How to Retire Early: The FIRE Method Explained

FIRE stands for Financial Independence, Retire Early. It's not about being rich — it's about reaching a number where your investments generate enough passive income to cover your expenses forever. Some people do it by 40. Others by 50. The math is surprisingly simple.

The FIRE Number: How Much Do You Need?

Your FIRE number = annual expenses × 25. This comes from the '4% rule': if you withdraw 4% of your portfolio per year, your money will last 30+ years in almost all historical scenarios.

• Spend $40,000/year → need $1,000,000 to retire
• Spend $50,000/year → need $1,250,000
• Spend $60,000/year → need $1,500,000
• Spend $80,000/year → need $2,000,000

The Key Variable: Your Savings Rate

How fast you reach FIRE depends almost entirely on your savings rate — what percentage of your income you save and invest. At 10% savings rate, you'll work ~43 years. At 50%, about 17 years. At 70%, about 8.5 years.

Types of FIRE

• LeanFIRE: Retire on $25,000–$40,000/year. Frugal lifestyle, smaller number to reach.
• FatFIRE: Retire on $80,000–$100,000+/year. Comfortable lifestyle, bigger number.
• BaristaFIRE: Semi-retire with part-time work covering some expenses.
• CoastFIRE: Save enough early that you can stop contributing and coast to traditional retirement.

How to Reach FIRE Faster

1. 1Increase income — the most powerful lever. Raises, side income, career moves.
2. 2Reduce big expenses — housing and transportation are 50%+ of most budgets
3. 3Invest in low-cost index funds — don't let fees eat your returns
4. 4Avoid lifestyle inflation — when income rises, save the extra instead of spending it
5. 5Optimize taxes — max 401(k), Roth IRA, and HSA before investing in taxable accounts