4 Percent Rule Alternative: Better Ways to Spend in Retirement

3.9%. That's Morningstar's safe starting withdrawal rate for 2026, a little under the famous 4%. Morningstar picks the rate that still leaves money in the account in 90% of simulated 30-year retirements, with spending held flat and adjusted for inflation each year. So if you want a 4 percent rule alternative, you have options. Most of the good ones replace a fixed rule with some flexibility, and every one of them swaps one risk for another. This guide covers how they compare, why their numbers don't agree, and how to test them against your own plan.

Source: Morningstar, The State of Retirement Income 2025 (Dec 2025), as reported by Financial Advisor magazine.

The short answer

• If you want spending that never changes, start a bit below 4%. Morningstar's 3.9% is the current benchmark.
• If you can cut back in bad years, a flexible strategy such as guardrails or dynamic spending can support a higher starting rate.
• Whichever you choose, check it against your own age, savings and spending. A single published rate answers someone else's question.

Why the 4% rule needs an alternative

The 4% rule rests on three assumptions:

1. A portfolio of roughly 60% stocks and 40% bonds.
2. Fixed spending, raised each year for inflation.
3. A retirement that lasts 30 years.

Real retirements often break at least one of these.

Length. The Social Security Administration says about one in three 65-year-olds may live to at least 90. If you retire early, or simply live a long time, 30 years may not be enough. (SSA, Retirement Information for Medicare Beneficiaries, 2026.)

Spending. Very few people spend the same inflation-adjusted amount every year for three decades. Health care alone is a big, uneven expense. Fidelity estimates a 65-year-old retiring in 2025 will need $172,500 for Medicare premiums, deductibles and prescriptions over retirement, and that figure leaves out long-term care. (Fidelity Investments, 2025 Retiree Health Care Cost Estimate, Jul 2025.)

Failure rate. In a 2016 Monte Carlo study in the Journal of Financial Planning, William Klinger found the fixed 4% rule ran out of money about 13.7% of the time, which was 1,369 failed simulations. Adding guardrails brought the failure rate down. (FPA Journal of Financial Planning, Oct 2016)

None of this makes the 4% rule useless. It's a rough guide for one kind of retirement, and the further your plan is from that kind, the less it tells you.

The main alternatives, compared

1. A lower fixed rate (3.9%, or even 3%)

This is the simplest fix. Keep the 4% rule's logic and start lower. Morningstar's 3.9% is today's reference point. Some retirees go down to 3%, especially if they expect a long retirement.

• Pros: Predictable income. Nothing to watch or adjust.
• Cons: In most futures you'll die with a lot of unspent money. That money is safety you paid for by living on less.

2. Bengen's updated 4.7%

Bill Bengen, who created the original rule, raised his figure to 4.7% for a 30-year retirement in A Richer Retirement (Wiley, Aug 2025). He calls it the "Universal Safemax." The increase comes mainly from a more diversified portfolio. It's still a worst-case number: across about 400 historical scenarios, only one needed a rate that low. (Advisor Perspectives, Aug 2025)

• Pros: Higher fixed income, based on a century of history.
• Cons: It assumes Bengen's diversified mix of assets. It also looks backward, and Bengen calls inflation the retiree's "greatest enemy."

3. Guyton-Klinger guardrails

You start with a higher withdrawal rate and set an upper and a lower limit. If your withdrawal rate rises past the upper limit because markets fell, you cut spending by 10%. If it drops below the lower limit because markets rose, you give yourself a 10% raise. In historical backtests, guardrails supported starting rates of 5.2% to 5.6% over 40 years. (Wealthtender)

• Pros: Noticeably more income at the start. A built-in response to bad markets.
• Cons: It takes more work. One critic compared the 4% rule to a bicycle and guardrails to a 747. And the pay cuts are real.

4. Dynamic spending and the "skip a raise" approaches

These include Vanguard's dynamic spending method and the simpler habit of cutting withdrawals 10% after a down year. Each limits how much your spending can move from one year to the next. You give up some of the gains in good years so you take smaller cuts in bad ones. Morningstar's research found that flexible spending can support starting rates of roughly 5.7%, compared with 3.9% for fixed spending. (Boldin)

• Pros: Smoother than full guardrails, with a higher starting rate than fixed spending.
• Cons: You still need a budget that can shrink, and the rule only works if you actually follow it.

5. Variable percentage withdrawal (VPW)

VPW comes from the Bogleheads community. Each year you withdraw a percentage of your current balance, and that percentage rises as you age and have fewer years left to fund.

• Pros: Because you always take a slice of what's there, the portfolio itself never runs dry.
• Cons: Your income moves with the market, sometimes sharply.

6. Income floor first

Under this approach, guaranteed income such as Social Security or a pension covers your essentials. You withdraw from savings only to fill the gap, or you live on dividends and interest alone.

• Pros: A market crash doesn't threaten the groceries.
• Cons: Living only on dividends and interest can leave a lot of money unspent. The approach also depends on when you claim Social Security.

