Employees covered by the Civil Service Retirement System (CSRS) Offset retirement plan are covered by and paying into both CSRS and Social Security, earning retirement credit under both. All CSRS rules apply to CSRS Offset, including the age and service requirements for retirement eligibility.

The difference is that when a CSRS Offset employee retires, his/her annuity is computed under the same rules that apply to other employees under full CSRS. However, when the retired CSRS Offset employee becomes eligible for Social Security (usually at age 62), the Office of Personnel Management will reduce, or