Fat FIRE

What Is It

Fat FIRE means retiring on a notably higher annual budget than typical — there’s no official cutoff, but it generally means maintaining or even increasing your current lifestyle rather than trimming it down. The mechanics are identical to standard FIRE: expenses times 25. The only difference is which expense number you’re plugging in.

Why It Matters

This is the opposite tradeoff from Lean FIRE. Instead of trading margin for speed, Fat FIRE trades speed for margin: it takes longer to reach a bigger number, but once you’re there, you’ve got real cushion for the unexpected and no need to fundamentally downgrade your life to make retirement work. It tends to appeal to higher earners who could retire lean much sooner, but would rather work longer and keep the lifestyle they’ve already built.

Quick Example

Using the same $50,000-expenses baseline from earlier in this series, the standard FIRE number is $1,250,000. Someone pursuing Fat FIRE at $150,000 a year needs $3,750,000 instead — exactly three times the spending, exactly three times the target. Same formula, same multiplier, dramatically different timeline.

Try It Yourself

A bigger number means a longer runway and more exposure to market swings along the way — worth stress-testing against real historical scenarios, not just the flat formula.

Related Concepts