"Transitional retirement coverage" or CSRS Interim is a version of CSRS established pending creation of a new retirement system for employees first hired after December 31, 1983, and certain rehires. Employees covered by CSRS Interim provisions paid OASDI taxes and a reduced CSRS contribution. When FERS became effective on January 1, 1987, employees with CSRS Interim coverage acquired either FERS or CSRS Offset coverage.
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