4% Rule vs Variable Percentage Withdrawal
Your withdrawal strategy determines whether your money outlasts you — or you outlast your money. The 4% Rule and Variable Percentage Withdrawal (VPW) represent two philosophies.
Quick Comparison
| Dimension | 4% Rule | VPW |
|---|---|---|
| Approach | Static — fixed % of initial portfolio | Dynamic — % of current portfolio |
| Income predictability | High — same real income every year | Low — varies with market |
| Portfolio survival | ~95% over 30 years | 100% (by design) |
| Risk of running out | Small but real | Zero |
| Risk of underspending | Moderate | Zero (you always spend available) |
| Inflation adjustment | Yes (CPI-adjusted annually) | Implicit (spending what's there) |
| Best for | Those who value predictable income | Those who can flex spending |
The 4% Rule: Simple and Predictable
Rooted in the Trinity Study, the 4% Rule says: Year 1: withdraw 4% of your starting portfolio. Every year after: adjust that dollar amount for inflation, regardless of market performance.
Pros: You always know your income. Simple to execute. Cons: In a bad sequence of returns — see 4% rule updates — you can run out. In great markets, you might under-spend.
VPW: Flexible and Safe
Each year, withdraw a percentage based on your age and current portfolio balance. The percentage increases as you age.
Pros: You can never run out of money. You spend more in good years. Cons: Income fluctuates. In a 30% market drop, your withdrawal drops 30%.
Real-World Example: $1M Portfolio
| Year | Market Return | 4% Rule Income | VPW Income |
|---|---|---|---|
| 1 | N/A | $40,000 | $48,000 (4.8% at 65) |
| 2 | -20% crash | $40,800 (+2% CPI) | $38,400 (-20%) |
| 3 | +25% recovery | $41,616 | $48,000 |
| 10 | Mixed | $47,000 (with inflation) | Varies with portfolio |
Which Should You Choose?
- 4% Rule if you want predictable income and can live with small failure risk.
- VPW if you have flexible spending (can cut 30% in bad years) and want zero failure risk.
- Hybrid: Use 4% Rule for essential expenses and VPW for discretionary spending. Model your hybrid approach with our withdrawal strategy comparator.