The three pillars of FERS

What are the three pillars of FERS?

The three pillars of FERS are the FERS pension annuity paid by the federal government, the Thrift Savings Plan that you fund and invest, and Social Security. Together they make up retirement income for federal employees hired under the Federal Employees Retirement System. Some retirees see a fourth, shorter pillar. That fourth pillar is the Special Retirement Supplement, which bridges the gap from retirement to age 62.

Do all federal employees get all three pillars?

Most federal employees hired after 1983 are under FERS and earn all three pillars. Earlier hires may be under CSRS, which is a single larger pension with no Social Security or agency TSP match. CSRS-Offset employees fall in between, with a partial Social Security component. Check the retirement-coverage code on your SF-50 form (the Notification of Personnel Action that records each change to your federal employment) if you are not sure which system you are in. Three codes to know:

• Code K: FERS (the standard system for hires after 1983).
• Code A: CSRS (the older system, mostly closed since 1984).
• Code C: CSRS-Offset (a hybrid for employees who returned to federal service after a break).

Why did Congress replace CSRS with FERS?

Congress replaced CSRS with FERS in 1987 to spread risk across multiple income sources and make federal benefits more portable. A single large pension is expensive for the employer to maintain. It also ties workers to their agency, because leaving means walking away from the accrued benefit. FERS shifted part of the cost to a market-based account, the TSP. It also added Social Security. Federal employees could now move in and out of federal service without losing everything they had built. The change brought federal retirement closer to the private-sector norm.

What happens if one of the three pillars weakens?

Each pillar has a different repair because each pillar has a different risk. A pension benefit cut for future hires does not affect you if you are already retired. A market crash that hits your TSP is recoverable if you still have years to work. Even if you do not, income from the pension and Social Security can carry you while the market recovers. A Social Security reform usually grandfathers existing retirees. Knowing which pillar is at risk lets you target the right hedge.

Which pillar should I focus on first as a new federal employee?

The TSP, specifically the agency match. The pension formula and Social Security benefit you automatically. The TSP only grows if you contribute. Contributing less than 5 percent of your salary leaves part of the agency match on the table forever, with no later catch-up. Once you are capturing the full match, the rest of the Early Career track helps you build the foundation for optimization decisions later on.

What is the FERS pension formula in plain English?

For most employees the annual pension equals your High-3 average salary times 1 percent times your years of creditable service. Retiring at age 62 or later with at least 20 years of service uses 1.1 percent instead, a roughly 10 percent boost. Special-provision groups use richer multipliers. Law enforcement, firefighting, and air-traffic-control retirees typically earn 1.7 percent for the first 20 years and 1.0 percent after that. The Mid Career track has a full lesson on estimating your own pension from your pay records.

When do I become eligible to start receiving the pension?

Eligibility is set by age and years of service together. You can retire at age 62 with 5 years of service, at age 60 with 20 years, or at your Minimum Retirement Age with 30 years. The MRA+10 path lets you retire at your MRA with 10 years at a reduced amount. Your MRA is 55 to 57 depending on your birth year. The Mid Career track has a lesson dedicated to each eligibility route and the trade-offs between them.

Is the FERS pension safe?

The FERS pension is a defined-benefit promise backed by the federal government. It is funded through a dedicated trust fund, and the formula is set by law. Current and retired employees have strong legal protections around accrued benefits. A benefit-formula change generally cannot reduce what you have already earned. FERS trust-fund solvency is sound for the foreseeable future, unlike Social Security, which faces its own funding questions. The pension is not market-dependent, which is what makes it the most predictable of the three pillars.

What is the diet COLA, and why does it matter over a long retirement?

The "diet COLA" is the rule that reduces your FERS pension cost-of-living adjustment when inflation runs above 2 percent. In low-inflation years your pension increases by the full CPI. In moderate-inflation years (CPI 2 to 3 percent) the COLA is capped at 2 percent. In high-inflation years the COLA equals CPI minus 1 percent. Over a 25-year retirement the gap can erode purchasing power by 10 percent or more. The diet COLA is why the pension cannot be your only inflation hedge.

What happens to my pension when I die?

By default the pension stops the month you die. If you elected a survivor benefit at retirement, your spouse receives 25 or 50 percent of your unreduced pension. That payment continues for the rest of their life. The election reduces your pension by 5 or 10 percent during your lifetime in exchange for the survivor coverage. It is one of the most consequential one-time decisions you make at retirement. The Mid Career lesson on survivor benefits covers it in detail.

How is the TSP different from a private 401(k)?

The TSP works very similarly to a 401(k): pre-tax or Roth contributions, an agency match, and investment options you choose. Three differences stand out:

• Extremely low fees, a fraction of typical private-sector rates.
• A much smaller, deliberately curated menu of funds.
• Direct integration with federal payroll, so changes apply on the next pay period.

What if I cannot contribute the full 5 percent right now?

Contribute whatever you can, then raise the rate as your pay grows. Even a 2 or 3 percent contribution starts capturing part of the agency match and begins compounding. Many federal employees set an automatic increase every January so the rate climbs without a separate decision each year. The goal is to reach 5 percent quickly enough that the full match is no longer being left behind.

Can I take my TSP balance with me if I leave federal service?

Yes. The TSP balance is yours. If you separate, you have three choices. You can leave the money in the TSP, roll it into another retirement account, or take a distribution. The usual tax rules apply to a distribution. The pension and Social Security work differently, but the TSP is fully portable. That portability is one of the design choices that made FERS more flexible than CSRS.

