After taking your target annual spending, multiplying it by 25, and getting some number that felt like it was three decades away, somewhere in the back of your head, you started wondering if early retirement was actually possible for you or just something other people do.
That number is wrong. This isn’t my controversial opinion. It’s math, it’s data, and it’s history.
The 4% rule is the problem. Most people treating it like gospel do not know where it came from, what it was actually designed to do, or the fact that even the guy who invented it has publicly said people are using it incorrectly.The 4% rule is too conservative, and it is inflating the number you think you need to retire.
Where the 4% Rule Actually Came From
William Bengen published his research in 1994. That is not ancient history, but it is also not yesterday, and a lot has changed about how markets actually perform. Bengen was a financial planner trying to answer a simple question: how much can a retiree pull from their portfolio each year without running out of money?
He ran historical market data going back to 1926. He tested every 30-year retirement window he could find. And he landed on 4% as the highest withdrawal rate that never failed across every single one of those windows, including the worst market runs in American history. The Great Depression. The brutal stagflation of the 1970s. All of it.
The key word is worst case. The 4% rule was designed as a floor, not a target. It was the answer to “what is the absolute worst it could get, and could you still survive?” And it was built around a 50/50 split between stocks and bonds. Not an aggressive, stock-heavy portfolio. A conservative, defensive mix designed for someone who was already 65 and needed to protect what they had.
You are not 65. You are probably in your 30s. And if you are serious about early retirement, you are not holding 50% bonds.
The Man Who Invented It Just Said It Is Too Low
Here is the part that should change how you think about all of this. Bengen himself, in his 2025 book “A Richer Retirement: Supercharging the 4% Rule to Spend More and Enjoy More,” updated his own research and said the safe withdrawal rate is now 4.7%.
But that is not even the most important thing he said.
Bengen now calls 4.7% the “Universal Safemax,” meaning it represents the worst-case scenario across all historical retirement periods, not the standard rate most retirees should use. Read that again. The worst case. The floor. The number that survived the single most brutal retirement scenario in recorded financial history.
Bengen’s updated research found that the average SAFEMAX across all 349 retirement scenarios he tested was approximately 7.1%. Seven point one percent. The average. Meaning in most historical scenarios, you could have pulled out more than 7% per year and still been fine.
Bengen has suggested that many retirees today may be able to withdraw between 5.25% and 5.5% without significantly increasing the risk of running out of money.
So the man who created the rule, after 30 years of additional research, is telling you that the 4% rule is too conservative. And yet most people planning for early retirement are still treating it as their hard ceiling. They are building their entire financial independence number around a figure that even its inventor has walked back.
What This Actually Does to Your Number
Let me show you what a one or two percentage point difference in withdrawal rate actually means for how long you work.
Say you plan to spend $80,000 a year in retirement. That is a reasonable number for a high-income earner who plans to live well, not lavishly.
At 4%, you need $2,000,000. At 5%, you need $1,600,000. At 5.5%, you need $1,454,000.
That is a $400,000 to $546,000 difference in the amount you need to accumulate before you can walk away. If you are adding (contributions + returns) $50,000 to $75,000 per year to your portfolio, that gap represents five to eleven years of your life. Five to eleven years of early mornings, corporate politics, performance reviews, and doing work you tolerate instead of work you choose.
The 4% rule is too conservative, and it is a number that, if you treat it as the truth without questioning it, will silently steal years from the best chapter of your life.
Flexible Spending Changes Everything
The 4% rule assumes you are a robot. It assumes you pull the same inflation-adjusted amount from your portfolio every single January, no matter what the market did that year. Market down 30%? You pull the same amount. Market up 25%? You pull the same amount. You just keep going on autopilot, completely indifferent to what is happening around you.
Nobody actually does this.
If the market drops hard in year two of your retirement, you spend a little less that year. You skip the big international trip. You eat at home more. You are not panicking, you are just adjusting the way any reasonable adult would. And that one small behavioral change, just pulling 10% less in a bad market year and skipping your inflation adjustment, is worth an enormous amount to your long-term portfolio health.
This is what the Guyton-Klinger guardrails research captures. Jonathan Guyton and William Klinger published their decision rules in 2006, and the core finding was straightforward: if you build in simple spending guardrails that adjust up or down based on portfolio performance, you can start at a meaningfully higher withdrawal rate than the rigid 4% rule allows.
The original Guyton-Klinger research found that retirees with a 65/35 stock-to-bond allocation could safely start as high as 5.4%, and those with a 50/50 allocation could start at 4.6%.
In their research, guardrails creators Guyton and Klinger concluded that much higher withdrawal rates, between 5.2% and 5.6%, would be sustainable over a 40-year retirement. Instead of $40,000, or 4%, on a $1 million portfolio, guardrails would allow for between $52,000 and $56,000.
That is a 30 to 40% increase in annual spending from the same portfolio. Just by building in the flexibility to cut back modestly in rough years. Which again, every normal person would naturally do anyway.
The rule is simple. If the market tanks and your withdrawal rate rises more than 20% above where you started, you cut your withdrawal by 10% that year. If the market runs and your rate drops more than 20% below your starting point, you give yourself a 10% raise. That is it. Two rules. And in exchange for following them, you get to start retirement with a significantly higher income and retire with a significantly lower portfolio balance.
You Will Earn Something. The 4% Rule Assumes You Won’t.
The 4% rule assumes the moment you retire, your income goes to zero. Permanently. You produce nothing. You earn nothing. Your portfolio is the only thing standing between you and financial ruin for the next 50 years.
