Time limit of filling appeal in GST Time limit for filling Appeal to Appellate Authority in GST and GST Appellate Tribunal Assesee can file appeal within 3 months from the date of communication of order of adjudicating authority. Department can file appeal within 6 months from the date of communication of order of adjudicating authority For filling appeal to GST Appellate Tribunal Time limit for filling Appeal to High Court Assessee and department both can file appeal within 180 days from the date of communication of order of appellate tribunal Time limit for filling Appeal to Supreme Court The GST Act does not provide any time limit for filling the appeal to Supreme Court. However, the order XX-B incorporated in the Supreme Court Rules, 1996 specified the time limit of 60 days for filling appeal under the Cetntral Excise Act and the Customs Act. It is expected that the same time will be specified for filling appeal to Supreme Court under GST Act.