Last updated: August 16, 2026
How Much Do You Need to Retire? The 4% Rule Explained
This article is educational and general in nature, not personalized financial advice. See our Editorial Process for how we source and verify information like this.
For decades, "the 4% rule" was the closest thing personal finance had to a settled answer for how much you need to retire. In 2026, even the rule's own creator doesn't fully agree with it anymore — and understanding exactly why reveals more about building a real retirement number than the original rule ever did on its own.
Where the 4% Rule Came From
Financial planner William Bengen introduced the rule in a 1994 journal article, after testing every rolling 30-year period in U.S. market history back to 1926. His finding: a retiree withdrawing 4% of their starting portfolio value, then adjusting that dollar amount for inflation each year after, would have avoided running out of money in the vast majority of historical scenarios — a follow-up analysis known as the Trinity Study confirmed a 95%+ success rate over 30 years using a 50/50 stock-and-bond portfolio.
How the Rule Actually Works
The mechanic matters, since it's commonly misunderstood: you withdraw 4% of your portfolio's value in year one, then increase that same dollar amount by inflation every subsequent year — you don't recalculate 4% of your current balance annually. On a $1,000,000 portfolio, that's $40,000 in year one; if inflation runs 3% that year, you'd withdraw $41,200 in year two, regardless of how the portfolio itself performed.
Your Retirement Number: Working Backward From Spending
| Annual Spending Need | Portfolio at 4% | Portfolio at 3.9% |
|---|---|---|
| $40,000 | $1,000,000 | ~$1,026,000 |
| $60,000 | $1,500,000 | ~$1,538,000 |
| $80,000 | $2,000,000 | ~$2,051,000 |
| $100,000 | $2,500,000 | ~$2,564,000 |
The classic shortcut — multiply your desired annual spending by 25 — is simply the inverse of the 4% rule (1 ÷ 0.04 = 25). This gives you a rough target portfolio size before factoring in Social Security, a pension, or other income sources that would reduce how much your portfolio itself needs to cover.
Why the "Right" Rate Is Genuinely Disputed in 2026
Figures reflect Bengen's 2025 revised research and Morningstar's 2026 State of Retirement Income report on the same $2,000,000 starting portfolio.
The gap is real money, not a rounding error: $36,000 a year separates the most conservative and most flexible approaches on the same portfolio. Neither number is wrong — they're answering different questions with different assumptions.
Why the Numbers Disagree
- Bengen's revised 4.7% comes from expanding his original analysis beyond large-cap U.S. stocks and bonds to include small-cap and international equities, which historically improved worst-case outcomes.
- Morningstar's 3.9% uses forward-looking capital market assumptions — projected future bond yields and equity valuations — rather than historical backtesting, targeting a 90% probability of success over 30 years with fixed, inflation-adjusted spending.
- Neither approach is "the" answer — one looks backward at what worked historically, the other looks forward at what current market conditions imply. Reasonable, well-informed analysts can land in different places using either lens.
Time Horizon Changes the Math Significantly
| Retirement Length | Commonly Cited Safe Rate |
|---|---|
| 20 years | ~5% |
| 30 years (standard retirement) | ~3.9%–4.7% |
| 40+ years (early/FIRE retirement) | ~3.2%–3.5% |
A longer retirement simply needs to survive more years of potential market downturns and inflation, which is why early retirees planning a 40- or 50-year horizon generally need to plan around a meaningfully lower withdrawal rate than someone retiring at a traditional age with a 30-year horizon.
Flexible Spending Can Support a Higher Rate
Fixed, inflation-adjusted spending (the original 4% rule's mechanic) is the most conservative approach, since it never adjusts regardless of how the portfolio performs. A "guardrails" strategy — pre-committing to trim spending after a bad market year and allowing increases after strong years — can responsibly support a meaningfully higher starting withdrawal rate, commonly cited in the 5% to 5.7% range. The tradeoff is real: this approach requires genuine flexibility in your spending, particularly in the years immediately following a market downturn, which not everyone's lifestyle or temperament accommodates comfortably.
