The federal employees retirement system fers is a three-tiered retirement plan covering most U.S. civilian federal workers hired since 1984. According to the U.S. Office of Personnel Management (OPM), FERS covered roughly 2.7 million active employees and more than 2.6 million retirees and survivors as of fiscal year 2023.
Many federal workers reach mid-career without understanding how their annuity, Social Security, and Thrift Savings Plan fit together — and that gap costs real money at retirement. This guide breaks down the five most important facts you need to know, with actionable steps to verify your own federal employees retirement system fers benefits today.
What Is the Federal Employees Retirement System FERS?
The federal employees retirement system fers combines three income sources into one retirement package: a basic annuity, Social Security benefits, and the Thrift Savings Plan (TSP). You pay into FERS through payroll deductions each pay period. The basic annuity uses your highest three consecutive years of salary (your "high-3") and your length of creditable service to calculate your monthly benefit.
The current employee contribution rate depends on when you were first hired. Employees first hired before January 1, 2013, generally contribute 0.8% of basic pay. Those hired in 2013 contribute 3.1%, and employees hired on or after January 1, 2014, contribute 4.4%, according to OPM's published FERS contribution tables.
Your agency also makes a matching contribution, though that amount goes to fund the overall annuity pool rather than an individual account.
A common scenario: a GS-12 employee with 25 years of service earning a high-3 of $95,000 would receive an annual annuity of approximately $23,750 before reductions — 25 years multiplied by 1% of the high-3.
The federal employees retirement system fers formula shifts to 1.1% per year if you retire at age 62 or older with at least 20 years of service.
How to apply this: Log into your Employee Personal Page and verify your service computation date is correct, since an error of even one year directly changes your annuity.
FERS Eligibility: When Can You Actually Retire?
The federal employees retirement system fers sets specific minimum retirement age (MRA) rules that depend on your birth year. Your MRA ranges from 55 to 57 — workers born in 1970 or later have an MRA of 57. OPM publishes the full MRA table in its FERS handbook, which remains the authoritative source for determining your personal threshold.
There are three main retirement paths under the federal employees retirement system fers. Immediate retirement is available at your MRA with at least 30 years of service, or at age 60 with 20 years, or at age 62 with 5 years.
Early retirement (MRA+10) lets you leave at your MRA with at least 10 years of service, but your annuity is permanently reduced by 5% for each year you are under age 62. Deferred retirement lets you leave before eligibility and claim a reduced annuity later.
One case worth noting: a federal employee who leaves at age 50 with 15 years of service and defers retirement until age 62 avoids the MRA+10 reduction entirely and still receives their earned annuity. The trade-off is losing federal health benefits coverage during the deferral period.
How to apply this: Write down your birth year, look up your MRA on the OPM website, and calculate whether you hit the 30-year or 20-year service mark before that age.
The Thrift Savings Plan: Your Most Powerful FERS Tool
Within the federal employees retirement system fers, the TSP functions like a private-sector 401(k) — and it is where the government gives you free money through matching. OPM and the Federal Retirement Thrift Investment Board report that the TSP held over $800 billion in assets across more than 6.9 million participant accounts as of late 2023.
The matching formula is specific. The government automatically contributes 1% of your basic pay regardless of your own contributions. On top of that, the agency matches dollar-for-dollar on your first 3% of contributions and 50 cents per dollar on your next 2%.
That means contributing 5% of your salary earns you the full 5% agency match — a 100% return on your contribution before any investment gains.
Failing to contribute at least 5% means you are leaving part of your compensation package unused. Surveys from federal benefits educators consistently show that a meaningful share of newer federal employees contribute below the full match threshold, often because they do not understand how the federal employees retirement system fers matching formula works.
How to apply this: Log into TSP.gov and check your current contribution percentage. If it is below 5%, increase it immediately — even 1% more captures additional matching dollars.
FERS Annuity Calculation: The High-3 Formula Explained
The federal employees retirement system fers calculates your basic annuity using a straightforward formula: 1% of your high-3 average salary multiplied by your years and months of creditable service. Your high-3 is the highest average basic pay you earned during any three consecutive years of federal service, typically your final three years.
The 1% multiplier increases to 1.1% if you retire at age 62 or later with at least 20 years of service. That difference — 0.1% per year of service — may sound small, but it compounds across a 30-year career.
