Extension of Return Filing Deadline: Input Service Distributor FORM GSTR-6 returns extended to end of March for specified months. The Commissioner extends the deadline for furnishing returns by Input Service Distributors in FORM GSTR-6 for the months July 2017 to February 2018 until the 31st day of March 2018, exercising powers under the GST Act and applicable state rules and superseding the earlier notification except as to prior acts or omissions.