Is the 4% Rule Still Safe in 2026? A Withdrawal Rate Guide

In 1994, financial planner William Bengen published research in the Journal of Financial Planning that changed how millions of Americans think about retirement spending. His analysis of historical market data suggested that a retiree who withdrew 4% of their portfolio in the first year of retirement, then adjusted that amount for inflation each year, had a strong likelihood of not running out of money over a 30-year period. That finding became known as the 4% rule, and it has been the default starting point for retirement planning ever since.

But a lot has changed in 30 years. Interest rates, market valuations, life expectancy, and the very structure of retirement have all shifted. A growing number of researchers and financial planners are asking whether the 4% rule is still the right benchmark, or whether it needs to be updated for the realities retirees face today. Using a retirement withdrawal rate calculator to model different scenarios is one of the most practical ways to explore this question for your own situation.

This article walks through what the research actually says, runs real numbers on a hypothetical $1 million portfolio at withdrawal rates of 3%, 3.5%, 4%, and 5%, and introduces a more flexible modern approach called the guardrails method. By the end, you will have a much clearer picture of how to think about sustainable spending in retirement.

One of the most useful things a safe withdrawal rate calculator can do is translate percentages into real dollars. Abstract numbers become much more meaningful when you see what they mean for your monthly budget. Consider a hypothetical retiree with a $1 million portfolio. Here is what each withdrawal rate produces in the first year, before any inflation adjustment:

• 3% withdrawal rate: $30,000 per year, or $2,500 per month
• 3.5% withdrawal rate: $35,000 per year, or about $2,917 per month
• 4% withdrawal rate: $40,000 per year, or about $3,333 per month
• 5% withdrawal rate: $50,000 per year, or about $4,167 per month

The gap between the most conservative and most aggressive rate is $20,000 per year. That is a meaningful difference in lifestyle, but the more important question is: which rates have historically held up, and under what conditions do they fail?

Bengen's original research, based on U.S. market data going back to 1926, found that a 4% rate survived every 30-year rolling period in the historical record, including retirement years that began right before major crashes. However, that analysis assumed a portfolio allocated roughly equally between U.S. stocks and bonds, and it was modeled on 30-year retirements. If you retire at 60 and live to 95, you are looking at a 35-year horizon, and the math shifts noticeably. It is also worth noting that past market performance does not guarantee future results, and current conditions, including lower expected bond returns and higher equity valuations compared to historical averages, have led many researchers to revisit those original conclusions.

If you want to see how different rates interact with your specific savings, Social Security income, and expected expenses, our retirement income calculator lets you model whether your savings are likely to last 30 years or more.

The most widely discussed recent challenge to the 4% rule comes from research published by Morningstar. In their 2021 paper The State of Retirement Income: Safe Withdrawal Rates, researchers Amy Arnott, Christine Benz, and Jeffrey Ptak estimated that a 3.3% withdrawal rate was more appropriate for a 30-year retirement horizon, given the lower expected returns on bonds at the time of writing. Their analysis used a Monte Carlo simulation approach, which models thousands of possible market sequences rather than relying solely on historical averages.

It is important to understand what that 3.3% figure actually means. It does not mean 4% will definitely fail. It means that, under assumptions about future market returns that are more conservative than the historical record, a 3.3% rate offered a high probability of portfolio survival over 30 years. For a 35- or 40-year retirement, the research generally points to even lower rates as the starting point for a conservative plan.

For early retirees, those leaving the workforce in their late 50s or even earlier, the math is particularly demanding. A longer runway means more years of withdrawals compounding against you in a bad sequence of returns. Someone who retires at 58 and lives to 93 has a 35-year retirement. A portfolio that would have survived comfortably over 30 years may face real stress over 35, especially if the first decade of returns is poor, a risk known as sequence of returns risk.

Morningstar's more recent research has indicated that as interest rates rose in 2022 and 2023, the picture improved somewhat, with updated estimates suggesting rates closer to 3.8% or higher may be defensible depending on portfolio construction. The key takeaway is not a single magic number, but an understanding that the appropriate rate depends on your time horizon, your portfolio mix, and your willingness to adjust spending if markets underperform.

Understanding how inflation interacts with all of this is equally important. Our post on why $1M may not be enough by 2040 explores the long-term purchasing power challenge that every retiree faces, regardless of their chosen withdrawal rate.

One of the biggest limitations of any fixed withdrawal rate is its rigidity. Life is not rigid. Markets go up and down, spending needs change, and unexpected expenses arise. The guardrails approach, developed by financial planner Jonathan Guyton and researcher William Klinger and published in the Journal of Financial Planning in 2006, addresses this by building flexibility directly into the withdrawal strategy.

