Federal Employees Retirement System: How FERS Works for Federal Employees

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The Federal Employees Retirement System (FERS) is the retirement plan covering most civilian federal workers hired since 1984. It pays benefits from three sources: a defined-benefit pension called the Basic Benefit Plan, Social Security, and the Thrift Savings Plan (TSP).

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FERS was created by the FERS Act of 1986. According to the Congressional Research Service, it is built from these three elements working together, with the pension deliberately smaller than the older system it replaced because it is supplemented by Social Security and the TSP, whose outcomes vary from person to person.

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Knowing how these three parts fit together helps you estimate your retirement income more accurately. This guide explains the pension formula, retirement eligibility, the TSP, the FERS supplement, and common planning questions federal employees face.

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What Is the Federal Employees Retirement System?

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The Federal Employees Retirement System is the three-part retirement program that replaced the Civil Service Retirement System (CSRS) for federal employees entering service after 1983. According to the Congressional Research Service, FERS has three elements: Social Security, the FERS basic retirement annuity, and the Thrift Savings Plan.

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The Basic Benefit Plan is a pension you earn through years of federal service. Social Security works the same way it does for private-sector workers, because FERS employees pay into it. The TSP is a tax-advantaged retirement savings account similar to a private-sector 401(k).

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Together, these three components replace a meaningful share of your pre-retirement income. Each one serves a different purpose.

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The Three Parts of FERS

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Each component of the Federal Employees Retirement System does a distinct job. Treating them as one lump sum is a common planning mistake.

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The Basic Benefit Plan is your guaranteed monthly pension, calculated from your salary and years of service and paid for life. The Social Security component functions as it does for any covered worker: you earn credits, and your benefit reflects your lifetime earnings history.

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The Thrift Savings Plan (TSP) is the federal government's tax-advantaged retirement savings program, administered by the Federal Retirement Thrift Investment Board. It's where your own contributions and agency matching contributions accumulate and grow over a career.

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The table below shows how the three parts differ in funding and payout.

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How the FERS Pension Is Calculated

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For most regular non-disability retirements, the FERS Basic Benefit Plan uses one formula: your High-3 average salary times your years of creditable service times a percentage multiplier. According to the U.S. Office of Personnel Management (OPM), the multiplier is 1% per year of service for most retirees, rising to 1.1% if you retire at age 62 or later with at least 20 years of service.

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The High-3 average salary is the average of your highest three consecutive years of basic pay. OPM defines this as base salary plus locality pay, but not overtime or bonuses.

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Special category employees use different formulas. These include law enforcement officers, firefighters, air traffic controllers, Capitol Police, Supreme Court Police, and nuclear materials couriers. OPM applies a 1.7% multiplier to the first 20 years of service for certain of these special provisions.

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Here is the formula in practice. A federal employee with a $100,000 High-3 and 25 years of service who retires before age 62 earns $100,000 × 25 × 1.0% = $25,000 per year. The same employee retiring at 62 with 20-plus years qualifies for the 1.1% multiplier: $100,000 × 25 × 1.1% = $27,500 per year.

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That higher multiplier produces a 10% larger annuity for the same High-3 salary and years of service. This is why the age-62 threshold matters so much in retirement timing.

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Unused sick leave also increases the pension. According to OPM, unused sick leave converts to creditable service using a factor of 2,087 hours per year and adds to your service time for the annuity computation. It cannot be used to establish eligibility to retire.

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FERS Retirement Eligibility and Minimum Retirement Age (MRA)

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Eligibility for an immediate FERS pension depends on hitting one of several age-and-service combinations. The anchor for most of them is your Minimum Retirement Age (MRA), the earliest age a FERS employee can retire with an immediate annuity.

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According to OPM, you qualify for an immediate, unreduced annuity at your MRA with 30 years of service, at age 60 with 20 years, or at age 62 with 5 years. You can also retire under the MRA+10 provision with at least 10 years of service, but OPM notes your benefit is then reduced by 5% for each year you are under age 62.

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Your MRA is set by your birth year. According to OPM's published schedule, the MRA rises gradually from 55 to 57.

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For most of today's workforce, born in 1970 or later, the MRA is 57. Reaching your MRA is only half the equation, though. As the combinations above show, retiring at your MRA without 30 years of service triggers the age reduction unless you postpone your annuity start date.

