The way the OAS clawback is calculated is based on the net income you reported on your tax return for the previous calendar year. That said, if you know that your income for the current calendar year is going to be substantially less than the prior year, you can use a T1213(OAS) for...
OAS Clawbacks for 2020: 0ld age security (OAS) is a dollar figure that you get when you hit 65. It’s based on how many years you’ve been a resident of Canada regardless of whether you paid into it or not, unless you made too much money in which case the OAS will be clawed ...