Can one ask Revenue Canada for already deducted taxes from this year to be paid back in 2021 in my tax return?

Answer 1

Not in the Taxes > UNITED STATES category.

Answer 2

That is how it always works. The refund you get in any year is a return of taxes you overpaid in the previous year. But you will not know until 2021 if taxes deducted during 2020 were in excess of what you will owe for the year.

Answer 3

What does this have to do with USA taxes?