FERS Pension Calculator

FERS vs. CSRS at a glance

How FERS calculates your pension

The FERS pension formula is one of the most transparent in the defined benefit world: high-3 average salary times years of creditable service times a multiplier. The multiplier is almost always 1.0%, with one exception that matters a lot for planning.

If you retire at age 62 or older with at least 20 years of service, that multiplier becomes 1.1%. On a $100,000 high-3 salary with 25 years of service, the difference is $2,500 per year, every year, for the rest of your life. Staying two more years to hit age 62 can cost less time than it pays back.

The high-3 average salary

Your high-3 is not your most recent salary. It is the average of your three consecutive years of highest basic pay. For most people this means the three years immediately before retirement. Basic pay includes locality pay (5 U.S.C. 5304(c)(2)) but excludes overtime, bonuses, and cash awards.

If you took a lower-grade position at some point, your high-3 might come from several years back. OPM calculates it when you apply, but you can find all your salaries in your Official Personnel Folder or on your SF-50s.

Creditable service

Not every hour you worked counts. Creditable service includes your civilian federal service, military service if you made a deposit to buy it back, certain types of leave without pay, and time under CSRS before 1987 if you transferred to FERS. Part-time service counts proportionally.

If you have military service you haven't deposited, that deposit is almost always worth making. It costs 3% of military base pay for post-1956 service, plus interest if you wait. Adding even two or three years of military service to your creditable total can change your retirement date or your multiplier eligibility.

Standard retirement eligibility

Three paths to immediate unreduced annuity under regular FERS:

• Minimum Retirement Age with 30 or more years of service
• Age 60 with 20 or more years of service
• Age 62 with 5 or more years of service

The Minimum Retirement Age depends on your birth year. If you were born in 1970 or later, your MRA is 57. Earlier cohorts have MRAs between 55 and 57 based on a sliding scale.

FERS retirement paths compared

MRA+10: the deferred annuity trap

FERS has a provision that lets you retire at your MRA with at least 10 years of service even without meeting the standard requirements. The catch is a permanent reduction of 5/12 of 1% for each month your annuity starts before 62. That's 5% a year (5 U.S.C. 8415(h); OPM).

Retire at 57 with 15 years of service and you're 5 years short of 62. The reduction is 25%. A $20,000 annual pension becomes $15,000, permanently. That isn't an early retirement penalty that wears off. It stays.

There is one way to avoid it: postpone the start of your annuity. You can separate at MRA+10 and pick a later start date. Start at 62 and there's no reduction; with 20 or more years of service, starting at 60 also removes it. Each month you wait shrinks the cut. But you get nothing in between. No supplement (MRA+10 never gets one), no pension payments, and FEHB only through 18 months of temporary continuation at full premium plus 2%. You can reenroll when the annuity starts if you had FEHB for the 5 years before you separated (OPM). This works if you have other income. For most people, it doesn't.

VERA: what it changes and what it doesn't

Voluntary Early Retirement Authority lets agencies offer retirement to employees who couldn't otherwise retire yet. The thresholds: age 50 with 20 years of service, or any age with 25 years. OPM has to authorize it, and not every agency gets it.

What VERA does: it lets you retire with an immediate, unreduced annuity before you'd normally be eligible. You don't face the MRA+10 penalty. Your annuity starts right away. The FERS supplement doesn't: under VERA it starts only when you reach your MRA (5 U.S.C. 8421(a)(2)).

What VERA doesn't do: it doesn't add years of service to your calculation. If you have 22 years and leave at 52 under VERA, your pension is based on 22 years, not the 32 years you'd have at 62. That gap is real money. The calculator shows you exactly what staying costs and what leaving costs.

The FERS Special Retirement Supplement

FERS employees who retire before 62 on an immediate unreduced annuity (MRA+30, 60+20, special provision) or under VERA (from the MRA) receive the supplement. MRA+10, deferred and disability retirees don't. It approximates the Social Security benefit you earned during your federal career. OPM's formula: take your estimated SS benefit at 62 and multiply by your years of FERS civilian service (rounded to whole years, up to 40) divided by 40.

With 25 years of service and an estimated SS benefit of $1,800 at 62, that comes to about $1,125 per month. It's real income that cushions the gap between retirement and Social Security eligibility.

It ends after the month you turn 62. Outside earnings can shrink it, even to zero: the earnings test mirrors Social Security's, with $24,480 of 2026 wages exempt and $1 cut for every $2 over that. A year's earnings reduce the supplement paid the following year, starting with the year you retire. Investment income doesn't count. Wages and self-employment income do. Special-provision retirees (law enforcement officers, firefighters, air traffic controllers) who retire before their MRA aren't subject to the earnings test until they reach it (5 U.S.C. 8421a(b)(4)(B)(ii)).

What this calculator doesn't cover

This calculator gives you the pension arithmetic. What it can't model: your TSP balance, Social Security timing, FEHB premium costs in retirement, your survivor benefit election, or the tax impact of your pension income. Those pieces together are what determine whether VERA makes financial sense.

If you're within a year of a VERA decision, a two-hour session with a fee-only advisor who specializes in federal benefits is worth every dollar. The calculation complexity increases sharply once you add Social Security optimization, TSP withdrawal sequencing, and FEHB choices into the same analysis.