invoice date. Use the status information required by the relevant return or credit process.
How do I verify an e-invoice QR code and IRN?
Use the GSTN e-Invoice QR Code Verifier or the IRP’s signed-JSON/QR verification function. A successful check should produce signed data that you compare with the invoice and your purchase records; visually scanning a QR code without validating its returned data is not enough.
Step 1: Read the signed QR data
Scan the QR code with the GSTN verifier or an authorized IRP tool. If you have the signed JSON supplied with the e-invoice, use the IRP verification function instead of relying on an image pasted into a document.
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Step 2: Compare the fields that identify the transaction
At minimum, compare the signed supplier GSTIN, recipient GSTIN, invoice number, invoice date and invoice value with the printed or electronic invoice and your own records. A mismatch means the QR belongs to a different document, an altered copy or an incorrectly prepared invoice.
Step 3: Search the IRN
Search the IRN on the e-invoice portal and confirm that it is found and relates to the same supplier, recipient and invoice. For a B2B transaction, GSTN states that the GST invoice is valid only with a valid IRN. If the IRN cannot be found or the result is inconsistent, pause posting or credit reliance until the supplier provides a corrected, verifiable document.
Step 4: Check cancellation status
Recipients can encounter an e-invoice that the supplier cancelled. Recipient guidance states that an e-invoice can be cancelled within 24 hours. A cancelled IRN, or one that cannot be verified, requires supplier clarification and a corrected document before you rely on it.
What a valid QR or IRN does not prove
The signed data authenticates key invoice fields and links the document to the IRP record. It does not prove that the truck arrived, that the service was performed, that the quantity is correct or that the rate selected by the supplier is legally appropriate for your facts. Those checks remain part of your transaction reconciliation.
Does a valid GSTIN prove that the invoice is real?
No. A GSTIN identifies a registration; it does not establish that the named business supplied the goods or services described. Treat a valid GSTIN as one layer of evidence and reconcile the invoice to independent commercial records.
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Match the invoice to the order
Compare the invoice number, supplier, item or service description, agreed price, quantity and delivery terms with the purchase order, contract or approved quotation. Investigate changes that are not supported by a revised order or written approval.
Match it to receipt or performance
For goods, retain delivery notes, goods-received records, transport documentation or warehouse entries. For services, keep acceptance records, timesheets, milestones or other evidence that the work occurred. The evidence should identify what was received and when.
Match it to payment
Reconcile the payable amount and payment date to your bank or accounting records. A request to pay a new bank account, a payment to an unrelated entity or a mismatch between the invoice beneficiary and the contracting supplier deserves separate confirmation through a trusted contact channel.
Check for duplicates
Search by supplier GSTIN, invoice number, invoice date, taxable value and total value. Duplicate uploads, a replacement invoice and a credit-adjusted invoice can otherwise cause the same supply to be recorded twice.
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Tax components should fit the transaction’s place-of-supply treatment. Check the place of supply shown or documented for the transaction, then confirm that the invoice uses a CGST/SGST split or IGST in a way that is consistent with that treatment.
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- Taxable value: Recalculate each line and the subtotal from the agreed price, quantity and documented discounts.
- Rate: Confirm that the stated rate is the rate being applied to the described goods or services and that the same rate is used consistently across the relevant lines.
- Split: Ensure CGST and SGST amounts are each calculated from the taxable value when that structure applies, or that IGST is used when the transaction calls for it.
- Totals: Add the tax components and compare the result with the invoice’s total tax and grand total, allowing only explainable rounding.
If the supplier cannot explain an incorrect split or rate, do not “fix” the invoice yourself. Ask for a corrected document and preserve the original for your audit trail.
What should I do when the GSTIN or invoice check fails?
Classify the failure before deciding whether to reject, hold or correct the document. A failed search, a data mismatch and a commercial discrepancy have different remedies.
| Failure | Likely issue | Practical response |
|---|---|---|
| GSTIN not found | Typographical error, inactive registration or fabricated number. | Re-enter the number, ask the supplier to confirm it, and hold reliance until an official result is available. |
| Returned legal name or address differs | Wrong entity, branch confusion or outdated invoice master data. | Ask for an explanation and corrected invoice; verify the contracting entity and recipient details. |
| Status is not active for the invoice date | Invoice may fall outside the registration period or the required validation window. | Escalate to your tax adviser or compliance team before claiming credit or accepting the document. |
| Invoice number is duplicated | Duplicate booking, reissue or a supplier sequencing error. | Obtain written clarification and a corrected or clearly marked replacement document. |
| QR does not verify or IRN is missing | Altered copy, failed reporting, wrong QR or an e-invoice that was cancelled. | Search the IRN independently and request a valid, corrected e-invoice before relying on it. |
| Tax arithmetic or split is wrong | Data-entry error, wrong rate or incorrect place-of-supply treatment. | Send the calculation to the supplier and require a corrected invoice rather than editing the received copy. |
| Invoice matches the GSTIN but supply cannot be evidenced | Commercial or procurement risk rather than an identity failure. | Check receiving, service-acceptance and payment records; escalate suspected fictitious or duplicate transactions. |
When is e-invoicing required, and why should I check the latest notice?
