GSTGST Articles Due Date for GSTR-3B for July, 2018 to March, 2019 By CA affinity - August 11, 2018 0 683 The due date for filing GSTR-3B and payment of tax for the months July, 2018 to March, 2019 has been notified as 20th of the corresponding month. This is in pursuance to the Notification No. 34/2018 – CGST issued on 10th August 2018.