FERS Supplement Calculator
FERS Supplement Calculator
Estimates the FERS Special Retirement Supplement — the bridge payment that lets you draw a Social Security–style benefit between your federal retirement date and your 62nd birthday. Formula: Social Security benefit at 62 × (years of FERS service ÷ 40).
- SSA age-62 estimate
- $0
- FERS service factor
- 0/40
- Months you receive it
- 0
- Total over the bridge
- $0
This estimate uses OPM’s standard FERS Supplement formula and assumes you are eligible. Actual eligibility depends on your retirement type (MRA+30, voluntary early retirement, discretionary early retirement, special category, etc.). The Supplement is subject to the Social Security earnings test once you reach MRA: in 2025, every $2 of earned income above $23,400 reduces the annual Supplement by $1. The Supplement ends the month you turn 62 whether or not you actually claim Social Security at that age.
STONEBRIDGE CAPITAL MANAGEMENT • LITTLETON, COLORADO
You’ve earned a federal retirement worth understanding clearly. We help federal employees across the Denver metro area coordinate CSRS, FERS, TSP, FEHB, FEGLI, and Social Security into one clear retirement plan, so you can make confident decisions about when to retire, how your income will work, and how to protect the benefits you’ve earned.
How the FERS Supplement Calculator Works
Enter three pieces of information — your estimated Social Security benefit at age 62 (from your SSA statement at ssa.gov), your years of FERS creditable civilian service, and your age at retirement — and the calculator returns the monthly FERS Supplement you can expect to receive between your retirement date and your 62nd birthday. The formula is OPM\u2019s standard approximation: SSA-62 estimate × (years of FERS service ÷ 40).
The service factor caps at 40/40. If you have more than 40 years of FERS service, the factor stays at 1.0 — the Supplement does not grow beyond a 100% match of your SSA-62 estimate. Military service typically counts only if you made a military deposit (paid in to buy the service back). Part-time work counts based on actual hours worked, not calendar years.
The Supplement ends the month you turn 62. The total amount you receive over the bridge depends on how many months pass between your retirement date and your 62nd birthday. The calculator estimates this from the age you enter. Note that the Supplement does not have a Cost-of-Living Adjustment — the monthly amount stays flat for the entire bridge period.
This calculator is provided as an educational tool for federal employees in the Denver metro area and across the Colorado Front Range. For a complete projection that includes the earnings-test reduction, Social Security claiming strategy at 62, and coordination with your FERS pension and TSP withdrawals, request a personalized Federal Retirement Report.
What Your Supplement Estimate Means
The Supplement estimate is a planning target, not a guarantee. Three real-world factors will affect what you actually receive once the Supplement starts and over the years it continues.
The earnings test reduces the Supplement once you reach your MRA (minimum retirement age, currently 57 for most FERS employees). For every \u00242 of earned income above the Social Security limit (\u002423,400 in 2025), the annual Supplement reduces by \u00241. Earned income means wages or self-employment income — pension, TSP withdrawals, and investment income do not count toward the test. Many federal retirees take side work and unintentionally lose part of their Supplement.
Eligibility depends on retirement type. A standard MRA+30 voluntary retirement makes you immediately eligible for the Supplement. An MRA+10 reduced retirement does not — you can take it, but you give up the Supplement. Discretionary early retirement (DSR) and voluntary early retirement authority (VERA) provisions also have specific Supplement eligibility rules. We verify eligibility before counting on the Supplement in your retirement income plan.
The Supplement does not pay forever. It stops the month you turn 62. Once you reach 62, your Social Security claiming decision becomes its own question — and that decision interacts with your pension, your TSP, and your tax planning. For federal employees who want a broader overview of how all these pieces fit together, our Federal Retirement Workshop walks through every major federal benefit program in plain language, including the FERS Supplement and the Social Security claiming decision at age 62.
For a complete income projection that models the Supplement, the earnings test, Social Security claiming, and the rest of your federal retirement picture, request a personalized Federal Retirement Report. Learn more about our approach and what makes Stonebridge Capital Management different.
