{"id":40215,"date":"2026-10-21T17:04:14","date_gmt":"2026-10-21T11:34:14","guid":{"rendered":"https:\/\/mybillbook.in\/s\/?page_id=40215"},"modified":"2026-10-27T18:31:41","modified_gmt":"2026-10-27T13:01:41","slug":"invoice-reference-number-irn","status":"publish","type":"page","link":"https:\/\/mybillbook.in\/s\/gst-e-invoice\/invoice-reference-number-irn\/","title":{"rendered":"Invoice Reference Number (IRN) in GST"},"content":{"rendered":"

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<\/span>Invoice Reference Number (IRN) in GST<\/span><\/h1>\n

Understand the IRN full form, how an Invoice Reference Number is generated, where to find it on an e-invoice and how to verify the registered document.<\/p>\n

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<\/span>What Is an Invoice Reference Number (IRN)?<\/span><\/h2>\n

An Invoice Reference Number (IRN)<\/strong> is a unique 64-character identifier generated by an authorised Invoice Registration Portal (IRP) when an eligible tax invoice, credit note or debit note is successfully registered under India’s GST e-invoicing system.<\/p>\n

IRN stands for Invoice Reference Number. It identifies a registered e-invoice document and helps prevent duplicate registration. The IRN is different from the supplier’s own invoice number. Learn more about the GST e-invoicing system<\/a>.<\/p>\n

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<\/span>What Is the Full Form of IRN in GST?<\/span><\/h2>\n

IRN full form: Invoice Reference Number.<\/strong> In GST, it refers to the 64-character hexadecimal hash associated with a document registered through an IRP. It is issued as part of the successful e-invoice registration response.<\/p>\n

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<\/span>How Is an IRN Number Generated?<\/span><\/h2>\n

The IRP generates an IRN using the SHA-256 hashing algorithm and identifying document information. Once the submitted e-invoice data passes validation, the IRP returns the IRN, an acknowledgement and a digitally signed QR code.<\/p>\n

Businesses do not normally calculate the IRN manually. They submit the required invoice data through an authorised IRP, a supported offline utility or compatible software integration.<\/p>\n

[\/vc_column_text][vc_empty_space][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n

<\/span>What Parameters Are Used to Generate an IRN?<\/span><\/h2>\n

The unique document identification is based on four elements:<\/p>\n

    \n
  1. Supplier GSTIN:<\/strong> GST registration number of the supplier.<\/li>\n
  2. Financial year:<\/strong> Financial year relating to the document date.<\/li>\n
  3. Document type:<\/strong> Tax invoice, debit note or credit note.<\/li>\n
  4. Document number:<\/strong> The number assigned by the supplier.<\/li>\n<\/ol>\n

    Using these elements, the system prevents a second IRN from being registered for the same document identity.<\/p>\n

    [\/vc_column_text][vc_empty_space][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n

    <\/span>IRN Number Example in GST<\/span><\/h2>\n

    Consider this illustrative<\/strong> invoice record:<\/p>\n\n\n\n\n\n\n\n\n
    Parameter<\/th>\nExample<\/th>\n<\/tr>\n<\/thead>\n
    Supplier GSTIN<\/td>\nSample GSTIN (illustration only)<\/td>\n<\/tr>\n
    Financial year<\/td>\n2026\u201327<\/td>\n<\/tr>\n
    Document type<\/td>\nTax invoice<\/td>\n<\/tr>\n
    Document number<\/td>\nINV-105<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    When a valid document containing the complete required details is accepted by an IRP, the portal returns its actual IRN. The example above does not<\/strong> represent a registered invoice or a real portal-issued IRN.<\/p>\n

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    <\/span>Where to Find the IRN Number on an Invoice<\/span><\/h2>\n

    After successful registration, find the IRN in the response from the IRP or in your billing software’s registered e-invoice details. Some invoice layouts display the value in a field labelled IRN<\/strong> or Invoice Reference Number<\/strong>.<\/p>\n

      \n
    1. Open the successfully registered e-invoice or the related IRP acknowledgement.<\/li>\n
    2. Look for the IRN field and the acknowledgement details.<\/li>\n
    3. Check the signed QR code included on the e-invoice; it carries information including the IRN.<\/li>\n<\/ol>\n

