Title 5 › PART III — EMPLOYEES › Subpart G — Insurance and Annuities › CHAPTER 84 — FEDERAL EMPLOYEES’ RETIREMENT SYSTEM › SUBCHAPTER II — BASIC ANNUITY › § 8421
People who get certain federal annuities also get a monthly annuity supplement while they keep that annuity. Some annuitants must be at least the law’s minimum retirement age to get the supplement. If an annuity does not start before a person turns 62, they do not get the supplement. The supplement stops the month before the person could get Social Security old‑age benefits after applying, and it ends no later than the month they turn 62. The monthly supplement equals the Social Security retirement benefit the person would get at age 62 (calculated as if they were fully insured on January 1 of the year the supplement starts, and applying the maximum early‑retirement reduction that fits their birth year) multiplied by a fraction based on years of service. That fraction is the person’s years of service (round to the nearest whole year, with .5 rounded up, capped at 40) divided by 40. When figuring the Social Security amount, only basic pay counts; years after the separation that led to the annuity and before age 62 count as zero; and partial years before separation are adjusted using a formula based on average wages and the person’s basic pay in their first full service year. Military service is not counted as service. The supplement is handled the same way as certain other annuity amounts for administrative rules.
Full Legal Text
Government Organization and Employees, Source: USLM XML via OLRC
Legislative History
Reference
Citation
5 U.S.C. § 8421
Title 5, Government Organization and Employees
Last Updated
Aug 21, 2026
Release point: 119-102