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In India, a GST e-invoice is not a different invoice created by the government: it is the supplier’s GST invoice reported to an authorized Invoice Registration Portal (IRP) for validation and an Invoice Reference Number (IRN). A business must use that added reporting process when it falls within the notified class, the document and transaction are in scope, and no applicable exemption applies. Other businesses still issue the GST document required for the transaction, without IRP reporting solely because they are GST-registered.
The notified turnover threshold established by the cited amendment is more than ₹5 crore, tested on a PAN basis against aggregate turnover in any preceding financial year since 2017–18. Turnover is only part of the decision: entity exclusions, transaction type and document type matter too. This guide covers the India rules reflected in the cited sources, checked 13 November 2026; confirm the latest notifications and portal guidance for your facts.
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| Name | Best for | Key spec | Checked |
|---|---|---|---|
| Regular GST invoice | Taxable supplies where the supplier is not required to report the document to an IRP, or where the relevant document or transaction is outside e-invoice scope | Supplier issues the applicable GST document under section 31 and the invoice rules; no IRN is required solely because the business is GST-registered | November 2026 |
| GST e-invoice | In-scope documents issued by a notified person that is not exempt | Supplier prepares the invoice, reports its prescribed data to an authorized IRP and obtains a signed document with a valid IRN and QR code | November 2026 |
These are not mutually exclusive invoice formats. An e-invoice remains the supplier’s GST invoice; IRP reporting and validation are additional steps for applicable documents.
What is the difference between an e-invoice and a regular GST invoice?
A regular GST invoice is the underlying tax document for a taxable supply. E-invoicing adds a required reporting and validation step for certain suppliers and documents; it does not replace the supplier’s accounting, billing or ERP system with a government invoice generator.
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The supplier prepares the document in its own system and reports the required particulars to an authorized IRP. The portal validates the data and returns a signed invoice containing a unique IRN and QR code. The supplier then issues that document to the buyer. GSTN describes e-invoicing as reporting invoice details to a portal, not generation of the invoice by a government portal, and says that for an applicable B2B transaction an invoice is valid only with a valid IRN. See GSTN’s e-invoice overview.
So the practical distinction is not simply “paper versus electronic.” A regular GST invoice can be prepared digitally, but that alone does not make it an IRP-reported e-invoice. Conversely, a required e-invoice is still the supplier’s invoice, now validated and identified through the IRP process.
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Four differences that matter in practice
| Question | Regular GST invoice | E-invoice process |
|---|---|---|
| Who is covered? | A registered supplier issuing the GST document required for its supply, subject to applicable rules | A notified person that meets the applicable turnover test, is not exempt and issues an in-scope document |
| What action is added? | Create and issue the applicable invoice under the GST invoice rules | Prepare the invoice in the business system, report its data to an authorized IRP, and obtain the signed IRN-bearing document |
| Which transactions? | Depends on the tax treatment and document required for the supply | Specified categories such as B2B, SEZ, export and deemed-export supplies, and covered invoices, credit notes or debit notes |
| What identifier? | The invoice has its own financial-year-unique serial number | The IRP additionally returns a unique IRN and QR code |
The supplier’s invoice number and the IRN serve different purposes. The invoice number is one of the prescribed particulars on the business’s document; the IRN is returned through the IRP process. Getting a number from an accounting system, printing a QR code, or emailing a PDF does not by itself amount to IRP reporting.
Who has to generate a GST e-invoice?
Start with the notified turnover threshold, then check whether the supplier, transaction and document are covered and whether an exemption applies. Crossing the threshold does not, by itself, establish that every invoice the business issues must be reported.
Notification No. 10/2023–Central Tax substituted “five crore rupees” for “ten crore rupees,” effective 1 August 2023. GSTN describes the threshold test as PAN-based and says it takes account of aggregate turnover in any preceding financial year from 2017–18 onward. In practical terms, assess turnover across the relevant PAN-based business, not just one GST registration or one current-year total. The 2023 amendment notification and GSTN’s overview support those points.
The turnover threshold is not the whole test. Relevant notifications exempt specified persons or entities, and e-invoicing applies to specified transaction and document categories. The cited material does not provide a complete exemption list; do not assume that a remembered category or a portal setting settles your case. Check the current notification and its conditions for the entity and transaction in question.
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GSTN also cautions that being enabled on the e-invoice portal does not itself mean a taxpayer is legally required to e-invoice. Portal access is an operational status, not a substitute for checking the legal applicability rules.