      Editorial image placement:<\/em> Insert a redacted, verified sample e-invoice here with the IRN field and signed QR code labelled. Do not substitute a fabricated valid-looking QR code.<\/p>\n

      [\/vc_column_text][vc_empty_space][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n

      <\/span>Difference Between Invoice Number and IRN Number<\/span><\/h2>\n

      An invoice number is assigned by the supplier. The IRN is returned by the Invoice Registration Portal after registration.<\/p>\n\n\n\n\n\n\n\n\n
      Basis<\/th>\nInvoice number<\/th>\nIRN<\/th>\n<\/tr>\n<\/thead>\n
      Issued by<\/td>\nSupplier or billing software<\/td>\nAuthorised IRP<\/td>\n<\/tr>\n
      Purpose<\/td>\nIdentifies the invoice in business records<\/td>\nIdentifies the registered e-invoice document<\/td>\n<\/tr>\n
      Format<\/td>\nSupplier-defined, within GST invoicing rules<\/td>\n64-character hexadecimal hash<\/td>\n<\/tr>\n
      When created<\/td>\nDuring invoicing<\/td>\nAfter successful IRP validation and registration<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      [\/vc_column_text][vc_empty_space][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n

      <\/span>When Is the Invoice Reference Number (IRN) Generated?<\/span><\/h2>\n

      An IRN is generated when an eligible document is successfully reported to an authorised IRP. The GST e-invoicing mandate generally covers taxpayers whose aggregate annual turnover has exceeded \u20b95 crore<\/strong> in any financial year from FY 2017\u201318, subject to exclusions and the applicable rules. See the separate e-invoice limit and applicability guide<\/a> for detailed eligibility.<\/p>\n

      Important IRN Reporting Time Limit<\/h3>\n

      From 1 April 2025<\/strong>, taxpayers with aggregate annual turnover of \u20b910 crore or more<\/strong> are subject to a 30-day reporting restriction for eligible invoices, credit notes and debit notes on the IRP. This time-limit threshold is separate from the \u20b95 crore e-invoicing applicability threshold. Check the latest official advisory before relying on time-sensitive compliance guidance.<\/p>\n

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      <\/span>How to Generate an IRN Number for an E-Invoice<\/span><\/h2>\n

      For an eligible document, the usual registration process is:<\/p>\n

        \n
      1. Prepare an invoice, debit note or credit note containing the required GST fields.<\/li>\n
      2. Submit the document details through an authorised IRP or integrated e-invoicing software<\/a>.<\/li>\n
      3. Correct any validation errors returned by the portal.<\/li>\n
      4. On successful registration, receive the 64-character IRN, acknowledgement and signed QR code.<\/li>\n
      5. Store the registered document details and include the signed QR code on the invoice as applicable.<\/li>\n<\/ol>\n

        For a full procedure, see e-invoice registration and generation<\/a>. For batch processing, see bulk IRN generation<\/a>.[\/vc_column_text][vc_empty_space][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n

        <\/span>How to Check or Verify an IRN Number in GST<\/span><\/h2>\n

        You can check registered e-invoice information by verifying the digitally signed QR code<\/strong> using the official e-invoice verification app or an authorised portal verification facility.<\/p>\n

          \n
        1. Open an official, supported QR-code verification tool.<\/li>\n
        2. Scan the signed QR code on the registered e-invoice.<\/li>\n
        3. Review the verified information, such as supplier GSTIN, document number, document date and IRN.<\/li>\n
        4. Compare those details with the invoice you received.<\/li>\n<\/ol>\n

          If details do not match, ask the supplier to confirm the registration and the invoice. A QR-code verification procedure should not be confused with registering a new IRN. See the e-invoice QR code scanner<\/a> guide.<\/p>\n

          [\/vc_column_text][vc_empty_space][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n

          <\/span>Common IRN Generation Errors and How to Avoid Them<\/span><\/h2>\n

          If IRN generation fails, examine the portal response before submitting again.<\/p>\n\n\n\n\n\n\n\n\n
          Issue<\/th>\nWhat to check<\/th>\n<\/tr>\n<\/thead>\n
          Duplicate document<\/td>\nCheck whether an IRN already exists for the supplier, financial year, document type and number.<\/td>\n<\/tr>\n
          Invalid GSTIN<\/td>\nVerify relevant GSTIN details and status.<\/td>\n<\/tr>\n
          Document data error<\/td>\nReview mandatory fields, dates, document type and tax values.<\/td>\n<\/tr>\n
          Reporting window exceeded<\/td>\nCheck document date against restrictions applicable to the taxpayer.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

