The 4% Rule for Retirement Withdrawals: Does It Work?

The 4% rule says to withdraw 4% of your retirement portfolio in the first year, then increase the dollar withdrawal with inflation in later years rather than repeatedly taking 4% of the current balance. William Bengen’s original historical analysis found that this approach supported at least 30 years of withdrawals across the U.S. historical periods he tested when used with a diversified stock-and-bond portfolio. That does not make 4% a guaranteed safe rate today. Current research produces different starting rates depending on return assumptions, portfolio mix, retirement length, success target, and spending method. Morningstar’s 2026 retirement-income research estimates 3.9% for its base-case fixed inflation-adjusted approach, while flexible strategies can support different spending patterns. Use 4% as a planning reference, then test your own retirement horizon, taxes, fees, Social Security, portfolio allocation, and ability to reduce spending after weak markets.

The 4% rule is one of the most quoted ideas in retirement planning because it turns a complicated question into simple arithmetic.

If you retire with $1 million, 4% is $40,000. Withdraw $40,000 in the first year, increase that dollar amount with inflation each year, and the portfolio is supposed to support a long retirement.

The simplicity is useful. It is also the reason the rule is often misunderstood.

The original research did not prove that every retiree can spend exactly 4% safely. It tested a specific withdrawal method against historical U.S. market and inflation data. Change the retirement length, investments, spending pattern, fees, taxes, or future returns and the result can change too.

Key Takeaways

The 4% rule is a first-year withdrawal rule: Later withdrawals are based on the original dollar amount adjusted for inflation, not 4% of each year’s portfolio balance.
It came from historical testing: William Bengen examined U.S. stock, Treasury, and inflation history rather than guaranteeing future returns.
The original goal was portfolio longevity: Bengen used a 30-year minimum retirement horizon as a central planning threshold.
Sequence risk matters: Poor returns and high inflation early in retirement can be much more damaging than the same average returns arriving in a different order.
Current estimates can differ from 4%: Morningstar’s 2026 base-case research estimates a 3.9% starting rate for a fixed inflation-adjusted strategy under its assumptions.
Flexibility changes the math: Retirees willing to reduce spending after weak markets may be able to use different withdrawal strategies than someone requiring a fixed inflation-adjusted paycheck.
Taxes and fees are not optional: A portfolio withdrawal is not always the same as spendable income.
Your time horizon matters: A retiree planning for 40 years should not automatically use the same assumptions as someone planning for 25 or 30 years.

What the 4% Rule Actually Says

The classic rule uses the portfolio value at the beginning of retirement to establish the first withdrawal.

First-year withdrawal = Starting retirement portfolio × 4%

Example: You retire with $800,000.

First-year withdrawal: $800,000 × 4% = $32,000.

If inflation were 3% during the first year, the second-year withdrawal under the classic approach would increase to approximately $32,960. You would not simply calculate 4% of the new portfolio balance.

This distinction matters.

A strategy that withdraws 4% of the current portfolio every year behaves differently. When investments fall, the dollar withdrawal falls. When the portfolio rises, the withdrawal rises. That approach reduces the risk of mathematically exhausting the portfolio but creates much more variable spending.

The classic 4% rule tries to provide a steadier inflation-adjusted lifestyle. The portfolio absorbs more of the market variability instead of passing all of it directly into annual spending.

Where the Rule Came From

Financial planner William Bengen published the research that became associated with the 4% rule in the Journal of Financial Planning in 1994.

His analysis tested retirement withdrawals against historical U.S. investment returns and inflation. One of the central examples used a portfolio of 50% common stocks and 50% intermediate-term Treasury securities, rebalanced over time.

The withdrawal method was:

choose a percentage of the starting portfolio;
withdraw that dollar amount during the first year;
increase subsequent dollar withdrawals with inflation; and
measure how long the portfolio lasted across different historical retirement start dates.

