The 4% rule is the most widely used guideline in retirement planning. It tells you how much you can safely withdraw from your savings each year without running out of money. Understanding it — and its limitations — is essential for anyone planning for retirement.
The rule: In your first year of retirement, withdraw 4% of your total savings. Each subsequent year, adjust that amount for inflation. Historically, this has allowed portfolios to last 30+ years in nearly all market conditions.
The 4% 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 tested different withdrawal rates to see how often portfolios survived 30-year retirements. A 4% withdrawal rate succeeded in over 95% of historical scenarios with a balanced portfolio.
Some financial experts argue the 4% rule is outdated. With lower expected bond returns and longer life expectancies, a 3%–3.5% withdrawal rate may be safer for today's retirees. Others argue that a flexible spending approach — reducing withdrawals in down markets — makes 4% or even 5% sustainable.
The 4% rule's biggest vulnerability is a market crash early in retirement. If your portfolio drops 40% in year one and you continue withdrawing 4%, you're selling assets at their lowest point — permanently reducing the portfolio's ability to recover. This is called sequence of returns risk.
One solution is keeping 1–2 years of expenses in cash, so you don't need to sell investments during a market downturn.
Use our retirement calculator to see how long your savings will last based on your withdrawal rate and expected returns.
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