          For specific portal messages, refer to common e-invoice errors and codes<\/a>.<\/p>\n

          [\/vc_column_text][vc_empty_space][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n

          <\/span>What Is the Difference Between an IRN and a QR Code?<\/span><\/h2>\n

          The IRN<\/strong> is the unique identifier of the registered e-invoice document. The digitally signed QR code<\/strong> contains key invoice details, including the IRN, and is used to verify those details and the authenticity of the signed information. They are related but are not interchangeable.<\/p>\n

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          \t\t

          \n\t\t\t\t\t\t\t

          <\/span>Frequently Asked Questions<\/span><\/h2>\n\t\t\t\t\t\t
          \n\t\t\t\t\t\t\t\t\t

          Does an IRN expire after 24 hours?<\/h3>\n\t\t\t\t\t
          \n\t\t\t\t\t\t

          No. The IRN does not automatically expire after 24 hours. The commonly cited 24-hour window concerns cancellation through the IRP, subject to applicable portal conditions.<\/p>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t

          Can an IRN be cancelled?<\/h3>\n\t\t\t\t\t
          \n\t\t\t\t\t\t

          An IRN can generally be cancelled on the IRP within 24 hours of reporting, subject to the rules and any linked e-way bill restrictions. After that period, use the applicable GST return or correction process rather than attempting a late IRP cancellation. See how to cancel an e-invoice.<\/p>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t

          Can the same invoice number be used to generate another IRN?<\/h3>\n\t\t\t\t\t
          \n\t\t\t\t\t\t

          Not for the same combination of supplier GSTIN, financial year, document type and document number. Cancelling an IRN does not make that document identity available for re-registration.<\/p>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t

          How is the financial year determined for IRN generation?<\/h3>\n\t\t\t\t\t
          \n\t\t\t\t\t\t

          It follows the date of the document. For example, a document dated 15 October 2026 belongs to financial year 2026\u201327.<\/p>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t

          Is an IRN required for every GST invoice?<\/h3>\n\t\t\t\t\t
          \n\t\t\t\t\t\t

          No. The requirement applies to relevant document types and transactions of taxpayers covered by the e-invoicing mandate, subject to exemptions.<\/p>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n

          [\/vc_column_text][vc_empty_space][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]Last reviewed:<\/strong> 21 October 2026<\/p>\n

          Official references:<\/strong> GST e-invoice portal<\/a>; GST Portal<\/a>; applicable CBIC notifications and IRP advisories. Check the official portals for subsequent changes.[\/vc_column_text][vc_empty_space][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n

          <\/span>Read More About GST e-Invoicing<\/span><\/h2>\n

          [\/vc_column_text][vc_empty_space][\/vc_column][\/vc_row][vc_row][vc_column width=”1\/3″][vc_column_text]GST e-invoice guide<\/a><\/p>\n

          E-invoice eligibility<\/a><\/p>\n

          Generate e-invoices<\/a>[\/vc_column_text][\/vc_column][vc_column width=”1\/3″][vc_column_text]E-invoice format<\/a><\/p>\n

          Bulk IRN generation<\/a><\/p>\n

          Cancel an e-invoice<\/a>[\/vc_column_text][\/vc_column][vc_column width=”1\/3″][vc_column_text]E-invoicing error codes<\/a><\/p>\n

          E-invoicing software<\/a><\/p>\n

          Common Errors in e-Invoicing<\/a>[\/vc_column_text][\/vc_column][\/vc_row]<\/p>\n","protected":false},"excerpt":{"rendered":"

          Draft replacement for the existing IRN GST guide, with corrected generation rules, IRN examples, verification steps, comparisons and FAQs.<\/p>\n","protected":false},"author":28,"featured_media":17938,"parent":17712,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"yoast_head":"\nIRN Full Form in GST | Invoice Reference Number<\/title>\n<meta name=\"description\" content=\"Understand IRNs, or invoice reference numbers. 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