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The FERS Supplement: Bridging the Gap to Social Security

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The FERS Special Retirement Supplement (SRS) is a temporary payment that approximates the Social Security benefit you earned during federal service. It's paid until age 62 for those who qualify.

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According to OPM, it goes to employees who retire on an immediate, unreduced annuity before age 62, meaning those who reach their MRA with 30 years of service, or age 60 with 20 years. Special category employees and certain early or involuntary retirees may also qualify under OPM rules.

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Not everyone who qualifies receives it right away. For some early and involuntary retirees, the supplement begins only when they reach their MRA rather than at the date they separate. Disability retirees, deferred retirees, MRA+10 retirees, and those retiring at age 62 or later don't qualify.

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You can estimate the supplement by taking your projected age-62 Social Security benefit and multiplying it by a fraction: your years of FERS service divided by 40. A projected $2,000 monthly Social Security benefit with 30 years of FERS service produces roughly $2,000 × (30/40) = $1,500 per month.

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This is a simplified estimate. OPM's actual calculation uses an adapted Social Security formula. According to OPM, the supplement ends at age 62 whether or not you claim Social Security then, and it is subject to the Social Security earnings test if you have wage or self-employment income.

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Learn who qualifies for the FERS Supplement and how much you could receive. 

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The Thrift Savings Plan (TSP): Your Third Pillar

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The Thrift Savings Plan (TSP) is the federal government's tax-advantaged retirement savings program, and it's the part of FERS you control most directly. Agency matching makes your contributions especially valuable.

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According to the Thrift Savings Plan, the maximum agency contribution is 5% of your basic pay when you contribute at least 5% yourself: a 1% automatic contribution plus a 4% match. Contribute less than 5%, and you may miss part of the available agency match.

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The IRS sets annual contribution limits. According to the Thrift Savings Plan, the elective deferral limit for 2026 is $24,500. Employees age 50 and older can add a catch-up contribution of $8,000, and under Section 109 of the SECURE 2.0 Act, participants turning 60, 61, 62, or 63 during 2026 have a higher catch-up limit of $11,250.

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The enhanced age 60–63 catch-up replaces the standard catch-up amount. It is not added on top of the $8,000 catch-up.

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One 2026 change is worth flagging. According to the Thrift Savings Plan, for participants whose prior-year FICA wages exceeded $150,000, catch-up contributions must be made as Roth contributions once they reach the annual pre-tax traditional contribution limit. This provision comes from Section 603 of the SECURE 2.0 Act.

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FERS vs. CSRS: How the Two Systems Differ

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Federal benefits genuinely vary by retirement system, and knowing which one covers you determines everything else. The core difference is straightforward. FERS is a three-part system that includes Social Security and the TSP, while the Civil Service Retirement System (CSRS) is a stand-alone pension for employees who generally entered service before 1984 and does not include Social Security coverage for that federal work.

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According to the Congressional Research Service, FERS annuities are smaller than CSRS annuities by design, because Social Security benefits and the TSP supplement them.

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If you transferred from CSRS to FERS mid-career, OPM notes that the portion of your service accrued under CSRS is computed under the CSRS formula, so your annuity can blend both systems.

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Understand how FERS and CSRS impact retirement planning. 

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Reductions That Can Lower Your FERS Pension

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Two adjustments most commonly reduce the FERS pension, and both are worth planning for before you retire. The first is the age reduction. According to OPM, if you retire under MRA+10 with 10 or more years of service before age 62, your benefit drops by 5/12 of 1% for each full month you are under 62, or 5% per year.

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Retire at 57 under this provision, and you take a permanent 25% reduction, not a temporary one.

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The second is the survivor benefit election. According to OPM, electing a full survivor annuity equal to 50% of your benefit reduces your own annuity by 10%, while a 25% survivor benefit reduces it by 5%.

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This election is permanent once you retire. It also affects your spouse's ability to keep Federal Employees Health Benefits (FEHB) coverage after your death, so it deserves careful review with your spouse and a benefits professional.

