One of the most common (and most unpleasant) surprises in retirement isn’t the paperwork. It’s the moment you realize your paycheck and your retirement income aren’t the same thing.
Imagine a long-tenured federal employee who retires with a high-3 salary of $100,000. Under the Federal Employees Retirement System (FERS), the basic pension formula is generally 1% × high-3 × years of service (or 1.1% if you retire at age 62+ with at least 20 years). That means even with 30 years of service, the pension is often in the neighborhood of 30%–33% of high-3 pay before taxes and any optional reductions.
If that retiree delays Social Security, and their withdrawals from savings are modest (or they’re hesitant to withdraw at all), there can be a real “in-between” period where the math doesn’t match the lifestyle. For FERS retirees who leave service before 62 with an immediate, unreduced annuity, the FERS annuity supplement may soften that gap until age 62; however, it ends at 62, is subject to an earnings test, and does not receive cost-of-living adjustments. Social Security, on average, replaces about 40% of annual pre-retirement earnings, and it was never designed to be the only source of retirement income.
That difference between what you used to live on and what your benefits deliver at first is what we mean by the retirement income gap. For federal employees, this gap is often manageable, but it takes intentional planning.
Your Last Paycheck vs. Your First Retirement Deposit
Example based on a federal employee (FERS) with 30 years of service and a $100,000 high-3 salary
This illustration uses simplified estimates for educational purposes only. It does not include the FERS annuity supplement, which may reduce the gap before age 62 for eligible retirees, and it does not fully reflect plan-specific tax treatment or benefit elections. Actual figures may vary based on individual circumstances. Consult a qualified financial professional before making retirement decisions.
What retirement income is made of for federal employees
Federal retirement planning is sometimes described as a “three-legged stool”: a pension, Social Security, and the Thrift Savings Plan (TSP). It’s a helpful mental model, but it can also create a false sense of simplicity—because each leg turns on at different times and behaves differently.
The pension is formula-driven. Under FERS, the computation is based on years of creditable service and your high-3 average salary, using the 1% (or 1.1%) rules described by the U.S. Office of Personnel Management (often shortened to OPM).
Social Security is timing-driven. You can start as early as 62, but claiming before full retirement age permanently reduces benefits. Delaying beyond full retirement age increases the benefit up to age 70, as explained by the Social Security Administration.
The TSP is balance-driven. The TSP is a defined contribution plan, meaning the income it can provide depends on your contributions, investment results, and withdrawal choices.
The Three Legs of Federal Retirement Income
Each source works differently, pays out on its own schedule, and carries its own set of trade-offs. Tap any leg to learn more.
Calculated using your years of service and highest 3-year average salary. Predictable, but typically covers only about 30% of pre-retirement pay.
You choose when to claim, from age 62 to 70. Claiming earlier means a smaller monthly benefit. Waiting could mean a larger one. When you start matters.
Your TSP balance depends on how much you contributed, how those funds performed, and how you choose to withdraw. This leg is the most flexible and the most variable.
This visual is for educational purposes only and does not represent a guarantee of any specific benefit amount or outcome. Actual results depend on individual circumstances. Consult a qualified professional before making retirement decisions.
Where the gap actually comes from
When people hear “income gap,” they usually think only about the pension being smaller than a salary. That’s part of it, but federal retirees often run into several other gap-creators that shrink retirement spending power.
Pension reality: great foundation, not full replacement. With the FERS 1% multiplier, 30 years tends to translate to about 30% of high-3 pay (or ~33% with the 1.1% factor at 62+ with 20+ years).
Timing gaps: bridge years and benefit ramp-ups. Many employees retire before 62 and delay Social Security for a larger monthly benefit. The consequence is a planned gap that must be filled from somewhere else.
For certain FERS retirees who retire before 62 with an immediate (unreduced) annuity, the annuity supplement can help bridge to age 62; however, it ends at 62, is subject to an earnings test, and (per OPM’s handbook) it does not receive cost-of-living adjustments.