Apply the threshold carefully
The rule is not best treated as a simple “this year’s sales are above or below ₹5 crore” check. The guidance describes a PAN-based test that looks at aggregate turnover in any preceding financial year beginning with 2017–18. A business that is under the threshold in the current year may still need to assess its earlier turnover history. Likewise, looking only at one GST registration could give an incomplete picture where the relevant PAN has multiple registrations.
Keep the threshold test and the scope test separate in your records. First establish whether the supplier is within the notified class under the current rules. Then assess whether the particular transaction and document are covered, and whether an exemption applies. This avoids two opposite errors: assuming a business below the threshold must report every invoice because its portal account is enabled, or assuming a business above it must submit every document without checking scope and exclusions.
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Which transactions and documents are covered?
GSTN’s overview identifies specified B2B supplies, supplies to SEZs, exports and deemed exports, as well as related GST invoices, credit notes and debit notes. The exact requirement depends on the transaction and applicable notification, so do not treat “the business crossed ₹5 crore” as a direction to report every document of every kind.
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For an exempt supply or a supplier under the composition scheme, section 31 distinguishes a bill of supply from a tax invoice. Confirm the applicable document and rules for the specific supply; a bill of supply should not be casually treated as a tax invoice that must be submitted as an e-invoice.
Do not mistake business-wide status for document-by-document scope
A supplier can have a business-level e-invoice obligation and still need to distinguish among its documents. For example, a business dealing with other businesses, SEZ customers and retail consumers should classify the supply and document type rather than assume that one rule applies identically to all three. GSTN’s listed categories include B2B, SEZ, export and deemed-export supplies; that list should not be stretched into a claim that every consumer sale is covered.
Credit notes and debit notes also matter. E-invoicing is not limited to the original sale invoice: GSTN’s guidance includes related GST credit notes and debit notes within the specified document categories. When issuing an adjustment document, check its relationship to the transaction and the applicable notification instead of assuming that only the original invoice can require IRP reporting.
These distinctions are useful for accounting teams that handle mixed sales. A practical control is to classify each transaction type in the billing workflow and make the e-invoice decision before the document is issued. The classification should reflect both the legal scope and any exemption that applies to the specific supplier or transaction.
When can a business issue a regular invoice?
A business can issue the applicable GST document without IRP reporting when it is not within the notified e-invoice class for that document, or when a relevant exemption or scope rule means the transaction is not subject to reporting. It still must issue the document required by the GST law for the supply.
Section 31 of the CGST Act provides for tax invoices for taxable supplies and distinguishes cases such as exempt supplies and composition-scheme suppliers, for which a bill of supply is relevant. A regular invoice is not a workaround for an e-invoice obligation: if the supplier and document are covered, the supplier must complete the IRP step and issue the document as required. Review CGST Act section 31 alongside the CBIC invoice rules.
“Regular” also does not mean informal or missing required fields. The underlying GST document must meet the invoice rules whether or not IRP reporting applies.
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For a taxable supply, the question is not whether a business can choose whichever format is easier. It must issue the legally applicable invoice, and a notified supplier must add the IRP reporting step for in-scope documents. Conversely, a business outside that requirement still needs a compliant invoice; it should not describe a document as an e-invoice or assume it has an IRN merely because it was generated electronically.
What must a regular GST tax invoice contain?
CBIC’s invoice rules list the core particulars, with additional requirements depending on the case. A short checklist is useful for orientation, but it does not replace the full rule text or later notifications.
- Supplier name, address and GSTIN.
- A consecutive invoice number unique for the financial year, and the issue date.
- Recipient name and address, and GSTIN or UIN where applicable.
- HSN code or accounting code for services, and a description of the goods or services.
- For goods, quantity and unit or unique quantity code where applicable.
- Total value and taxable value, plus the applicable tax rate and tax amount.
- For an inter-state supply, the place of supply; include the delivery address if it differs from the place of supply.
- Whether tax is payable on a reverse-charge basis.
- The supplier’s signature or digital signature, subject to the applicable rule.
Exports have specific endorsement requirements, and other cases can have additional provisions. Use the current CBIC invoice rules for the complete particulars relevant to your supply.
These particulars are the foundation of the document whether it is printed on paper, sent as a PDF, or produced by business software. A digital invoice that omits required details is not made compliant just by being digital. Similarly, a complete tax invoice does not automatically satisfy e-invoice reporting when the supplier and document are within the notified IRP requirement. The invoice particulars and the portal-validation step are related but distinct compliance checks.
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For businesses handling both goods and services, note the different kinds of information that can apply: quantity and unit for goods, an accounting code for services, and place-of-supply details for an inter-state supply. Recipient GSTIN or UIN details apply where relevant. Because the full rules contain case-dependent provisions, use the CBIC text rather than relying on a generic template as the final authority.
