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If a GST e-invoice IRN is not generating, start with the exact error code or message returned by the Invoice Registration Portal (IRP), then correct the field or request condition it identifies. Do not keep resubmitting an unchanged invoice: a first request may already have registered successfully even if its response was lost.
What happens when an IRP generates an IRN?
The IRP validates key invoice details. After successful reporting, it generates a unique Invoice Reference Number (IRN), digitally signs the invoice data and returns it with a QR code. The IRN is a 64-character hash. The IRIS IRP FAQ describes the process this way: “On reporting, IRP will generate a unique ‘Invoice Reference Number (IRN)’, digitally sign it and return the e-invoice with QR code.”
When validation fails, use the portal’s error code and message to locate the problem rather than assuming the invoice needs to be entered again. Error codes and master data can change, so check the current guidance for the IRP you are using.
Fix the error shown by the IRP
Duplicate request or duplicate IRN
IRP error code 2150 indicates an attempt to register a document that already has an IRN. A duplicate-request response can also occur when two requests for the same document are sent at nearly the same time. The first request may have succeeded even if the system did not return a usable response.
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- Two-Part Carbonless Invoice Book: Each invoice book has 50 sets of invoices, each with a white/light yellow section, with the yellow section retained in the invoice book to maintain detailed records.
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- Wraparound Divider Flap: A thick folded cardboard divider is integrated into the back of each invoice book for use between each two-part sales order to prevent the written content from rubbing off on subsequent copies of the invoice, resulting in wasted invoices.
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- Check the applicable IRP lookup process for an existing IRN and retrieve the registered details before retrying.
- If the IRN exists, use that registration rather than submitting the document again.
- For API or ERP integrations, save the IRN as soon as a successful response arrives and prevent simultaneous submissions of the same document.
The IRIS IRP validation guidance explains the duplicate-document validation. Repeating the same registration request without checking for an existing IRN risks another rejection.
Invalid, inactive or mismatched GSTIN
Check that the supplier and recipient GSTINs are present, correctly entered and active for the relevant invoice date. The IRP validates GSTIN information against taxpayer data. If a GSTIN is valid and active on the GST common portal but one IRP rejects it, use that IRP’s “Update from GST Common Portal” function to refresh its data. If the GST common portal shows the GSTIN as cancelled or invalid, confirm the counterparty’s registration details.
Also check the request context: the GSTIN authenticated for the request must match the supplier GSTIN, or the e-commerce operator GSTIN where applicable, identified in the payload. A mismatch between the request header and invoice parties can cause rejection even when the GSTIN itself is valid.
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Future date or reporting window expired
An invoice with a future document date is rejected. Separately, an IRIS IRP notice says that from 1 April 2025, taxpayers with aggregate annual turnover (AATO) of ₹10 crore or more must report invoices, credit notes and debit notes within 30 days of the document date; reporting after that window is restricted. Check the current IRIS IRP notices and confirm that the taxpayer and document fall within the rule before diagnosing a late-reporting rejection.
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Invalid HSN or other master-data value
Check the HSN against the IRP’s current master data and make sure it corresponds to goods or services as applicable. Review other coded values too: place-of-supply and state, unit quantity code (UQC), tax rate, PIN-to-state mapping, country, port and currency. An invalid PIN/state combination or stale GSTIN data in an IRP can cause rejection even when the commercial details look reasonable.
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- CONSECUTIVELY NUMBERED: Large 6-digit numbers help you thumb through invoices quickly
- STOCK UP: Each book includes 50 white/canary sets; order several to keep your favorite forms on hand
Use the current masters for the specific IRP rather than relying on an old spreadsheet or a code accepted by a different portal. The IRIS IRP validation rules describe these checks.
Tax treatment or line-item arithmetic does not match
Recheck the transaction classification and the arithmetic on the affected line. For an intra-state supply, CGST and SGST generally apply where appropriate rather than IGST; confirm the supplier state and place of supply before selecting the tax treatment. Do not change tax merely to force the portal to accept the invoice.
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- Recalculate tax against the taxable value and applicable rate.
- Check the assessable amount after discounts and make sure line totals and invoice totals reconcile.
- Confirm that each line has a quantity and a unique serial number.
The IRP validation table allows a tolerance of ±1 for certain line-amount checks; that tolerance does not replace correct calculation or transaction classification. See the IRIS IRP validation table for the specific checks and current error codes.
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- In value packs with three 50-invoice books for your small business; buy ahead to keep on site or take on the road for pop-up shop sales
Check the submission workflow before trying again
Submission channels differ in how data is entered, but they do not change the underlying invoice validations. A portal or Excel workflow may surface errors before submission; an API or ERP request may return them in the response. In either case, correct the identified field and validate again.
- Check required fields, data formats and field lengths against the applicable IRP guidance.
- For the IRIS portal workflow, validate the invoice records and correct surfaced errors before selecting “Generate IRN.”
- For bulk processing, generate the required JSON only after the records validate, then upload it through the supported workflow.
- After submission, review the processing status and response columns for acknowledgment, IRN, signed invoice, signed QR code and status before deciding whether a retry is needed.
The IRIS IRP user guide describes its portal and bulk workflows. If an API or ERP request times out or returns an unclear result, check for an existing registration before sending another registration request.
What to do after an invoice has already been registered
An e-invoice cannot be amended in place on the portal, according to the IRIS IRP FAQ. The FAQ describes cancellation within 24 hours, subject to e-way bill status and sequence; after that window, it points to a credit-note and GSTR-1 correction route in relevant cases. It also says a cancelled invoice’s IRN remains traceable and cannot be reused for another invoice.
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These are portal FAQ descriptions, not individualized tax advice. Check the current official rules and the facts of the transaction—including e-way bill status—before cancelling or correcting a reported document.
If the e-invoice is missing from GSTR-1
Successful IRP reporting normally auto-populates the invoice data into the supplier’s GSTR-1. If it is missing, the IRIS IRP FAQ says to enter the details manually and send feedback through the official GST-system route described there. If details were edited or re-uploaded in GSTR-1, the source or IRN presentation may differ from the original IRP entry.
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