Safe Withdrawal Rate for 30-Year Retirement: Is It 3.9%?

3.9%. If you're looking for a safe withdrawal rate for 30-year retirement planning, that's the current headline number. Morningstar's research says you can start by withdrawing 3.9% of your portfolio, raise that dollar amount with inflation each year, and still have money left after 30 years in 90% of simulated futures. On a $1 million portfolio, that's about $39,000 in year one, before Social Security or any pension.

That's the short answer. The longer answer is that 3.9% rests on specific assumptions, other credible researchers reach different numbers, and the inputs that matter most are ones only you know. Here's how it breaks down.

Safe withdrawal rate for a 30-year retirement: 3.9%, with conditions

The figure comes from Morningstar's The State of Retirement Income 2025 report, published December 2025. The base case behind Morningstar's 3.9% assumes:

• A 30-year retirement.
• A 90% success target. "Success" means the money hasn't run out by year 30.
• A portfolio with 30% to 50% in stocks, with the rest mostly in bonds and cash.
• Fixed, inflation-adjusted withdrawals. You take the same real amount every year no matter what markets do.

The prior year's report put the number at 3.7%. Morningstar attributed most of the increase to modestly higher expected returns. Notice what that tells you: this is a forward-looking estimate, and it moves as forecasts move. Morningstar usually updates it each December, so check for a newer figure if you're reading this after the next report comes out.

The dollar math is simple:

Social Security, pensions, and any other income come on top of these amounts.

Why the experts disagree: 3.9% vs. 4% vs. 4.7%

Search this topic and you'll see 3.9%, 4%, and 4.7%, sometimes in the same article. TheStreet laid out the split between Fidelity, Morningstar, and Bengen. Most articles stop at listing the numbers. The thing they rarely say is that these figures come from different methods answering different questions.

Some plain-English definitions:

• Monte Carlo simulation means running your plan through many possible market futures, each one randomly generated from assumptions about returns and volatility. Then you count how many of them work. It answers: if the future looks like today's forecasts, how often does this hold up?
• Bengen's historical approach asks a different question: what is the highest rate that survived every 30-year stretch in the past, including the worst one? He calls diversification and rebalancing "free lunches." His move from 4.15% to 4.7% comes mainly from adding them.
• The Trinity Study found that a 4% inflation-adjusted withdrawal held up in most historical 30-year periods for balanced and stock-heavy portfolios. It did noticeably worse for bond-heavy portfolios, and success fell sharply when the rate rose to 5%.

None of these numbers is wrong. Each one answers its own question. The real question is which one is closest to yours.

What a 90% success rate doesn't tell you

"90% success" sounds tidy, but it hides two things.

How badly the failures fail

The failing 10% aren't all alike. A path where the money runs out in year 29 is a very different retirement from one where it runs out in year 22. A pass/fail rate counts both the same way. If your plan fails in some futures, you want to know when the money runs short and by how much, so you know what you'd have to change.

The money you didn't spend

The other side of the risk gets almost no attention. A rate built to survive bad markets will often leave a large balance unspent when markets are ordinary or good. That's comforting if you want to leave an inheritance. It's a real cost if you'd rather have traveled while you were healthy. A cautious rate protects you from running out, and part of the price is spending less than you could have.

Why the first decade matters most

Both risks come mostly from sequence-of-returns risk. That's the danger of bad returns arriving early, while you're also pulling money out. A downturn in years one through ten does far more damage than the same downturn in year 25, because you sell more shares at low prices and those shares aren't there for the recovery.

The inputs that move your number

The 3.9% figure is a starting point built on generic assumptions. Change any of these and your sustainable rate changes too.

How long you plan for. In Morningstar's research, retiring five years later, which shortens the horizon from 30 years to 25, raised the safe starting rate to 4.1%. The opposite also holds: a longer horizon means a lower rate. That matters because 30 years may not be enough. According to the Social Security Administration (Retirement Information for Medicare Beneficiaries, 2026), about one in three 65-year-olds may live to at least 90. If you retire at 62, 30 years gets you to 92.

How you invest. Allocation changes the answer. The historical studies show bond-heavy portfolios holding up worse over 30 years than balanced ones.

Whether you can flex. The 3.9% figure assumes you never adjust your spending. Morningstar tested flexible approaches that cut spending after bad years and raise it after good ones. Some of those strategies supported starting rates as high as about 5.7%.

