Your basic annuity is computed based on your length of service (which includes unused sick leave if you retire on an immediate annuity) and high average pay. To determine your length of service for computation, add all your periods of creditable service, and the period represented by your unused sick leave, then eliminate from the total any fractional part of a month. Your high average pay is the highest average basic pay you earned during any 3 consecutive years of service. Generally, your basic annuity cannot be more than 80 percent of your high average pay, unless the amount over 80 percent is due to crediting your unused sick leave.
Your yearly basic annuity is computed by adding: (a) 1 1/2 percent of your high average pay times service up to 5 years; (b) 1 3/4 percent of your high pay times years of service over 5 and up to 10; and (c) 2 percent of your high pay times years of service over 10.
Your basic annuity will be reduced if: (a) you retire before age 55 (unless you retire for disability or under the special provisions for law enforcement officers, air traffic controllers, and firefighters); (b) you didn’t make a deposit for service performed prior to October 1, 1982, during which no deductions were taken from your pay (non-deduction service after that date is not used in the computation of benefits if the deposit is not paid); (c) you didn’t make a redeposit of a refund for a period of service that ended before October 1, 1990; or (d) you provide for a survivor annuitant.
Your annuity will be increased periodically by cost-of-living increases that occur after you retire. Your initial cost-of-living increase will be prorated based on how long you have been retired when that cost-of-living increase is granted.