FERS Retirement Calculator

May 3, 2026

The FERS retirement calculator gives federal employees a clear, numbers-based projection of their future basic annuity – the pension check that arrives every month after you leave government service. It pulls together your high-3 salary, total years of creditable service, and your retirement age to produce an estimate you can use for planning.

FERS, the Federal Employees Retirement System, covers most civilian employees hired since 1984. The pension sits inside a three-part retirement package: the FERS basic annuity, Social Security, and the Thrift Savings Plan (TSP). The calculator focuses on that first piece – the defined benefit – because the other two components are handled separately.

Your Information

Date of Birth Determines your Minimum Retirement Age (MRA)

Service Start Date Your initial federal employment date

Planned Retirement Date When you plan to separate from federal service

High-3 Average Salary ($) Highest 3 consecutive years of basic pay (includes locality, excludes overtime & bonuses)

Employment Category Law enforcement officers, firefighters, and air traffic controllers use a higher multiplier

How This Calculation Works

Formula: High-3 Salary × Years of Service × Multiplier

Regular employees: 1% multiplier, or 1.1% if retiring at age 62+ with 20+ years of service.

Special provisions: 1.7% for the first 20 years, 1.0% for each additional year.

Reductions: If retiring at MRA with 10–29 years and under age 62, the annuity is reduced 5% per year under 62.

FERS Supplement: If you retire before 62 under an immediate, unreduced annuity, you may receive the supplement until age 62.

This calculator follows 2026 OPM guidelines. Results are gross estimates before deductions for health insurance, survivor benefits, or taxes.

Disclaimer: This tool provides estimates for informational purposes and is not a guaranteed benefit statement. Official retirement calculations should be obtained from the Office of Personnel Management or a qualified federal benefits advisor. Complex situations such as part-time service, military buybacks, or survivor benefit elections are not reflected.

The calculator above requires only a few variables: birth date, federal service start date, planned retirement date, high-3 average salary, and your employment category (regular or special provision). It applies the correct age multiplier and service rules for 2026 and returns a monthly annuity figure. The estimate does not factor in taxes or reductions for survivor benefits, but it is detailed enough to guide career decisions.

How Does the FERS Retirement System Work?

FERS splits retirement income into three layers. First, the basic annuity – a monthly pension funded by employee contributions (4.4% of salary for those hired after 2013) and agency and government contributions. Second, Social Security, which federal employees pay into at the same 6.2% rate as private-sector workers. Third, the TSP, a tax-advantaged defined-contribution plan similar to a 401(k), with agency matching on the first 5% of salary.

Together, these three pieces are meant to replace roughly 60–70% of pre-retirement income. The precise share depends on how many years you serve, how much you save in the TSP, and when you claim Social Security.

What Is the FERS Basic Annuity Formula?

The formula for a regular FERS employee is straightforward:

Monthly Annuity = High-3 Average Salary × Years of Creditable Service × Multiplier

The multiplier is 1% for most workers. However, if you wait until age 62 and have 20 or more years of service, the multiplier becomes 1.1% – a permanent 10% increase in your pension for the rest of your life.

For example, a federal employee with 30 years of service and a high-3 of $95,000 who retires at 58 would receive:

$95,000 × 30 × 1% = $28,500 per year, or $2,375 per month.

If that same employee delayed retirement to 62, the calculation would be:

$95,000 × 30 × 1.1% = $31,350 annually, or $2,612.50 per month.

The calculator automatically selects the correct multiplier based on your inputs and 2026 OPM guidelines.

How Your High-3 Salary Affects the Pension

The high-3 salary is the highest average basic pay you earned during any three consecutive years of federal service. Basic pay includes locality pay but excludes overtime, bonuses, cash awards, and travel reimbursements. For most employees, the final three years of a career produce that high-water mark, but not always – a temporary assignment or a grade increase earlier in a career can sometimes set the high-3.

Because the annuity is directly proportional to the high-3, even a 5% increase in salary during those three years can lift the lifetime pension by the same amount. The calculator uses the figure you provide, so entering an accurate, current projection matters.

FERS Age Multipliers and Service Years

Eligibility determines which multiplier gets used and whether any reduction applies:

Age 62 or later with 20+ years of service: 1.1% multiplier, unreduced annuity
Age 60 with 20+ years: 1% multiplier, unreduced
MRA + 30 years of service: 1% multiplier, unreduced (MRA ranges from 55 to 57 depending on birth year; for those born in 1970 or later, MRA is 57)
MRA + at least 10 years of service: 1% multiplier, but reduced by 5% for each year the employee is younger than age 62
Separation before MRA but with 5+ years of service: deferred annuity, payable at age 62 (unreduced) or earlier at a reduced rate

A 30-year FERS employee born in 1972 who started federal service at 25 can retire at 57 with 32 years of service and receive an immediate, unreduced annuity because they meet the MRA+30 rule. The calculator checks that combination and applies the correct rule without any reduction.

