I want to file the return of an AOP. Which form I need to fill? myITreturn Helpdesk Updated May 20, 2016 11:30 Follow You need to fill form no. ITR- 5. AOP, AOP return form Clarified the form number to be filled for AOP return filing. Have you filed your Income-tax return yet? Click here to start now. Related articles I want to file the return of an AOP. Which form I need to fill? How to submit return for more than 2 years old? Comments 0 comments Please sign in to leave a comment.