What is the 4% rule for retirement? How it works in 2026

The 4% rule says you withdraw 4% of your retirement portfolio in the first year, then increase that dollar amount with inflation each year. It was designed as a planning guideline for roughly a 30-year retirement, not a guarantee that your money cannot run out.

For example, with a $1 million portfolio, the rule starts you at $40,000 in year one. If inflation is 3%, year two’s withdrawal becomes $41,200. You do not simply withdraw 4% of whatever your portfolio happens to be worth each year.

The rule remains a useful starting point, but current research reinforces why 4% should not be treated as a universal number. Morningstar’s latest U.S. retirement-income research for 2026 estimates a 3.9% starting rate for a 30-year retirement under its fixed, inflation-adjusted spending framework and a 90% success target. A 40-year horizon lowers its comparable estimate to about 3.3%.

Key takeaways

• The 4% rule is an initial withdrawal rule. Take 4% in year one, then adjust the dollar amount for inflation.
• It was built around a roughly 30-year retirement, not a 50-year FIRE retirement.
• The rough FIRE shortcut is 25 times the annual spending your portfolio needs to fund.
• Current research does not prove that 4% is wrong. Morningstar’s 2026 baseline is close at 3.9% for 30 years, but longer horizons require more caution.
• For a 40-year retirement, Morningstar’s comparable base-case rate is about 3.3%, which is closer to 30 times portfolio-funded spending.
• Sequence-of-returns risk is one of the biggest threats: poor markets early in retirement can do much more damage than the same losses later.
• Taxes, fees, portfolio allocation, retirement length, other income, and your ability to reduce spending can all change the appropriate rate.

What is the 4% rule?

The 4% rule is a retirement withdrawal strategy built around maintaining approximately the same purchasing power each year.

The basic formula is:

First-year withdrawal = starting portfolio × 4%

After the first year, forget the 4% calculation and adjust the previous year’s dollar withdrawal for inflation.

Suppose you retire with $1,000,000.

Your first three years might look like this if inflation runs at 3% annually:

Year	Withdrawal
Year 1	$40,000
Year 2	$41,200
Year 3	$42,436

Notice that year two’s withdrawal is not calculated as 4% of your new portfolio balance.

If your investments fell from $1 million to $850,000 after year one, the classic rule would still call for the inflation-adjusted $41,200 withdrawal.

That rigid spending approach is one reason the rule can become risky after a bad market.

Where did the 4% rule come from?

Financial planner William Bengen published the research behind the rule in 1994 in the Journal of Financial Planning.

Bengen tested historical U.S. stock, bond, and inflation data beginning in 1926. With his assumptions, a 4% initial withdrawal followed by inflation-adjusted spending did not exhaust the modeled portfolio before roughly 33 years in the worst historical case he studied.

Interestingly, Bengen found that approximately 3% to 3.5% had survived at least 50 years across the historical periods he tested. That is useful context for people considering much longer retirements.

The 1998 study by Philip Cooley, Carl Hubbard, and Daniel Walz, now widely known as the Trinity Study, tested different withdrawal rates, portfolio allocations, and retirement periods using U.S. historical data from 1926 through 1995.

In its original results, a 4% inflation-adjusted withdrawal succeeded in 100% of the tested 30-year periods for both 50/50 and 75/25 stock-bond portfolios. But the authors were careful to describe withdrawal rates as tools for planning, not contracts guaranteeing future results.

That distinction still matters.

Historical survival does not guarantee future survival.

Is the 4% rule still valid in 2026?

It is still useful as a planning benchmark, but 4% should not automatically become your personal withdrawal rate.

Modern research lands remarkably close to the original number for a conventional retirement.

Morningstar’s latest U.S. research estimates a 3.9% safe starting withdrawal rate for 2026 for retirees seeking steady inflation-adjusted spending over 30 years with a 90% probability of having money remaining at the end.

Vanguard’s current retirement-income research similarly says withdrawals of roughly 3.5% to 4% can support 30 years or more for many households, depending on portfolio and circumstances.

That does not prove that 3.9% is “the new 4% rule.”

Different studies use different market assumptions, portfolios, success definitions, and methodologies.

The useful conclusion is simpler:

Around 4% remains a reasonable place to begin testing a traditional 30-year retirement plan. It is not a promise that 4% will work for everyone.

How do you calculate your retirement number?

The famous shortcut is:

Annual spending × 25 = portfolio needed at a 4% withdrawal rate

That works because:

1 ÷ 0.04 = 25

So if your portfolio must provide $40,000 per year:

$40,000 × 25 = $1,000,000

But there is an important correction.

You should ideally multiply the amount your investment portfolio must fund, not blindly multiply your total household expenses.

Suppose your retirement spending is $70,000 per year, but Social Security and a pension eventually provide $30,000.

Your long-term portfolio gap may be closer to:

$70,000 – $30,000 = $40,000

The rough 4% target for that gap would be:

$40,000 × 25 = $1,000,000

Vanguard similarly recommends calculating portfolio withdrawal needs after considering reliable income such as Social Security, pensions, annuities, or continued employment.

