Recognized provident fund trust will file its return as an AOP u/s 139(1) and return form will be ITR-5.
Please refer clause (iv) of proviso to section 164(1) where it is mentioned that in a case where
the relevant income is receivable by the trustees on behalf of a provident fund, superannuation fund, gratuity fund, pension fund or any other fund created bona fide by a person carrying on a business or profession exclusively for the benefit of persons employed in such business or profession,
tax shall be charged on the relevant income or part of relevant income as if it were the total income of an association of persons.