How to Calculate Your Own Retirement Number
- Estimate your annual spending need in retirement, ideally based on a realistic budget rather than a rough guess.
- Subtract other income sources — Social Security, a pension, part-time work — from that spending need to find what your portfolio actually needs to cover. See our guide to when to claim Social Security, since claiming age significantly affects this number.
- Divide the remaining amount by your chosen withdrawal rate (0.039 for a conservative target, 0.04 for the classic rule, 0.047 for Bengen's revised figure) to estimate your target portfolio size.
- Adjust for your actual time horizon — a longer expected retirement should generally use a more conservative rate from the table above.
- Revisit the number periodically, not just once — market conditions, your spending needs, and the underlying research itself all shift over time.
What the 4% Rule Doesn't Account For
- Taxes. Withdrawals from a traditional 401(k) or IRA are taxable income, meaning your actual spendable amount is lower than the raw withdrawal figure — see our traditional vs. Roth IRA guide for how account type affects this.
- Healthcare costs, which often rise faster than general inflation and can be a significant, uneven expense in later retirement years.
- Major one-time expenses — a home repair, helping a family member, a large purchase — that a smooth, steady withdrawal rate doesn't naturally accommodate.
- Your specific portfolio composition, since the research above assumes particular stock-and-bond mixes that may not match your actual allocation.
Sequence of Returns Risk: Why Timing Matters More Than Average Returns
Two retirees can experience the exact same average annual return over a 30-year retirement and end up with dramatically different outcomes, purely based on when the bad years happen. A retiree who experiences a significant market downturn in the first few years of retirement is withdrawing a fixed dollar amount from a shrinking portfolio, which locks in losses in a way that doesn't happen if the same downturn occurs later, after years of growth have built a larger cushion. This is called sequence of returns risk, and it's a major reason the safe withdrawal rate research above is built around worst-case historical scenarios rather than simply averaging long-term returns. Practically, this is also why some retirees choose to hold one to two years of spending in cash or short-term bonds specifically — not for the return, but so a market downturn early in retirement doesn't force selling investments at a loss to cover living expenses.
A Worked Example: Combining Social Security With Your Portfolio
Consider someone who determines they'll need $70,000 a year in retirement spending. If they expect $28,000 a year from Social Security, their portfolio only needs to cover the remaining $42,000 — not the full $70,000. At a 3.9% withdrawal rate, that requires a portfolio of roughly $1,077,000, compared to nearly $1,795,000 if they ignored Social Security entirely and planned to cover the full $70,000 from savings alone. This is exactly why the "subtract other income first" step in calculating your retirement number matters so much — for most people, Social Security alone meaningfully reduces the portfolio size required, and a pension or continued part-time work reduces it further still.
Common Mistakes
- Treating 4% (or any single number) as a guarantee rather than a research-informed starting point that still requires periodic reassessment.
- Recalculating withdrawals as a percentage of the current balance each year instead of following the rule's actual mechanic — adjusting the original dollar amount for inflation.
- Ignoring other income sources when calculating a target portfolio, overestimating how much the portfolio itself needs to cover.
- Using a 30-year assumption for a much longer early retirement, understating how conservative the withdrawal rate should actually be.
- Picking a single expert's number without understanding why it differs from others, rather than understanding the underlying assumptions well enough to judge which fits your own situation.
The Bucket Strategy: A Practical Way to Manage Sequence Risk
Beyond simply holding some cash, many retirees structure their portfolio into distinct "buckets" based on when the money will actually be spent, as a practical way to manage sequence of returns risk without abandoning long-term growth entirely:
- Bucket one — near-term spending (1–2 years): Cash or cash-equivalents, covering living expenses regardless of what markets do in the short term.
- Bucket two — medium-term (3–10 years): A more conservative mix of bonds and dividend-paying investments, refilling bucket one periodically.
