FERS Pension Calculator — Federal Employee Retirement System Annuity

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How to use

1 Choose your retirement system: FERS (hired 1984+) or CSRS (hired before 1984). Most current federal employees are FERS.
2 Enter your years of creditable service (years and months). Sick leave bank counts toward service for retirement calculation.
3 Enter your High-3 average salary — the highest 36 consecutive months of base pay (excluding overtime, bonuses).
4 Enter your retirement age. The 1.1% FERS multiplier applies only if 62+ with 20+ years of service.
5 Click Calculate to see annual and monthly pension. FERS retirees under 62 with 20+ YOS also receive the FERS Annuity Supplement until age 62, approximating the Social Security earned for federal service.

FERS Pension Formula

Retirement scenario	FERS multiplier	Example: 30 YOS, $80K High-3
Standard (any age, MRA+10 or later)	1.0%	$24,000/year
Age 62+ with 20+ YOS	1.1%	$26,400/year
Air Traffic Controller / FF / LEO	1.7% (first 20 YOS) + 1.0% beyond	$31,200/year (30 YOS)

CSRS Pension Formula (Pre-1984 Hires)

Service tier	Multiplier
First 5 years	1.5%/year
Next 5 years (years 6-10)	1.75%/year
Beyond 10 years	2.0%/year
Maximum (41.7% × High-3)	~41 years 11 months service

FERS Three-Legged Stool

Federal retirees under FERS rely on three sources: (1) FERS pension — calculated above; (2) Social Security — federal employees pay FICA and earn benefits like private workers; (3) Thrift Savings Plan (TSP) — federal 401(k) with up to 5% government match. CSRS retirees instead receive a higher pension but reduced or no Social Security (Government Pension Offset and Windfall Elimination Provision rules).

Minimum Retirement Age (MRA) by Birth Year (FERS)

Birth year	MRA
Before 1948	55
1948–1952	55 + 2 to 10 months
1953–1964	56
1965–1969	56 + 2 to 10 months
1970 or later	57

FERS Annuity Supplement

If you retire under FERS before age 62 with 20+ YOS, you receive the FERS Annuity Supplement — an additional payment approximating the Social Security benefit you've earned through federal service. Stops at age 62 (when you can claim Social Security). Subject to earnings test if you continue working.

FAQ

Q How much will my FERS pension be?

1% of High-3 × Years of Service for most retirees, or 1.1% if retiring at 62+ with 20+ YOS. So 30 YOS at $80K High-3: standard $24,000/year ($2,000/month). With 1.1% multiplier: $26,400/year. Combined with TSP and Social Security, the FERS three-legged stool typically replaces 60-80% of pre-retirement income.

Q When can I retire under FERS?

Several options: (1) Voluntary at MRA (55-57 by birth year) with 30+ YOS, (2) MRA + 10 (immediate but reduced 5% per year under 62), (3) Age 60 with 20 YOS, (4) Age 62 with 5 YOS (most common for full FERS at 1.1% multiplier), (5) Special LEO/FF/ATC categories at age 50 with 20 YOS or any age with 25 YOS.

Q What is the FERS Annuity Supplement?

A supplemental payment for FERS retirees who retire before age 62 with 20+ YOS, approximating the Social Security benefit earned through federal service. Stops at age 62 when you can claim Social Security. Subject to earnings test ($23,400 in 2026 — same as Social Security earnings limit).

Q Is my FERS pension cost-of-living adjusted?

Yes, but with caveats. FERS retirees under 62 generally receive no COLA. At 62+, FERS COLA equals CPI-W increase if under 2%, 2% if CPI between 2-3%, or CPI-1% if over 3%. CSRS COLA tracks CPI-W fully. So FERS retirees lose ~1% per year to inflation in high-inflation periods compared to CSRS or Social Security.

Q How does the Thrift Savings Plan (TSP) work?

TSP is the federal 401(k). Up to 5% government match (1% automatic + dollar-for-dollar match on next 3% + 50% match on next 2%). 2026 contribution limits: $24,500 + $8,000 catch-up (50+) + $11,250 super catch-up (60-63). Choose Traditional or Roth contributions. Investment options: G/F/C/S/I funds plus L (lifecycle target-date) funds.

Q What happens to my pension if I leave federal service before retirement?

Three options: (1) Take refund of your contributions (lose pension entitlement); (2) Defer the pension — collect at age 62 if you have 5+ years of service (or earlier with reductions if 30+ years); (3) Buy back service if you return to federal employment within 5 years. Defer is typically the best option unless you need cash now.

Q Are FERS pensions taxable?

Yes — federal pensions are taxable as ordinary income at the federal level. Most states tax them too, with exceptions: AK, FL, NV, NH, SD, TN, TX, WA, WY have no state income tax. Several states partially exempt federal pensions: NY exempts up to $20,000/year for 59½+; PA exempts pensions entirely after retirement age.

Q How is my High-3 calculated?

Average of your highest 36 consecutive months of base pay (not necessarily the last 3 years — though it usually is). Includes locality pay and certain premium pay; excludes overtime, bonuses, awards, and Sunday/holiday premium. The OPM CSRS/FERS Handbook details which pay types count.