FIRE: How Much Do You Actually Need to Retire Early?
The 4% rule says multiply your annual expenses by 25. But is that really enough?
Financial Independence, Retire Early (FIRE) has one core formula: save 25x your annual expenses, withdraw 4% per year, and your money lasts 30+ years. But the details matter more than the formula.
The Numbers
$30,000/year expenses = $750,000 needed. $50,000 = $1,250,000. $75,000 = $1,875,000. $100,000 = $2,500,000. The single biggest lever is not income — it is expenses. Cutting $500/month from spending reduces your FIRE number by $150,000.
The 4% Rule Holds Up (Mostly)
The Trinity Study showed a 4% withdrawal rate survived 96% of 30-year periods historically. For 40-50 year retirements (early retirees), dropping to 3.5% or 3.25% adds significant safety margin. Or simply: be flexible and reduce spending slightly in down markets.
The Savings Rate Is Everything
Savings rate 10%: retire in ~40 years. 25%: ~30 years. 50%: ~15 years. 70%: ~8 years. Every dollar you do not spend does double duty: it is one less dollar you need in retirement AND one more dollar invested getting you there.
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