Sep 14, 2026 · 49 min
Five FIRE milestones turn retirement math into a personal target
The 5 Levels of FIRE (Coast, Lean, FI, Chubby, Fat)
The episode frames financial independence as a series of attainable milestones, while showing how spending, withdrawal rates, and lifestyle choices shape the finish line.
- 1Coast FIRE offers an early milestone where existing investments can grow toward future independence without continued contributions.
- 2The 25x spending rule and withdrawal-rate assumptions provide the investment math behind traditional, Chubby, and Fat FIRE targets.
- 3A personal FIRE number should reflect actual lifestyle choices rather than an ever-moving definition of financial freedom.
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The clearest conceptual shift comes when Coast FIRE is presented as the first taste of financial freedom, before full retirement.
The brief
Andrew maps financial independence across five levels—Coast, Lean, traditional FI, Chubby, and Fat—using spending needs and investment growth to distinguish them.
The episode’s central argument is that Coast FIRE deserves attention as the first meaningful milestone: investments may grow toward future independence without further contributions.
The framework relies on the 25x spending rule and withdrawal-rate research associated with Bill Bengen and the Trinity study, turning lifestyle choices into portfolio targets.
The practical tension is psychological as much as mathematical: a FIRE number can clarify the path, but constantly raising it can keep financial freedom permanently out of reach.