What You Get When You Work With Stonebridge
A Personalized Federal Retirement Roadmap
We bring together your pension, TSP, FEHB, FEGLI, survivor benefits, Social Security, and retirement timing into one coordinated retirement plan.
You’ll see where you stand today, the options available to you, your projected retirement income, and a retirement timeline you can move toward with confidence.
Plain-Language Guidance, Not Sales Pressure
Federal retirement is complicated enough without jargon, sales tactics, or manufactured urgency.
We explain your options clearly, answer your questions honestly, and help you understand the trade-offs before making decisions.
Decisions happen at your pace, not ours.
Colorado-Based Federal Retirement Specialists
Stonebridge is based in the Denver metro area and serves federal employees throughout Colorado’s Front Range.
Meet with us in person at our Inverness office or virtually from anywhere in Colorado.
When questions arise, you’ll have a local team you can reach, not a national call center.
Ready to see how the pieces fit together for your specific situation?
Other Federal Retirement Topics We Help With
The federal retirement decisions that drive lasting income are concentrated in a handful of benefit programs. Each has its own complexity, and each matters.
CSRS & FERS Pension Planning
Your federal pension is likely the foundation of your retirement income. Understanding when you can retire, how much income your pension may provide, and how survivor benefit elections affect your family can have a lasting impact on retirement.
We help you evaluate your retirement eligibility, project your pension under different retirement dates, and understand the trade-offs involved in retiring sooner or working longer.
Thrift Savings Plan (TSP) Strategy
For many federal employees, the TSP is their largest retirement asset. Decisions about investments, withdrawals, Roth conversions, and whether to leave funds in the TSP or move them to an IRA can have a significant impact on retirement income and taxes. We help you evaluate your options, understand the trade-offs, and coordinate your TSP strategy with your pension, Social Security, and overall retirement plan.
FEHB and Medicare Coordination
Your FEHB coverage may be one of the most valuable benefits you carry into retirement. Decisions about Medicare enrollment, which FEHB plan to keep, and how your coverage will work alongside Medicare can have a lasting impact on healthcare costs and coverage. We help you understand your options, evaluate the trade-offs, and make informed decisions about healthcare in retirement.
FEGLI Life Insurance Decisions
The life insurance decisions you make before retirement can have long-term consequences for both cost and coverage. As you age, certain FEGLI premiums can increase significantly, making it important to evaluate your options well before retirement. We help you understand your FEGLI elections, compare costs and benefits, and determine whether maintaining FEGLI, reducing coverage, or exploring private insurance alternatives may better support your family’s goals.
FERS Supplement
For eligible FERS retirees, the FERS Supplement can provide an important source of income between retirement and age 62. Understanding whether you qualify, how much you may receive, and how post-retirement earnings can affect the benefit is an important part of retirement planning. We help you evaluate how the FERS Supplement fits into your overall retirement income strategy and retirement timing decisions.
Survivor Benefit Plan
The survivor benefit election you make at retirement can affect both your retirement income and your spouse’s financial security for years to come. Because these decisions can be difficult or costly to change after retirement, they deserve careful consideration. We help you understand the costs, benefits, and trade-offs involved so you can make an informed decision based on your family’s needs and goals.
Social Security Timing for Federal Retirees
When to claim Social Security is one of the most important retirement income decisions you will make. Claiming earlier provides income sooner, while delaying can increase your monthly benefit for life. We help you evaluate your options and coordinate Social Security with your FERS pension and other income sources to create a retirement income strategy designed around your specific situation.
Frequently Asked Questions About the FERS Supplement
Who is eligible for the FERS Supplement?
The Supplement is available to FERS retirees who (1) retire before age 62 and (2) qualify for an immediate, unreduced FERS annuity.
The most common qualifying retirements are: MRA + 30 years of service, age 60 with 20 years of service (only if before age 62), and certain special category retirements (Law Enforcement Officers, Firefighters, Air Traffic Controllers, etc.). MRA + 10 reduced retirees, deferred retirees, and disability retirees generally do not receive the Supplement.
We confirm Supplement eligibility before counting on it in your retirement plan.
How long do I receive the FERS Supplement?
