If you had "extra"money withheld form your paycheck it is already factored in on your W-2.
This would already be factored in to the W-2 as the taxes paid. The amount of your federal tax will be higher than if you had not paid the extra.
Re: If i paid extra each paycheck towards taxes where do i put that? Is it already factored in?
@xmasbaby0 said it correctly,"If you had "extra"money withheld form your paycheck it is already factored in on your W-2."