Inflation and COLA rules. Many, if not most, FERS retirees do not receive COLAs on the basic annuity until age 62 (with exceptions such as disability, survivors, and certain special provisions). And when COLAs do apply under FERS, the adjustment can be capped when inflation is high (for example, if CPI rises more than 3%, the FERS COLA is 1% less than CPI).
Tax and Medicare premium surprises. Federal annuities are generally taxable, with part treated as tax-free recovery of employee contributions and the remainder taxable. Social Security benefits may also be taxable depending on the combined income thresholds the Internal Revenue Service publishes. And once Medicare begins, higher income can trigger IRMAA surcharges on Part B and Part D premiums; the Centers for Medicare & Medicaid Services publishes the annual premium and surcharge schedule.
Penalties and special rules can change the cost equation. For example, Medicare has late enrollment penalties in many situations; Medicare.gov explains how the Part B penalty is calculated and that it can last as long as you have Part B.
Healthcare costs don’t stand still. Even outside the federal system, one benchmark is Fidelity Investments’ estimate that a 65-year-old individual retiring in 2025 may need about $172,500 in after-tax savings for healthcare costs in retirement; Fidelity notes that this estimate does not include long-term care, most dental services, or over-the-counter medications.¹
For federal retirees, FEHB can be a major advantage, but costs still require planning, and Medicare coordination can change which coverage pays first and what you pay out of pocket.
What Actually Creates the Income Gap?
It's rarely one thing. Four factors tend to quietly chip away at retirement spending power.
With the FERS 1% multiplier, 30 years of service typically translates to about 30% of your high-3 salary (or roughly 33% if you retire at 62+ with 20 or more years).
That's a reliable check every month, but it leaves a significant portion of your former income uncovered. The pension was designed to be one piece of the puzzle, not the whole picture.
Many federal employees retire before 62 and choose to delay Social Security for a larger monthly benefit. That creates a stretch of years where the pension carries most of the weight alone.
The FERS annuity supplement may help bridge to 62 for eligible retirees, but it ends at 62, is subject to an earnings test, and does not receive cost-of-living adjustments.
Federal annuities are generally taxable. Social Security benefits may also be partially taxable depending on combined income thresholds published by the IRS.
Higher income in retirement can trigger IRMAA surcharges on Medicare Part B and Part D premiums. Pension payouts, TSP withdrawals, and Social Security can all interact to push you into higher brackets or surcharge tiers.
FEHB is a major advantage for federal retirees, but premiums still come out of a smaller income. Once Medicare begins, coordinating coverage between FEHB and Medicare can change what you pay out of pocket.
One widely cited benchmark from Fidelity Investments estimates that a 65-year-old retiring in 2025 may need about $172,500 in after-tax savings for healthcare costs in retirement, and that figure does not include long-term care.
This content is for educational purposes only and does not constitute a guarantee of any specific outcome. Individual situations vary. Consult a qualified financial professional before making decisions.
A beginner-friendly framework to close the gap
Most retirement income gaps come from retiring without a clear income map. The good news: you don’t need a 200-page binder to get clarity. You need a one-page plan that answers, “What pays us, when, and how much after taxes?”
Start with your spending baseline. Track your current expenses long enough to separate “must-pay” costs (housing, utilities, food, insurance) from “nice-to-have” spending. The goal is a realistic monthly number, not perfection.
If you’re still working and you’ve identified room in the budget, one of the most straightforward ways to shrink a future income gap is simply saving more—especially while you’re still eligible for agency matching. Contribution limits matter here: the IRS publishes the annual elective deferral limit for workplace plans (and the TSP’s employee contribution limit follows those annual IRS limits). For 2026, the basic elective deferral limit is $24,500. If you’re age 50 or older, the regular catch-up contribution limit is $8,000, and SECURE 2.0 provides a higher catch-up limit for ages 60–63 ($11,250 for 2026).²
Then estimate your “steady” income. For many FERS employees, that begins with the OPM pension computation rules and a Social Security estimate at different claiming ages.
