Regular employees:
0.8% to FERS Retirement & Disability Trust Fund
1.45% to Medicare  
6.2% of first $106,800 of wages (in 2010) to Social Security

Special employee groups: (law enforcement, firefighters, air traffic controllers) 
1.30% to FERS Retirement & Disablity Trust Fund
1.45% to Medicare  
6.2% of first $106,800 of wages (in 2010) to Social Security