Safe Withdrawal Rate for 20-Year Retirement Plans

Roughly 5%. That's where most research lands on the safe withdrawal rate for 20-year retirement plans. For comparison, Morningstar's 2025 base case for a 30-year retirement is 3.9%. A shorter horizon lets you spend more each year, because the money has fewer years to cover. The question that matters more is whether 20 years is actually long enough for you. Sometimes it isn't, and if it isn't, the higher rate stops being a good deal.

Here's what the numbers say, what they assume, and where they can mislead you.

The short answer

If you need your savings to last about 20 years, published research mostly puts a sustainable starting withdrawal rate at about 4.5% to 5% a year, adjusted for inflation each year after that. Forward-looking estimates, which assume future returns may be lower than past ones, come in more cautious than historical backtests.

That's a range. It isn't a single number, and it isn't a guarantee. Each figure comes with a chosen level of risk, usually a 90% chance that the money lasts.

What the research says about the safe withdrawal rate for 20-year retirement horizons

Different studies use different methods, so it helps to put them side by side.

A few notes on reading this table:

• Morningstar's figure changes every year. Its base case was 4.0% in 2023, 3.7% in 2024 and 3.9% in 2025. The 30-year rows come from the 2025 report. The 20- and 15-year rows come from an earlier edition, as reported by Keil Financial Partners. We couldn't confirm the exact year, so read them as indicative.
• Bengen's work is the origin of the "4% rule." Under the same historical method, a shorter horizon supported close to 5%. That's according to Money Crashers' overview.
• The Retirement Income Journal analysis of retirement lengths and failure probabilities puts a 20-year horizon with a 10% failure chance at about 4.8%.
• The Poor Swiss re-ran the Trinity study with data through 2025. Its update found that for 20 years with inflation adjustments, about 6% is the limit, and that rate works only a little over three-quarters of the time.

So pushing from 5% to 6% doesn't just add a point of spending. It takes you from roughly 9-in-10 odds to roughly 3-in-4.

What "safe" actually means

"Safe" sounds like a guarantee. It isn't one.

In this research, a withdrawal rate counts as safe if the money is still there at the end in a set share of scenarios. Morningstar uses 90%, which means 900 of 1,000 simulated futures end with money left. In the other 100, the portfolio runs out early.

Look at what happens when you ask for certainty. Morningstar's 30-year number falls from 3.9% to 2.5% if you need 100% of scenarios to succeed. That's a big cut in spending to cover the worst few outcomes.

So you're always making a trade-off:

• Higher withdrawal rate: more income now, lower odds the money lasts.
• Lower withdrawal rate: less income now, higher odds, and often a lot left over at the end.

Neither choice is wrong. You just need to know which one you're making.

Is 20 years really your horizon?

The research above takes "20 years" as given. Your plan shouldn't.

If you retire at 65, a 20-year plan runs out of money at 85. The Social Security Administration's planning guidance says about one in three 65-year-olds may live to at least 90 (SSA, Retirement Information for Medicare Beneficiaries, 2026). A plan that ends at 85 is betting you won't be one of them.

A 20-year horizon makes more sense when the money only has to cover a defined period, such as:

• Retiring at 70 or later. Twenty years takes you past 90.
• Bridging to Social Security or a pension. Your savings cover the gap, and guaranteed income takes over after that.
• Spending down one pool of money while other assets cover later life.

If none of those apply, it's worth testing a longer horizon too. Time works against you here. The Poor Swiss found that at 40 years, even a 4% withdrawal rate drops below 90% success unless the portfolio is 100% stocks.

For this reason, the plan you build at Monte Climb runs to age 95 by default, and you can extend it.

Why the first few years matter most

Two retirements can have the same average return and end very differently. The order of returns matters. This is called sequence-of-returns risk.

If markets fall sharply early in retirement while you're still withdrawing, you sell more shares at low prices. Those shares aren't there for the recovery. A bad decade late in retirement does much less damage, because by then there's less left to protect and fewer years left to fund.

Retirement Researcher calls the years around your retirement date the "fragile decade". With a 20-year horizon, that decade is half of the whole plan. An early downturn has a lot of weight.

That's also why one average-return projection can mislead you. It assumes the same steady return every year, and markets don't behave that way.

How bad is a "failure"?

Most studies count success as ending with at least $1. Every outcome is either a pass or a fail.

That hides a lot. A portfolio that runs dry in year 19 of a 20-year plan is a very different problem from one that runs dry in year 9. A near-miss might leave you relying on Social Security alone for a short time. An early failure could mean years of much lower income.

