Federal Employees Retirement System (FERS)

If you work for the federal government you hold something almost nobody in the private sector still has: a real pension, stacked on top of Social Security and a 401(k)-equivalent with the cheapest fund menu in the country. FERS replaced the Civil Service Retirement System in 1987 and rests on three tiers, and the reason to understand all three is that they vest, index, and pay out on different schedules — so the retirement date that maximizes one can shortchange another.

Social Security Tier

Federal employees pay standard FERS payroll contributions and 6.2% Social Security taxes, accumulating credits toward full Social Security benefits.

Thrift Savings Plan (TSP)

The federal equivalent of a 401(k), sharing the same contribution limits and catch-up rules under IRC §402(g) and IRC §414(v), and carrying expense ratios low enough to embarrass most private plans. The agency contribution comes in three pieces: an automatic 1% whether or not you contribute, then a dollar-for-dollar match on your first 3%, then 50 cents on the dollar on the next 2%. Contribute 5% and the agency adds 5% — a 100% return, immediately, on the only money in your financial life that will ever offer one. Contribute less than 5% and you are declining part of your salary.

Basic Benefits Plan (FERS Annuity)

A defined-benefit pension funded by mandatory employee contributions (ranging from 0.8% to 4.4% depending on hire date) and government funding, guaranteeing a lifetime monthly pension.

Thrift Savings Plan Fund Optimization

The Thrift Savings Plan (TSP) offers a curated, low-cost selection of index funds:

G Fund

The Government Securities Investment Fund is unique to the TSP. It invests in short-term Treasury securities but is legally guaranteed to yield interest at the average yield of all outstanding Treasury bonds with maturities of four years or more. This delivers long-term bond yields with zero volatility and zero principal risk.

F Fund

Tracks the Bloomberg U.S. Aggregate Bond Index, offering broad investment-grade debt exposure.

C Fund

Tracks the S&P 500 Index, representing large-cap U.S. equities.

S Fund

Tracks the Dow Jones U.S. Completion Total Stock Market Index, capturing mid- and small-cap U.S. equities.

I Fund

Tracks the MSCI ACWI IMI ex USA ex China ex Hong Kong Index. Read that name carefully — the fund moved off the MSCI EAFE benchmark in a transition completed in October 2024, which widened coverage of non-US markets from roughly 55% to 90% by adding emerging markets and small caps, while excluding Chinese and Hong Kong equities outright. If you hold the I Fund and want China exposure, you now have to source it elsewhere.

L Funds

Lifecycle Funds that operate as Target-Date Funds, automatically shifting assets from equities to debt as you near your target retirement date.

FERS Annuity Mechanics

The FERS basic annuity is calculated using a statutory formula:

High-3 Average Salary

The average of your highest three consecutive years of basic pay.

Years of Creditable Service

The total active years of federal service, plus accrued sick leave.

Multiplier

The standard pension multiplier is 1.0% per year of service. If you retire at age 62 or older with 20 or more years of service, the multiplier increases to 1.1%, generating a permanent 10% pension boost.

For example, a federal professional retiring at age 62 with 30 years of creditable service and a High-3 salary of $150,000 secures an annual pension of:

This pension is paid monthly for life and is adjusted annually for inflation via Cost of Living Adjustments (COLAs) starting at age 62.

Social Security Fairness Act & FERS Bridges The legacy Windfall Elimination Provision (WEP) and Government Pension Offset (GPO) rules historically slashed Social Security benefits for retirees receiving pensions from employment not covered by Social Security (such as old CSRS). Because FERS employees contribute to Social Security throughout their careers, they were never subject to these reductions. Furthermore, the Social Security Fairness Act, signed January 5, 2025, repealed both provisions, protecting affected public servants. If you retire at your Minimum Retirement Age (MRA) with 30 years of service, or at age 60 with 20 years of service, you are eligible for the FERS Special Retirement Supplement. This supplement acts as a bridge, paying an amount that estimates your future Social Security benefit earned during federal service, lasting until you reach age 62.