Because the government provides a guaranteed 5% return on all TFSA cash balances Because RRSP withdrawals are added to your income and can "claw back" (reduce) government benefits like the GIS, while TFSA withdrawals do not Because you are prohibited from withdrawing money from an RRSP until you reach age 65 Because TFSA contributions provide a larger tax refund for low-income earners than RRSP contributions