GSTR-1 filing deadline extended for April tax period to late next month under amended state notification. The time limit for furnishing details of outward supplies in FORM GSTR-1 for registered persons required to furnish return for the tax period April 2021 is extended until the twenty-sixth day of the month succeeding that tax period by amendment to Notification No. 83/2020-State Tax; the notification is deemed effective from 1st May 2021.