If you are referring to parents contributing to their own RRSP`s, I have a shocking answer for you: Osap calculates parents net income by deducting from gross income the CPP, UI and taxes paid. By contributing too RRSP, the parents reduce their tax payable. This results in higher income for OSAP purposes, and reduces your osap entitlement. It can also reduce the non-repayable grants associated with OSAP. Typically the claw-back could be 15-30% of the tax saving due to the RRSP contribution...