As per Notification No. 78/2020 - Central Tax dated 15th October, 2020, it is mandatory for the taxpayers to report minimum 4 digit or 6 digit of HSN Code in table-12 of GSTR-I on the basis of their Aggregate Annual Turnover (AATO) in the preceding Financial Year. To facilitate the taxpayers, these changes are being implemented in a phase-wise manner on GST Portal. Part I & Part II of Phase 1 has already been implemented from 01st April 2022 & 01st August 2022 respectively and is currently live on GST Portal. From 01st November, 2022, Phase-2 would be implemented on GST Portal and the taxpayers with up to Rs 5 cr turnover would be required to report 4-digit HSN codes in their GSTR-1.