E-invoice applicability is notification-driven. A GSTN overview recorded a ₹5 crore aggregate-turnover threshold from 1 August 2023, but that is a dated implementation figure, not a guarantee of the threshold or exemptions in 2026.
Before making a current compliance decision, check the latest GSTN notification for the supplier’s turnover, taxpayer category, transaction type and any exemption. Do not infer that an invoice is invalid merely because it has no QR/IRN when the supplier was outside the applicable scope, and do not assume that a large supplier is exempt because an older invoice lacked one.
Where e-invoicing does apply, the supplier generally creates the invoice in an accounting, billing or enterprise resource planning system and reports it through an authorized IRP. Your verification should therefore include both the underlying invoice and the IRP-generated signed information.
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Should I compare two invoices or two verification methods?
When reviewing a replacement invoice, credit-adjusted invoice or two possible copies, compare the same core axes rather than choosing the cleaner-looking PDF.
| Comparison axis | Questions to ask |
|---|---|
| Supplier identity | Is the legal entity and GSTIN the same, and does the registration status fit the invoice date? |
| Number and date | Is one number unique for the financial year, and which date aligns with the actual supply? |
| Value and tax | Do taxable value, rate, tax components and total agree, or is one document an authorized adjustment? |
| Place of supply | Does the CGST/SGST versus IGST treatment fit the documented place of supply? |
| QR and IRN | Does the signed QR data identify the same supplier, recipient, number, date and value, and is the IRN valid rather than cancelled? |
| Commercial evidence | Which copy matches the purchase order, delivery or service acceptance and payment records? |
If two documents differ, retain both, label their status in your records and obtain the supplier’s written explanation. Do not delete the first copy simply because a second PDF looks more complete.
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What is a practical verification checklist for accounts payable?
Use the following sequence for each invoice, with additional e-invoice checks when applicable:
- Obtain the invoice from an approved supplier channel and record when it was received.
- Search the supplier GSTIN independently and save the returned legal name, trade name, address, PIN, registration type and status.
- Compare those identity fields with the invoice, purchase order and supplier master.
- Check supplier and recipient particulars, serial number, issue date, descriptions, HSN/SAC where shown, taxable value, rate, tax split, total tax and invoice total.
- Confirm number uniqueness for the supplier’s financial year and check that the date fits the supply.
- For an e-invoice, verify the signed QR or JSON, compare the supplier GSTIN, recipient GSTIN, number, date and value, and search the IRN.
- Check whether the IRN is cancelled and whether the supplier was within the current e-invoice rules.
- Match quantities or service milestones to receiving and acceptance evidence.
- Match the payable amount and beneficiary to payment records and investigate duplicates.
- Record exceptions, correspondence and the final disposition: accepted, held, corrected or rejected.
This file gives a reviewer a traceable path from registration identity to the actual business transaction without treating any single screen, QR code or invoice layout as conclusive.
Frequently Asked Questions
Why can the legal name on a GST search differ from the name customers know?
A registered entity may trade under a different business name. The difference is not automatically a problem, but the invoice, contract and payment beneficiary should connect the trade name to the legal entity returned by the GST search; unexplained differences should be corrected before processing.
Can I verify an invoice if the supplier sends only a PDF and no signed JSON?
Yes, use the QR verifier or IRP search if the document is an e-invoice. If the QR is absent, unreadable or returns different data, ask the supplier for the IRP-generated details rather than accepting an image or manually edited copy.
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What should I check when a supplier replaces an invoice?
Keep the original and replacement together, identify whether the change is a correction or an adjustment, and compare their numbers, dates, values, tax treatment and IRN status. Book only the document that your supplier and transaction records support, with the explanation retained.
Does an active GST registration guarantee that input tax credit can be claimed?
No. Registration status addresses the supplier’s identity, not whether the supply occurred or whether the invoice’s classification and tax amount are correct. Your credit decision should also follow your organization’s reconciliation and tax-review controls.
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