The reverse matters too. In most successful scenarios, a 20-year plan at a cautious rate ends with plenty left. Whether that's a good outcome depends on your goals. Maybe you want to leave money to family. Maybe you'd rather have spent it. If you're deliberately planning to spend down to zero, a short horizon with a higher rate may suit you, as long as the horizon itself is realistic.

Flexible spending can buy you a higher rate

Every number in the table assumes rigid spending: you take the same inflation-adjusted amount every year, whatever the market does. Real people rarely spend that way.

Morningstar's research has found that flexible spending strategies support a higher starting withdrawal rate than fixed ones. A common version is the guardrails approach, based on the Guyton-Klinger rules. As described by Kiplinger:

• If your current withdrawal rate drifts 20% above your target (because the portfolio fell), cut spending by 10%.
• If it drifts 20% below your target (because the portfolio grew), raise spending.

For a 20-year plan, this can matter a lot. The window is short, so a few years of smaller cuts early on can protect the plan from a bad sequence. Most of the guardrails research is written for 30-year or early retirements. It's worth testing how it works on your own shorter timeline.

Bridge strategies

If your 20 years is really a bridge to Social Security, the withdrawal rate is only part of the picture. Retirement Researcher describes building a Social Security bridge. You set aside safer assets to cover spending until benefits start, which can reduce exposure to sequence risk in those early years.

Two more things don't show up in a headline withdrawal rate:

• Taxes. Published rates are gross withdrawals. Depending on which accounts the money comes from, what you can actually spend may be noticeably less.
• Health care. Fidelity's 2025 Retiree Health Care Cost Estimate puts lifetime costs for a 65-year-old at $172,500, covering Medicare premiums, deductibles and prescriptions but not long-term care. That's a separate line item. It doesn't fit neatly inside a rule of thumb.

How to use these numbers

Treat the 4.5%–5% range as a starting point. To check it against your own situation:

1. Pick your horizon honestly. Start from your current age and think about longevity, not just the age you'd like to plan to.
2. Decide what success rate you can live with. Ninety percent is the research standard. You might want more or need less.
3. Account for other income. Social Security or a pension changes how much your portfolio has to cover, and for how long.
4. Test bad sequences. Look at what happens if the first few years go badly, not just the average case.
5. Decide in advance how you'd adjust. Know whether you'd cut spending in a downturn, and by how much.

This is where a Monte Carlo simulation helps. "Monte Carlo" just means running your plan through many possible futures, with good years and bad years in different orders, and counting how many stay funded. You get a probability instead of a single guess. It's the same kind of test behind Morningstar's 90% standard.

Run your own numbers

Published withdrawal rates tell you what works for a typical portfolio. They can't tell you what works for yours.

Our free-to-try retirement calculator takes three numbers: your age, your savings and your monthly spending. It runs them through 1,000 simulated futures and shows the share that stay funded. It runs in your browser, and nothing is saved until you choose to save it. If you want to go further, ask William, our AI planner, questions like "Is my spending sustainable?" or "Can I retire at 62?"

It's planning software, not advice. And the answer is a probability, not a promise.

Show my answer →

Frequently asked questions

What is the safe withdrawal rate for a 20-year retirement?

Most published research puts it at about 4.5% to 5% of your starting portfolio, adjusted for inflation each year. For example, the Retirement Income Journal puts a 20-year horizon with a 10% chance of failure at about 4.8%, and Bengen's historical work supported close to 5%. Forward-looking estimates tend to come in lower than historical backtests.

Can I withdraw 6% a year if I only need 20 years?

It's possible, but the odds get worse. The Poor Swiss's updated Trinity study found about 6% is the ceiling for a 20-year, inflation-adjusted retirement, and it worked only a little over 75% of the time. That's roughly 3-in-4 odds, compared with about 9-in-10 near 5%.

Is the 4% rule too conservative for a 20-year retirement?

For a true 20-year horizon, the research suggests you can usually start a bit higher than 4%. The 4% rule was built for 30-year retirements. Morningstar's 2025 base case for 30 years is 3.9%. The bigger risk is choosing a 20-year horizon when you might need your money for longer.

How do I know if 20 years is the right planning horizon?

Compare it with how long you might live, not just your expected lifespan. The Social Security Administration notes that about one in three 65-year-olds may live to at least 90. A 20-year horizon fits best if you retire at 70 or later, or if your savings only need to bridge a gap until Social Security or a pension begins.

What does a 90% success rate mean for withdrawal rates?

It means that in 90% of simulated market scenarios, for example 900 out of 1,000, the portfolio still has money left at the end of the period. In the other 10%, it runs out early. Asking for higher certainty means a lower withdrawal rate. Morningstar's 30-year rate drops from 3.9% to 2.5% at 100% success.