Seasonal Firefighter Service Credit: What Counts Toward FERS Retirement

Most wildland firefighters didn't start their federal careers in a permanent position. They came in as temporary seasonal employees — working fire seasons and going home in the fall. Those early years represent real work, real risk, and real time served. Whether they count toward FERS retirement depends entirely on when they occurred and whether retirement deductions were withheld.

The rules here are rigid. Getting them wrong means either overestimating your service computation date and planning to retire earlier than you're eligible, or leaving creditable time on the table by not completing a deposit you're entitled to make.

The January 1, 1989 Cutoff

FERS draws a hard line at January 1, 1989. Everything before that date plays by one set of rules; everything on or after plays by another.

Pre-1989 temporary service — where retirement deductions were not withheld — can be credited toward FERS retirement eligibility and annuity computation if you complete a service credit deposit. The deposit is 1.3% of the total basic pay you earned during the non-deduction period, plus interest calculated from the midpoint of the service at Treasury variable rates. You complete this by filing an SF 3108 through your agency HR office.

Post-1988 temporary service — where you served as a temporary employee without retirement deductions on or after January 1, 1989 — is not creditable under current FERS law. Period. Under 5 U.S.C. § 8411, there is no deposit mechanism that makes this service count toward retirement eligibility or annuity computation.

The Federal Retirement Fairness Act (H.R. 1522) would create a path to purchase credit for post-1988 temporary service, but it remains pending legislation. Do not plan your retirement around it passing.

Permanent Seasonal Positions

If you held a permanent seasonal appointment — like a 13/13 or 18/8 schedule — where FERS deductions were withheld from your pay, that time is fully creditable. You were a FERS-covered employee during the pay periods you worked, and that service counts.

The complexity with permanent seasonal positions is LWOP. During the months you're in non-pay status between seasons, you're on leave without pay. Under FERS rules, an aggregate of 6 months of nonpay status in any calendar year is creditable service; excess time is not creditable toward retirement.

For a firefighter on an 18/8 schedule (18 pay periods on, 8 off), the off-duty time typically stays within the 6-month limit. A 13/13 schedule is tighter — 13 pay periods off is roughly six months, so track actual LWOP against the six-month calendar-year limit.

The Buyback Process

For pre-1989 temporary service, the deposit process works like this:

1. Submit SF 3108 (Application to Make Service Credit Payment for FERS) through your agency HR office
2. HR certifies the service periods and forwards the application to OPM
3. OPM calculates the deposit amount (1.3% of basic pay plus interest) and issues a billing statement
4. You pay the deposit in full or in installments through Pay.gov
5. Once paid, the service is credited to your record

The deposit must be completed before OPM finalizes your retirement. If you retire without completing it, the pre-1989 service cannot be used to establish title to an annuity or to compute your benefit.

Interest accrues from the midpoint of the service period. For someone buying back temporary seasons from the mid-1980s, the interest alone can be substantial — potentially doubling or tripling the base deposit amount. Run the numbers before deciding whether the investment makes sense for your situation.

Refunded FERS Service

If you previously separated from federal service and withdrew your FERS contributions, you can redeposit them under Public Law 111-84 (National Defense Authorization Act for FY 2010). The redeposit is the refunded amount plus interest. Once completed, the service underlying the refund is restored to your creditable service record.

Checking Your Records

Pull your SF-50 history from your eOPF and segregate your service periods:

• Covered time with deductions: Fully creditable — no action needed
• Pre-1989 non-deduction time: Creditable upon completing an SF 3108 deposit
• Post-1988 non-deduction time: Not creditable under current law
• LWOP periods: Creditable up to 6 months per calendar year

Your service computation date should reflect only the creditable time. If it doesn't match your records, flag the discrepancy with your agency HR office.

The Federal Firefighter Retirement Guide walks through the complete service credit audit with a seasonal-credit worksheet designed for wildland fire career patterns.

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