Do not confuse the time allowed to issue the underlying tax invoice with the time allowed to report an e-invoice to the IRP. CBIC’s rules state a general 30-day period for issuing a tax invoice for taxable services, with a 45-day period for insurers, banks and financial institutions, including NBFCs, plus specified distinct-person and sectoral arrangements. Those are invoice-issuance provisions, not a general statement of the IRP reporting deadline.
How does the e-invoice process work?
The supplier remains responsible for preparing and issuing its invoice. For an applicable document, the additional workflow is:
- Prepare the invoice in your business system. Use the prescribed data format and check the transaction and recipient details before submitting.
- Report the required particulars to an authorized IRP. This is the portal reporting step; the IRP is not the supplier’s accounting system.
- Receive the validated document. The IRP returns a signed invoice with a unique IRN and QR code.
- Issue the returned document to the buyer. For an applicable B2B transaction, GSTN says the invoice is valid only with a valid IRN.
- Reconcile the tax reporting. GSTN says the invoice data is shared onward for auto-population in GSTR-1. Auto-population does not remove the need for the supplier to review its returns and records.
GSTN’s 2023 pamphlet says IRN generation through the authorized portals is free and describes verification through the e-invoice verifier app or the portal’s Search IRN feature. The pamphlet’s count of authorized portals is time-specific and should not be treated as a current count. Check current GSTN portal information for available IRPs and verification options.
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The IRP step gives the applicable document an identifier and signed QR-coded form; it does not transfer responsibility for the sale or the invoice away from the supplier. The supplier still prepares the data, issues the returned document to the buyer, and maintains its tax records. An IRP response should therefore be part of the business’s invoice trail, not a replacement for the accounting record.
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GSTN says invoice data is shared onward for auto-population in GSTR-1. That can reduce duplicate data entry, but businesses should still reconcile what appears in their return against their own sales records. The guidance describes auto-population, not a guarantee that every return is complete or correct without supplier review.
IRN generation through authorized portals is described as free in GSTN’s pamphlet. That means the legal reporting step does not itself require a paid software purchase. A business may choose accounting, billing or ERP software to prepare data or integrate its workflow, but the cited guidance does not establish paid software as mandatory. Check current software capabilities and IRP arrangements before relying on a particular product.
What reporting deadline applies?
There can be a separate IRP reporting window in addition to the legal timing for issuing the invoice. NACIN’s August 2025 GST Handbook states that, from 1 April 2025, a 30-day reporting window applies to businesses with annual aggregate turnover of ₹10 crore or more. It points to a GST portal advisory dated 5 November 2024.
That ₹10 crore figure concerns the handbook’s described reporting-window rule; it is not the e-invoice applicability threshold. The cited amendment established a ₹5 crore notified turnover threshold, while the handbook describes a 30-day reporting limit for a subset of businesses at ₹10 crore or more. Do not conflate the two figures.
Because the handbook is secondary to the portal advisory and does not settle every cutoff or edge case, verify the current primary GST portal advisory before relying on a precise deadline for a particular invoice. Keep the issuance deadline under the invoice rules and the IRP reporting deadline as distinct compliance checks.
The practical implication is that there may be two clocks to manage: when the underlying tax invoice must be issued under the invoice rules, and when the applicable invoice data must be reported to an IRP. The service-invoice periods described by CBIC do not replace the separate reporting-window rule. A business should not use one deadline as a proxy for the other, especially where its turnover puts it within the handbook’s described reporting-window category.
For operational planning, identify which documents are subject to the reporting window and how your team will monitor the relevant date. The cited handbook says the 30-day window applies from 1 April 2025 to businesses with annual aggregate turnover of ₹10 crore or more, but the exact cutoff and edge cases should be checked against the current GST portal advisory. Avoid applying a general deadline to every taxpayer or transaction without verifying the rule that governs it.
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- Calling every digital invoice an e-invoice. A PDF or system-generated invoice is not necessarily IRP-reported. The IRN and QR-coded signed document result from reporting applicable details to an authorized IRP.
- Assuming the portal creates the supplier’s invoice. The supplier creates the document in its own accounting, billing or ERP system; the portal validates and returns it with the IRN and QR code.
- Treating ₹5 crore as the only test. The threshold is assessed on a PAN basis against aggregate turnover in any preceding financial year since 2017–18, and exemptions and scope still matter.
- Using portal enablement as a legal conclusion. GSTN says portal enablement by itself does not mean the business is legally obligated to e-invoice.