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Keeping FEHB Coverage in Retirement

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Federal Employees Health Benefits (FEHB) is the health insurance program covering most federal workers, and it can continue into retirement, but only if you meet two conditions. According to OPM, you must be entitled to retire on an immediate annuity, and you must have been continuously enrolled in any FEHB plan, or covered as a family member, for the five years of service immediately before your annuity begins, or for your full period of service if that is less than five years. This is often called the FEHB five-year rule.

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Two details commonly trip up planners. According to OPM, the five years don't have to be in the same plan, and time covered as a family member under another person's enrollment counts toward the requirement.

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OPM also notes that an MRA+10 retirement satisfies the immediate-annuity requirement, and an employee who postpones that annuity can re-enroll in FEHB when the annuity later begins. A deferred retirement, by contrast, means leaving federal service and claiming the pension later, and it does not preserve FEHB eligibility.

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Health coverage is one of the most valued parts of the federal benefits package. Confirming your FEHB enrollment history well before your planned retirement date is worth doing early. OPM makes the final determination of retiree FEHB eligibility when it processes your retirement application.

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Planning Your FERS Retirement

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The Federal Employees Retirement System rewards employees who understand how its three parts fit together: a pension driven by your High-3 and years of service, Social Security, and a TSP that grows with agency matching. The highest-leverage decisions reward planning done years ahead rather than in your final weeks on the job: timing your retirement around the 1.1% multiplier at age 62, preserving eligibility for the FERS supplement, capturing the full TSP match, and weighing survivor and FEHB elections.

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TSP limits can change annually, while FERS eligibility and MRA rules should be verified with OPM before retirement. Confirm the numbers that apply to your situation against OPM.gov and TSP.gov before making decisions.

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Your choices depend on your own service record, salary history, and family situation. A licensed professional who understands FERS, TSP, Social Security, and federal benefits can help you review how the pieces fit together for your circumstances.

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Frequently Asked Questions

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1. When can I retire under FERS with full benefits?

 You can retire with an immediate, unreduced FERS annuity at your Minimum Retirement Age with 30 years of service, at age 60 with 20 years, or at age 62 with 5 years. According to OPM, your MRA falls between 55 and 57 depending on your birth year. It's 57 for anyone born in 1970 or later.

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2. How is my federal pension calculated?

According to OPM, your FERS pension equals your High-3 average salary times your years of creditable service times a multiplier. The multiplier is 1% per year, or 1.1% if you retire at age 62 or later with at least 20 years of service. Your High-3 is the average of your highest three consecutive years of basic pay.

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3. Can I collect FERS and Social Security at the same time?

Yes. The Federal Employees Retirement System is built to include Social Security as one of its three components. FERS employees pay Social Security taxes throughout their careers and can draw both a FERS pension and Social Security benefits, along with TSP withdrawals, once eligible for each.

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4. What is the FERS supplement and who qualifies?

The FERS Special Retirement Supplement bridges income from retirement until age 62. According to OPM, it goes to employees who retire on an immediate, unreduced annuity before 62: those at MRA with 30 years, or age 60 with 20 years, plus certain special-category and involuntary retirees. Deferred and MRA+10 retirees don't qualify.

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5. How much should I contribute to my TSP?

Contribute at least 5% of your basic pay to capture the full agency match. According to the Thrift Savings Plan, contributing 5% earns a 1% automatic contribution plus a 4% match. The 2026 elective deferral limit is $24,500, with additional catch-up room for employees age 50 and older.

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6. What happens to my FEHB coverage when I retire?

Your Federal Employees Health Benefits coverage can continue into retirement. According to OPM, you must retire on an immediate annuity and have been continuously enrolled in an FEHB plan for the five years immediately before your annuity begins, or since your first chance to enroll. Deferred retirees lose this eligibility.

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7. What happens to my TSP when I leave federal service?

Your TSP account stays yours after you separate. You can leave the balance invested, roll it over, take withdrawals, or purchase a TSP life annuity. According to the Thrift Savings Plan, the minimum amount to purchase a TSP life annuity is $3,500, and withdrawal rules and tax treatment depend on your age and separation timing.

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Diclaimer

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This article is for educational purposes and reflects federal retirement rules as of 2026. It is not personalized financial, legal, or tax advice. Verify all figures against OPM.gov, TSP.gov, and SSA.gov before making retirement decisions.

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