Bengen reported that a 4% first-year withdrawal followed by inflation adjustments did not exhaust the tested 50/50 portfolio before roughly 33 years in the historical scenarios he analyzed. He therefore treated 4% as a reasonable ceiling for someone seeking at least about 30 years of portfolio longevity.

He also stressed that historical averages alone were not enough. A retirement beginning near severe market losses and high inflation could have a very different result from one enjoying strong early returns.

The original rule was not “earn an average return above 4%, therefore 4% is safe.” Bengen’s work focused on the actual order of historical returns and inflation because bad years early in retirement can damage a withdrawal plan even when long-term averages look acceptable.

Why Sequence of Returns Can Break a Withdrawal Plan

Investment returns are not received as one smooth annual average.

Imagine two retirees who both experience the same set of returns over 20 years, but in reverse order.

Retiree A receives strong returns early and weak returns later.
Retiree B receives the weak returns immediately after retirement and stronger returns later.

If neither person were withdrawing money, the order might have a much smaller effect on the final compounded result.

During retirement, withdrawals change the outcome. Retiree B must sell assets while the portfolio is already depressed. Those shares are no longer invested when the later recovery occurs.

Illustration: A portfolio falls sharply during the first two years of retirement while the retiree continues withdrawing an inflation-adjusted dollar amount. The portfolio now has two pressures at once: market losses and withdrawals. Even if returns improve later, fewer assets remain to participate in the recovery.

Vanguard describes this as sequence-of-returns risk and uses it as one reason to consider spending methods that allow some adjustment after market declines.

This risk is one of the strongest arguments against treating the retirement paycheck as permanently fixed regardless of portfolio conditions.

Does the 4% Rule Still Work Today?

It still works well as a planning benchmark. It is not a universal current safe-withdrawal guarantee.

Modern retirement research can produce starting withdrawal rates above or below 4% because the answer changes with the assumptions.

Morningstar’s State of Retirement Income research for 2026 estimates a 3.9% starting safe withdrawal rate for its base-case approach to consistent inflation-adjusted spending. That estimate reflects Morningstar’s own capital-market assumptions, portfolio modeling, retirement horizon, and probability-of-success framework.

The difference between 3.9% and 4% is small enough to make an important point: the 4% rule remains in the neighborhood of serious contemporary research, but the exact decimal is not timeless.

Approach	What the number represents
Bengen historical framework	A starting withdrawal tested against historical U.S. returns and inflation, with later withdrawals adjusted for inflation
Current forward-looking research	A starting withdrawal derived from modeled future returns, inflation, portfolio mixes, retirement length, and chosen success criteria
Your retirement plan	The amount your specific spending, income, assets, taxes, timeline, and flexibility can support

Do not interpret a research estimate of 3.9% as proof that 4.0% is dangerous, or 4% as proof that 4.5% is reckless. Small changes in assumptions can move the recommended starting rate.

The correct lesson is that withdrawal rates are outputs of a retirement plan, not laws of nature.

Your Retirement Length Can Matter More Than the Rule

The original 4% framework is commonly associated with a retirement of roughly 30 years.

That may fit someone retiring at 65 and planning through their mid-90s. It can be much less comfortable for someone retiring at 50 or 55.

A longer withdrawal horizon creates several additional pressures:

more years of spending;
more exposure to inflation;
more opportunities for severe bear markets;
more uncertainty around health and long-term care;
fewer working years in which to rebuild savings; and
a stronger need for long-term portfolio growth.

The opposite is also true. Someone beginning retirement much later, with strong Social Security or pension income and a shorter expected portfolio horizon, may not need the same withdrawal assumptions as a 55-year-old early retiree.

This is why the withdrawal rate should follow the retirement timeline rather than the other way around.

If you are considering a long retirement, the earlier early-retirement guide explains how health coverage, Social Security timing, and account access create additional bridge years before the traditional retirement milestones.

Portfolio Mix Changes What a Withdrawal Rate Means

A 4% withdrawal from a portfolio that is almost entirely cash is not economically equivalent to a 4% withdrawal from a diversified stock-and-bond portfolio.

