Withdrawal Strategy Comparison
How the 4% Rule, Guyton-Klinger, VPW, and CAPE-based strategies compare, historical success rates, income stability, and best use cases for FIRE retirees.
Strategy Overview
| Strategy | Income Stability | 30yr Success | 40yr Success | Best For |
|---|---|---|---|---|
| 4% Rule (fixed + inflation) | High | ~95% | ~85% | Traditional retirement, predictable income needed |
| 3.5% Rule (fixed + inflation) | Moderate | ~99% | ~95% | Early retirees, balance of stability and safety |
| Guyton-Klinger Guardrails | Variable | ~98% | ~92% | Flexible spenders, mathematically cannot fail |
| Variable Percentage Withdrawal | Moderate | 100% | 100% | Market-aware retirees, CAPE followers |
Source: FIRE Statistics Database, based on Trinity Study, Bengen (1994), Guyton-Klinger (2006), Kitces (2014)
How Each Strategy Works
4% Rule (Fixed + Inflation)
Withdraw 4% of your initial portfolio in year one, then adjust that dollar amount for inflation each year. Formula: Year 1 withdrawal = Balance × 4%. Year N withdrawal = Year 1 withdrawal × (1 + inflation)^(N-1).
Pros: Simple, predictable income. Cons: Doesn't adapt to market conditions. Source: Bengen (1994), Trinity Study (1998).
Guyton-Klinger Guardrails
Start with 4-5% withdrawal. After each year, adjust: if portfolio gained >20% of initial value, increase withdrawal by 10%. If portfolio dropped >20%, decrease by 10%. Otherwise, adjust for inflation.
Pros: Adapts to markets while smoothing income. Cons: Requires discipline to cut spending. Source: Guyton & Klinger (2006).
Variable Percentage Withdrawal (VPW)
Each year, withdraw a fixed percentage of your current portfolio balance based on your age and asset allocation. The percentage increases as you age (since your horizon shortens). Mathematically cannot fail, you never go to zero because you always withdraw a fraction of what remains.
Pros: Impossible to run out of money. Cons: Income varies with markets, can drop significantly after bad years. Source: Bogleheads community.
CAPE-Based Dynamic Withdrawal
Use the Shiller CAPE (Cyclically Adjusted Price-to-Earnings ratio) to set your initial withdrawal rate. When CAPE is high (expensive market), use a lower rate (~1/CAPE). When CAPE is low, use a higher rate. Recalculate each year based on remaining horizon.
Pros: Market-aware, historically strong safety. Cons: Requires monitoring CAPE. Source: Kitces (2014), modified for current CAPE ~40 (2026).
Historical Crisis Performance
How a $1,000,000 portfolio with $40,000/year withdrawal would have fared through the worst historical periods:
| Crisis | Years | 4% Rule | Guyton-Klinger | VPW |
|---|---|---|---|---|
| Great Depression | 1929-1943 | $342,000 | $415,000 | $480,000 |
| 1973 Oil Crisis | 1973-1987 | $628,000 | $710,000 | $805,000 |
| Dot-com + GFC | 2000-2014 | $187,000 | $340,000 | $520,000 |
Source: S&P 500 Historical Returns database. Simulations assume 60/40 portfolio.
Which Strategy Should You Choose?
- If you want predictable income: 4% Rule, simplicity and stability
- If you're retiring early (40-50 yr horizon): Guyton-Klinger, adapts to markets, good safety
- If you have flexible spending: VPW, mathematically safe, maximizes spending
- If you follow market valuations: CAPE-based, most responsive to conditions
Try our Withdrawal Strategy Comparator to run your own numbers, or explore the FIRE Data & Datasets for the underlying data.