Safe Withdrawal Rate for a 50-Year Retirement: What the Data Says

3.5%. Most of the research on the safe withdrawal rate for a 50-year retirement lands near that number, and the more cautious studies go as low as about 3.25%. Either way it's below the famous 4% rule. If you're planning to stop working in your 40s, or you just want your money to last into your late 90s, those few tenths of a point decide how much you need to save and how much you can spend each year.

Here's where the numbers come from, why they're less certain than they look, and how to check them against your own plan.

The short answer: plan around 3.25% to 3.5%

Over a 50-year horizon, the published research mostly agrees:

• The Poor Swiss updated the Trinity study with data from 1871 to 2025. A 3.5% withdrawal rate from a 100% stock portfolio succeeded more than 98% of the time over 50 years (The Poor Swiss, Updated Trinity Study).
• Money Guy asks whether 4% can survive a 50-year early retirement and suggests going down to about 3.5% (Money Guy).
• Jeremy Jeske, speaking on ChooseFI, argues that much higher figures like 5.5% don't hold up over 50 years. He also says you shouldn't need to go much below about 3.25% (ChooseFI, episode 563).

So 4% isn't automatically a disaster. But for 50 years it's a stretch. The research points half a point or so lower.

Why the 4% rule wasn't built for 50 years

The 4% rule was tested on 30-year retirements. Make the retirement 20 years longer and the odds change.

Early Retirement Now (ERN) has one of the most detailed studies of this, using historical data from 1871 to 2016. At a 4% withdrawal rate with a 50/50 stock/bond portfolio, ERN found about 95% success over 30 years. Over 60 years, that fell to about 65% (ERN, The Ultimate Guide to Safe Withdrawal Rates – Part 1).

The withdrawal rate is the same in both cases. The only thing that changed is the number of years the money has to last.

Each extra decade is another decade of inflation, another chance at a bad market, and another ten years of withdrawals coming out of a portfolio that may already be down.

Safe withdrawal rates by retirement length

This is how the numbers compare across horizons. Keep in mind they come from different methods and data sets.

The ChooseFI horizon figures come from its early retirement 4% rule guide, which doesn't name the study behind them. Use them as a rough guide to the trend, not as exact numbers.

That trend is the useful part. Going from 30 to 50 years costs about half a percentage point. Going from 50 to 60 costs much less.

The newer, higher numbers are still 30-year numbers

You may have seen headlines saying safe withdrawal rates have gone up. They have. But both of the big recent updates are for 30-year retirements.

Morningstar: 3.9%. Morningstar's research puts the safe starting withdrawal rate at 3.9%, up from 3.7% the year before (Morningstar, What's a Safe Retirement Withdrawal Rate for 2026?). "Safe" here means the money is still there in 90% of simulated outcomes over 30 years. It isn't based on an average return. Source: Morningstar, The State of Retirement Income 2025, Dec 2025.

Bengen: 4.7%. Bill Bengen, who came up with the original 4% rule, raised his baseline to 4.7% in his 2025 book A Richer Retirement. The new figure adds more asset classes and adjusts for market valuation and inflation (Advisor Perspectives; Bankrate). It's still a 30-year worst case.

Neither number applies directly to a 50-year retirement. If you start from either one, adjust it down for the longer horizon. The table above gives you a rough idea of how much.

Why 50-year success rates are less certain than they look

Most of the ranking research is backtesting. It replays US market history from 1871 onward and checks whether a given withdrawal rate would have survived each period.

There's a problem with that over long horizons. From 1871 to 2025 there are only about three separate, non-overlapping 50-year periods. A study can run many overlapping start years, but they share most of the same decades. A bad stretch like the 1960s and '70s shows up in dozens of those "different" retirements.

So a figure like "98% success over 50 years" rests on far less independent history than the precision suggests. It's a reasonable estimate, but it isn't something we've actually watched happen dozens of times.

Monte Carlo simulation comes at it another way. In plain terms, instead of replaying one history, it generates many possible futures with realistic ups, downs, and sequences of returns, then counts how many of them your plan survives. That's the method behind Morningstar's 90% figure. It's also how we work: Monte Climb runs your savings, age, and monthly spending through 1,000 simulated futures and gives you a success rate.

Neither method can predict the future. History shows what actually happened. Monte Carlo shows how wide the range of possible outcomes is. Over 50 years, it helps to look at both.

