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FIRE by ageFat FIRE: how much you need
Fat FIRE is financial independence on a generous budget, usually $100,000 a year or more. At 4% that takes $2,500,000; for an early retirement of 40 years, Morningstar's 3.3% rate raises it to $3,030,303.
Portfolio by spending
| Spending a year | 4% rule | 3.3% (40 years) | 2.9% (50 years) |
|---|---|---|---|
| $100,000 | $2,500,000 | $3,030,303 | $3,448,276 |
| $150,000 | $3,750,000 | $4,545,455 | $5,172,414 |
| $200,000 | $5,000,000 | $6,060,606 | $6,896,552 |
| $250,000 | $6,250,000 | $7,575,758 | $8,620,690 |
How long it takes
Years to reach a $2,500,000 target from nothing, at 5% a year after inflation:
| Saving a year | Years | Starting at 30, done at |
|---|---|---|
| $50,000 | 25.7 | 55.7 |
| $75,000 | 20.1 | 50.1 |
| $100,000 | 16.6 | 46.6 |
| $150,000 | 12.4 | 42.4 |
What fat FIRE has to cover
A bigger budget usually means more of what grows faster than average inflation: private health insurance until 65, travel, help for children or parents. Taxes on withdrawals also rise with income, so a fat FIRE budget should include them.
Fat FIRE by retirement age
The earlier you stop, the longer the money must last and the lower the starting rate. Portfolio needed for $150,000 a year:
| Retire at | Length to plan for | Starting rate | Portfolio needed |
|---|---|---|---|
| 45 | 50 years | 2.9% | $5,172,414 |
| 55 | 40 years | 3.3% | $4,545,455 |
| 65 | 30 years | 3.9% | $3,846,154 |
The saving it takes
Yearly saving needed to reach the 40-year target by 50, starting from nothing at 30 and earning 5% a year after inflation:
| Spending a year | Target at 50 | Saving a year for 20 years |
|---|---|---|
| $100,000 | $3,030,303 | $91,644 |
| $150,000 | $4,545,455 | $137,466 |
| $200,000 | $6,060,606 | $183,288 |
Fat FIRE is mostly a high-income path: saving $91,644 a year takes an income well into six figures. Starting with money already invested shortens it a lot; the FIRE calculator shows how much.
Questions people ask
How much is considered fat FIRE?
There is no official line; people often use $100,000 a year or more of spending, which takes $2,500,000 at 4%. $150,000 a year takes $3,750,000.
How much money to fat FIRE?
Your yearly spending divided by your withdrawal rate. For $120,000 a year: $3,000,000 at 4%, $3,636,364 at 3.3%.
Related
Lean, regular, fat, coast and barista FIRE compares all five for one household. The FIRE calculator has a fat FIRE setting.
Sources
- Amy C. Arnott, "How Much Can You Safely Withdraw If You Retire Early?", Morningstar, September 15, 2026 (data as of September 30, 2025).
- William P. Bengen, "Determining Withdrawal Rates Using Historical Data", Journal of Financial Planning, October 1994.
Keep reading
- Coast FIRE: how much you need by age
What coast FIRE means and the amount you need at 25, 30, 35, 40 and 45.
- Net worth by age in 2025: what the Fed's new survey shows
Median and average net worth by age from the Federal Reserve's 2025 survey, and what changed since 2022.
- How much do you need to retire at 40?
The portfolio you need by spending level for a 50-year retirement, what it takes to save it and how to bridge to 59½.
- Safe withdrawal rate by retirement length
Starting withdrawal rates for 30 to 50-year retirements, what they assume and what they mean for your portfolio.
- What is FIRE? Financial independence in numbers
What financial independence means, the five versions and how much each one costs.
Last reviewed by Asier Fernández, editor, on . Educational information only, not financial advice. How we calculate