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.