As per the CRA, the net amount of any spouse's allowance and guaranteed income supplement (federal supplements) that you received in the tax year is shown in box 21 of your T4A(OAS) slip. You must report this amount on line 4600 of your return.
You may have to repay OAS benefits (see line 23500) if the result of the following calculation is more than $90,997: Please check out this CRA article.
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