FERS Retirement Planning Guide 2026: How to Calculate Your FERS Pension and Avoid Costly Mistakes

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FERS retirement planning is the process of coordinating your three-part federal retirement income (the FERS basic annuity, the Thrift Savings Plan, and Social Security) so they pay out at the right ages, in the right order, and with the right tax treatment. Some federal employees may lose significant retirement income not because the FERS formula is unfair, but because they retire on a date that costs them the 1.1% multiplier, leave a partial year of service on the table, or trigger an avoidable FEHB or survivor-benefit error.

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This 2026 FERS retirement planning guide walks through how to calculate your FERS pension, the deadlines and age thresholds that matter, and the most common mistakes Federal Pension Advisors sees employees consider in the final 24 months before retirement.

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What Is FERS and How Does It Work in 2026?

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FERS, the Federal Employees Retirement System, covers nearly every federal civilian employee hired since January 1, 1987. It's a three-legged system: a defined-benefit pension (the FERS basic annuity) paid by OPM, the U.S. Office of Personnel Management; a defined-contribution account through the TSP, or Thrift Savings Plan, the federal government's tax-advantaged retirement savings program; and Social Security benefits administered by the Social Security Administration.

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FERS replaced CSRS, the Civil Service Retirement System, for new hires and pays a smaller pension than CSRS by design. That's because most FERS employees also receive Social Security and a government TSP match, while CSRS employees generally do not.

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Understanding which leg pays what, and when, is the foundation of every FERS retirement plan.

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How Is the FERS Pension Calculated?

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The FERS basic annuity uses a simple three-part formula:

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FERS Annuity = High-3 Average Salary × Years of Creditable Service × Multiplier (1.0% or 1.1%)

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Your High-3 is the average of your highest three consecutive years of base pay. That's typically your final three years, but not always.

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Years of creditable service include all federal civilian service plus any deposited military time. The multiplier is 1.0% for most retirees, but it jumps to 1.1% if you retire at age 62 or later with at least 20 years of service.

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According to OPM's FERS computation guidance, that 0.1% bump is worth 10% more pension for life. It's one of the most important pension-timing decisions in federal retirement planning.

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A Worked Example

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Consider an employee with a High-3 of $110,000 and 30 years of service:

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• Retiring at age 60: $110,000 × 30 × 1.0% = $33,000 per year
• Retiring at age 62: $110,000 × 30 × 1.1% = $36,300 per year

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That two-year delay produces $3,300 more every year for the rest of the retiree's life. The FERS annuity is also partially indexed to inflation through annual COLAs (Cost-of-Living Adjustments) published by OPM.

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FERS Retirement Eligibility: MRA and the Age Thresholds That Matter

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To retire with an immediate, unreduced FERS annuity, you must meet both an age and a years-of-service threshold. The earliest age you can retire under FERS is the MRA, or Minimum Retirement Age, the earliest age a FERS employee can retire with an immediate annuity. Your MRA depends on your birth year and ranges from 55 to 57.

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FERS Retirement Eligibility at a Glance

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Source: OPM, the U.S. Office of Personnel Management, FERS retirement eligibility guidance.

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MRA + 10 is the most misunderstood category. It lets you retire as early as your MRA with just 10 years of service, but the annuity is reduced by 5% for every year you are under 62. That's a permanent cut.

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Per OPM, the reduction can be reduced or avoided by postponing the annuity start date, depending on your age and years of service at that future date. The right choice depends on your individual circumstances, and Federal Pension Advisors recommends modeling both immediate and postponed scenarios before electing.

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The TSP: Your Second Leg, and a Major Source of Retirement Income

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For many FERS employees, the TSP can become a major source of retirement income alongside the FERS basic annuity and Social Security. According to the Federal Retirement Thrift Investment Board, TSP participation rates and average balances have grown substantially over the past decade. For some long-career employees, the TSP becomes one of their largest retirement assets.

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2026 TSP Contribution Limits

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For the 2026 plan year, the IRS-set TSP elective deferral limit is $24,500 for employees under age 50. Employees aged 50 and over can make additional catch-up contributions. Under SECURE 2.0, the enhanced catch-up limit for employees ages 60–63 is $11,250 in 2026, according to the TSP contribution limits.

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The TSP Match: One of the Most Valuable Decisions in Federal Service

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The federal government matches TSP contributions up to 5% of basic pay: a 1% automatic agency contribution plus a dollar-for-dollar match on the first 3% and a 50-cent match on the next 2%.

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If you're contributing less than 5%, you're leaving free money on the table. That's one of the most common TSP mistakes Federal Pension Advisors sees among employees in their first decade of service.

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How to Calculate Your FERS Pension: A Step-by-Step Walkthrough

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Here's the calculation sequence Federal Pension Advisors uses with clients in retirement reviews:

• Pull your latest SF-50 and Leave & Earnings Statement. Confirm your Service Computation Date (SCD) for retirement, not the SCD for leave, which is different.

• Calculate your creditable service. Add federal civilian service plus any deposited military time. Convert to years and months.

• Identify your High-3. Look at your highest three consecutive years of base pay. Locality pay counts; bonuses, overtime, and awards do not.

• Determine your multiplier. Use 1.1% only if you will be 62 or older at retirement AND have at least 20 years of service. Otherwise, use 1.0%.

• Apply the formula. High-3 × Years of Service × Multiplier = gross annual FERS annuity.

• Subtract deductions. Survivor benefit elections (typically 10% for full survivor), FEHB premiums, FEGLI premiums, and federal/state taxes all reduce your net check.

• Layer in the FERS Supplement (if eligible). Employees who retire before age 62 with an immediate, unreduced annuity often qualify for the FERS Supplement, which approximates the Social Security benefit you earned during federal service and stops at age 62.

