Definition
FICA is the Federal Insurance Contributions Act, which funds Social Security and Medicare. Both the employer and the employee pay: 6.2% each for Social Security, up to an annual wage base, and 1.45% each for Medicare, for a combined employer share of 7.65% on most wages. Higher earners pay an additional Medicare tax on the employee side. For W-2 temp workers, the staffing agency as employer of record pays the employer share, which is one of the costs built into the bill rate.
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This definition is general information, not legal, tax or financial advice. Rules vary by state and change over time.