Decide how you’ll handle the bridge years. If you retire before claiming Social Security, choose what fills that gap. If you qualify for the FERS annuity supplement, it may help, but remember the key features: it ends at 62, it’s subject to an earnings test, and it doesn’t get COLAs.
Build a withdrawal plan for your TSP (and other savings). After separating, current TSP withdrawal options generally include partial distributions, installment payments, and annuity purchases, and installment payments can be structured in different ways.
A sustainable-withdrawal guideline many people have heard of is the “4% rule,” originally studied using historical data; research by William Bengen is among the foundational sources for that concept.
It’s not a promise, and it’s not universal, as your “right” withdrawal approach depends on your pension income, flexibility, and market conditions. A key risk to plan around is sequence-of-returns risk: withdrawing during a down market early in retirement can permanently reduce lifetime spending power, a point emphasized in Vanguard research.
Finally, check the tax picture. Pension and TSP withdrawals can increase taxable income, make more of Social Security taxable, and raise Medicare premiums through IRMAA. RMD rules matter too: the IRS explains when they begin, and SECURE 2.0 changed several items (including elimination of lifetime RMDs for designated Roth accounts in employer plans starting in 2024).
Your Retirement Timeline at a Glance
Choose your planned retirement age and Social Security claiming age to see how your key milestones line up.
This timeline is an educational illustration only and does not account for every individual situation. The annuity supplement, COLA rules, tax implications, and withdrawal strategies may vary. Consult a qualified financial professional before making decisions.
Common missteps that widen the gap
Most income gaps don’t come from one catastrophic decision. They come from a handful of understandable assumptions.
Treating the pension as “the plan.” Under FERS, the formula itself shows why the pension is designed as a base, not a full paycheck replacement on its own.
Leaving matching dollars on the table. For many FERS employees, agency matching on employee contributions follows a published formula (dollar-for-dollar on the first 3% and 50 cents on the next 2%, tied to the first 5% of pay you contribute).
Making Social Security a reflex instead of a strategy. The SSA’s rules are clear: early claiming reduces your monthly benefit; delayed claiming increases it up to age 70.
Ignoring inflation and COLA details. The combination of “no COLA until 62 for many FERS retirees” plus the capped FERS COLA formula can create a real purchasing-power issue in early retirement years.
Letting taxes and Medicare premiums surprise you. IRS thresholds for Social Security taxation and CMS schedules for Medicare premiums and IRMAA are published rules—meaning you can often plan around them by coordinating withdrawal timing and income sources.
Forgetting which benefits have “keep it” rules. FEHB continuation generally requires meeting the five-year requirement and retiring on an immediate annuity, and FEGLI continuation generally requires the five-year/all-opportunity rule. Those are checklist items to confirm well in advance.
One more “small decision, big consequence” item: survivor benefits. Beyond the income protection angle, survivor elections can affect healthcare continuity for a spouse. OPM notes that a surviving spouse can continue FEHB coverage if there is a monthly survivor benefit (or a Basic Employee Death Benefit) payable and the retiree was enrolled in a Self and Family or Self Plus One plan at the time of death.
How G&R Financial Solutions helps you turn benefits into an income plan
G&R Financial Solutions is a wealth management and financial planning firm based in New Jersey. Our work with federal employees isn’t about hype or market predictions—it’s about building a clear retirement income plan around the rules, the numbers, and the trade-offs you control.
A planning conversation typically focuses on questions like: Where are your true bridge years, and what fills them? How should your withdrawal strategy coordinate with Social Security timing? What does your after-tax “retirement paycheck” look like, and how sensitive is it to inflation, market declines, and healthcare costs? Are you positioned to keep critical benefits (like FEHB) and make informed survivor elections?
If you’d like help building (or pressure-testing) your retirement income map, schedule a consultation with our team.
