Retirement
The 3% Rule vs. the 4% Rule
Understand what withdrawal rates do, why the time horizon matters and how flexibility changes the result.
What a withdrawal rate means
A starting withdrawal rate converts first-year portfolio income into a rough capital target. Under a common 4% example, a retiree withdraws 4% of the opening portfolio in year one and then adjusts that dollar amount for inflation. It does not mean withdrawing 4% of the changing balance every year.
A $40,000 first-year portfolio withdrawal corresponds to $1 million at 4% and about $1.33 million at 3%. The lower rate requires more starting capital but leaves a larger margin for a long retirement or poor early returns.
Why neither number is a promise
Withdrawal research depends on a specific portfolio, market history, time horizon and spending rule. Historical studies commonly model diversified portfolios that combine stocks and bonds, not cash or one undiversified holding. Taxes, investment fees and advisory costs reduce the amount available to spend. A retirement lasting 40 or 50 years presents a different problem from a 30-year period.
Sequence risk also matters. Losses early in retirement can do more damage because you are withdrawing money before the market has time to recover. No fixed rule can predict your future spending, returns or lifespan.
Use a range and a response plan
Test more than one rate and decide in advance what can change. Planned responses to portfolio results are often called spending guardrails. Flexible travel spending, temporary work, delayed large purchases or smaller inflation increases after a weak year can all reduce pressure on a portfolio.
Treat Social Security, pensions and other dated income separately. A higher withdrawal during a short bridge period may be reasonable if a reliable income source begins later, but it should be modeled as a staged cash flow rather than one lifetime rate.
Bottom line
Use 3% and 4% as starting points, then test how a longer retirement, fees, taxes and flexible spending change the plan.
Related calculators
Sources
- William Bengen: Determining Withdrawal Rates Using Historical Data (opens in a new tab)
- Social Security Administration: Retirement Benefits (opens in a new tab)
This guide is for general education, not personal investment, tax, legal or financial advice. Check current rules and talk with a qualified professional when the decision calls for it.