The asset mix influences:

expected long-term return;
volatility;
inflation protection;
the severity of short-term losses;
how often the portfolio must be rebalanced; and
how much sequence risk the retiree can tolerate.

Bengen’s original examples showed that portfolios with too little stock exposure could struggle to generate enough long-term growth, while very high stock exposure increased vulnerability to severe market declines.

His historical work found the strongest minimum portfolio longevity in a broad zone around 50% to 75% stocks under the assumptions he tested, rather than proving that one exact allocation is optimal for every retiree.

Current research may use different capital-market assumptions and portfolio allocations.

The important point is that the withdrawal rate and investment strategy cannot be designed independently. A retiree cannot safely raise the expected return in a spreadsheet, take more investment risk, and assume the higher withdrawal is now guaranteed.

More stocks do not automatically mean a higher safe withdrawal rate. Stocks can improve long-term growth but also increase short-term volatility. A severe decline near the beginning of retirement can be particularly damaging when withdrawals are already underway.

Taxes and Fees Can Make 4% Feel Like Less

The 4% rule describes portfolio withdrawals, not necessarily the amount available to spend after taxes and costs.

Example: A retiree with $1 million uses a 4% starting withdrawal and takes $40,000. If most of the withdrawal comes from a pre-tax Traditional IRA or 401(k), part or all of the distribution can be included in federal taxable income. The retiree does not necessarily have the full $40,000 available for household spending.

Your retirement-income plan may also include:

investment expense ratios;
advisory or management fees;
account fees;
federal income tax;
state income tax; and
tax interactions with Social Security and other income.

If the household needs $60,000 after tax from the portfolio, calculating 4% of $1.5 million and concluding that the problem is solved can understate the required gross withdrawal.

Build the withdrawal around the net retirement budget, then decide which retirement accounts to use and calculate the gross distribution required from each account.

The retirement-income guide explains how to coordinate Social Security, pensions, cash, portfolio distributions, and tax withholding into a practical monthly paycheck.

Flexible Spending Can Be More Powerful Than Finding the Perfect Percentage

The classic rule values spending stability. You increase the withdrawal with inflation even when the portfolio has a bad year.

That is useful for budgeting, but many retirees do not spend with perfect rigidity.

A flexible strategy can respond to markets.

For example:

reduce discretionary spending after a major decline;
skip an inflation increase after a weak year;
postpone a large vacation or vehicle purchase;
spend somewhat more after strong portfolio growth; or
set upper and lower limits on annual withdrawal changes.

Vanguard’s dynamic-spending research illustrates a method that allows withdrawals to move within a ceiling and floor rather than mechanically applying full inflation increases every year. The goal is to balance spending stability with portfolio sustainability.

Withdrawal style	Main advantage	Main trade-off
Fixed dollar plus inflation	Stable purchasing-power target	Can ignore portfolio weakness
Fixed percentage of current portfolio	Withdrawal automatically falls when portfolio falls	Income can fluctuate sharply
Dynamic or guardrail approach	Allows controlled spending adjustments	Requires more annual decisions and willingness to change spending

Flexibility does not make every withdrawal rate safe. It gives the plan another lever when reality differs from the original assumptions.

Do Not Confuse the 4% Rule With Required Minimum Distributions

Required minimum distributions and retirement withdrawal rules solve different problems.

The 4% rule is a personal spending framework.

An RMD is a federal tax requirement that eventually requires owners of many tax-deferred retirement accounts to distribute at least a calculated amount after reaching the applicable starting age.

Your RMD may be:

less than what you need to spend;
close to your planned portfolio withdrawal; or
more than you actually need for current expenses.

If an RMD exceeds your spending need, the excess does not have to be consumed. After satisfying the distribution and paying applicable tax, money can generally be saved or reinvested in a taxable account if that fits the plan.

