FERS Supplement Calculator

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Rules checked against OPM/TSP pages · Last updated October 27, 2026

Estimate only, not financial advice. Your official figures come from OPM when your retirement is processed.

Simplifications: Uses your Social Security estimate at 62 as a stand-in. OPM recomputes it from FERS-only earnings with deemed wages, so the real figure can differ. Years are rounded to the nearest whole year and capped at 40 per 5 CFR 842.504. Earnings test uses the 2027 limit; special-provision retirees are exempt until their MRA.

Social Security estimate at age 62 ($/month, from ssa.gov/myaccount)Years of FERS civilian service (OPM rounds to the nearest whole year)Expected yearly earnings from work after retiring ($)

Estimate only, not financial advice. Your official figures come from OPM when your retirement is processed.

Sources: OPM FERS Computation · OPM FERS Eligibility · TSP RMDs