CPP, OAS, and QPP are subject to a special tax treaty with the US. US residents receiving these pensions are taxed by the US as if the US paid them. TurboTax doesn't have a specific box labelled CPP, OAS or QPP. When using TurboTax to calculate how much to pay the US, in Step by Step view, under "Retirement Plans and Social Security" select the update or start button to the right of "Social Security (SSA-1099, RRB-1099) and enter the total amount you receive from CPP, QPP, OAS, and whatever you receive as stated on box 5 in your SSA-1099 into the "Box 5 Net Benefits for 2022" box TurboTax presents to you.
Don't enter CPP, OAS, or QPP data into the Canadian Registered Pension Income section. RRSPs are private plans. The US taxes Canadian and Quebec government paid pensions as if they are paid by the US. These pensions are not Canadian Registered Pension Income. Reference: IRA Publication 915, page 6.