Early retirees need another step

If you retire at 40 but Social Security does not begin for decades, you cannot simply subtract future Social Security from today’s expenses and call the problem solved.

Your portfolio must first finance the bridge years before that income starts.

For FIRE planning, it is safer to model the retirement in stages:

1. Early retirement before Social Security or pensions
2. Later retirement after guaranteed income begins
3. Potential higher healthcare or long-term-care spending later in life

That gives you a more realistic target than one 25x calculation.

What does your target look like at different withdrawal rates?

The lower the initial withdrawal rate, the larger the portfolio you need.

Annual portfolio-funded spending	4% / 25x	3.5% / 28.6x	3.3% / 30.3x
$40,000	$1,000,000	$1,143,000	$1,212,000
$60,000	$1,500,000	$1,714,000	$1,818,000
$80,000	$2,000,000	$2,286,000	$2,424,000
$100,000	$2,500,000	$2,857,000	$3,030,000

These are planning targets, not guarantees.

The 3.3% column is particularly useful as a stress test for a longer retirement, because Morningstar’s recent analysis produced roughly that starting rate for a 40-year horizon under its base-case methodology.

Is 4% too high for early retirement?

It can be.

The original rule is most closely associated with a retirement lasting about 30 years.

Someone leaving work at 45 could need a portfolio to support spending for 40, 45, or even 50 years.

That changes the math significantly.

Morningstar’s recent research illustrates the effect clearly:

• 30-year horizon: about 3.9% base-case starting rate
• 40-year horizon: about 3.3%

A longer retirement gives your portfolio more time to encounter recessions, bear markets, inflation shocks, and unexpected spending.

That does not mean every early retiree must use exactly 3.3%.

Someone with flexible spending, future Social Security, part-time income, a paid-off home, or a large margin of safety may be comfortable with a different rate.

But if you are planning a 40- or 50-year FIRE retirement, using 4% without stress-testing a lower starting rate is aggressive compared with the horizon the classic rule was designed around.

See our FIRE movement guide for the bigger early-retirement picture.

The biggest danger: sequence-of-returns risk

Average returns do not tell the whole story once you start withdrawing money.

Imagine two retirees who both average the same long-term investment return.

One experiences a strong bull market during the first five years of retirement.

The other gets a major bear market immediately.

The second retiree can end up in much worse shape because they are withdrawing money while the portfolio is down. That means selling more shares at depressed prices and leaving fewer assets available to participate in a recovery.

This is sequence-of-returns risk.

Bengen’s original research was partly motivated by exactly this problem: average market returns and average inflation could hide the damage caused by bad years arriving at the wrong time.

Vanguard’s current research also warns that higher withdrawal rates become particularly dangerous when markets underperform early in retirement.

That is why the first several years after you stop working deserve extra attention.

What else can make the 4% rule fail?

A retirement that lasts longer than expected

A 30-year rule is less reassuring if you retire at 45 and live to 95.

Longevity changes how much margin your portfolio needs.

High inflation

The classic strategy increases spending with inflation.

That protects your purchasing power, but periods of high inflation can force increasingly large withdrawals, especially if markets are weak at the same time.

Poor portfolio allocation

The original research did not assume that retirees kept everything in cash or bonds.

Bengen found that having too little equity could actually shorten portfolio longevity because the portfolio lacked enough long-term growth to keep up with withdrawals and inflation.

This does not mean retirees should hold 100% stocks. It means a retirement portfolio still needs an appropriate balance between growth and stability.

Taxes

A $40,000 withdrawal does not necessarily give you $40,000 to spend.

Money withdrawn from a traditional 401(k) or Traditional IRA can generally create taxable income, while qualified Roth distributions receive different federal tax treatment.

The original Trinity Study specifically did not adjust its results for taxes or transaction costs.

So if you need $60,000 of after-tax spending, your portfolio may need to distribute more than $60,000.

Investment costs

Fees reduce the return that stays in your portfolio.

The higher your ongoing costs, the less room you have for withdrawals.

This is one reason low-cost investments can matter even more once a portfolio needs to fund decades of spending.

Should you withdraw exactly 4% every year?

No.

This is probably the most common misunderstanding of the rule.

The classic strategy is:

Year 1: 4% of starting portfolio

Later years: previous dollar withdrawal adjusted for inflation

It is not:

Every year: 4% of current portfolio value

Those strategies behave very differently.

Taking 4% of your current balance automatically cuts spending after markets fall and raises spending after markets rise.

The classic inflation-adjusted rule instead tries to provide a stable real paycheck, which means it can keep pushing withdrawals higher even after the portfolio loses money.

That stability is convenient, but it also creates more sequence risk.

Flexible spending can make a retirement plan stronger

Real households usually do not spend exactly the same inflation-adjusted amount every year for 30 years.

If markets fall sharply, you may be able to:

• Delay a major vacation
• Keep a car for another year
• Reduce discretionary purchases
• Skip an inflation increase
• Temporarily reduce portfolio withdrawals

Modern retirement research finds that allowing withdrawals to respond to market conditions can support higher initial spending than a completely rigid inflation-adjusted strategy, although the trade-off is less predictable annual income.

