Code of Federal Regulations Title 5. Administrative Personnel § 5.841.503 Amounts of employee deductions

(a) Except as provided in paragraph (b) of this section, the rate of employee deductions from basic pay for FERS coverage is seven percent of basic pay minus the percent of tax which is (or would be) in effect for the payment, for the employee cost of social security.

(b) The rate of employee deductions from basic pay for FERS coverage for a Member, law enforcement officer, firefighter, nuclear materials courier, customs and border protection officer, air traffic controller, member of the Supreme Court Police, Congressional employee, or employee under section 302 of the Central Intelligence Agency Act of 1964 for Certain Employees is seven and one-half percent of basic pay, minus the percent of tax which is (or would be) in effect for the payment, for the employee cost of social security.

(c) Employee deductions will be at the rate in paragraph (a) or (b) of this section as if social security deductions were being made even if social security deductions have ceased because of the amount of earnings during the year, or are not made for any other reason.