Why 4% might be too aggressive for early retirement
Trinity Study assumed 30 years. FIRE retirees plan for 40–60. Bengen and Kitces updated research suggests 3.25–3.5% for very long horizons. Difference: a $1M portfolio supports $40K at 4% vs. $32.5K at 3.25% — significant lifestyle impact.
Sequence-of-returns risk
Two retirees with identical 30-year average returns can have wildly different outcomes if one hits a bear market in years 1–5. Mitigation: 2-year cash buffer + flexible withdrawal (cut 10% in down years) + part-time income optional in first 5 years.
Healthcare bridge to Medicare
FIRE before 65 means buying ACA marketplace insurance. ACA subsidies cliff hard above 4× FPL (~$60K MAGI for single). Keep MAGI just under to get $0 premium silver plans — a huge subsidy that radically changes FIRE math.
FAQ
What savings rate do I need to FIRE in 15 years?
Roughly 50%+ of gross income with 7% returns. The relationship is non-linear: 25% savings = ~32 years; 50% savings = ~17 years; 70% savings = ~9 years.
Does Social Security factor in?
Plan without it for the first 25 years if your FIRE date is before 50. SSA benefits supplement after age 62/67 but aren't reliable for sub-40-year-old planners.
Should I count home equity?
Generally no — your home is consumption, not income-producing. Some FIRE planners use 'BAREST FI' (financial independence based on liquid assets only) as a stricter benchmark.
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Written by Sam Doshi and the RevenueLab editorial team. We don't sell the data feeds this tool is built on.
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Last reviewed
June 2026. We re-check every figure on the platform on a rolling quarterly cycle.
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See our editorial policy and disclaimer. Results are estimates, not advice.