The 4% rule is retirement planning's most famous benchmark. Here is how it works and where it falls short.
Where the 4% rule comes from
The 4% rule originated from financial advisor William Bengen's 1994 research and was reinforced by the Trinity Study. Bengen analyzed historical U.S. market data and found that retirees who withdrew 4% of their portfolio in year one, then adjusted for inflation annually, did not run out of money over any 30-year period studied. The rule assumes a balanced portfolio of roughly 50-60% stocks and 40-50% bonds. On a $1 million portfolio, the 4% rule produces $40,000 of first-year income, increasing with inflation each year thereafter, providing a simple, predictable income floor.
Limits and criticisms of the 4% rule
The 4% rule is a guideline, not a guarantee. It is based on historical U.S. returns that may not repeat, and it assumes a fixed 30-year retirement, which may be too short for someone retiring at 60. Critics note it ignores flexibility, real retirees adjust spending, so rigidly following it can leave money unspent or, in rare cases, fall short during prolonged downturns. Some researchers suggest a more conservative 3-3.5% for longer retirements or low-return environments, while others argue flexible retirees can safely start higher. Treat 4% as a reasonable starting point, then adapt.
Healthcare costs and the 4% rule
The 4% rule covers general spending but does not account for healthcare spikes. A large uncovered medical bill can force you to exceed your planned 4%, straining the strategy. Original Medicare leaves gaps with no out-of-pocket cap. A Medigap plan turns those costs into a predictable premium that fits cleanly into your budget. Call 1-800-MEDIGAP at 1-800-633-4427 to protect your withdrawal plan.