Federal Employee FIRE: Financial Independence and Early Retirement with FERS

How your pension, supplement bridge, and FEHB coverage change the FIRE math — often by over $1 million. Not financial advice; your specific numbers matter.

Most FIRE advice is built around one principle: accumulate 25× annual expenses in investable assets, then retire. That framework was designed for private-sector workers who have no guaranteed income until Social Security at 62–70 and face $1,500–$2,500/month in individual health insurance premiums between retirement and Medicare.

Federal employees under FERS have a fundamentally different problem. By the time you reach your Minimum Retirement Age (MRA) with 20–30 years of service, you have three structural advantages that private-sector FIRE planners don't:

1. FERS annuity — a guaranteed income floor for life, reducing the portfolio you need to accumulate
2. FERS Special Retirement Supplement — a bridge from your MRA to age 62 that functions like early Social Security
3. FEHB in retirement — the same government-subsidized health insurance you have now, not $1,500/month ACA marketplace premiums

Together, these three advantages can reduce the TSP balance you need for early retirement by $1 million or more compared to a private-sector peer targeting the same income. This guide shows you how to calculate your federal FIRE number, which service milestones matter most, and what traps to avoid.

The federal FIRE number: income-gap method

The standard 4% rule says you need 25× your annual expenses in a portfolio. For federal employees, the calculation is different: you need 25× only the income your FERS benefits don't cover.

Step by step:

1. Choose your target annual gross income in retirement
2. Estimate your FERS annuity (1.0% × years of service × high-3 salary)
3. Estimate your FERS supplement if retiring before 62 (estimated SS at 62 × FERS years ÷ 40)
4. Subtract both from your target income: this is your TSP gap
5. Divide TSP gap by your safe withdrawal rate (3.5–4%) to get your portfolio target

Using a GS-14 example:

Assumes FERS annuity = $43,500/yr and FERS supplement = $18,000/yr (30 yrs service, $145K high-3, estimated SS $24K at 62). Private-sector peer has no pension or supplement.

The FERS advantage in these examples stays roughly $1.54 million regardless of income target — that's the present-value equivalent of the $61,500/year in guaranteed pre-62 income your FERS benefits provide (at a 4% rate: $61,500 ÷ 4% = $1,537,500).

FIRE paths by service milestone

Not all federal FIRE paths are equal. Your options depend on your age, years of service, and whether your agency is offering a VERA. Here are the main paths:

The service milestone math: Each additional year of service adds 1.0% × high-3 to your annuity. At a $145,000 high-3, that's $1,450/year in guaranteed income — equivalent to $36,250 in TSP at a 4% SWR. Staying one more year in federal service often returns more than that year's salary contributes to your savings, because of the pension multiplier and FERS supplement eligibility threshold.

The FERS supplement: your bridge to Social Security

The FERS Special Retirement Supplement is one of the least understood and most valuable parts of a federal early retirement. It's a monthly payment equal to:¹

Estimated Social Security benefit at 62 × (FERS years of service ÷ 40)

With 30 years of service, you receive 75% of your estimated SS benefit — paid monthly starting at your retirement date (for MRA+30 and 60+20 retirements). With 20 years, you receive 50%.

Two rules that matter for FIRE planning:

• Earnings test. In 2026, if you earn more than $24,480 from post-retirement work, the supplement is reduced $1 for every $2 over the threshold.¹ A $50,000 consulting engagement reduces your supplement by $12,760/year. If post-retirement work is part of your FIRE plan, model this carefully.
• The supplement stops at 62 regardless of when you file for Social Security. If you delay SS to 67 or 70, there is a gap between when the supplement ends and when SS begins. During that window, your TSP must cover the income shortfall. Plan the phase transition — the Social Security Timing Calculator shows the break-even math for FERS employees.

TSP Rule of 55: the penalty-free bridge

For federal employees retiring before 59½, the TSP has a critical advantage over an IRA: the Rule of 55.

If you separate from federal service in the calendar year you turn 55 (or later), you can take withdrawals from your TSP without the 10% early withdrawal penalty. No 72(t) SEPP elections required, no complex scheduling. For LEO, firefighters, and air traffic controllers, the age is 50.²

The Rule of 55 trap: This exception applies to your TSP directly — it does not transfer to an IRA if you roll your TSP out before age 59½. Once you roll TSP funds to a traditional IRA, those funds are subject to the standard 10% penalty on withdrawals before 59½ (unless you use SEPP/72(t), which is restrictive and irrevocable).

The implication for federal FIRE: if you retire between ages 55 and 59, keep your TSP in the TSP for penalty-free income access. Don't roll to an IRA to chase broader investment options until after 59½. You can still roll selectively at 59½ while keeping some funds in TSP to preserve the G Fund or other TSP advantages.

GS-14 worked example: FIRE at 57 with 30 years

Parameters: GS-14, born 1969 (MRA = 57), 30 years of FERS service, high-3 salary = $145,000, TSP balance at retirement = $850,000 traditional (plus $120K Roth TSP from Roth conversion window), FEHB self+1 enrolled continuously for 7 years, no post-retirement employment planned.

FEHB: ~$9,600/year employee share for self+1 mid-range plan (government covers ~72% of premium).

Estimated federal income tax: ~$13,500 (FERS annuity partially excluded via IRS Simplified Method; supplement and TSP fully taxable; no payroll taxes on annuity).

Net after-tax, after-FEHB income: ~$72,400/year — equivalent lifestyle to ~$115,000+ in gross pre-retirement income when accounting for lower effective tax rate, elimination of FERS contributions (0.8–4.4% of salary), no commuting costs, and no payroll taxes on annuity income.

