Withdrawal rate is the percentage of your retirement savings you take out each year to cover living expenses. It's one of the most critical decisions in retirement planning because withdrawing too much risks depleting your savings prematurely, while withdrawing too little means sacrificing your quality of life unnecessarily when you have money available to enjoy.

The most well-known guideline is the 4% rule, which suggests withdrawing 4% of your total retirement savings in the first year of retirement, then adjusting that dollar amount annually for inflation. So if you have $1 million saved, you'd withdraw $40,000 in year one, then perhaps $41,200 in year two if inflation was 3%. Research shows this approach historically gave retirees a high probability of making their money last at least 30 years, though recent analysis suggests 3-3.5% might be safer given today's lower expected investment returns and longer life expectancies.

Your personal withdrawal rate depends on several factors beyond just following a rule. How long your retirement might last based on your health and family history, what other income sources you have like Social Security or pensions, your investment allocation and expected returns, your flexibility to reduce spending if markets perform poorly, and whether leaving an inheritance matters to you. Many retirees use a dynamic withdrawal strategy—starting at 4-5% but adjusting based on market performance, spending more in good years and tightening the belt after market downturns. The key is being intentional and realistic, monitoring your progress regularly, and staying flexible enough to adjust your withdrawal rate as your retirement unfolds.