Adjusting your withholding will ensure that you don't have too much (or too little) federal income tax withheld from your paycheck. Use Form W-4 to let your employer know how much you want them to withhold.
(Box 5 of your W-2s) by 1.45%. Subtract this amount from the total Medicare tax withheld (Box 6 of your W-2s). An amount greater than zero is your additional Medicare withholding amount. Include this amount in your total Federal tax withholdings for a more exact estimate of your taxes...
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