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To check whether an Indian GST invoice is genuine and its tax looks right, verify the supplier’s GSTIN, review the required invoice details, and validate the signed QR code or IRN if it is an e-invoice. Then compare the document with the actual goods or service, transaction records, applicable rate, and place of supply. A valid e-invoice check supports the authenticity of the reported invoice data; it does not establish that the supply was classified or taxed correctly.
1. Check the invoice details
Use CBIC’s invoice rules as the checklist. Rule 46 sets out the particulars for a tax invoice, subject to requirements that vary by document type and applicable exceptions.
- Supplier’s name, address, and GSTIN.
- A serial number unique for the financial year and the invoice issue date.
- Recipient details where required.
- Description of the goods or services and the applicable HSN or SAC. For goods, check quantity and unit where relevant.
- Total and taxable value, tax rate, and tax amount.
- Place of supply for an inter-State supply, an indication of whether tax is payable on reverse charge, and the supplier’s signature or digital signature as applicable.
Rule 46(l) specifies the “rate of tax (central tax, State tax, integrated tax, Union territory tax or cess);” Compare the fields with the transaction rather than assuming every invoice type must have an identical layout.
2. Verify the supplier and any e-invoice evidence
Check the supplier’s GSTIN using the GST system. A GSTIN check helps confirm the identity details associated with that number, but it does not prove that the invoice describes a real supply or that its tax treatment is correct.
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If the document is an e-invoice, validate its signed QR code or signed JSON using an official or authorized verification route. GSTN lists authorized e-invoice verification apps, and the IRP provides e-invoice tools. Compare the verified supplier and recipient GSTINs, invoice number, date, value, and relevant IRN details with the invoice you received and your order or receipt. See IRIS IRP’s explanation of how recipients receive e-invoices.
Do not treat a QR image or a string that merely looks like an IRN as proof. The signed data must validate, and its details must match the document and transaction.
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Search the IRN as a separate cross-check
If you have the IRN, search it using the IRP’s e-invoice search function. The IRP describes this as a way to view status, acknowledgement details, the signed QR code, and the signed invoice. See IRIS IRP’s guidance on viewing e-invoices. A successful search supports the authenticity of the reported e-invoice data, but does not decide whether the goods or service were classified correctly or the right rate was used.
3. Check whether the tax rate fits the actual supply
An invoice’s stated rate alone is not enough to show that the charge is correct. First identify exactly what was supplied, its applicable classification, the relevant date, and whether an exemption or concession applies. Use the current CBIC GST rates schedule and relevant notifications to check that supply. Rates can depend on the precise goods or service and transaction facts; a familiar rate for a similar item may not apply.
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A general checklist cannot determine a product- or service-specific rate without those details. For a classification, exemption, or input tax credit dispute, get advice based on the transaction documents and current law.
4. Check the tax type and arithmetic
Whether a supply is intra-State or inter-State depends on the supplier’s location and the legal place-of-supply rules. That determines whether the invoice should show CGST plus SGST or UTGST, or IGST. Consult the relevant provisions of the Integrated Goods and Services Tax Act rather than inferring the tax type from the parties’ addresses alone.
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Recheck the calculation using the taxable value, applicable discounts or abatements, and stated rate. Confirm that the resulting tax amount and the tax type shown agree with the transaction facts. If the base, rate, or amount does not reconcile, ask the supplier to explain the calculation.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.5. Reconcile any mismatch before drawing a conclusion
Compare the invoice with the verification result, order, goods receipt or service record, and payment record. Check these points together:
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- Wraparound cover attached to back to place between sets
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- Supplier identity and GSTIN.
- Invoice particulars and signed QR/IRN data where e-invoicing applies.
- Goods or service description and HSN/SAC.
- Taxable value and arithmetic.
- Applicable rate, exemption, or notification.
- Place of supply and the use of IGST or CGST plus SGST/UTGST.
If details conflict, preserve the invoice and verification result, compare them with the order and receipt, and request an explanation or corrected document from the supplier. A mismatch warrants investigation, but it does not by itself prove fraud.
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