Step-by-step: the 1% multiplier, high-3 salary, MRA eligibility rules, the 1.1% bonus at 62, and special category formulas for LEO, firefighters, and air traffic controllers.
Your FERS pension is the foundation of your federal retirement — but most employees don't know exactly how it's calculated until they're close to leaving. The formula is straightforward once you understand three inputs: your years of creditable service, your high-3 average salary, and the multiplier that ties them together.
Annual FERS Pension = Years of Service × High-3 Average Salary × Multiplier
For most FERS employees, the multiplier is 1% per year of service. If you have 28 years of service and a high-3 average salary of $95,000, your annual pension is:
28 × $95,000 × 1% = $26,600/year ($2,217/month before taxes)
If you retire at age 62 or older with at least 20 years of creditable service, your multiplier increases to 1.1%. That same 28-year, $95,000 scenario now looks like:
28 × $95,000 × 1.1% = $29,260/year ($2,438/month)
That's $2,660 more per year — for life — simply by waiting until 62. Over a 20-year retirement, the 1.1% multiplier is worth more than $53,000 in additional pension income. It's the single most impactful planning decision most FERS employees can make.
The high-3 is the average of your three highest consecutive years of basic pay. A few important notes:
If you received a significant promotion or step increase in your final years, that high-3 will be higher than your current salary suggests. If you moved to a lower-paying position near the end of your career, it could be lower.
You can't collect your FERS pension at any age — you must meet a minimum retirement age based on your year of birth:
| Birth Year | MRA |
|---|---|
| Before 1948 | 55 |
| 1948–1952 | 55 + 2 months per year after 1947 |
| 1953–1964 | 56 |
| 1965–1969 | 56 + 2 months per year after 1964 |
| 1970 or later | 57 |
Most employees born after 1970 — the majority of the current federal workforce — have an MRA of 57. To retire with an immediate, unreduced pension, you need to meet one of these combinations:
Law enforcement officers, firefighters, and air traffic controllers have a more generous formula because of the physical demands of their work and mandatory retirement ages:
Special category formula:
An LEO with 25 years of covered service and a $110,000 high-3:
(20 × 1.7%) + (5 × 1.0%) × $110,000 = (34% + 5%) × $110,000 = $42,900/year
Special category employees can retire as early as age 50 with 20 years of covered service, or at any age with 25 years.
Not all time with the federal government counts equally. Creditable service generally includes:
Time on Leave Without Pay (LWOP) beyond six months in a calendar year generally does not count.
FERS replaced CSRS for new employees starting January 1, 1987. If your Service Computation Date (SCD) is before 1984, you're likely under CSRS, which uses a different (and generally more generous) formula: 1.5% for the first 5 years, 1.75% for the next 5, and 2% for each year after that. CSRS employees don't pay into Social Security for federal service, so there's no FERS Supplement or Social Security benefit from those years.
Your calculated pension is the gross amount before any SBP election. If you elect to cover a spouse under the Survivor Benefit Plan, a portion of your pension (up to 6.5% of the designated base) is deducted as a premium, in exchange for your spouse receiving 55% of that base if you die first. This is a separate decision from pension calculation but affects your net monthly check.
The calculation above uses round numbers for illustration. Your actual pension depends on your precise birth date, service computation date, and pay history. High-3 Retirement Planner computes your FERS pension to the dollar using your exact inputs — including the 1.1% multiplier check, special category formulas, MRA eligibility, and sick leave conversion.
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