When am I vested in the agency match?

You are immediately vested in your own contributions and in the agency match (the dollar-for-dollar and 50-cents portions). The automatic 1 percent agency contribution requires three years of federal service to vest. If you leave federal service before three years, the 1 percent automatic contribution stays with the government. Your own contributions and the matched portion go with you regardless.

What does each TSP fund actually hold?

The TSP offers five core funds plus the Lifecycle (L) funds. Each core fund tracks a single, broad asset class:

• G fund: special-issue Treasury securities; principal never drops.
• F fund: the U.S. bond market.
• C fund: the S&P 500 (large U.S. companies).
• S fund: the broader U.S. stock market beyond the S&P 500 (small and mid-cap companies).
• I fund: developed-market international stocks.
• L funds: glide-path mixes of all five core funds, shifting more conservative as the target year approaches.

When can I claim Social Security as a federal retiree?

Age 62 is the earliest. Your full retirement age is 66 or 67 depending on your birth year. Each year you delay past full retirement age raises the benefit by about 8 percent, up to age 70. The right claiming age depends on your other income, your health, and your spouse. The Late Career track has a lesson devoted to the trade-off.

Does my FERS pension reduce my Social Security?

No. FERS employees pay into Social Security on every paycheck and earn the standard benefit. You may have heard about the Windfall Elimination Provision (WEP) and the Government Pension Offset (GPO). Those reductions applied to CSRS employees whose work was not covered by Social Security. The Social Security Fairness Act of 2025 ended those offsets for the federal retirees who were still affected.

What is the SRS, and how does it relate to Social Security?

The Special Retirement Supplement is a separate bridge payment. It is paid by OPM, not by the Social Security Administration. The supplement approximates the Social Security benefit you have earned through your federal service. It pays that estimate from the day you retire until you turn 62. After 62 it stops, and you can claim Social Security itself. We cover the SRS in detail in the next slide and in the Late Career track.

How is my Social Security benefit actually calculated?

The Social Security Administration indexes each year of your earnings for wage inflation. It picks the 35 highest indexed years and averages them. That average is your Average Indexed Monthly Earnings. The agency then runs the average through a progressive formula with "bend points." Lower lifetime earners receive a higher replacement rate than higher earners, by design. You can pull your earnings record and an updated benefit estimate from your account at ssa.gov. The estimate updates each year as new earnings are reported.

Can I work after I start collecting Social Security?

Yes, with one caveat. If you claim before your full retirement age and keep working, the Social Security earnings test applies. It temporarily reduces your benefit when your wages exceed an annual threshold. The withheld amount is added back later in higher monthly payments. The test is a deferral, not a permanent loss. Once you reach your full retirement age, the earnings test no longer applies. You can earn any amount without affecting your benefit.

Who qualifies for the SRS?

You generally qualify if you retire under immediate, unreduced FERS rules before age 62. That includes retiring at your Minimum Retirement Age with 30 or more years of service. It also includes retiring at age 60 with at least 20 years. MRA+10 retirees and deferred retirees do not qualify. Special-provision employees in law enforcement, firefighter, and air-traffic-controller positions have their own SRS rules.

Does the SRS continue past age 62?

No. The supplement ends the month you turn 62, whether or not you actually file for Social Security. It is a bridge, not a permanent benefit. The Late Career track lesson on the SRS covers timing and the earnings test that can reduce the supplement if you work after retiring.

How is the SRS calculated?

OPM approximates the Social Security benefit you would have earned from federal service alone. It then prorates that estimate by your years of FERS service divided by 40. The result is a monthly payment that is roughly proportional to a federal career, not your full Social Security record. The exact formula is documented in the calculator assumptions and on the SRS glossary page.

Does the SRS have an earnings test like Social Security?

Yes. If you earn wages above an annual threshold after retirement, your SRS is reduced by $1 for every $2 of earnings over the limit. The threshold mirrors the Social Security earnings test for under-FRA claimants and adjusts each year. The reduction is permanent during the months it applies, unlike the Social Security version which is recovered later. The Late Career lesson on the SRS earnings test covers the math and the planning implications in detail.

Which pillar of FERS ends up the largest?

For most career federal employees the TSP ends up the largest of the three pillars. Contributions plus the agency match compound for decades. The pension and Social Security each typically cover a quarter to a third of pre-retirement income. Your own mix depends on your salary, your savings rate, and how long you stay in federal service.

What happens if one pillar falls short?

A short pillar is a planning signal, not a failure. If your TSP is small, the readiness checklist points to raising your contribution rate or delaying retirement. If your Social Security claim age is too early, the same checklist suggests delaying it. A later claim locks in a larger lifetime benefit. The three pillars together leave room to adjust whichever one is weakest without redoing the whole plan.

Where should I start as an early-career federal employee?

Capture the full 5 percent TSP match first. That single move secures the largest guaranteed return available to you. From there, work through the rest of the Early Career track in order. Each lesson builds the foundation for the optimization decisions you will make later, when the trade-offs get more specific.

How does the income mix change over a long retirement?

It changes more than most people expect. A 57-year-old retiree may see only the pension and the SRS. At 62, the SRS stops and Social Security becomes available. The TSP withdrawal rate may need to rise if the other two pillars do not keep pace with inflation. The FERS pension has a diet COLA, and the TSP depends on market performance. Many planners split the early years (57 to 65) from the later years (65 plus). The Mid and Late Career lessons cover that split in detail.