A GST tax invoice in India must include the particulars required by Rule 46, with some fields applying only to particular recipients or transactions. If your business falls within a notified e-invoicing class, formatting a PDF is not enough: the required document data must also be reported to an Invoice Registration Portal (IRP) to receive an Invoice Reference Number (IRN). Check the invoice type, transaction and current notifications before issuing a document.
Which GST sales document do you need?
Start with the transaction’s tax treatment rather than choosing a document template by habit. A tax invoice and a bill of supply serve different purposes.
| Document | When it is used | Tax particulars |
|---|---|---|
| Tax invoice | For a taxable supply when the registered supplier is required to issue a tax invoice. | Includes the applicable tax rate and tax amount, with the tax components identified as applicable. |
| Bill of supply | CBIC’s sectoral FAQ identifies exempt supplies and supplies by a person paying tax under the Composition Scheme as cases where a bill of supply is issued instead of a tax invoice. | Does not show a tax rate or tax amount because GST is not collected on that document. |
That distinction is a starting point, not a substitute for checking the provision that applies to a particular supply. Consult the relevant GST rule or a tax professional for edge cases.
What must a GST tax invoice contain?
CBIC Rule 46 sets out the particulars for a tax invoice. Its requirements are subject to provisos, applicable notifications and transaction-specific conditions, so not every field applies in the same way to every invoice.
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- Supplier identity: the supplier’s name, address and GSTIN.
- Invoice number: a consecutive serial number unique for the financial year. Rule 46 permits multiple series and specified characters.
- Issue date: the date the invoice is issued.
- Recipient identity: for a registered recipient, the recipient’s name, address and GSTIN or UIN.
- Unregistered recipient and delivery details: in the circumstances specified by Rule 46, include the recipient’s name and address and the delivery address, along with the State name and code. This includes a taxable supply valued at ₹50,000 or more; the rule also addresses cases below that value when the recipient requests the details.
- Goods or services: a description; for goods, quantity and unit or unique quantity code. Include the applicable HSN code for goods or accounting code for services, subject to current notifications and the requirements for the relevant class of taxpayer.
- Values: total value and taxable value, taking applicable discounts or abatements into account.
- Tax: applicable tax rate and amount, with the tax components identified as applicable.
- Place of supply: for an inter-State supply, state the place of supply and the State name and code.
- Delivery address: include it when it differs from the place of supply.
- Reverse charge: state whether tax is payable on a reverse-charge basis.
- Authentication: the supplier’s or authorised representative’s signature or digital signature, subject to the electronic-invoice exception and other applicable provisions.
Do not assume an old HSN/SAC summary gives the right digit count for your business. Requirements can depend on notifications and taxpayer class. The GST portal’s advisory of 25 April 2025 concerns phased HSN reporting in Table 12 of GSTR-1/1A; return-reporting guidance is not, by itself, a universal rule for what must be printed on every invoice.
When is e-invoicing required?
E-invoicing is a reporting and authentication workflow for specified taxpayers and documents, not simply an invoice saved as a PDF or sent by email. The supplier reports the required data to an IRP, which generates an IRN and returns associated validated information. IRP print guidance describes including the IRN and QR code on the e-invoice.
IRIS IRP mandate guidance lists an annual aggregate turnover (AATO) threshold of ₹5 crore effective 1 August 2023, with preceding financial years from FY 2017–18 considered. That figure does not settle applicability by itself: the notified taxpayer class, exclusions and the relevant document type also matter. Check the current notification and your exact circumstances rather than relying on turnover alone.
How the IRP process works
- Prepare and validate the data. Check supplier and customer identifiers, document number, transaction details and all mandatory or conditional fields against the applicable schema.
- Report the document. Submit the required invoice, credit note or debit note data through an authorized system or API, or an available IRP portal workflow.
- Use the IRP response. Receive the IRN and associated information, then include the required IRN and QR information on the issued document as prescribed.
- Reconcile related records. Check that the reported data aligns with returns and related e-way bill processes where applicable.
The IRP registers and authenticates the reported data; it does not create the supplier’s commercial invoice for them. A paper invoice book or standalone PDF template cannot perform IRP registration.
Additional reporting deadline for larger taxpayers
According to an IRIS IRP production release dated 31 March 2025, effective 1 April 2025, taxpayers with AATO of ₹10 crore or more must report invoices, credit notes and debit notes within 30 days of the document date. The IRP restricts later IRN generation for this covered class. The release refers to official GST advisory 543; check that advisory and the current portal requirements for the applicable taxpayer and document.
When must the invoice be issued?
Invoice timing depends on the type of supply and the applicable provision. Do not use one deadline for every GST invoice: goods and services can have different rules, and continuous supplies, transport conditions and special categories may involve further requirements. Confirm the rule for the specific supply before setting an invoicing deadline.
Common GST invoice and e-invoice mistakes
- Wrong supplier or buyer GSTIN: compare each GSTIN with the correct legal entity’s master data before issuing or reporting the document. IRP operational guidance identifies invalid GSTINs as a source of failed validation.
- Duplicate invoice number or IRN: check the document series and prior registration before resubmitting. A duplicate can prevent successful processing.
- Missing or malformed fields: validate the current schema, including fields that are mandatory only for a particular transaction. A document that looks complete on screen can still fail system validation.
- PDF mistaken for e-invoice registration: when the mandate applies, a formatted invoice alone does not establish that its data was registered with an IRP. Check for the required IRN and QR information.
- Late IRP reporting: apply the 30-day window to the AATO ₹10 crore-and-above class described in the IRIS IRP release, rather than assuming the same deadline applies to every taxpayer.
- Wrong document type: determine whether the supply calls for a tax invoice or bill of supply before using a template.
- Outdated HSN assumptions: verify current notifications and taxpayer-specific requirements instead of copying a digit count from an older checklist.
A practical pre-issue check
- Confirm the supply’s tax treatment and select the appropriate document type.
- Check the supplier, recipient, invoice series and issue date.
- Review values, discounts, tax components, place of supply and delivery details as applicable.
- Verify HSN/SAC and other conditional fields against current requirements.
- If e-invoicing applies, validate and report the document in time, then check the IRP response and required QR information.
- Reconcile the issued document with the records used for returns and related e-way bill processes where relevant.
If validation fails or a mistake is discovered, identify the specific field or reporting issue and correct it promptly using the applicable GST and IRP process. Do not assume that every error automatically makes an invoice invalid, denies input tax credit or triggers a particular penalty; the legal consequence depends on the provision and facts.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Choosing a manual or integrated workflow
For a business assessing invoice software or an accounting workflow, compare its compliance functions rather than its visual template alone:
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- Does it help determine whether the taxpayer and document fall within a notified e-invoicing class?
- Does it validate GSTINs, duplicate document numbers and mandatory or conditional fields before submission?
- Can it submit data to an IRP through an available portal or API integration and handle IRN/QR output?
- Can it meet the applicable 30-day reporting window for taxpayers with AATO of ₹10 crore or more?
- Does it retain a usable audit trail and support reconciliation with returns and e-way bill processes where relevant?
These are workflow criteria, not an endorsement of any particular product. A paper invoice book may help record details manually, but it does not register an e-invoice with an IRP.
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