Question: how to calculate federal tax per paycheck?
Answer: FICA Taxes - Who Pays What? Withhold half of the total (7.65% = 6.2% for Social Security plus 1.45% for Medicare) from the employee's paycheck. For the employee above, with $1,500 in weekly pay, the calculation is $1,500 x 7.65% (. 0765) for a total of $114.75.