The two requirements which will make the filing of the return mandatory for the said trusts, etc., are :
1. the total income of the trust/institution should exceed the maximum amount which is not chargeable to income-tax (now i.e., in A.Y. 2001-02 the minimum amount is Rs.50,000/-)
2. such income is to be calculated without giving effect to the claim of deduction u/s.11 and u/s.12.
It is very clear that all trusts/ institutions with income/receipts exceeding Rs.50,000/- and claiming exemption u/s.11 and u/s.12 will have to file their return of income in Form 3A as specified in S. 139(4A) of the Income-tax Act, 1961. In other words if those trusts/institutions have income/receipts for the year of less than Rs.50,000/- no return of income needs to be filed.