18 January 2026
Dear sir/s, for sale bill of October-2025 IRN was not generated by oversight within time limit, but where as e waybill was generated at that time, goods delivered to buyer, while we are going to enter the sale details in B2B of December-2025 it is not accepting the date '06-Oct-2025' can we generate credit note manually and re generate e-waybill and e invoice for said transaction or how to comply this issue, buyer also not get the ITC,
19 January 2026
Since IRN was not generated for October 2025 invoice, the invoice is invalid for GST ITC. The only legally safe method is to issue a credit note for the old invoice and issue a fresh invoice with current date and IRN. Buyer can then claim ITC on the new invoice. Backdated IRN generation is not permitted.