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The 4% rule is the most famous number in retirement planning. But is it the right number for you in 2026? Enter your details below to find out.
The 4% rule is a retirement withdrawal guideline that says you can withdraw 4% of your portfolio in your first year of retirement, then adjust that dollar amount for inflation each year, and your money should last at least 30 years. On a $1 million portfolio, that means starting with $40,000 per year ($3,333/month), then increasing by inflation annually.
The rule was created by financial planner William Bengen in 1994. He analyzed every possible 30-year retirement period using U.S. stock and bond data going back to 1926 and found that a 4% starting rate survived even the worst historical periods, including the Great Depression, the stagflation of the 1970s, and the early 1980s bear market.
His work was independently validated by the Trinity Study in 1998, which tested various withdrawal rates against different stock-bond allocations. The 4% figure became the most widely cited rule of thumb in retirement planning, referenced by financial advisors, media outlets, and retirement forums everywhere.
The 4% Rule in Practice
Note: The withdrawal percentage of your current portfolio will fluctuate, sometimes exceeding 4%, sometimes dropping below it. The rule is about the initial dollar amount adjusted for inflation, not maintaining a fixed 4% of the current balance.
Bengen's research was rigorous, but the financial world has changed substantially since the data period he analyzed. Here is why the 4% rule deserves scrutiny for anyone retiring today:
When Bengen studied historical returns, the average CAPE (cyclically adjusted price-to-earnings) ratio was around 16-17. In early 2026, it sits above 30. Higher starting valuations have historically been associated with lower subsequent returns over the next 10-15 years. This does not guarantee poor returns, but it shifts the probability distribution. Starting a 30-year retirement at elevated valuations means the 4% rule has a thinner margin of safety than it did historically.
During much of the period Bengen studied, bonds yielded 6-8% or more. Bonds in the 1980s and 1990s delivered equity-like returns as rates declined from double digits. In 2026, bond yields have recovered to the 4-4.5% range, which is healthier than the near-zero rates of 2020-2021, but still well below the levels that powered past 4% rule success stories. Bonds now provide less of a cushion during stock market downturns.
Bengen tested 30-year retirements. But a 60-year-old today has a good chance of living to 90 or beyond. A 55-year-old retiring early may need 40+ years. The 4% rule was never designed for these longer time horizons. Research shows that extending the retirement period to 40 years drops the safe rate to roughly 3.5%, and 50 years brings it closer to 3%.
Does this mean the 4% rule is dead?
Not exactly. It means the 4% rule is a useful benchmark, not a personalized plan. For some retirees, especially those with shorter time horizons, significant Social Security income, or spending flexibility, 4% may still be perfectly safe. For others, especially early retirees or those with aggressive portfolios and no other income, it may be too high. The point is to find your rate, not to blindly follow a 30-year-old rule of thumb.
The greatest limitation of the 4% rule is that it is static. You pick a number on day one and mechanically adjust it for inflation forever, regardless of what markets do. No rational person actually behaves this way. If your portfolio drops 35% in year two, you are going to cut back on discretionary spending. If your portfolio doubles in the first decade, you are going to allow yourself a nicer vacation.
Modern retirement research has moved toward dynamic withdrawal strategies that adjust spending based on portfolio performance. These strategies consistently outperform static approaches in two important ways:
Our calculator gives you a starting withdrawal rate based on AI analysis of thousands of scenarios. But the real power comes from adjusting that rate over time as your portfolio and circumstances evolve. That is why RetireFree offers monthly recalculations that tell you exactly how much you can spend based on current conditions, not a 30-year-old formula.
The Multiply-by-25 Shortcut
The 4% rule implies you need 25 times your annual expenses saved (because 1 / 0.04 = 25). If you need $60,000/year from your portfolio, that means $1.5 million. But this ignores Social Security and other income. If Social Security covers $28,000/year, your portfolio only needs to supply $32,000/year, requiring about $800,000. Always factor in all income sources before calculating your target number.
For a deeper analysis of why static rules fall short, read why the 4% rule may no longer be enough. To learn about the broader concept of finding your personal rate, try our safe withdrawal rate calculator or our retirement withdrawal calculator for a dollar-amount perspective. And for a research-backed overview, see our guide on what is a safe withdrawal rate.
The 4% rule is a retirement guideline developed by William Bengen in 1994. It says you can withdraw 4% of your portfolio in your first year of retirement, then adjust that dollar amount for inflation each subsequent year, and your money should last at least 30 years. For a $1 million portfolio, that means withdrawing $40,000 in year one, then increasing by the inflation rate each year after that.
It depends on your situation. The 4% rule was derived from historical periods with lower stock valuations and higher bond yields than today. With the CAPE ratio above 30 and bond yields around 4-4.5%, many researchers recommend a starting rate of 3.3% to 3.8% for new retirees. However, if you have significant Social Security income, a shorter retirement horizon, or flexibility to reduce spending during downturns, 4% may still work for you. The calculator above tests this against your specific details.
A personalized, dynamic withdrawal strategy outperforms the static 4% rule. Instead of withdrawing a fixed inflation-adjusted amount no matter what markets do, dynamic strategies adjust spending based on portfolio performance. You reduce withdrawals somewhat after major declines and increase them after sustained growth. Research shows this approach supports higher average lifetime spending while also reducing the risk of running out of money.
The 4% rule implies you need 25 times your annual expenses saved (since 4% of 25x equals 100% of one year's expenses). If you need $50,000 per year from investments, you need $1,250,000. If you need $80,000 per year, you need $2,000,000. Importantly, this is the amount your portfolio needs to cover, not your total spending. Social Security, pensions, and other income reduce the target. If Social Security covers $24,000/year of your $50,000 need, your portfolio only needs to supply $26,000/year, requiring about $650,000.
The 4% rule does not adjust when markets crash or boom. RetireFree does. Get monthly withdrawal recommendations based on your actual portfolio performance and current market conditions. Start free.
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