text: The Social Security Amendments of 1983 required all Members of Congress to participate in Social Security beginning January 1, 1984.  As Social Security and CSRS benefits sometimes overlapped, Congress called for the development of a new federal employee retirement program to complement Social Security. This new plan was enacted as the Federal Employees' Retirement Act of 1986. This act created the Federal Employees Retirement System (FERS), under which new Members of Congress are currently covered.
  When the FERS program went into effect, all Members elected in 1984 or later were automatically enrolled in the new plan. More senior Members were free to remain under the CSRS or enroll in the new FERS plan.
  The FERS program takes into account the years served and the average pay for the top three years in terms of payment. For example, a member elected before 1984 and thus qualifying under the CSRS plan, who worked for 22 years and who had a top three-year average salary of $154,267 would be eligible for a pension payment of $84,847 per year.  A member elected after 1984 would have been enrolled under the FERS plan, and their pension payment under similar conditions ($154,267 top three-year average salary, but with only 20 years of service, rather than the 22 in the CSRS example) would be $52,451.