Four Isn’t Fate

Four percent is a starting line drawn from history's worst stretches, not a law. The rate is the part you choose.

Somewhere along the way, "4%" stopped being a finding and became a commandment. You'll hear it at work, at the barbecue, on podcasts: take 4% a year and you're set. The trouble is, the people who found it never said that.

What they found was a ceiling for a first year, built from the worst starting points in US history, and a reminder that plans need adjusting.^{2 3} Spending is still a choice. And whatever you don't spend doesn't vanish. It stays in the pile with a job to do. That's the part we like to call the rest keeps working.

Start with what the typical pile actually buys. Among households aged 65 to 74 who have a retirement account, the median balance was $199,600 in the Fed's 2022 survey, and about half of those households have no account at all.¹ At 4%, that pile pays $7,984 a year, about $665 a month.^M It lasts because it's small. Draw something closer to a living, $27,944 a year (14%), and at 6% after inflation it's gone in year 9.^M Bengen's rate answers how long a pile lasts, not whether it's enough to live on.² For scale, households aged 65–74 spent an average of $65,354 in 2024 (BLS, a mean, not a median).⁵ That's a different kind of number from the median pile, so the two aren't set against each other here.

Figure 8.1. Where Four Came From

Here's what William Bengen actually wrote in 1994: "I counsel my clients to withdraw at no more than a four-percent rate during the early years of retirement."² Read that slowly. No more than, and early years. Then: "After the first year, the withdrawal rate is no longer used for computing the amount withdrawn."² The 4% sets the first check. After that, you're spending last year's dollars plus inflation, not 4% of whatever the balance happens to be.

Four years later, three professors at Trinity University ran the numbers again and landed in the same neighborhood, with a line worth taping to the fridge: choosing a withdrawal rate "is not a matter of contract but rather a matter of planning," and "Mid-course corrections likely will be required."³ Planning, not a contract. Even the authors expected people to adjust.

The research didn't stop there. In 2013, with bond yields near historic lows, Michael Finke, Wade Pfau and David Blanchett asked what happens if bonds pay what they paid then instead of their long-run history. The estimated failure rate for a 30-year, inflation-adjusted 4% went from about 6% to 57%.⁶ That's a statement about 2013 yields and their assumptions, not about anyone's next 30 years. It's here because it shows the number was never fixed. Since then, a whole literature on flexible spending has grown up between "the same amount every year" and "a fixed share of what's left."⁷ The tool doesn't build those rules. It's enough to know they exist.

Figure 8.2. Same Pile, Three Rates

The tool starts at that $199,600: the median among holders, the typical household that has an account. Only 51.0% of households that age do.¹

It grows at 6% a year after inflation, the conservative end of the SEC's historical "6% or 7% 'real'" teaching line for stocks.⁴ Not a forecast; just a fair place to start the slider.

At those settings, a 4% draw is still going after 40 years, with $743,273 left. A 6% draw still has $88,394 at year 40. An 8% draw runs out in year 22.^M Same starting pile, same return. The only thing that changed is the rate, and the rate is the part you choose.

Some popular voices land higher. On Aug 24, 2026, Dave Ramsey said that "if you're invested in good mutual funds, you can withdraw 6 to 8% and never touch your principal."⁹ That's his view, and his math starts from a 12% return before inflation, with inflation at about 4.2%.⁹ This tool's 6% is already after inflation, so the two aren't the same assumption. Here, an 8% draw from the typical pile runs out in year 22.^M

Figure 8.3. Only the Order Changed

This one surprises people, so it gets its own picture. Take one set of 40 yearly returns that averages exactly 6%, compounded. Spend the same $7,984 a year. Now just shuffle the order. With the five bad years up front, the money runs out in year 30. With the same bad years at the end, $1,036,280 is left after 40 years.^M By year 10 the two paths are already far apart: $81,681 for bad-first against $323,021 for good-first.^M

None of this is news to the researchers. The Trinity authors warned that long-run averages hide "the critical short-term variations in rates of return," which "can have an impact on the ultimate outcome that is not reflected using long-term averages."³ Bengen saw the 1973–74 bear market (a deep two-year fall in stock prices) and its "deleterious impact" reach back to portfolios that started drawing years earlier.² And Pfau put it most plainly: people who save and behave identically "can otherwise experience very different outcomes based solely upon the specific sequence of investment returns," and "The vulnerability reaches its peak at the retirement date."¹⁰

It's also why Bengen built his ceiling from the worst starting years, and another reason a rate is something people revisit, not a one-time vow.

What people actually do

Here's the twist: many retirees with real savings don't take anything like 4%. In a study of households with at least $100,000 in financial assets, David Blanchett and Michael Finke found observed draws from savings of about 2.1% for married households at 65 (1.9% for singles).⁸ That's one research paper, funded by the industry and not peer-reviewed, about one sample. It isn't a national figure and it isn't a target. It just shows that the slogan and real behavior are often far apart.

Picture someone who reached the end of their working years with $5 million and still likes an $80,000 year: the kids are launched, the house is modest, and they don't want a bigger life just because a slogan says 4%. Simple division puts that draw at 1.6% of the start. That's teaching arithmetic, not a finding and not a safe rate. It shows what happens when the pile is large next to the life: most of the money is never asked to pay a bill. The rest keeps working.

At the defaults, a 4% start doesn't drain the pile; it ends 40 years later bigger than it began. Slide it up and you can watch where the line starts to bend. Slide it down and you see the other side: a smaller check, and more of the money still working.

What this is not

This isn't a safe rate, a guarantee, or a plan for anyone's money. The tool uses one steady return, and real returns come in an order nobody can see ahead of time. It shows the trade between how much you take and how long it lasts. Education, not advice.

Try it: Four Isn't Fate. Move the slider and see what you spend and what keeps working.