- Assuming every B2C sale must be reported. The cited overview identifies specified categories and does not support a blanket claim covering every retail invoice.
- Confusing the ₹10 crore and ₹5 crore figures. The amendment establishes the cited applicability threshold; the ₹10 crore amount in NACIN’s handbook relates to a described 30-day reporting window.
- Using the invoice issue period as the IRP deadline. CBIC’s periods for issuing certain tax invoices and the separate IRP reporting window are different compliance questions.
- Assuming e-invoicing replaces all other invoice requirements. The tax document still needs applicable particulars, and the supplier remains responsible for issuing and reconciling its records.
How should a business decide what to issue?
Use this sequence for each relevant class of transaction, and retain the reasoning in your compliance process:
- Identify the supplier and turnover history. Check aggregate turnover on the relevant PAN basis for any preceding financial year since 2017–18 against the currently notified threshold.
- Check for an applicable exemption. Find the current notification and confirm that the entity meets the conditions; do not infer exemption from portal status alone.
- Classify the transaction and document. Determine whether it is a covered B2B, SEZ, export, deemed-export or other specified transaction, and whether the document is an invoice, credit note or debit note within scope.
- Choose the legally applicable document. A taxable supply may call for a tax invoice; an exempt supply or composition-scheme case may call for a bill of supply. Confirm the section 31 and rule treatment.
- If required, report before issuing the applicable e-invoice. Prepare the data, submit it to an authorized IRP, receive the IRN and QR-coded signed document, and follow the applicable reporting deadline.
- Check both timelines and retain evidence. Track invoice issuance under the invoice rules separately from IRP reporting, and keep the returned document and its identifier with the business records.
Accounting, billing or ERP software can help prepare structured invoice data, but the cited sources do not make a paid software product a legal prerequisite. GSTN says IRN generation through authorized portals is free. The important requirement is to produce accurate data and complete the applicable reporting step, using a process that suits the business’s systems.
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For a small business issuing only regular GST invoices, a paper invoice book can be a recordkeeping option, but it is not an e-invoice solution and cannot create an IRN. A business that has an IRP reporting obligation needs a process that can prepare and submit the required data through an authorized portal. Whether that process uses an integrated software system or another supported route is an operational choice; the requirement is to complete the reporting where applicable, not to buy a specific product.
Finally, keep the decision trail understandable to the people who issue invoices. A billing team should know which transaction types are potentially in scope, how to identify the applicable document, when to check for an exemption, and which deadline to monitor. A clear internal rule helps prevent the common mistake of treating an entire mixed business as either “always e-invoice” or “never e-invoice” without assessing the particular documents.
Frequently Asked Questions
Does every GST-registered business need an IRN?
No. GST registration alone does not create an e-invoice obligation. Check the notified turnover test, supplier exclusions or exemptions, and whether the transaction and document are in scope. GSTN also cautions that portal enablement alone does not determine legal applicability.
Does the buyer need to create or report the e-invoice?
The supplier prepares and reports the applicable document to the IRP, then issues the returned invoice to the buyer. The buyer should receive the IRN-bearing document for an in-scope transaction; the supplier’s reporting duty is not transferred to the customer.
Is an invoice valid if the portal has enabled my GSTIN but the document has no IRN?
Portal enablement does not establish legal applicability, but it also does not replace IRP reporting when the law requires it. For an applicable B2B transaction, GSTN says the invoice is valid only with a valid IRN, so resolve applicability and reporting before treating a document as compliant.
Do I have to buy invoicing software to generate an IRN?
The cited GSTN guidance says IRN generation on authorized portals is free; it does not say paid software is legally required. Businesses may use their own accounting, billing or ERP system to prepare the invoice data, then use an authorized IRP reporting route.
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Does the ₹10 crore figure decide whether I must e-invoice?
No. In the cited material, ₹10 crore is associated with a 30-day reporting window described by NACIN for businesses from 1 April 2025, while the notified applicability threshold established by the amendment is more than ₹5 crore. Confirm the current portal advisory for the reporting-window details and the current notification for applicability.
The Bottom Line
Bottom line: Issue the GST document the transaction requires, and add IRP reporting when the supplier, transaction and document meet the current e-invoice rules and no exemption applies. The cited amendment set the threshold at more than ₹5 crore on the described PAN-based historical turnover test, but threshold, scope and exemptions must be checked together. Keep invoice-issuance timing separate from IRP reporting timing, and verify current CBIC/GSTN notifications and portal guidance before applying the rules to a specific case.
