The FERS Special Retirement Supplement — often just called "the supplement" or the annuity supplement — is an extra monthly payment that approximates the Social Security benefit you earned during your federal career. It's paid to eligible employees who retire before age 62, and it stops the month you turn 62, when you can claim Social Security itself. In effect, it's a bridge across the years when you're retired but not yet old enough for Social Security.
Why the supplement exists
FERS was designed as a three-legged stool: a modest pension, the Thrift Savings Plan, and Social Security. But Social Security can't start until 62 at the earliest, while FERS lets many employees retire several years earlier. The supplement fills that gap — it pays you roughly what your federal-service portion of Social Security would be worth, so you're not forced to either wait until 62 or drain your TSP early just to cover the in-between years.
That's what makes it so valuable for planning: it can turn an "I can't afford to leave until 62" into "I can comfortably retire at my MRA." But it only works if you qualify, and the rules are specific.
Who qualifies for the FERS supplement
The supplement is only paid if you retire before 62 with an immediate, unreduced annuity. In practice, that means one of these paths:
- Your Minimum Retirement Age (MRA) with 30 years of creditable service.
- Age 60 with 20 years of service.
- Special-category employees — law enforcement officers (LEOs), firefighters, and air traffic controllers (ATCs) — who retire under their special provisions.
Your MRA is between 55 and 57 depending on your birth year (57 for anyone born in 1970 or later). To see which retirement ages give you an immediate, unreduced annuity in the first place, our FERS retirement calculator walks through the eligibility math alongside your pension estimate.
Who does not receive it
- MRA+10 retirees — if you leave at your MRA with at least 10 (but fewer than 30) years and take the reduced annuity, you don't get the supplement.
- Deferred retirees — if you separate and claim your annuity later, there's no supplement.
- Disability retirees — disability annuities are computed differently and don't include it.
- Anyone retiring at 62 or later — you're already eligible for Social Security, so there's nothing to bridge.
Federal Employee Note
Special-category employees get a meaningful break: their supplement isn't reduced by the earnings test until they reach their MRA. For a regular FERS employee, the earnings test applies from the day the supplement starts.
How the supplement is calculated
OPM uses a simplified version of the Social Security formula. The idea in plain terms:
- Estimate the Social Security benefit you'd be entitled to at 62, based on your federal earnings.
- Multiply that by your whole years of FERS civilian service ÷ 40.
So someone with 30 years of service receives roughly 30/40 — about three-quarters — of that estimated benefit each month until 62.
30 years of service, $1,800/mo estimated Social Security at 62
$1,800 × (30 ÷ 40) = ≈ $1,350/month
Paid every month from retirement until the month you turn 62.
20 years of service, $1,800/mo estimated Social Security at 62
$1,800 × (20 ÷ 40) = ≈ $900/month
Fewer years of service means a smaller fraction of the estimated benefit.
Watch Out
Only civilian FERS service counts toward the supplement. If you bought back military time, those years count toward your pension — but they do not count in the supplement calculation. This surprises a lot of veterans who assumed all their service counted the same way.
The earnings test: the rule that can shrink it
This is the part that catches people off guard. Because the supplement stands in for Social Security, it's subject to the same Social Security earnings test. If you take another job after retiring and earn above the annual limit, your supplement is reduced.
For 2026, you can earn up to $24,480 from wages or self-employment before the test kicks in. Above that, your supplement is reduced by $1 for every $2 you earn over the limit. The limit rises most years with inflation.
What matters just as much is what doesn't count. The earnings test only looks at earned income — a paycheck or self-employment income. It ignores:
- Your FERS pension
- TSP withdrawals
- Investment income — dividends, interest, capital gains
- Rental income
So a retiree living on their pension and TSP, not working a wage job, generally keeps the full supplement.
Pro Tip
The reduction isn't taken in real time. OPM sends an annual earnings survey, and any reduction is applied the following year based on what you report. If you plan to work the year you retire, budget for the supplement to be trued-up later rather than cut on the spot.
When the supplement ends
The supplement stops the month you turn 62 — automatically, and whether or not you actually file for Social Security at that age. There's no extension and no option to defer it. It also receives no cost-of-living adjustments: unlike your FERS pension, the dollar amount stays flat the entire time you receive it.
That makes the supplement a fixed, time-limited bridge — predictable, but something to plan around rather than rely on indefinitely.
Where the supplement fits in your bigger picture
On its own, the supplement answers a narrow question: how much extra income will bridge me to 62? The bigger question — can I actually afford to retire when I want to? — means stacking the supplement on top of your pension, your TSP withdrawals, and eventually Social Security into a single monthly number.
That's exactly what the complete Stone Rose Federal Retirement Calculator is built to do, and it's the heart of The Federal Employee's Financial Playbook — which walks through the supplement, FERS, TSP, FEHB, and Medicare coordination in plain language, written by someone who's navigated the system firsthand.
Frequently asked questions
What is the FERS Special Retirement Supplement?
An extra monthly payment that approximates the Social Security you earned in federal service, paid to eligible retirees who leave before 62 and ending the month you turn 62. It's not Social Security, and it doesn't reduce your eventual Social Security benefit.
Who is eligible for the FERS supplement?
Anyone who retires before 62 with an immediate, unreduced annuity: MRA with 30 years, or age 60 with 20 years. Special-category employees (LEO, firefighter, ATC) qualify too. MRA+10, deferred, and disability retirements do not.
How is the FERS supplement calculated?
Estimate your age-62 Social Security benefit, then multiply by your whole years of FERS civilian service ÷ 40. Thirty years yields about 75% of that estimated benefit. Bought-back military service doesn't count toward this figure.
Does working in retirement reduce my FERS supplement?
Yes. It's subject to the Social Security earnings test. In 2026 you can earn up to $24,480 before any reduction; above that, $1 is withheld for every $2 earned. Only wages and self-employment count — not pension, TSP, investments, or rent.
When does the FERS supplement end?
The month you turn 62, whether or not you claim Social Security then. It receives no annual cost-of-living adjustments, so the amount stays flat the entire time.