How Does FERS Retirement Work? What Federal Employees Need to Know About TSP

How Is the FERS Pension Calculated?

The FERS basic pension formula:

- Under 62 at retirement (or 62+ with less than 20 years): 1% × high-3 average salary × years of service - 62 or older with 20+ years: 1.1% × high-3 average salary × years of service

High-3 = average of your highest 3 consecutive years of basic pay (usually your final 3 years).

Example: 30 years of service, high-3 of $120,000, retiring at 62 = 1.1% × $120,000 × 30 = $39,600/year ($3,300/month).

FERS includes a COLA, though it's slightly less generous than the full CPI: if CPI is 2% or less, FERS gets the full CPI. If CPI is 2-3%, FERS gets CPI minus 0.5%. If CPI exceeds 3%, FERS gets CPI minus 1%. Still better than most private pensions which have no COLA at all.

Why Is the TSP So Valuable and How Should You Use It?

The Thrift Savings Plan is the federal government's 401(k) equivalent with two major advantages: extremely low fees (0.043% expense ratio in 2024 — approximately 1/30th of typical mutual fund fees) and a generous match (5% with full match on the first 5% of pay).

The 5% match is structured as: 1% automatic (whether you contribute or not) + dollar-for-dollar on the first 3% + 50 cents on the dollar on the next 2%.

TSP fund options: L funds (lifecycle/target-date), C fund (S&P 500), S fund (small/mid cap), I fund (international), F fund (bonds), G fund (government securities). The G fund is unique — it guarantees no loss of principal while earning intermediate-term bond returns.

The TSP Roth option (added 2012) allows after-tax contributions. For federal employees in lower brackets early in their career, Roth TSP contributions can be extremely valuable given the decades of tax-free growth.

How Do the Three FERS Components Work Together?

FERS was designed as a 'three-legged stool' — and when analyzed together, it's often more generous than people realize.

Example (30-year employee, high-3 $120,000, retiring at 62): - FERS pension: $39,600/year ($3,300/month), COLA-adjusted - Social Security (estimated): $30,000-36,000/year at FRA - TSP (5% contribution + 5% match over 30 years at 7% return): approximately $950,000-1,100,000

Combined: $70,000-75,000/year guaranteed income + $1M+ TSP portfolio. That's a retirement income replacement rate of 60-65% from guaranteed sources alone, before touching TSP.

The analysis engine models all three components — pension with COLA, Social Security with optimal claiming, and TSP withdrawal sequencing — to show the complete picture.

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