What moves your 50-year number up or down

A withdrawal rate depends on your whole plan. These are the choices that make the biggest difference over a long horizon.

Your stock allocation

ERN found that beyond 30 years, 100% stocks gave the highest success rates in historical testing (ERN Part 1). With 50 years to go, growth matters more than steadiness. The catch is that you have to be able to hold on through large drops without selling.

Flexibility in bad years

Nearly every source says to cut spending when markets fall. Few say by how much. The principle is simple: a withdrawal rate that can come down in bad years doesn't have to start as low as one that never changes. Be honest about how much of your budget you could actually cut, and for how long.

The bridge to Social Security

If you retire at 45, you could spend 15 or more years drawing only from your portfolio before Social Security starts. A more realistic plan has two phases:

1. Bridge years: higher withdrawals from the portfolio, because nothing else is coming in.
2. After you claim: lower withdrawals, because Social Security covers part of your spending.

A single flat rate for 50 years misses that shape. Your average rate over the whole retirement can be fine even if the early years look high.

Health care, before and after Medicare

If you retire early, you'll be paying for health insurance yourself until Medicare starts at 65. After that the costs don't go away. Fidelity's 2025 estimate is $172,500 in Medicare premiums, deductibles, and prescriptions for one 65-year-old over retirement, not counting long-term care. Source: Fidelity Investments, 2025 Retiree Health Care Cost Estimate, Jul 2025. That's a line item in your budget. It's too big to round away.

Spending down to zero or keeping the principal

Most success rates count a plan as a success if it ends with $1 left. If you want to leave the original amount untouched, or leave money to heirs, your safe rate is lower. ERN covers this in detail in its safe withdrawal rate series.

Fees and taxes

Small costs compound over 50 years. A fund fee or tax cost that barely matters in a 20-year plan takes a noticeable bite out of a 50-year one. Count your withdrawal rate after these costs, not before.

Longevity: is 50 years even long enough?

If you retire at 45, 50 years takes you to 95. That isn't overly cautious. The Social Security Administration estimates that about one in three 65-year-olds may live to at least 90. Source: Social Security Administration, Retirement Information for Medicare Beneficiaries, 2026. A plan that stops at 85 is betting you won't be one of them.

That's why the plan you build here runs to 95 by default, and you can extend it further.

How to test your own 50-year plan

The published rates are a starting point. Your plan has its own savings, spending, start age, and income sources, and those can move your safe rate well away from any one study's number.

You don't need much to start. Three numbers:

• Your age
• What you've saved for retirement
• What you spend each month

Enter them in the free in-browser retirement calculator and you'll see what share of 1,000 simulated futures stay funded. It runs in your browser, and nothing is saved until you say so. Then you can ask William, our AI planner, questions like "Am I on track?" or "What's a sustainable spend for me?" He shows his work, so you can see why a plan passes or fails.

It's planning software, not advice. The result is a probability, not a promise. For a 50-year plan, though, knowing the probability is far more useful than guessing.

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Frequently asked questions

What is a safe withdrawal rate for a 50-year retirement?

Most research puts it at about 3.25% to 3.5%. The Poor Swiss's updated Trinity study found that a 3.5% rate from a 100% stock portfolio succeeded more than 98% of the time over 50 years, using data from 1871 to 2025.

Does the 4% rule work for a 50-year retirement?

It's a stretch. The 4% rule was tested on 30-year retirements. Early Retirement Now found that a 4% rate with a 50/50 portfolio went from about 95% success over 30 years to about 65% over 60 years. Most sources suggest going down to about 3.5% for 50 years.

Does Morningstar's 3.9% safe withdrawal rate apply to early retirees?

Not directly. Morningstar's 3.9% is for a 30-year retirement, with money still there in 90% of simulated outcomes. Bengen's 4.7% is also a 30-year number. For a 50-year horizon, adjust either one down.

What stock allocation works best for a 50-year retirement?

In Early Retirement Now's historical testing, 100% stocks had the highest success rates for horizons longer than 30 years. The catch is that you have to be able to ride out large market drops without selling.

How does Social Security change a 50-year withdrawal plan?

It splits the plan into two phases. Before you claim, everything comes out of your portfolio, so withdrawals are higher. After you claim, Social Security covers part of your spending and portfolio withdrawals can drop. A single flat rate for 50 years misses that shape.