08 October 2013
1. Exemption under section 11 and 12 are not available in case the activities of the trust don't endure benefit to the public ie if the benefit accrues only to some particular people leaving out others high and dry!
Further, even a charitable trust loses exemption under 11 and 12 if it endures benefit only to a particular religious community or caste.
2. Therefore, you may use ITR 5. Form 10B won't apply. For taxability check Section 161 and 164.
AOP or trust, depends on how you are registered with income tax authorities. Check PAN