GST Update Upcoming Restriction on Manual Changes (Effective January 2025) From the January 2025 tax period, the GST Portal will restrict changes in auto-populated values in the pre-filled GSTR-3B from GSTR-1/1A/IFF or GSTR-2B, further enhancing accuracy in the return filing system. If any change is required in the auto-populated values, the same should be handled through GSTR-1A or IMS.