Filing of FINAL RETURN in Form GSTR 10 is Mandatory for persons whose Registration has been cancelled, within 3 months from the cancellation date or Date of Order of Cancellation, whichever is later...
As per Notification No. 58/2018, CT, dated 26.10.2018; "Persons whose Registration has been cancelled on or before 30.09.2018 , is required to file Final Return ( Section 45 of CGST Act 2017 ) in FORM GSTR 10 within 31st December 2018".