What is a safe withdrawal rate for early retirement (40+ years)?
For retirements lasting 40+ years, research suggests 3.25–3.5% is safer than the traditional 4%. A $2M portfolio at 3.5% provides $70,000/year. With dynamic spending (cutting 10–15% in down markets), you can safely withdraw 4–4.5% even over 50 years.
Formula
Conservative: Portfolio × 0.035. Flexible: Portfolio × 0.04 with 10-15% spending cuts in down markets.
Example
$2.5M at 3.5% = $87,500/year. With guardrails: start at $100k (4%), reduce to $87.5k if portfolio drops below $2M, increase to $112.5k if it exceeds $3M.
How it works in detail
The original 4% rule was tested for 30-year periods. Early retirees at 35–45 face 45–60 year retirements — significantly longer. Wade Pfau's research shows the safe withdrawal rate drops to roughly 3.25% for 50-year periods with a fixed strategy. However, most early retirees have spending flexibility. Variable Percentage Withdrawal (VPW), guardrails strategies (Guyton-Klinger), or simple 'cut spending 10% if portfolio drops 20%' rules restore the safe rate to 4%+ because you're adapting to market conditions.
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How much do I need to retire?
Multiply your annual spending by 25. If you spend $60,000/year, you need $1,500,000. This is the 4% rule from the Trinity Study (1998) — withdraw 4% annually with a 95%+ historical success rate over 30 years.
What is the 4% rule for retirement?
The 4% rule says you can withdraw 4% of your portfolio in year one of retirement, adjust for inflation each year, and have a 95%+ probability your money lasts 30 years. It comes from William Bengen's 1994 research, later confirmed by the Trinity Study (1998).
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