At a glance

Why the numbers disagree (3.3% to 7%)

Depending on where you look, you'll find safe rates of 3.3%, 3.9%, 4%, 4.7%, 5.7% and even 7%. These figures aren't contradicting each other. They answer different questions:

• Different years. Morningstar's figure moves with market conditions: 3.3% in 2021, 3.8% in 2022, 4.0% in 2023, 3.7% in 2024 and 3.9% for 2026. If you see 3.3% quoted for 2026, it's probably the 2021 number.
• Worst case vs. average. Bengen's 4.7% is close to the worst case in history. He puts the average safe rate over the past 100 years at about 7%. That's a different statistic, and planning around it is far more aggressive.
• Fixed vs. flexible. 3.9% assumes you never cut spending. 5.7% assumes you're willing to.
• History vs. simulation. Backtests replay what actually happened. Monte Carlo tests make up thousands of plausible futures. Both are useful, and both depend on their assumptions.
• Different portfolios and time spans. Changing the asset mix or going from 30 years to 40 changes the answer.

So the useful question isn't which number is right. It's which question matches your situation.

The part most comparisons skip: the cost of flexibility

Flexible strategies raise your success rate mostly by cutting your spending when markets do badly. That's the trade you're making. A plan can show a high success rate and still put you through years of real belt-tightening.

When you look at any alternative, ask more than whether the money lasts:

• How deep can the cuts get? One 10% cut is manageable. Several in a row add up.
• How often do they happen? A cut once in 30 years feels very different from a cut every few years.
• Which expenses can actually shrink? Travel can. Medicare premiums can't.
• Does your spending fall later on? Many retirees spend less as they age, outside of health care. A plan that assumes flat spending forever may be more cautious than you need.

Which 4 percent rule alternative fits you?

Four quick questions:

1. Could you cut spending by 10% in a bad year without real hardship? If so, guardrails or dynamic spending may suit you. If not, a lower fixed rate or an income-floor approach is probably better.
2. How much of your essential spending does guaranteed income cover? The more it covers, the more variability your portfolio withdrawals can take.
3. How long does your plan need to last? If you're retiring early or planning for a long life, assume longer than 30 years.
4. Will you stick to a rule? A complicated strategy you drop during a crash can do worse than a simple one you follow.

How to test a strategy against your own numbers

This is where Monte Carlo simulation helps. In plain terms, it runs your plan through many possible futures with different market returns, good stretches and bad, and counts how many of those futures still have money at the end. The result is a probability, not a single projection based on average returns.

It's the same test behind Morningstar's 3.9%, and you can run it on your own numbers. Monte Climb's free retirement calculator needs three inputs: your age, your retirement savings and your monthly spending. It runs them through 1,000 simulated futures and shows the share that stay funded. Plans run to age 95 by default, and you can extend them, so a long life is part of the test from the start. The engine also charges Medicare premiums and income-based surcharges year by year instead of using one flat guess.

If you want to dig further, you can ask William, our AI planner, things like "Am I on track?", "Can I retire at 62?" or what a sustainable spending level looks like. William shows his work, so you can see why the answer is what it is. It runs in your browser and nothing is saved until you say so. It's planning software, not advice, and the result is a probability, not a promise.

The bottom line

No single 4 percent rule alternative is the best one. The right choice depends on how long your money has to last, how much guaranteed income you have and how much flexibility you can live with. Start with real numbers.

Three numbers. One clear answer. Show my answer →

Frequently asked questions

What is the best alternative to the 4 percent rule?

No one strategy is best for everyone. If you want fixed spending, a slightly lower rate such as Morningstar's 3.9% for 2026 is the current benchmark. If you can cut spending in bad years, flexible approaches such as Guyton-Klinger guardrails or dynamic spending have supported higher starting rates in research.

Is the 4% rule still safe in 2026?

It's close. Morningstar's 2026 safe starting withdrawal rate is 3.9%, based on money lasting in 90% of simulated 30-year retirements with fixed, inflation-adjusted spending. A longer retirement, a different portfolio or uneven spending can change that a lot.

Why did Bill Bengen raise the 4% rule to 4.7%?

In his 2025 book A Richer Retirement, Bengen raised his worst-case rate for a 30-year retirement to 4.7%, mainly because he now assumes a more diversified portfolio. He calls it the Universal Safemax, a near worst-case figure drawn from about 400 historical scenarios.

How do Guyton-Klinger guardrails work?

You start with a higher withdrawal rate and set an upper and a lower limit. If your withdrawal rate rises past the upper limit after markets fall, you cut spending by 10%. If it drops below the lower limit after markets rise, you raise spending by 10%. Historical backtests found starting rates of 5.2% to 5.6% over 40 years.

How can I test a withdrawal strategy on my own savings?

A Monte Carlo simulation runs your plan through many possible market futures and reports how often your money lasts. Monte Climb's free calculator does this with your age, savings and monthly spending across 1,000 simulated futures, and plans run to age 95 by default.