FERS Special Provisions for Law Enforcement and Firefighters

Firefighters, law enforcement officers (LEOs), and air traffic controllers fall under special provision rules. Their annuity formula uses:

1.7% per year for the first 20 years of covered service
1.0% per year for each additional year beyond 20

They can retire at any age with 25 years of covered service, or at age 50 with 20 years. Their multiplier is locked at the higher rate regardless of age at retirement, making the pension significantly larger for equivalent service.

An LEO with 25 years of service and a high-3 of $105,000 would see:

[(20 × 1.7%) + (5 × 1.0%)] = 34% + 5% = 39% of high-3
$105,000 × 39% = $40,950 per year, or $3,412.50 per month.

Selecting “Special Provisions” in the calculator triggers this dual-multiplier logic.

Employees who retire before age 62 under an immediate, unreduced annuity – for instance, under MRA+30 or Age 60+20 – receive the FERS supplement. The supplement approximates the Social Security benefit credited for federal service and stops at 62, whether or not you file for Social Security. The calculator does not estimate the supplement because it requires a full Social Security earnings history, but it flags eligibility when the retirement age input meets the criteria.

Social Security benefits are completely separate and will be paid from age 62 (or later if you delay) based on your lifetime earnings. The FERS basic annuity remains constant for life, with cost-of-living adjustments (COLAs) after age 62.

How the Thrift Savings Plan Boosts Your Retirement

The TSP is the portion of FERS that you directly control. Agency automatic contributions (1% of salary) plus matching contributions (up to 4% additional) create a growing balance that you can withdraw after separation. The calculator does not project a TSP balance, but it highlights the annuity gap that TSP and Social Security must fill.

A practical approach: if your FERS basic annuity replaces 30% of your final salary, you need another 35–40% from Social Security and TSP withdrawals to reach the 70% replacement target. Federal planners often suggest saving at least 5% of salary in the TSP from day one to capture the full match.

Using the FERS Retirement Calculator: Inputs and Outputs

The calculator above works with five inputs that any federal employee can pull from their personnel records or Leave and Earnings Statement:

Date of birth – determines MRA and age at retirement
Service start date – establishes total years of creditable service
Planned retirement date – drives the multiplier and reduction analysis
High-3 average salary – your best three-consecutive-year average basic pay
Category – regular or special provisions (LEO, firefighter, ATC)

The output is the gross monthly annuity before any deductions for health insurance, survivor benefits, or taxes. Always check with your agency’s retirement office for a binding estimate, especially if your service includes part-time tours, non-deduction service, or military buyback periods.

Disclaimer: This tool provides estimates for informational purposes and is not a guaranteed benefit statement. Official retirement calculations should be obtained from the Office of Personnel Management or a qualified federal benefits advisor.

Frequently Asked Questions

What is the FERS basic annuity formula?

For regular employees, the formula is 1% of your high-3 average salary multiplied by years of creditable service. If you retire at age 62 or later with at least 20 years of service, the multiplier increases to 1.1%. Special category employees such as law enforcement officers and firefighters use 1.7% for the first 20 years and 1% for each additional year.

How does the FERS supplement work?

The FERS supplement bridges the gap between early retirement and Social Security eligibility at age 62. It approximates the Social Security benefit earned during your federal service and is paid monthly until you turn 62. To qualify, you must be eligible for an immediate, unreduced FERS annuity before age 62.

When can I retire under FERS?

Your minimum retirement age (MRA) depends on your birth year. For federal workers born in 1970 or later, the MRA is 57. With at least 10 years of service, you can retire at MRA with a 5% per year reduction. Unreduced benefits are available at age 60 with 20 years or at age 62 with 5 years.

How is the high-3 salary calculated?

The high-3 salary is the highest average basic pay you earned during any three consecutive years of federal service. It uses base salary only–locality pay is included, but overtime, bonuses, and allowances are excluded. Your annuity is based on this average, making career timing critical.

Does the calculator include Social Security?

The calculator focuses on the FERS basic annuity, which is the defined-benefit portion of your federal retirement. It does not project Social Security or TSP balances directly. However, the estimate assumes you will also receive Social Security and can combine it with TSP withdrawals for a full retirement picture.

Can I use the calculator if I’m under CSRS?

No, this calculator is designed exclusively for FERS employees. The Civil Service Retirement System (CSRS) uses a different formula–typically 1.5% of high-3 for the first 5 years, 1.75% for the next 5, and 2% for additional years. Using a CSRS calculator is necessary if you are not covered by FERS.

How accurate is the FERS retirement estimate?

The estimate is based on the standard OPM formula and your inputs, so it accurately reflects the calculation methodology. However, it does not account for complex situations like part-time service, military buybacks, or survivor benefit elections. Treat it as a planning tool and verify with your agency’s benefits office.