Retiring at 55 requires solving three financial puzzles simultaneously: having enough invested, accessing it before traditional retirement age, and covering healthcare for 10 years before Medicare. Each is solvable — all three together require serious planning.
The 55-year-old FIRE number
Retiring at 55 with a 35-year retirement: the 4% rule becomes somewhat riskier over very long periods. Many early retirees use 3.5% to account for sequence-of-returns risk over 35 years.
| Annual spending | At 4% withdrawal | At 3.5% withdrawal |
|---|---|---|
| $50,000 | $1,250,000 | $1,428,571 |
| $75,000 | $1,875,000 | $2,142,857 |
| $100,000 | $2,500,000 | $2,857,143 |
The Rule of 55: penalty-free 401(k) access
If you leave your employer in the year you turn 55 (or older), you can take distributions from that employer's 401(k) without the 10% early withdrawal penalty. Key: must be from the 401(k) of the employer you're leaving that year (not old 401(k)s or IRAs). This is the most underused early retirement provision.
Healthcare: the most expensive planning puzzle
Medicare begins at 65. A healthy 55-year-old couple retiring early needs health insurance for 10 years. Options: ACA marketplace (potentially subsidized if income is managed), COBRA from last employer (expensive, 18 months max), spouse's employer plan if spouse keeps working. ACA subsidies phase out above 400% FPL ($60,240 for single, $81,760 for couple in 2026) — managing income via Roth conversions can preserve eligibility.
Social Security at 55 vs waiting
Social Security starts no earlier than 62 (with permanent reduction). At 55, you have 7 years minimum before earliest SS claiming. Planning for a 10-year income gap before SS is essential. Most financial plans delay SS to 67 or 70 to maximize lifetime benefits — especially important since you may live to 90+.
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