Short answer: yes, for most people the 4% rule is still a sensible place to start. But it was never meant to be a set-and-forget autopilot. It is a starting dial. Understand what it actually promises and you will worry less, spend more comfortably, and avoid the trap most retirees fall into: dying with far more money than they ever needed.
Key takeaways
- The 4% rule means you withdraw 4% of your savings in year one, then adjust that dollar amount for inflation each year after. The shortcut: save about 25 times your annual spending.
- It was calibrated to the worst retirements in U.S. history (people who retired into the 1929, 1937, and 1966 downturns). It already prices in a crash.
- In most historical retirements, 4% left people richer after 30 years, not broke. Underspending is the more common outcome.
- Start nearer 3.5% if valuations are high or you are planning for 40+ years. You can spend more later if markets cooperate.
- Planning all the way to age 95 often means over-saving and under-living. Match your plan to a realistic lifespan, then add a buffer.
Where the 4% rule came from
In 1994, a financial planner named William Bengen ran a simple experiment. He took every 30-year retirement window in U.S. history back to 1926 and asked: what is the highest starting withdrawal rate that would have survived all of them, including the worst? His answer, published in the Journal of Financial Planning, was about 4.15%. Rounded down, that became "the 4% rule."
A few years later, three Trinity University professors ran a similar test and confirmed it. Their 1998 study found that a balanced stock-and-bond portfolio withdrawing 4% (adjusted for inflation) survived 30 years in 95% to 100% of historical periods. Push it to 5% and the success rate fell to about 83%. At 6%, it dropped to roughly 68%.
The mechanics are easy. Take 4% of your nest egg in year one. Each following year, give yourself a raise equal to inflation. The famous shortcut falls out of the math: if you can live on 4% of your savings, you need roughly 25 times your annual spending. Want $60,000 a year from your portfolio? You are aiming for about $1.5 million.
The part almost everyone misses
Here is the thing that changes how you should feel about the whole rule. Bengen's 4% was not the average outcome. It was the number that survived the single worst run in the data.
The poster child is someone who retired on 1 January 1966. Their 30-year average return looked perfectly normal. What sank them was the order of returns: brutal years early on, including a stretch where U.S. stocks lost roughly 48% in real terms across 1973 and 1974. Selling shares to fund spending while prices are on the floor does permanent damage. That is called sequence-of-returns risk, and it is the real enemy in early retirement, not the long-run average.
So the 4% rule is already a worst-case number. It bakes in a 1929, a 1966, an early crash. In the typical history, 4% was far too cautious. Retirees who followed it often ended up with more money than they started with, sometimes several times more. If you take one idea from this article, take that one: for most people, "running out" was never the likely outcome. Leaving a large accidental inheritance was.
Is 4% still safe in today's market?
This is the fair worry. When stock valuations are high and bond yields are modest, future returns tend to be lower, and researchers at Morningstar have argued the safe starting rate today is closer to 3.9% rather than a flat 4%. Their guidance has drifted between roughly 3.7% and 3.9% over the past couple of years, depending on conditions.
Two things keep this from being alarming.
First, what matters most is the sequence of returns in your first 10 to 15 years, not the 30-year average. High valuations say something about the next decade, but markets tend to mean-revert over longer stretches, so a genuinely 1966-level outcome is the exception, not the base case.
Second, a lower starting number is not a life sentence. Bengen himself, revisiting his work in a 2025 book, argued that with broader diversification the safe rate can sit higher, around 4.7%. The honest read across all this research is a range, not a magic decimal: somewhere between about 3.5% and 4.5%, chosen to fit your situation.
When to start lower than 4%
Dial your starting number toward 3.5% if either of these is true:
- Valuations are stretched when you retire. Starting into a rich market is exactly the setup that produced history's tight cases.
- Your retirement could run 40 years or more. The original rule was built for 30. Early retirees need a wider margin because there are simply more years for things to go wrong.
Starting lower is not about being timid. It is about buying yourself the option to spend more later, once you have cleared the danger zone of those first several years.
The fix that beats any fixed number: guardrails
The biggest flaw in the 4% rule is not the 4%. It is treating it as autopilot. Nobody actually spends the identical inflation-adjusted amount for 30 years while their portfolio doubles or halves around them. Real people look up occasionally and adjust.
That is what "guardrails" formalize. You set an upper and lower boundary around your withdrawals. If markets do well and your portfolio surges, you give yourself a raise. If markets fall hard, you trim a little, often just skipping an inflation increase for a year. Small, timely adjustments let you start with a more generous number and stay safe, because you are no longer locked into spending blindly through a downturn. Splitting your budget into "must-have" and "nice-to-have" makes this painless: the essentials stay steady, the travel-and-fun bucket flexes.
How long will your money really last?
The quieter risk for most disciplined savers is not running out. It is under-living. Many retirees withdraw less than they safely could, watch their balance climb, and confuse caution with a plan.
Part of that comes from planning to an age that is unlikely to arrive. A 65-year-old man today has a coin-flip chance of reaching about 84, a woman about 87, according to the Social Security Administration's actuarial data. For a couple, there is roughly a 1-in-5 chance that one partner reaches 95. Planning every dollar as if you will both hit 95 is prudent as a backstop, but if you let that assumption drive your everyday spending, you may spend your entire retirement being poorer than you needed to be so that your heirs can be richer than you intended.
A better frame: estimate a realistic lifespan for your health and family history, add a sensible buffer, keep some flexibility, and revisit the numbers every few years. "Will I run out?" is the wrong question for most people. "Am I leaving too much on the table?" is the one worth asking.
The honest bottom line
The 4% rule is not dead, and it is not a promise carved in stone. It is a well-tested starting dial built on the worst outcomes history could throw at it. Treat it as a floor to build from, not a ceiling to fear. Start near 3.5% to 4% depending on valuations and your time horizon, use guardrails so you can spend more when markets are kind, and plan to a realistic lifespan rather than an arbitrary 95.
If you would like a plain-English second opinion on whether your own number holds up, that is exactly what a money person is for. Ed Wealth's free Reality Check walks through your savings, spending, and timeline and tells you where you actually stand. If you want ongoing help, Ed is a flat $299.99 a year, never a percentage of your money. Worth a look if you are still deciding how to set your financial goals or weighing whether to pay off your mortgage or invest.
This article is for general education only and is not personalized financial, investment, or tax advice. Your situation is unique; consider your own circumstances before acting.
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