Get your taxes done using TurboTax

its not on my w2 its on my pay stub. what I'm asking for ie: I get paid $200 pay taxes on that.  Say 6 months later I get charged back $100 of that $200, isn't that paying too much taxes on that? paid $200 worth of taxes, but in up only getting paid $100... over a year this can amount to a good deal of money.