The article (from FAQ) does not list Form 1116. It seems to include the tax withholding in Box 6
- Enter the total Canadian CPP and OAS payments you received during 2021 in Box 5
- If you already have something in Box 5 from a previously-entered SSA-1099, add your CPP/OAS benefits to the amount already there
- In the uncommon situation where taxes were withheld from your payments, enter the total withheld during 2021 in Box 6
