Hey there. As far as I know, most people who retire do have taxes deducted from their CPP. Still, it's always a good idea to double check with a retirement calculator to see what the best option for your dad would be. The amount of taxes deducted depends on how much income your dad receives and what tax bracket he falls into. If you stop the deduction of taxes, it could potentially result in a larger refund or a smaller monthly income, so it's worth looking into. Good luck, and keep us updated.