The Supplement ends the month you turn 62. That is a fixed cutoff — it doesn’t matter when you actually claim Social Security.
If you delay claiming Social Security to age 67 or 70, you’ll have a gap of five to eight years between the end of the Supplement and the start of your Social Security benefit. Planning for that gap is one of the most important pieces of any pre-62 retirement strategy.
What is the earnings test for the FERS Supplement?
Starting the year you reach your MRA, the FERS Supplement is subject to the same earnings test that applies to early Social Security. For every $2 you earn from wages or self-employment above the annual limit ($23,400 in 2025), your annual Supplement is reduced by $1.
Pension income, TSP withdrawals, Social Security, and investment income do NOT count toward the test — only earned income. Many federal retirees inadvertently lose part of their Supplement by taking post-retirement work. The earnings test is also retrospective: OPM doesn’t reduce your Supplement until they receive earnings data from the prior tax year.
Where do I find my Social Security age-62 estimate?
Create a free account at ssa.gov/myaccount. After verification, your Social Security statement shows your projected monthly benefit at three claiming ages: 62, your full retirement age (typically 67), and age 70. The age-62 estimate is the input you want for this calculator.
Note that the SSA estimate assumes you continue working until you claim — if you retire from federal service well before 62 with little to no post-retirement earnings, your actual age-62 SSA benefit may be slightly lower than the statement shows.
Does the FERS Supplement get a Cost-of-Living Adjustment?
No. Unlike your FERS pension and Social Security, the FERS Supplement does not receive an annual COLA. The monthly amount stays exactly the same from the day it starts until the day you turn 62.
Over a five-year Supplement period, this means the real (inflation-adjusted) value of the Supplement quietly erodes.
Will the FERS Supplement be eliminated in upcoming budget proposals?
The Supplement has been proposed for elimination in several federal budget cycles in recent years, including in 2018 and 2024 administration budgets. None of those proposals has been enacted into law. The Supplement is in current statute and is paid to all currently eligible retirees.
We track legislative developments and would flag any change that affects your retirement plan, but we don’t assume the Supplement is going away.
Is the FERS Supplement taxable?
Yes. The FERS Supplement is treated as ordinary federal taxable income (and Colorado state taxable income). Unlike Social Security, the Supplement is fully taxable from dollar one — there is no partial exclusion.
OPM does not automatically withhold federal income tax from the Supplement; you can opt into voluntary withholding using IRS Form W-4P. If you don’t withhold and have other taxable income (pension, TSP withdrawals), you may owe quarterly estimated taxes to avoid an underpayment penalty.
Serving Federal Employees Across The Colorado Front Range
Stonebridge is based in the Denver metro area and works with federal employees throughout Colorado’s Front Range.
Our clients serve in a wide range of federal agencies and organizations across the state, including the Denver Federal Center, VA Eastern Colorado Health Care System, Buckley Space Force Base, the Internal Revenue Service, the United States Mint, NREL, NOAA, NIST, and many others.
We meet with clients in person at our Inverness office and virtually throughout Colorado.
Primary Service Area
Denver · Littleton · Highlands Ranch · Centennial · Lakewood · Englewood · Parker · Castle Rock · Aurora · Arvada · Westminster · Broomfield · Thornton · Wheat Ridge · Golden · Lone Tree
Extended Service Area
Colorado Springs · Boulder · Fort Collins · Loveland · Greeley · Pueblo
Get Your Personalized Federal Retirement Report
The Federal Retirement Report is designed to help you understand where you stand today and what decisions may lie ahead. Built around your service history, benefits, and retirement goals, it provides a personalized analysis of your pension, TSP, healthcare benefits, survivor elections, retirement income, and other key planning considerations.
There is no cost and no obligation. It is simply a practical way to gain clarity before making important retirement decisions.
Related Federal Retirement Resources
Other calculators for federal employees:
- FERS Pension Calculator — estimate your federal annuity
- TSP Withdrawal Calculator — sustainable monthly withdrawals
- Retirement Income Calculator — combine your pension, TSP, and Social Security
Federal retirement planning by city — the same specialist work in your community:
For a broader overview of our approach, see our federal retirement planning hub.