Likewise, using a 4% spending rule does not exempt you from RMD requirements when they apply.

The next articles in this retirement-planning cluster address RMDs and account-withdrawal sequencing separately because those tax decisions should not be compressed into one withdrawal percentage.

How to Use the 4% Rule Without Treating It as a Promise

The rule is most useful as the first stress test in a larger process.

Calculate the portfolio spending gap. Subtract Social Security, pensions, and other dependable income from the retirement budget.
Divide the first-year portfolio need by the portfolio balance. This shows the withdrawal rate your lifestyle is actually demanding.
Compare it with 4%. Use the rule as context rather than an approval threshold.
Test a lower starting rate. See what spending or saving changes would be required.
Test a higher-cost retirement. Add health, housing, tax, and irregular-expense uncertainty.
Extend the time horizon. Particularly important for early retirement.
Model bad early returns. Determine which expenses would be reduced if markets fall soon after retirement.
Include taxes and fees. Compare gross withdrawals with the amount actually available to spend.
Choose a spending policy. Decide whether withdrawals will be rigid, percentage-based, or adjusted within guardrails.
Review annually. Recalculate after major market moves, spending changes, or new income sources.

Example: Your portfolio is $1.2 million and the retirement budget requires $72,000 after dependable income is counted. The portfolio gap is $48,000 before tax, exactly 4% of the starting balance.

Instead of stopping there, test what happens if the gap becomes $55,000, the first two years deliver poor returns, retirement lasts 35 years, or taxes require a larger gross withdrawal. Then decide whether spending flexibility, additional cash, a later retirement date, or another income source gives the plan enough margin.

The Retirement Income Calculator can help compare different starting balances, spending levels, and retirement horizons. If much of the portfolio is in a workplace plan, the 401(k) Withdrawal Calculator can also test how long that balance may last under different withdrawal assumptions.

The 4% rule survives because it asks a useful question in a simple way. It does not survive as a guarantee that one number works for every portfolio and every retirement.

Frequently Asked Questions (FAQs)

What is the 4% rule for retirement?

The classic 4% rule starts by withdrawing 4% of the retirement portfolio during the first year, then adjusting the dollar withdrawal for inflation in later years. It is not the same as withdrawing 4% of the current portfolio balance every year.

Does the 4% rule still work?

It remains a useful retirement-planning benchmark, but 4% is not guaranteed to be safe for every retiree. Retirement length, market returns, inflation, portfolio allocation, taxes, fees, spending flexibility, and other income can justify a different starting withdrawal.

What is a safe withdrawal rate in 2026?

There is no universal safe rate. Morningstar’s 2026 retirement-income research estimates 3.9% for its base-case fixed inflation-adjusted spending approach under its modeling assumptions. Other methods and assumptions can produce different rates.

Does the 4% rule include Social Security?

The rule applies to withdrawals from an investment portfolio. Social Security and pensions should generally be modeled separately. Subtract dependable income from retirement spending first, then calculate how much the portfolio actually has to provide.

Does the 4% rule include taxes?

Not automatically. A 4% gross portfolio withdrawal can produce less spendable income after federal and state taxes, particularly when money comes from pre-tax retirement accounts. Include taxes in the retirement cash-flow plan.

Is 4% too high for early retirement?

It can be. Early retirement can require the portfolio to support spending for much longer than the roughly 30-year horizon commonly associated with the classic rule. Test longer horizons and lower starting withdrawals rather than assuming the same rate applies.

Should I increase my withdrawal with inflation every year?

The classic rule does, but you do not have to use a rigid inflation adjustment. A flexible or dynamic spending strategy can reduce or skip increases after weak markets and permit more spending after stronger results, subject to the rules you establish.

Can I spend more than 4% if the market is doing well?

You can design a strategy that permits higher spending after strong portfolio performance, but raising spending permanently after a few good years can weaken long-term sustainability. Define a rule for increases and reductions rather than reacting to one year’s return.

Sources