CSRS creditable service can include:
(for more specific

details, see the related articles listed below)

• generally the period of time from each date of appointment to date of

  separation (when deductions were paid into the retirement system)

• Leave without pay (LWOP) if it does not exceed six months within a calendar

  year

• Part-time service

• Intermittent service (time actually served, WAE

  [when-actually-employed]) - up to 260 days a year.

• workers compensation is creditable if the employee returns to duty

• breaks in service of up to 3 days

• Deposit service* (time employee worked for federal government but there were

  no dedeductions for CSRS retirement).  This is often "temporary" or

  "casual" work.

• Redeposit service* (employees pays the government back for retirement

  contributions that were previously withdrawn)

• Military service

• Unused sick leave