When you enter your amounts from your W-2 form for Medicare wages, sometimes employers over withhold Medicare taxes. Turbo Tax automatically figure the amount over withheld and credits it back to you on line 25c. Multiply your Medicare taxes withheld on your W-2 by .0145 (the correct percentage to withhold). If you see that your amount withheld is more than that, that should be the amount on line 25c.
