Finance/Compliance Consultant
77990 Points
Posted on 06 November 2026
Practical rules:
• The IRN can be generated after the invoice date. The invoice (document) date can be earlier than the IRN generation date. There is no rule that both must match.
• Limit: for AATO of Rs 10 crore and above (from 1 April 2025; earlier Rs 100 crore and above), the IRP rejects invoices older than 30 days from the invoice date. Below Rs 10 crore, there is no portal time limit currently.
• But the invoice must be issued (with IRN) before or at the time of removal of goods (Sec 31(1)). An invoice without IRN is not a valid invoice (Rule 48(5)). Goods should not move on an invoice without IRN, and the e-way bill should be generated from the IRN.
• So for 10 December goods dispatched on 10 December, generating the IRN on 26 December is a procedural default (penalty exposure under Sec 122). It is still better than not doing it, and within the same GSTR-1 period.
• Backdating an invoice that was never issued (to shift the tax period) is not permitted.