Fat FIRE is a variant of FIRE (Financial Independence, Retire Early) achieved on a generous, comfortable annual budget rather than a frugal one. Because target spending is high, it requires a much larger portfolio, so it usually takes longer or a higher income to reach. Fat FIRE lets you retire early without significantly cutting back on lifestyle — travel, housing and discretionary spending stay at or above average.
Worked example
You want to live on $120,000 a year and use the 4% safe withdrawal rate. The portfolio needed is 120,000 ÷ 0.04 = $3,000,000, equivalent to 120,000 × 25. That is roughly five times a Lean FIRE target built on $25,000 of annual spending.
Why it matters
Fat FIRE matters because it shows financial independence need not mean austerity: with a large enough portfolio you can retire early and keep a full lifestyle and ample cushion against inflation or emergencies. The common pitfall is the sheer size of the target — chasing an ever-higher "fat" number can delay retirement for years, so it is worth defining "enough" rather than treating the goal as open-ended.
Frequently asked questions
There is no fixed figure, but Fat FIRE generally implies annual spending well above average, so portfolios often run into the millions. Multiply your desired annual spending by about 25 (the inverse of a 4% withdrawal rate) for a rough target.
It depends on your priorities. Fat FIRE buys comfort and a larger safety margin but takes far longer to fund; Lean FIRE frees your time sooner at the cost of a tighter budget.