Net Worth and FIRE: The Number That Means You Can Quit

FIRE — Financial Independence, Retire Early — is fundamentally a net worth conversation. The community has converged on a single number: 25 times your annual expenses, invested in a diversified portfolio, is enough to fund retirement indefinitely. Hit that number and you have the option to stop working. Here's how to think about it.

The 4% rule (and where 25× comes from)

The Trinity Study, updated repeatedly since 1998, found that a 4% annual withdrawal from a 50/50 or 60/40 portfolio has a very high probability of lasting 30+ years. 4% of your portfolio = your annual expenses → portfolio = 25 × expenses. Lower withdrawal rates (3.5% for 40+ year horizons, 3.25% for ultra-conservative) imply 28–30× as the target.

Your FIRE number = annual expenses × 25

• $40,000/year of expenses: FI = $1,000,000 (Lean FIRE)
• $60,000/year: FI = $1,500,000 (Regular FIRE)
• $100,000/year: FI = $2,500,000 (Comfortable FIRE)
• $150,000/year: FI = $3,750,000 (Fat FIRE)

Why net worth tracking is essential to FIRE

FIRE is the only major life decision where the trigger is a specific number, not a date or age. Without precise net worth tracking, you don't know when you've arrived. FIRE practitioners track monthly and project forward — the projected FI date is a powerful motivator.

Only count investable assets

Your FIRE number uses investable net worth — taxable brokerage, Roth, 401(k), IRA, and other liquid investments. Home equity doesn't count because you can't withdraw 4%/year from a house. Personal property doesn't count. The number is sometimes 60–70% of total net worth, not 100%.

Variants of FIRE

Coast FIRE: enough invested early that compound growth alone reaches FI by traditional retirement age, with no further contributions needed. Barista FIRE: enough to cover most expenses; a low-stress part-time job covers the rest and health insurance. Lean FIRE: minimal lifestyle. Fat FIRE: comfortable to luxurious. All use the same 25× framework with different expense numbers.

What FIRE actually means

FI is the option to stop working. Many people who reach it don't retire; they shift to passion projects, part-time work, or consulting. The freedom is what matters: the ability to choose your work, your hours, and your conditions because money is no longer the constraint.