As part of the Tax Relief Act of 2010, Social Security tax rates will be lowered by two percent. The employee-portion of Social Security taxes will be reduced from 6.2% to a temporary rate of 4.2% for 2011 only.This 2% tax break also applies to self-employed individuals. Medicare taxes are unchanged, the employer-portion of Social Security remains 6.2%, and the Social Security wage base remains $106,800 for 2011.