Is the 4% Rule Still Safe in 2026?

Updated June 2026 · 7 min read

Short answer: as a starting point, yes. The 4% rule is still a reasonable anchor for a 30-year retirement. But "safe" depends on two things the rule was never designed for: how long your retirement actually lasts, and whether you're willing to adjust spending when markets fall. If you're retiring early, you probably want to start lower than 4%.

Where the 4% rule comes from

In 1994, a financial advisor named William Bengen tested every 30-year retirement window in US history. He wanted to know the highest withdrawal rate that never ran out of money, even for someone unlucky enough to retire right before a crash. The answer came out at about 4%.

A few years later, three professors at Trinity University ran a similar study and got a similar result. Their work is where the "Trinity Study" name comes from, and it's why 4% became the default rule of thumb for retirement planning.

The rule is simple: in your first year of retirement, withdraw 4% of your portfolio. Every year after that, increase the dollar amount by inflation, ignoring what the market does. At a 4% rate, your starting portfolio needs to be 25 times your annual spending.

What "safe" actually meant

This is the part people skip. The 4% rule was never a guarantee. In the original research, a portfolio following the rule survived a full 30 years in roughly 95% of historical cases. That's a high success rate, but it isn't 100%, and the cases where it failed were the ones where a bad market arrived in the first few years of retirement.

That early-years problem has a name: sequence of returns risk. Two retirees can earn the same average return over 30 years and end up in completely different places, purely based on the order those returns showed up. A crash in year two, while you're also withdrawing, does damage that a crash in year 25 never could.

Why 2026 raises the question

Two things make people nervous about the 4% rule right now.

First, valuations. US stocks have spent recent years at historically high price levels relative to earnings. High starting valuations have, in the past, lined up with weaker returns over the following decade. Nobody can predict the next ten years, but it's a fair reason to be cautious rather than aggressive with your withdrawal rate.

Second, and more important for this audience: the 4% rule assumes a 30-year retirement. Someone retiring at 65 is the model. If you're aiming to retire at 45 or 50, you might be planning for 45 or more years, and a withdrawal rate that's safe over 30 years is not automatically safe over 45.

The early-retirement adjustment

For longer retirements, most planners suggest starting somewhere between 3.25% and 3.5% instead of 4%. The trade-off is real: a lower rate is safer, but it means a bigger portfolio before you can stop working.

Here's what that costs, for someone who spends $40,000 a year:

Going from 4% to 3.5% raises your target by about 14%. That's the price of buying extra safety for a longer retirement. Whether it's worth it depends on how much flexibility you have, which brings up the thing that matters more than the exact rate.

Flexibility matters more than the exact number

The 4% rule assumes you withdraw the same inflation-adjusted amount every year no matter what, even in the middle of a crash. Almost nobody actually behaves that way. And that rigidity is exactly what makes the rule conservative.

If you're willing to trim spending in bad years, even a little, your safe withdrawal rate goes up meaningfully. Skipping the inflation raise after a down year, or cutting discretionary spending by 10% when your portfolio drops, removes most of the worst-case scenarios the rule was protecting against. A retiree who can flex their spending can often support a higher rate than one locked into a fixed paycheck.

This is also why William Bengen, the person who came up with the rule, has said for years that 4% was a conservative floor, not a ceiling. With broader diversification and some flexibility, he's argued the genuinely safe rate is often higher than 4%. The headline number became famous; the nuance behind it got lost.

So, is the 4% rule safe?

For a 30-year retirement, with a stock-heavy portfolio and some willingness to adjust, it's a solid planning anchor. Treat it as a way to estimate your target, not a promise.

For early retirement, lean more conservative. Starting at 3.25% to 3.5% gives you a buffer for the longer horizon and for the chance that the next decade of returns is below average. And build in flexibility from the start, because the ability to spend a little less in bad years is worth more than any single percentage point on a spreadsheet.

The best move isn't to argue about whether 4% or 3.5% is "correct." It's to test your own number against history and see how it holds up across good and bad starting years.