What Is the 4% Rule? The Foundation of Retirement Planning
The 4% rule is the cornerstone of modern retirement planning. It states that you can withdraw 4% of your portfolio in the first year of retirement, then adjust that amount for inflation each year, and your money should last at least 30 years in most historical market scenarios.
Where Did the 4% Rule Come From?
The rule originated from the "Trinity Study," a 1998 research paper by three professors at Trinity University. They analyzed historical stock and bond returns from 1926 to 1995 and found that a 4% initial withdrawal rate had a very high success rate across 30-year retirement periods.
How to Apply the 4% Rule
The math is simple: multiply your expected annual retirement expenses by 25. That's your target portfolio size.
- Spend $40,000/year โ need $1,000,000
- Spend $60,000/year โ need $1,500,000
- Spend $80,000/year โ need $2,000,000
Limitations of the 4% Rule
The 4% rule was designed for a 30-year retirement. If you retire early at 40 or 45, you may need a 3% or 3.5% withdrawal rate to ensure your money lasts 50+ years. It also assumes a specific stock/bond allocation and doesn't account for major expenses like healthcare.
Is the 4% Rule Still Valid Today?
Some financial planners argue that lower expected future returns mean a 3.3% rate is safer. Others point out that retirees naturally reduce spending in down markets, making 4% still reasonable. The key is to use it as a starting point, not a guarantee.
Use our free retirement calculator to see how the 4% rule applies to your specific situation.
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