Think about who is actually reading this. You have spent a decade or more building real, marketable skills. You are sharp. You know how to solve problems. You have professional knowledge that other people would pay for.
The 4% rule assumes you will do absolutely nothing with any of that for the rest of your life. Not a consulting project. Not a few months of freelance work. Not a business you build around something you genuinely enjoy. Nothing. Zero income. Forever.
That assumption is almost never true for early retirees, especially high-income professionals in their 30s and 40s. Most people who retire early end up doing some kind of work, because they find things they want to do. The difference is they do it on their own terms, for their own reasons, and they do not need it to cover their full living expenses.
If you generate $25,000 to $30,000 a year from some form of part-time work for even the first 10 years of retirement, the math on your portfolio changes completely. Your portfolio does not have to work as hard. You do not have to sell equities in bad market years. The sequence of returns risk that is most dangerous in the early years of retirement essentially evaporates because your portfolio sits untouched while your income covers your expenses.
Layer that on top of a flexible withdrawal strategy and you are looking at a picture that is dramatically more favorable than the 4% rule would ever suggest.
You Do Not Have to Leave It All Behind
Most people building toward early retirement are running their numbers with one silent assumption baked in that they never actually examined. They plan to preserve their principal forever. The 4% rule was literally designed around this idea. Withdraw 4%, let the portfolio keep growing, die with roughly what you started with
Say you retire at 40 with $1.5 million and you are comfortable ending your life with $300,000 left, enough to cover late-stage healthcare and leave something behind. You are not trying to die with $1.5 million still in the account. You are planning to use it. That changes your math. Your annual budget goes up. Your required starting balance goes down. And the years you have to spend accumulating that balance also goes down.
Let’s do the math. A 40-year-old planning to spend down from $1.5 million to $300,000 over 45 years, assuming a 7% average annual return, can sustainably pull roughly $105,000 per year. Someone trying to preserve that same $1.5 million forever, using a rigid 4% rule, pulls $60,000. That is $45,000 more per year from the same starting portfolio. Or looked at the other way, the person spending $60,000 a year and willing to draw down their principal does not need $1.5 million to start. They need closer to $900,000. If you are adding $75,000 a year to your portfolio, the difference between a $900,000 target and a $1.5 million target is eight years of your life.
Eight years.
That is the cost of using a rule that assumes you want to preserve your principal when you probably didn’t even know that it did that five minutes ago. Your kids will learn how to make money. Your legacy does not depend on handing them a seven-figure account. What it depends on is you being present, healthy, and free during the years when that actually matters. Spend the money. That is what it is for.
What You Should Actually Use Instead
Stop using 4% as your multiplier and start using 5% or 5.5% for your planning number.
Before anyone clutches their pearls, that is not reckless. That is grounded in the actual research. Bengen himself says 5.25% to 5.5% is reasonable for most retirees today. Guyton-Klinger puts the flexible starting rate at 5.2% to 5.6%. And those numbers assume zero additional income, no spending flexibility, and some of the worst market conditions in American financial history.
You are planning for flexible spending. You will likely earn something in your early retirement years. You are investing aggressively during accumulation with a stock-heavy portfolio that performs at a level the original Trinity Study never accounted for. The Nasdaq has averaged roughly 20% annually over the last decade. The S&P 500 has averaged around 15%. The return assumptions baked into the 4% rule were built on an era where 8 to 10% was the ceiling.
Use 5% for conservative planning. Use 5.5% for your best-case scenario. Keep a two to three year cash buffer so you never have to sell stocks in a down market early in retirement. Build in the simple guardrails: cut spending modestly in a rough year, give yourself a raise in a strong one.
Go back and recalculate your number. Using 5% instead of 4% on that same $80,000 annual budget takes your target from $2,000,000 down to $1,600,000. You might already be there. You might be a year or two away instead of five. And if that is true, every day you spend at a job you do not want to be at, working toward a number that was always too high, is a day you handed over for no reason.
Portfolio needed to spend $80,000/year
| Retirement length | Traditional rigid | Guardrails | Guardrails + spenddown |
|---|---|---|---|
| 20 years | $1,454,000 | $1,230,000 | $1,013,000 |
| 30 years | $2,000,000 | $1,538,000 | $1,290,000 |
| 40 years ★ | $2,162,000 | $1,739,000 | $1,404,000 |
| 45 years | $2,319,000 | $1,818,000 | $1,482,000 |
| You save vs rigid (40yr) | $423,000 less | $837,000 less |
The Bottom Line
The 4% rule is not worthless. It is just wrong for you. It was built on worst-case scenarios from 1926, designed for a 65-year-old with a conservative portfolio trying to survive a 30-year window. It was never calibrated for someone in their 30s with decades of compounding ahead.
But there are three things you can do, each one independently, that pull your retirement date closer.
Withdraw at 5.5% with flexible spending guardrails instead of a rigid 4%, and on an $80,000 annual budget your required portfolio drops from $2,000,000 to $1,454,000. Plan to spend down your principal instead of preserving it forever, and your required starting balance drops further still. Generate $25,000 to $30,000 a year in your first decade of retirement doing something you actually chose to do, and your portfolio barely has to move during the most dangerous stretch for sequence of returns risk.
Now imagine you use all three of these together.
There is no version of this math where using all three of these together does not cut your financial independence number and move your retirement date way earlier. None. The only question is whether you keep using a rule from 1994 that was never designed for you, or whether you actually run your numbers the right way.
If you want to grab the free guide “10 Quiet Mistakes That Kill Your Early Retirement” and see where you actually stand, you can get it here. Takes about 20 minutes and will probably change what you think your timeline looks like.
