GST return non-filers with high turnover face monitored compliance action and mandatory portal reporting of steps taken. Direction to ensure timely filing of GST returns by traders having turnover above Rs. 5 crore who are identified as return non-filers through GSTN data, with departmental monitoring and upload of action taken on the portal. GSTN is to provide the list of non-filers by the 20th day of the month, assessing authorities must take necessary action under the rules against continued default, and the details of action taken are to be uploaded by the 30th day of every month. Zonal Additional Commissioners must personally monitor compliance on a division-wise, officer-wise and firm-wise basis.