4% Rule
A retirement withdrawal strategy stating you can withdraw 4% of your portfolio annually for 30 years without depleting your assets. Core principle of the FIRE movement.
📝 Definition
What is the 4% Rule?
The 4% Rule is a retirement withdrawal strategy that was popularized by financial advisor William Bengen in 1994 and further supported by the 'Trinity Study.' After analyzing decades of historical stock and bond market data, the research concluded that if a retiree withdraws 4% of their initial portfolio balance in the first year of retirement—and adjusts that amount for inflation every year thereafter—the portfolio has a 95%+ probability of lasting at least 30 years. This rule has become the gold standard for individuals in the FIRE (Financial Independence, Retire Early) movement to determine their "retirement number."
In Simple Terms
A Simple Metaphor: The Self-Sustaining Orchard
Imagine you own an apple orchard. The 4% Rule says that if you only pick 4% of the apples each year, the trees will have enough energy to regrow and even produce more apples next year, allowing you to eat for the rest of your life without ever cutting down a tree. In financial terms, if you have $1 million saved, you can spend $40,000 (4%) in your first year of retirement. Next year, if inflation is 3%, you spend $41,200. Following this pattern, your $1 million should last 30 years or more. For dividend investors, if your portfolio yields 4% in dividends, you can live entirely off the "fruit" (dividends) without ever touching the "trees" (your principal investment).
Example
Calculating Your Retirement Goal
To use the 4% Rule to find your target retirement savings, simply multiply your desired annual spending by 25. For example, if you need $60,000 per year to live comfortably, your target is $1.5 million ($60,000 × 25). If you build a dividend portfolio yielding 4%, you would receive exactly $60,000 in passive income annually. If the companies you own also increase their dividends over time (dividend growth), your income will naturally keep pace with inflation, providing a much safer margin of safety than just selling shares.
💡 Practical Tips
- 1<strong>The 'Rule of 25':</strong> Quickly calculate your FIRE goal by multiplying your annual expenses by 25.
- 2<strong>Focus on Dividend Growth:</strong> To protect against inflation, prioritize 'Dividend Aristocrats'—companies that have increased their payouts for 25+ consecutive years.
- 3<strong>Flexible Withdrawals:</strong> During severe market downturns, consider reducing your withdrawal to 3% or 3.5% to preserve your capital (the 'Guardrails' approach).
- 4<strong>Maintain a Cash Buffer:</strong> Keep 1-2 years of living expenses in a high-yield savings account so you aren't forced to sell stocks when the market is down.
⚠️ Common Mistakes
The Risks of a Static Rule
A major mistake is treating the 4% Rule as an absolute law. It was based on historical US data and assumes a specific 30-year retirement window. If you retire at 40 and expect to live until 90, 4% might be too aggressive; a 3% or 3.5% withdrawal rate is often recommended for early retirees. Additionally, the rule is highly vulnerable to Sequence of Returns Risk—if the market crashes in the first few years of your retirement, a 4% withdrawal could deplete your portfolio much faster than anticipated.