08 October 2025
If detected within 24 hours of generation, cancel the original e-invoice on the IRP portal. Raise a new invoice at the correct rate with a new invoice number, and generate a fresh IRN. Remember, e-invoices cannot be edited or amended on the Invoice Reference Portal (IRP)—only canceled within 24 hours.
If the 24-hour window has passed, issue a Credit Note for the entire value of the wrong-rate invoice and a fresh correct invoice with the new tax rate. This ensures that the old entry is nullified, and compliance is maintained.
08 October 2025
Make sure to include both the credit note (for the canceled wrong-rate invoice) and the new invoice at the correct rate in GSTR-1 for the period in which you detected the error.
Review and confirm that all changes are accurately reflected before submission to avoid mismatch or future notices.