- Bucket three — long-term growth (10+ years): A stock-heavy allocation left to grow, since this money won't be touched for a decade or more, giving it time to recover from any downturn along the way.
The logic: a market downturn doesn't force you to sell stocks at a loss to cover this month's expenses, since near-term spending is already covered by bucket one. As bucket one depletes, it's refilled from bucket two during periods when markets are cooperating, rather than on a fixed schedule regardless of market conditions. This isn't the only reasonable approach to managing withdrawal risk, but it's one of the more widely used frameworks precisely because it gives retirees a concrete answer to "what do I actually sell, and when" rather than an abstract percentage alone.
Withdrawal Order Across Account Types
Most retirees don't hold their entire portfolio in one account type — a mix of a taxable brokerage account, a traditional 401(k) or IRA, and possibly a Roth account is common. The order you draw from each affects your tax bill in a given year, independent of the withdrawal rate itself. A commonly cited general approach: spend from taxable accounts first (since capital gains are often taxed more favorably than ordinary income), then tax-deferred accounts like a traditional 401(k) or IRA, and leave Roth accounts for last, since qualified Roth withdrawals are tax-free and benefit the most from continued tax-free growth the longer they're left untouched. This is a general starting framework, not a universal rule — required minimum distributions, specific tax bracket considerations in a given year, and Roth conversion strategies can all justify deviating from this order for a specific household's situation.
Frequently Asked Questions
Is the 4% rule still accurate in 2026?
It remains a reasonable starting point, but current research has moved in different directions: the rule's creator, William Bengen, now suggests up to 4.7% is safe with a more diversified portfolio, while Morningstar's forward-looking research suggests a more conservative 3.9%. Both are defensible; neither is a guarantee.
How much money do I need to retire?
A common shortcut is multiplying your desired annual spending by 25 (the inverse of the 4% rule), then subtracting the value covered by other income sources like Social Security. Your actual number depends on your specific spending needs, time horizon, and how conservative you want your withdrawal assumption to be.
Does the 4% rule mean withdrawing 4% every year?
No — the original mechanic withdraws 4% of your starting portfolio value in year one, then increases that same dollar amount by inflation each subsequent year, rather than recalculating 4% of your current balance annually.
Why do Bengen and Morningstar disagree on the safe withdrawal rate?
They're using different methods: Bengen's revised figure comes from historical backtesting with a more diversified portfolio, while Morningstar uses forward-looking capital market assumptions about future bond yields and equity valuations. Different methods, applied to genuinely different questions, produce different — but both reasonable — answers.
Should early retirees use a lower withdrawal rate?
Generally yes — a longer retirement horizon needs to survive more years of potential market downturns, so research commonly suggests a lower starting rate (often cited around 3.2% to 3.5%) for retirements expected to last 40 years or more, compared to roughly 3.9% to 4.7% for a standard 30-year retirement.
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Revisiting Your Number Over Time
A retirement number calculated once in your thirties and never revisited stops reflecting reality fairly quickly. Spending needs shift, market conditions change the underlying research itself (as the Bengen-versus-Morningstar gap shows clearly), and life events — paying off a mortgage, becoming an empty nester, a health change — all move the actual dollar figure you're targeting. Treating the calculation as a periodic check-in, ideally revisited every few years and again seriously as retirement approaches, keeps the number meaningfully connected to your actual life rather than a static figure calculated once and forgotten.
Where to Go Next
Related guides on ClearCents:
Use the Rule as a Compass, Not a Guarantee
The 4% rule — or 3.9%, or 4.7%, depending on whose research you trust — remains genuinely useful precisely because it converts an abstract goal into a concrete number you can plan around. Just hold that number loosely: revisit it periodically, understand what it doesn't account for, and adjust as your actual situation and the underlying research both evolve.
Want to see how your 401(k) or IRA contributions build toward that number? Our 401(k) guide covers the accounts most people use to get there.