Fees and taxes. A withdrawal rate is a gross number. Fund fees, advisory fees, and income taxes all come out of it, so what you can actually spend is lower than the headline rate.

Health care. Fidelity's 2025 Retiree Health Care Cost Estimate (July 2025) puts lifetime health care costs for one 65-year-old at $172,500 in Medicare premiums, deductibles, and prescriptions. That figure doesn't include long-term care. It's a major line item, and it doesn't stay flat year to year.

Social Security timing. If you delay claiming, your portfolio covers the years before benefits start, so early withdrawals run higher. When benefits begin, they can reduce how much you need from savings. Your withdrawal rate doesn't stay the same across retirement.

How your spending changes. Real retirees rarely spend the same inflation-adjusted amount for 30 years. Spending often changes with health, travel, and age, and a fixed-withdrawal model doesn't capture that.

Guardrails, worked through with numbers

Many articles mention "guardrails," meaning rules that cut spending when the portfolio falls too far and raise it when the portfolio grows. Few show how the numbers play out. Here's a simplified, hypothetical illustration. It isn't any specific published method, and it ignores inflation to keep the arithmetic clear.

1. Start: $1,000,000 portfolio. You withdraw $39,000 (3.9%), leaving $961,000.
2. Bad first year: markets fall 20%. The portfolio drops to $768,800.
3. Check the guardrail: a $39,000 withdrawal is now about 5.1% of the portfolio. Say your rule is to cut 10% if your current rate climbs more than 20% above where you started (3.9% × 1.2 = 4.68%). You've crossed that line.
4. Adjust: cut spending 10%, from $39,000 to $35,100. That brings your rate down to about 4.6%.

The cut is $3,900 a year, which is real but manageable for many households. It also leaves more of your money invested for the recovery, right when sequence risk is highest. That's why flexible approaches can support higher starting rates. You accept occasional pay cuts in exchange for a bigger starting paycheck.

The trade-off is your own call. Some people would rather start lower and never cut. Others would rather start higher and adjust. Neither choice is wrong, but you should make it on purpose.

How to use this for your own plan

You can treat 3.9% as a reference point. Your own plan should be built from your own numbers. A practical way to approach it:

1. Start with your real spending. EBRI's 2025 Retirement Confidence Survey found that only 52% of workers have estimated the monthly income they'll need in retirement. That estimate comes first.
2. Plan past 30 years if you retire in your early 60s. Longevity is the risk that's easiest to underestimate.
3. Decide how flexible you're willing to be. A fixed rate and a guardrail rate are different plans.
4. Look at the whole range of outcomes, including how bad the failures are and how much money the successes leave unspent, and not just one success percentage.
5. Stress-test it. Try a bad first decade, higher health care costs, and a longer life.

This is exactly what Monte Climb's in-browser retirement calculator is built to do. You enter three numbers: your age, your retirement savings, and your monthly spending. We run them through 1,000 simulated futures and show what share of them stay funded. Plans run to age 95 by default, and you can extend them further. Our AI planner, William, can walk you through questions like "Am I on track?" or "What's a sustainable spend?" and he shows his work. It's planning software, not advice, and the result is a probability, not a promise.

Three numbers. One clear answer. Show my answer and see how your own plan compares to the 3.9% benchmark.

Frequently asked questions

What is the safe withdrawal rate for a 30-year retirement in 2026?

Morningstar's State of Retirement Income 2025 report (December 2025) puts it at 3.9%. That assumes a 90% chance of money remaining after 30 years, a portfolio with 30–50% in stocks, and fixed inflation-adjusted withdrawals.

Is the 4% rule still safe?

It depends on which question you're asking. Bengen's original historical research produced 4.15%, rounded to 4%. His updated work with more diversification and annual rebalancing supports 4.7%. Morningstar's forward-looking simulations give 3.9%. The methods differ, so the numbers differ.

How much can I withdraw from $1 million at a 3.9% rate?

About $39,000 in the first year, then that amount adjusted for inflation each year after. Social Security, pensions, and other income come on top.

Does retiring later raise my safe withdrawal rate?

Generally, yes. In Morningstar's research, shortening the horizon from 30 to 25 years by retiring five years later raised the safe starting rate to 4.1%.

Can flexible spending let me withdraw more?

Yes. Morningstar found that flexible strategies, which cut spending after bad years and raise it after good ones, can support starting withdrawal rates of up to about 5.7%. In exchange, your income changes from year to year.