25x Rule — How Much You Need for Financial Independence
The 25x rule of expenses in the FIRE movement. How to calculate the amount needed to achieve financial independence and where this rule comes from.
What is the 25x Rule?
The 25x rule is a simple rule of thumb used in the FIRE (Financial Independence, Retire Early) movement: to achieve financial independence, you need an investment portfolio worth 25 times your annual expenses.
Where does it come from?
The 25x rule is the inverse of the 4% rule (Safe Withdrawal Rate). If you can safely withdraw 4% of your portfolio annually, then 1 ÷ 0.04 = 25. Hence the multiplier.
The foundation is the Trinity Study (1998) — research by Trinity University professors who analyzed historical U.S. market data and showed that a portfolio of stocks and bonds survived 30 years with 4% annual withdrawals in over 95% of scenarios.
How does it work in practice?
Formula
Target amount = Annual expenses × 25
Example
You spend 7,000 PLN monthly (84,000 PLN annually):
84,000 × 25 = 2,100,000 PLN
After reaching this amount in your investment portfolio, you can (theoretically) live off withdrawals without depleting your capital.
Multiplier variants
Not everyone needs to use exactly 25x:
| Multiplier | SWR | Safety level |
|---|---|---|
| 20x | 5.0% | Risky — for short horizon |
| 25x | 4.0% | Standard — 30 years |
| 28x | 3.5% | Conservative — 40+ years |
| 33x | 3.0% | Very safe — ultra-long horizon |
If you're planning FIRE at age 35 and need your portfolio for 50+ years, consider a 28-33x multiplier instead of the standard 25x.
Limitations of the 25x rule
- Doesn't account for taxes — In Poland, the 19% Belka tax reduces the effective withdrawal rate
- Assumes constant expenses — In reality, expenses change over time
- Based on historical data — Future returns may be lower
- Doesn't include ZUS/pensions — Polish retirement benefits reduce the required amount
How Freenance can help
Freenance calculates your FIRE number based on actual expenses — no need to guess. The calculator accounts for inflation, taxes, and your individual income sources, giving you a more precise result than the simple 25x rule.
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