On a $100,000 high-3 with 30 years of service, retiring at 62 yields an annual annuity of $33,000 versus $30,000 at the standard 1% rate — a $3,000 annual difference for life.
| Retirement Scenario | Years of Service | Multiplier | Annual Annuity on $100,000 High-3 |
|---|---|---|---|
| Under age 62 | 30 | 1.0% | $30,000 |
| Age 62+ | 30 | 1.1% | $33,000 |
| Age 62+ | 20 | 1.1% | $22,000 |
| MRA+10 (age 57, reduced) | 25 | 1.0% minus 25% | $18,750 |
Unused sick leave converts to additional service credit at retirement. Every 174 hours of unused sick leave adds one month of creditable service under the federal employees retirement system fers, which slightly increases your annuity.
How to apply this: Request your most recent annual benefits statement from your agency HR office and verify your service credit calculation matches your own records.
Survivor Benefits and Cost-of-Living Adjustments
The federal employees retirement system fers includes survivor benefit options that reduce your annuity but protect your spouse. Choosing a full survivor benefit (50% of your annuity) reduces your own annuity by 10%. A partial survivor benefit (25% of your annuity) reduces your annuity by 5%.
Cost-of-living adjustments (COLAs) under FERS are less generous than the old Civil Service Retirement System. FERS COLAs apply only if you retire at age 62 or older, and they are capped: if inflation exceeds 3%, your COLA is inflation minus 1 percentage point. For inflation at 2% or below, you receive the full COLA.
The Social Security Administration's annual COLA announcement determines the base figure.
A practical example: if the Social Security COLA is 3.2%, FERS retirees receive a 2.2% adjustment. If inflation is 5%, federal employees retirement system fers retirees receive 4%. This cap means your purchasing power erodes faster than it would under full inflation protection — an important consideration when planning long-term income needs.
How to apply this: Discuss survivor benefit election with your spouse before retirement, and model your post-retirement income at a 2% annual inflation assumption rather than the full inflation rate.
Frequently Asked Questions About federal employees retirement system fers
Can I retire under FERS and continue working part-time?
Yes, you can retire under the federal employees retirement system fers and work part-time in the private sector without affecting your annuity. However, if you return to federal service as a reemployed annuitant, your salary is typically reduced by your annuity amount.
The offset rules get complex when you work for a FERS-covered agency again, so check with OPM before accepting reemployment.
What happens to my FERS contributions if I leave federal service before retirement?
You can request a refund of your contributions, but doing so permanently forfeits your right to a future annuity. A more common scenario is leaving your contributions in place and filing for deferred retirement later.
If you take the refund, you lose all service credit and must repay the amount plus interest to restore it if you return to federal service.
If you leave before retirement, you may request a refund of your federal employees retirement system fers contributions, but you forfeit any future annuity permanently.
How does military service affect my FERS annuity?
Military service can be credited toward your federal employees retirement system fers annuity if you make a deposit covering the service period plus interest. Without a deposit, the military time does not count toward your annuity calculation. The deposit amount equals a percentage of your military base pay and must be paid before retirement to receive credit.
Does FERS include health insurance in retirement?
FERS itself does not include health insurance, but you can keep your Federal Employees Health Benefits (FEHB) coverage into retirement if you were enrolled for the five years immediately before retiring and you retire on an immediate annuity. Deferred retirees lose FEHB eligibility until their annuity begins, and MRA+10 retirees face the same restriction.
Note that the federal employees retirement system fers itself does not include health insurance, though FEHB coverage can continue if you meet the five-year enrollment rule.
What is the FERS supplement and who qualifies for it?
The FERS annuity supplement approximates the Social Security benefit you earned during federal service and is paid to eligible employees who retire before age 62. You qualify if you retire on an immediate annuity before age 62 with at least 20 years of service, or at your MRA with 30 years.
The supplement stops at age 62 regardless of whether you actually file for Social Security.
Conclusion
The federal employees retirement system fers rewards employees who understand its mechanics and act early.
- Your FERS annuity depends on your high-3 salary, years of service, and whether you retire at 62 or later.
- Contributing at least 5% to your TSP captures the full government match — leaving it on the table is a direct pay cut.
- Survivor benefit elections and COLA caps shape your federal employees retirement system fers income for decades, so plan both carefully.
- Verify your service computation date and contribution rate now, because errors compound over time.
Your next step is simple: open your most recent benefits statement and your TSP account in two browser tabs. Check your contribution percentage, your service date, and your projected annuity side by side. If anything looks off, contact your agency HR specialist this week — the earlier you correct an error, the more it is worth.
