If your GST e-invoice IRN is not generating, use the exact IRP error message to find the rejected field or request condition, correct that issue, and validate again. Do not keep resubmitting an unchanged invoice: a “duplicate” response may mean the first submission already succeeded.
What happens when an IRP generates an IRN?
An Invoice Registration Portal (IRP) checks key invoice fields. When reporting succeeds, it generates a unique 64-character Invoice Reference Number (IRN), digitally signs the invoice data, and returns it with a QR code. The IRIS IRP FAQ describes this process as: “On reporting, IRP will generate a unique ‘Invoice Reference Number (IRN)’, digitally sign it and return the e-invoice with QR code.” IRIS IRP FAQ
Start with the precise error code and message shown by the IRP. Error codes and master data can change, so use the current guidance and masters for the IRP that received your request.
Fix the error that matches your IRP response
“Duplicate IRN request” or error code 2150
Code 2150 indicates that the document already has an IRN. This can happen when a registration request succeeded but the response was lost or not saved, or when two requests for the same document were sent at nearly the same time. IRIS IRP error-code guidance IRIS IRP validation guidance
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- Check whether the document already has an IRN using the applicable lookup process on the same IRP.
- If you submit through software or an API, prevent simultaneous duplicate requests and save the IRN as soon as a successful response arrives.
- If the first request may have succeeded but its response is unavailable, retrieve the existing IRN details rather than registering the document again.
Invalid or inactive supplier or recipient GSTIN
Check that each GSTIN is entered correctly and was active for the relevant invoice date. 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 taxpayer data. If the GSTIN is invalid or cancelled on the common portal, confirm the counterparty’s registration details before trying again. IRIS IRP GSTIN validation guidance
Also check the request context: the request must be made under the supplier GSTIN or, where applicable, the e-commerce operator GSTIN. A mismatch between the authenticated or request-header GSTIN and the party identified in the invoice payload can cause rejection. IRIS IRP request validation guidance
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Future date or late-reporting rejection
The IRP rejects a future document date. Correct the date only if it was entered incorrectly; do not change a valid date simply to bypass validation. IRIS IRP validation guidance
Separately, an IRIS IRP notice says that, effective 1 April 2025, taxpayers with annual aggregate turnover (AATO) of ₹10 crore or more must report invoices, credit notes, and debit notes within 30 days of the document date. The notice says late reporting is restricted. Confirm that the taxpayer and document fall within this rule and check the current portal notice; changing unrelated invoice fields will not resolve an expired reporting window. IRIS IRP notice
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Invalid HSN, state, UQC, tax rate, or other master value
Compare the rejected value with the current master data on the IRP you are using. Check that the HSN is valid and appropriate for goods or services, and verify the state or place of supply, unit quantity code (UQC), tax rate, PIN-to-state mapping, country, port, and currency values. A PIN/state mismatch or stale GSTIN data in an IRP can trigger a rejection even when the commercial details look reasonable. IRIS IRP validation guidance
Tax treatment or line-item arithmetic error
Recalculate the affected line and invoice totals against the transaction’s actual classification. For an intra-state supply, check whether CGST and SGST apply rather than IGST, as appropriate. Do not alter tax treatment merely to make validation pass.
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- Confirm that CGST and SGST amounts are consistent with each other where applicable.
- Recheck tax amounts against taxable value and rate.
- Recalculate the assessable amount after discounts and verify each line total and the invoice total.
- Check that quantity is present and line serial numbers are not duplicated.
- Review the IRP’s stated tolerance: its table allows a ±1 difference for certain line-amount checks.
Use the specific error message to identify which amount or field failed; the applicable calculation depends on the transaction. IRIS IRP validation guidance IRIS IRP error-code guidance
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Whether you report one invoice or upload a batch, the underlying IRP validation rules do not change. A portal or Excel workflow may expose field errors before submission; an ERP or API workflow should validate required fields, lengths, and master values before sending the request.
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- Review the exact error code and identify the field or request condition named by the IRP.
- Correct that value in the source invoice or request, then validate it again.
- For the IRIS IRP workflow, resolve validation errors before selecting “Generate IRN.” For a bulk workflow, generate the JSON only after the records validate, then upload it.
- After submission, review processing status and the response fields for acknowledgment, IRN, signed invoice, and signed QR code.
- If the outcome is unclear, check for an existing IRN before resubmitting.
The IRIS IRP guide describes validation, JSON generation, bulk upload, and post-submission response review. IRIS IRP workflow guide
What to do after an IRN has been generated
If the generated invoice contains an error
The IRIS IRP FAQ says an e-invoice cannot be amended in place on the portal. It describes cancellation within 24 hours, subject to e-way bill status and sequence, and points to a credit-note and GSTR-1 correction route after that window in relevant cases. It also says a cancelled invoice’s IRN remains traceable and cannot be reused. Check the current official rules for the specific transaction and date before acting. IRIS IRP FAQ
If the e-invoice is missing from GSTR-1
Successful IRP data is normally auto-populated into the supplier’s GSTR-1. If it does not appear, the IRIS IRP FAQ says to enter the information manually and report the discrepancy through the GST-system feedback route described there. If details are edited or uploaded again in GSTR-1, the source or IRN presentation may differ. IRIS IRP FAQ
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