The core idea is that instead of committing to a fixed withdrawal amount that increases with inflation every year no matter what, retirees set upper and lower guardrails around their portfolio. If spending as a percentage of the current portfolio rises above a certain ceiling (because the portfolio has fallen), spending is reduced by a set amount, often around 10%. If the portfolio grows so much that the withdrawal rate drops below a lower floor, spending can be increased.

Here is a simplified example using a hypothetical retiree starting with a $1M portfolio and an initial 4% withdrawal ($40,000 per year):

• Upper guardrail: If the portfolio drops and the withdrawal rate climbs above 5.5% of the current balance, spending is reduced by 10% (to $36,000 in this example).
• Lower guardrail: If the portfolio grows and the withdrawal rate drops below 3.5% of the current balance, spending can increase by 10% (to $44,000).

Research on the guardrails approach has generally found that it allows retirees to start with a higher initial withdrawal rate than a purely fixed strategy while still maintaining strong portfolio survival rates over long time horizons. The tradeoff is accepting some variability in your annual spending, which not everyone is comfortable with or able to manage given fixed obligations like mortgage payments or healthcare costs.

Thinking through how you will handle spending flexibility is part of building a complete retirement budget. Our retirement budget calculator can help you identify which expenses are truly fixed and which have room to flex.

Here is something that does not always get enough attention in withdrawal rate discussions: the rate you withdraw from your portfolio and the amount you actually get to spend are not the same thing, because taxes apply differently depending on where your money is held.

If your retirement savings are primarily in a traditional 401(k) or traditional IRA, every dollar you withdraw is taxed as ordinary income in the year you take it. That means a 4% withdrawal from a $1M traditional IRA does not produce $40,000 of spending money. After federal income taxes, the net amount will be lower, depending on your total income and tax bracket. You would need to withdraw more than $40,000 to clear $40,000 after taxes, which functionally raises your real withdrawal rate.

Roth IRA withdrawals, by contrast, are generally tax-free in retirement, provided the account has been open for at least five years and you are 59½ or older. A thoughtful mix of traditional and Roth accounts gives retirees more control over their taxable income in any given year, which can help manage not just income taxes but also the taxation of Social Security benefits and Medicare premium surcharges known as IRMAA (Income-Related Monthly Adjustment Amount).

There is also the matter of Required Minimum Distributions. Starting at age 73 under current IRS rules, retirees must begin taking minimum withdrawals from traditional IRAs and 401(k)s each year, based on IRS life expectancy tables. These RMDs may push your effective withdrawal rate higher than you planned, particularly if your portfolio has grown significantly. For a detailed breakdown of how RMDs are calculated and what they mean for your income plan, our RMD calculator guide walks through the process step by step.

The practical implication is that your sustainable withdrawal rate cannot be evaluated in isolation from your tax situation. A withdrawal strategy that looks safe on paper may look quite different once federal and state taxes, Medicare premiums, and RMD requirements are factored in.

A few persistent myths tend to make retirement withdrawal planning harder than it needs to be.

Misconception 1: The 4% rule guarantees your money will last. It does not guarantee anything. It describes a rate that has historically survived in most 30-year scenarios using a specific portfolio mix and U.S. market data. It is a useful starting point, not a promise.

Misconception 2: You need to stick with your initial withdrawal rate forever. Most retirees naturally spend more in their early, active retirement years and less as they age. Research published by David Blanchett, then at Morningstar, described a pattern of retirement spending that often follows a curve, higher early on, declining in real terms through the mid-retirement years, then potentially rising again late in life due to healthcare costs. A rigid fixed rate ignores this natural spending pattern.

Misconception 3: A lower withdrawal rate is always safer. It depends on what you value. Withdrawing 3% from a $1M portfolio means living on $30,000 per year from savings, plus Social Security and any other income. For some retirees, that means unnecessarily constrained spending and potentially leaving a much larger estate than intended. Being too conservative has its own costs.

Misconception 4: Social Security is separate from the withdrawal rate calculation. It should not be. Social Security income reduces how much you need to withdraw from your portfolio each year. A retiree receiving $24,000 per year from Social Security who needs $60,000 total only needs to pull $36,000 from savings, which is a 3.6% withdrawal rate on a $1M portfolio, not 6%. Building your full income picture, including Social Security, pensions, and any part-time earnings, is essential to understanding your actual portfolio withdrawal need.

Disclaimer: This article is for general educational purposes only and does not constitute personalised financial, tax, or investment advice. Fidser is not a registered investment adviser or financial planning firm. The scenarios and examples presented are hypothetical and illustrative only. Individual circumstances vary significantly. Please consult a qualified financial adviser, tax professional, or retirement planner before making any decisions about your withdrawal strategy or retirement income plan.