16 August 2025
As per Notification No. 78/2020 – Central Tax, businesses with an AATO up to ₹5 crore must report 4-digit HSN codes for B2B transactions in GSTR-1. For AATO exceeding ₹5 crore, 6-digit HSN codes are mandatory for all outward supplies. B2C HSN reporting is optional for businesses with AATO up to ₹5 crore.