TSP balance trajectory: Higher withdrawals from 62–67 (to cover the supplement gap) partially offset by Roth TSP growth and the shift to a more conservative withdrawal rate post-67 when SS begins. At $850K initial, this balance sustains the income plan across scenarios with reasonable longevity assumptions.

Private-sector peer comparison: A colleague retiring the same year from a private company with no pension targeting the same $95,500 gross income needs $95,500 ÷ 4% = $2,387,500 in portfolio — $1.54 million more than this federal employee.

Five federal FIRE requirements you cannot miss

1. FEHB 5-year continuous enrollment rule. You must have been continuously enrolled in FEHB for the 5 years immediately before your retirement date (or since your first opportunity, if less than 5 years).³ Employees who plan to retire early but have gaps in FEHB enrollment — or who are considering waiving FEHB while on a spouse's plan — risk losing FEHB in retirement permanently. If you're 2 years short, staying until the rule is met is almost always worth it.
2. 20-year service threshold for FERS supplement. The supplement requires 20+ years of creditable service and retirement at or after your MRA. MRA+10 retirees (MRA with 10–19 years) do not receive the supplement. If you're close to 20 years, that threshold changes your FIRE number substantially.
3. TSP Rule of 55 requires keeping TSP in the TSP. Rolling TSP to an IRA before 59½ destroys the Rule of 55 penalty exception for those funds. Keep your traditional TSP in the TSP until at least 59½ if you need pre-59½ income.
4. The supplement earnings test affects post-retirement income plans. If you plan to consult, freelance, or work part-time after retiring, earnings above $24,480 in 2026 reduce your supplement $1 for every $2 over the limit.¹ Model this in your cash flow plan.
5. OPM retirement date rules affect the first year cash flow. Retiring on the last day of a month (for FERS) means your annuity starts the first of the following month. OPM pays interim pay (60–80% of estimated annuity) while processing your full claim — which can take 50–100+ days. Plan a cash reserve of 2–3 months of expenses to bridge the interim period without drawing heavily on TSP.

Federal FIRE for LEO, firefighters, and ATC

Federal law enforcement officers, firefighters, and air traffic controllers operate under the most FIRE-favorable rules in the federal government. Under 5 U.S.C. § 8412(d)–(e), these employees can retire at age 50 with 20 years of service (or at any age with 25 years in a covered position), with:⁴

• An enhanced annuity formula: 1.7% × first 20 years + 1.0% × additional years
• FERS supplement starting on the retirement date (not deferred to MRA)
• TSP Rule of 55 extended to age 50
• No FERS supplement earnings test until age 62

A GS-equivalent CBP officer retiring at 50 with 20 years of covered service at $115,000 high-3 earns: 1.7% × 20 × $115,000 = $39,100/year — plus a supplement of roughly $19,320/year. Combined guaranteed income of ~$58,420/year before any TSP withdrawals. Federal FIRE at 50 is realistic and achievable in this category with disciplined TSP contributions starting early in a career.

Building your FIRE plan: key decisions

Roth conversion window (ages 57–62). The early retirement period before Social Security and before RMDs is the lowest-income window of your life. TSP and annuity income may fall in the 12–22% bracket, making targeted Roth conversions attractive. Converting traditional TSP to Roth now reduces future RMD exposure and creates tax-free income in later decades. See the FERS Roth Conversion Strategy guide for the bracket math.

Military buyback. Prior military service can be purchased at 3% of military base pay, adding years to your FERS service credit. Adding one year might push you from 29 to 30 years, crossing the MRA+30 threshold and eliminating the MRA+10 penalty — or from 19 to 20 years, unlocking the FERS supplement. Calculate your break-even with the Military Buyback Calculator.

Sick leave conversion. Unused sick leave converts to additional FERS service credit at 174 hours per month (full months only). This doesn't affect eligibility thresholds, but it does increase your annuity. Use it to optimize, not as the primary lever. See the Sick Leave Calculator.

High-3 timing. Your annuity is locked to the 3-year average — every year of higher salary increases it permanently. A promotion or step increase in the 36 months before retirement has an outsized return: every $1,000 increase in high-3 is worth $300/year in annuity for life (at 30 years). At a 4% SWR, that's $7,500 in TSP equivalence. See the High-3 Calculator for timing scenarios.

Sources

1. OPM — FERS Special Retirement Supplement: eligibility (MRA+30, 60+20, VERA), calculation formula (SS×FERS_years÷40), 2026 earnings test ($24,480), supplement stops at 62.
2. TSP — Tax Information: Rule of 55 (separation in calendar year of 55th birthday or later); Rule of 50 for law enforcement, firefighters, and ATC; penalty applies to IRA rollovers, not TSP-direct withdrawals.
3. OPM — FEHB Enrollment in Retirement: 5-year continuous enrollment requirement, government contribution rates (2026: up to $20,229 self+family, $18,490 self+1), FEHB continues in retirement at same government-share ratio.
4. 5 U.S.C. § 8412 — Immediate Retirement: special category (LEO, firefighter, ATC) eligibility at age 50+20 or any+25, MRA+30 and 60+20 eligibility for regular FERS, MRA table by birth year.
5. IRS — Retirement Topics: Exceptions to Tax on Early Distributions: Rule of 55 qualified plan exception (not applicable to IRA), SEPP/72(t) as alternative for IRA holders.

Annuity calculations, supplement estimates, and TSP projections in this guide are illustrative. Actual benefits depend on your specific grade, locality pay area, retirement tier, exact service history, and OPM determination. FERS rules and dollar thresholds reflect 2026 guidance. Values verified July 2026.