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The Six Most Common FERS Retirement Planning Mistakes

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In many federal retirement reviews, the same planning issues appear repeatedly. These are the mistakes Federal Pension Advisors most often sees, and they tend to have the largest financial impact.

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1. Retiring just before qualifying for the 1.1% multiplier. If you wait until age 62 with at least 20 years of service, your multiplier goes from 1.0% to 1.1%. That raises the pension formula by 10% before other factors. Employees close to both thresholds should model both scenarios carefully. Even a short delay can lock in a meaningfully higher annuity for life.

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2. Dropping FEHB at retirement. To carry FEHB, the Federal Employees Health Benefits Program, into retirement, OPM generally requires you to have been enrolled in FEHB for the five years immediately preceding your retirement date (or for all service since you were first eligible). If you drop FEHB during that five-year window, you may lose the right to carry coverage into retirement, unless a specific OPM exception or waiver applies.

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3. Misunderstanding the FERS Supplement earnings test. The FERS Supplement is subject to an earnings test starting the year after you reach MRA. According to OPM, earnings above the annual Social Security exempt amount can reduce the FERS Supplement by $1 for every $2 over the limit.

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4. Electing the wrong survivor benefit. A full survivor annuity costs 10% of your annuity for life and provides 50% to a spouse after your death. A partial provides 25% for a 5% cost. Choosing "none" requires written, notarized spousal consent, and once elected, the choice is largely irrevocable.

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5. Not depositing military service. Post-1956 military time only counts toward your FERS annuity if you make a military deposit (typically 3% of military base pay plus interest). The deposit window is generous, but interest accrues, and delays cost real money.

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6. Withdrawing from the TSP before age 59½ without a qualifying exception. Early withdrawals can trigger a 10% IRS penalty on top of ordinary income tax. According to the IRS list of exceptions to tax on early distributions, exceptions apply. These include the separation-from-service exception for employees who separate during or after the year they reach age 55 (age 50, or 25 years of service, for certain public safety employees under IRC Section 72(t)). The exact rules are fact-specific, and the IRS publishes the current list of exceptions.

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CSRS vs. FERS: A Quick Comparison

Most employees today are under FERS, but CSRS Offset and CSRS employees still working should understand the structural differences.

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Source: OPM, the U.S. Office of Personnel Management, CSRS and FERS Handbook.

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How FEHB and FEGLI Fit Into Retirement Planning

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FEHB, the Federal Employees Health Benefits Program, is one of the most valuable post-retirement benefits in federal service. Eligible retirees generally continue FEHB with the government contribution continuing. That share is typically around 72% of the weighted average premium, with the exact amount varying by plan.

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That level of employer contribution isn't available to most private-sector retirees. The FEHB five-year enrollment rule published by OPM is central to eligibility, so if you're within five years of retirement, confirm continuous FEHB enrollment now.

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FEGLI, the Federal Employees Group Life Insurance program, follows different rules. Coverage can be continued into retirement, but premiums for Option B and Option C rise sharply with age. Federal Pension Advisors frequently sees retirees overpay for FEGLI Option B when comparable term coverage outside the program would cost less.

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Building Your 2026 FERS Retirement Plan

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A complete FERS retirement plan answers six questions in writing. What is your exact retirement date? Will you qualify for the 1.1% multiplier? How will you bridge income before Social Security and the TSP become accessible? What survivor benefit have you chosen, and does your spouse agree in writing? Will you carry FEHB and FEGLI into retirement? What is your TSP withdrawal sequence, and how does it interact with Required Minimum Distributions starting at the age set by SECURE 2.0?

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Federal Pension Advisors recommends starting this written plan no later than five years before your target retirement date. The decisions that drive retirement outcomes (the multiplier, the FEHB five-year rule, the military deposit window, and the survivor election) all turn on deadlines, not on market performance.

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FAQ: FERS Retirement Planning

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

Under FERS, you can retire with a full, unreduced annuity at age 62 with 5 years of service, at age 60 with 20 years, or at your MRA (Minimum Retirement Age, 55–57 depending on birth year) with 30 years. Retiring under MRA + 10 is also possible, but it reduces your annuity by 5% for each year you are under age 62.

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2. How is my FERS pension calculated?

The FERS pension formula is your High-3 average salary multiplied by your years of creditable service multiplied by a multiplier of 1.0%, 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 base pay. According to OPM, this formula has been unchanged since FERS was enacted.

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

Yes. FERS is specifically designed to be paid alongside Social Security, unlike CSRS. Many FERS retirees receive three income streams in retirement: the FERS basic annuity from OPM, Social Security benefits starting as early as age 62, and withdrawals from the TSP. These streams are independent and don't reduce one another.

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4.What is the FERS Supplement and who qualifies?

The FERS Supplement is a benefit paid to FERS retirees who retire before age 62 with an immediate, unreduced annuity. It approximates the Social Security benefit you earned during federal service and is paid by OPM until you reach age 62. The Supplement may be reduced if your earnings exceed the annual Social Security exempt amount, and it ends entirely at age 62 even if you delay Social Security.

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

Eligible retirees can generally continue FEHB into retirement with the government contribution continuing, though the exact enrollee share varies by plan. Eligibility typically requires continuous FEHB enrollment for the five years immediately preceding retirement. If you drop FEHB during that five-year window, you may lose the right to carry it into retirement unless an OPM exception or waiver applies.

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6. How much should I contribute to my TSP?‍

Contribute at least 5% of basic pay to capture the full government match. Anything less leaves free money on the table. According to the Federal Retirement Thrift Investment Board, consistent TSP contributions can significantly strengthen retirement income beyond the basic FERS annuity. The 2026 elective deferral limit is $24,500 for employees under age 50, with additional catch-up contributions available for older employees.

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