You do not need a complicated formula to benefit from this idea.

The basic principle is:

Do not force the portfolio to fund the maximum lifestyle every year regardless of what is happening.

Should you keep a large cash buffer?

A separate reserve can help, but there is no universal rule that every retiree needs exactly one or two years of expenses sitting in cash.

Holding too much cash also has a cost because that money may earn less than long-term investments and lose purchasing power to inflation.

A better approach is to maintain enough liquidity and contingency savings for predictable near-term spending and unexpected costs without assuming one fixed cash number fits everybody.

Vanguard’s current retirement guidance recommends setting aside resources for unexpected expenses and excluding that contingency reserve when calculating sustainable portfolio spending.

How Social Security changes the 4% calculation

Your portfolio does not necessarily need to carry your entire retirement by itself.

Social Security, pensions, annuities, rental income, or part-time work can cover part of your spending.

Suppose you want $70,000 per year in retirement and eventually receive:

• $25,000 from Social Security
• $10,000 from a pension

Your portfolio eventually needs to provide roughly:

$70,000 – $35,000 = $35,000

At a 4% starting rate, $35,000 corresponds to a rough portfolio target of:

$875,000

But timing matters.

If those benefits begin five or ten years after retirement, you still need enough assets to fund the earlier gap.

See our guide to how Social Security fits into retirement planning.

A practical way to use the 4% rule

Instead of asking, “Is 4% safe?”, work through these questions:

1. How much do I actually expect to spend each year?
2. How much of that spending must come from investments?
3. How long could my retirement realistically last?
4. How much of my spending could I reduce after a bad market?
5. What taxes and investment costs will come out of my withdrawals?
6. What happens if I start retirement with a major bear market?
7. Does the plan still work if I test 3.5% or 3.3% instead of 4%?

If a plan only works at exactly 4% with perfect market assumptions and no unexpected costs, the problem is probably not the rule.

The plan simply has very little margin for error.

Frequently asked questions

What is the 4% rule in retirement?

The 4% rule says to withdraw 4% of your starting retirement portfolio in year one, then adjust that dollar amount for inflation in subsequent years. It was developed as a retirement-planning guideline rather than a guaranteed withdrawal rate.

How much do I need to retire using the 4% rule?

A rough calculation is 25 times the annual spending your portfolio must fund. If your investments need to provide $50,000 per year, the 4% shortcut produces a target of about $1.25 million.

Is the 4% rule still safe in 2026?

It remains a reasonable starting benchmark for a roughly 30-year retirement, but it is not guaranteed. Morningstar’s latest U.S. research estimates a comparable 3.9% starting rate for a 30-year horizon under its fixed real-spending assumptions.

Should early retirees use 3.5% instead of 4%?

There is no universal 3.5% rule. A lower rate is reasonable to test when retirement could last much longer than 30 years. Morningstar’s recent base-case estimate falls to roughly 3.3% for a 40-year horizon, while Bengen’s original historical analysis found rates around 3% to 3.5% survived at least 50 years in the periods he studied.

Does the 4% rule include Social Security?

No. The rule describes withdrawals from an investment portfolio. Social Security, pensions, and other reliable income can reduce how much the portfolio needs to provide, although the timing of when those benefits begin still matters.

Does the 4% rule account for taxes?

Not automatically. The original Trinity Study did not adjust its results for taxes or transaction costs. Your actual gross withdrawal may therefore need to exceed your desired spending if part of the withdrawal is taxable.

What is sequence-of-returns risk?

Sequence-of-returns risk is the danger that poor investment returns arrive early in retirement while you are withdrawing money. Early losses can permanently weaken a portfolio because withdrawals leave fewer assets available to recover when markets rebound.

Bottom line

The 4% rule is still one of the most useful shortcuts in retirement planning, but use it as a starting point rather than a promise.

For a traditional retirement, the basic framework is simple:

Portfolio-funded annual spending × 25

then withdraw roughly 4% in year one and adjust the dollar amount for inflation.

And the original historical research behind that framework remains surprisingly close to modern retirement modeling. Morningstar’s current U.S. baseline for 2026 is 3.9% for a 30-year retirement.

The bigger adjustment comes when your retirement gets longer.

If you are trying to leave work in your 40s, stress-test something closer to 3% to 3.5%, model the years before Social Security separately, include taxes and fees, and make sure your plan can survive a bad market immediately after you retire.

Most importantly, keep some flexibility.

A retirement plan that can temporarily reduce discretionary spending after poor markets is more resilient than one that requires the same inflation-adjusted withdrawal every year regardless of what happens.

For more planning help, read our FIRE movement guide, how much you need to retire by age, and our Roth conversion ladder guide if you expect to retire before age 59½.

This article is for general educational purposes and is not individualized investment, tax, or financial advice. Withdrawal-rate research relies on historical data, market assumptions, portfolio allocations, and specific retirement horizons. Future returns and inflation may differ materially from past results, so consider your spending needs, taxes, other income, risk tolerance, and retirement length before choosing a withdrawal strategy.