What's the best book about early retirement?
In one paragraph
The Simple Path to Wealth by JL Collins. Collins retired in his 50s and wrote the book around the actual mechanics of getting there — savings rate as the single most important variable, index funds as the vehicle, and the safe-withdrawal math that makes it work.
What this actually means
Early retirement is fundamentally a savings-rate problem. At a 10% savings rate, you'll work 50+ years. At 50%, roughly 17 years. At 70%, under 9 years. That sliding scale, plus the math behind it, is the core of Simple Path to Wealth.
Collins's book is the most-recommended single read in the FIRE community for a reason — it's specific. VTSAX, hold it, save aggressively, retire when 25× your annual expenses is invested. The chapters on the 4% rule walk through what actually works for someone retiring at 50 vs 65 vs 35.
Your Money or Your Life is the older philosophical complement. Robin and Dominguez wrote about financial independence in 1992, before 'FIRE' was a term. The 'life energy' reframe — every dollar is hours of your life traded — is the most influential single idea in the early-retirement movement, even when the specific tactics (long-term Treasuries) no longer apply.
The Next Millionaire Next Door provides the behavioral evidence — Sarah Stanley Fallaw's data shows that early retirees aren't outliers; they're middle-income people who maintained 30%+ savings rates for 15-25 years.
Skip books promising early retirement through real estate flipping, online businesses, or 'passive income' courses. The boring index-fund + high-savings-rate path is the one that actually works.