Special Category Retirement Deposits and Redeposits: FERS Service Credit Rules
Why Deposits and Redeposits Matter More for Special Category Employees
Every year of creditable service affects your FERS annuity calculation, but for special category employees the stakes are amplified by the 20-year covered-service threshold. Below 20 years, you lose the 1.7% enhanced multiplier entirely. Above it, every additional year still adds to your total annuity at the 1.0% rate. Understanding when a deposit or redeposit is required — and what happens if you don't make it — is the difference between a complete retirement package and a permanently reduced pension.
Deposits: Paying for Non-Deduction Service
A deposit covers periods of federal civilian service during which no retirement deductions were withheld from your pay. This most commonly happens with temporary appointments, intermittent service, or service performed before you were covered by FERS.
Pre-1989 non-deduction service: Civilian service performed before January 1, 1989, during which retirement deductions were not withheld, can be credited toward your FERS retirement by paying a deposit of 1.3% of the basic pay earned during that period, plus accrued interest. Interest is charged from the midpoint of the service period and compounds annually at the variable rate set for each year.
Post-1988 non-deduction service: Civilian service performed on or after January 1, 1989, during which no retirement deductions were withheld, cannot be purchased under FERS and does not count toward retirement eligibility or annuity calculations.
For ordinary non-deduction service, the date boundary applies: if you have a period of temporary service from 1987, you can buy it; if the same type of service happened in 1990, you cannot buy it under FERS.
Redeposits: Repaying Refunded Contributions
A redeposit covers periods of FERS-covered service for which you previously received a refund of retirement contributions. This happens when employees separate from federal service, receive a lump-sum refund of their FERS deductions, and then return to federal employment.
The consequences of an unpaid redeposit are specific and significant:
- Eligibility: The refunded service still counts toward retirement eligibility, including the 20-year covered-service threshold. You won't lose your eligibility for special category retirement because you haven't made the redeposit.
- Annuity calculation: The refunded service is excluded from the annuity computation until the redeposit is paid. Those years simply vanish from the formula, permanently reducing your monthly pension.
For a special category employee, the math can be stark. Five years of refunded covered service at the 1.7% rate represents 8.5 percentage points of your high-three salary — over $10,000 per year for someone with a $130,000 high-three average. The redeposit cost (the refunded amount plus interest) is almost certainly less than the lifetime value of the restored annuity credit.
The redeposit is submitted on Standard Form 3108 (Application to Make Service Credit Payment) through your employing agency. Interest accrues from the date of the refund and compounds annually.
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Military Service Deposits
Veterans who transition to federal civilian special category positions can credit their post-1956 active-duty military service by paying a deposit equal to 3% of their basic military pay during the active-duty period, plus interest. The deposit must be paid in full to the employing agency before final separation from federal service.
Two critical points for special category planning:
Military service doesn't count toward the 20-year minimum. A veteran with 6 years of military service and 18 years of covered LEO service has 18 years of covered service, not 24. The military time adds to total service for annuity calculation purposes (at the 1.0% rate), but it cannot substitute for the covered-service requirement.
Missing the deposit deadline is permanent. If you separate for retirement without completing the military service deposit, OPM excludes the military service from both eligibility and annuity calculations. If excluding that time drops you below the service thresholds, your retirement calculation changes fundamentally. The deposit timing must be resolved before final retirement separation.
Timing and Interest
Interest on deposits and redeposits is charged at variable rates set by the Department of the Treasury and applied by OPM. Waiting to make a deposit costs money — the interest compounds each year, increasing the total payment. An employee who identifies a deposit obligation at age 45 pays less than one who discovers it at 55.
Most agencies allow installment payments through payroll deduction, spreading the cost across multiple pay periods. Some employees with large deposit obligations take advantage of this by starting payments years before their planned retirement date, avoiding a single large lump-sum payment.
The Special Category Retirement Guide includes a deposit completion tracker worksheet that calculates the cost of outstanding deposits and redeposits at current interest rates and models the annuity impact of completing versus skipping each one.
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