How Much Is Medicare Social Security Tax? 
The Medicare Social Security tax must be paid on all income . The rates for 2013 are as follows : Employees : 1.45 % Employers : 1.45 % Self-Employed : 2.9 % If an individual 's earned income is over $ 200,000 they must pay 0.9 % more in Medicare tax . Married couples filing jointly with an income over $ 250,000 must also pay an additional 0.9 % Medicare tax in addition to the percentages noted above . 