if you buy and sell stocks shouldn't you understand the amount your making? if your gain was %20 but %15 goes to taxes...
The only thing I know is that I don't loss by earning money in stocks (sounds strange, huh?),
My accountant told me some people could earn a few thousand bucks but they don't know that they're losing out on some tax credits which is grater then what they earned, but by me that's not the case so I shouldn't worry about it, that's all I know...