The 4% Rule in 2026: Does It Still Work?

In 1994, financial planner William Bengen sat in his office in Southern California and ran thousands of simulations on historical market data. He tested every possible 30-year retirement period dating back to 1926 — through the Great Depression, World War II, the stagflation of the 1970s, and the Black Monday crash of 1987. He was searching for a single number: the maximum amount a retiree could withdraw each year, adjusted for inflation, without running out of money.

He landed on 4%.

Withdraw 4% of your portfolio in year one, adjust that dollar amount upward for inflation each year, and your money should last at least 30 years. In the worst historical period Bengen tested — a retiree who started in 1966 and endured years of high inflation and poor stock returns — 4% still survived. Barely, but it survived.

Three decades later, the 4% rule remains the most widely cited guideline in retirement planning. Financial advisors invoke it. Online calculators default to it. Retirees cling to it like a life raft.

But should they?

What the 4% rule actually says

The rule is simpler than most people realize — and more specific than most people apply it.

You take 4% of your total portfolio value on the day you retire. If you retire with $1 million, your first-year withdrawal is $40,000. The next year, you don't recalculate 4% of your current balance. Instead, you take last year's amount and increase it by inflation. If inflation was 3%, your second-year withdrawal is $41,200. Year three: $42,436. And so on, regardless of what the market does.

This is important. The 4% rule is not "withdraw 4% of your current balance each year." That's a different strategy entirely (one we'll discuss later). The original rule is a fixed real dollar amount set at retirement and adjusted only for inflation.

Bengen's research assumed a portfolio of 50–75% stocks and 25–50% bonds. He later refined his recommendation to 4.5% for portfolios that included small-cap stocks. The Trinity Study — conducted by three professors at Trinity University in 1998 — confirmed Bengen's findings using a broader data set and slightly different methodology. At a 4% withdrawal rate with a 50/50 stock-bond portfolio, the success rate over 30 years was approximately 95%.

That 95% success rate became the gold standard. But a 95% success rate also means a 5% failure rate — and if you're in that unlucky 5%, you run out of money while still alive.

Why it worked historically

The 4% rule is a product of U.S. market history, which has been extraordinarily favorable to investors. American stocks have delivered real (inflation-adjusted) returns averaging about 7% per year over the past century. U.S. bonds have returned roughly 2–3% real. A 60/40 portfolio earned about 5% real, and 4% withdrawals from a 5% real return leaves a cushion for bad years.

The U.S. also benefited from being the world's dominant economy for most of the 20th century, from a favorable regulatory environment for business, and from the dollar's status as the global reserve currency. These tailwinds helped American markets recover from every crash within a reasonable timeframe.

Bengen's original research covered some genuinely terrible periods — the 1929 crash, the 1973–74 bear market, the early 1980s recession with double-digit interest rates. The 4% rule survived all of them. That track record gave it enormous credibility.

But past performance, as every disclaimer reminds us, does not guarantee future results.

The case against the 4% rule in 2026

Several structural changes make today's retirement landscape meaningfully different from the one Bengen studied.

Retirements are longer. The 4% rule was designed for 30-year retirements — a 65-year-old living to 95. But people are retiring earlier and living longer. An early retiree at 55 needs their money to last 40 or even 45 years. At those time horizons, 4% has historically failed far more often. Bengen himself has noted that longer retirements require lower initial withdrawal rates — closer to 3.5% or even 3.3%.

Bond yields have been historically low. For much of the 2010s, bonds yielded close to nothing. Even after rate increases in 2022–2024, real bond yields remain below their long-term historical averages. Since bonds are half the portfolio in Bengen's model, lower bond returns reduce the portfolio's overall return potential and compress the safety margin.

U.S. exceptionalism may not continue. The 4% rule is based entirely on U.S. market data. Research by Wade Pfau and others has shown that if you apply the same methodology to international markets — the UK, Japan, Germany — the safe withdrawal rate drops to 3% or lower. American investors betting on continued U.S. outperformance are making a concentrated bet, not following a universal law.

The rule ignores taxes and fees. Bengen's 4% is a gross number. If you're withdrawing from a Traditional 401(k) or IRA, federal and state income taxes could consume 15–25% of each withdrawal. Your actual spending power is more like 3% to 3.4%. Investment fees — even low-cost index funds charge 0.03–0.20% — further reduce the effective rate. These costs didn't change, but retirees often forget to account for them.

It assumes rigid spending. The 4% rule doesn't care whether the market dropped 40% last year. You withdraw the same inflation-adjusted amount regardless. In reality, most retirees can and should adjust their spending. But if you follow the rule mechanically and the market crashes in year two, you're pulling large amounts from a shrinking portfolio — the exact sequence of returns risk that kills retirement plans.

When 4% is too aggressive

There are clear situations where a 4% withdrawal rate is likely too high.

If you're retiring before 60, you may need your money to last 35–45 years. A 3.3% to 3.5% initial rate provides a much larger safety margin. On a $1 million portfolio, that's the difference between $40,000 and $33,000 per year — $7,000 less, but potentially decades more runway.

If your portfolio is concentrated — heavy in one stock, one sector, or one asset class — the diversification assumptions underlying the 4% rule don't apply. A portfolio of 80% tech stocks behaves nothing like Bengen's 60/40 model.

If you live in a high-tax state, you need to gross up withdrawals to get the same after-tax spending. A Californian withdrawing $40,000 from a Traditional IRA might keep only $30,000 after federal and state taxes. Their effective withdrawal rate is really 5.3% on a spending basis, not 4%.

If you have significant healthcare risks and no long-term care insurance, you need a larger cushion for potential catastrophic expenses. The 4% rule assumes smooth, predictable spending — and nothing about American healthcare is smooth or predictable.

When you can go higher

There are also situations where 4% is conservative — even unnecessarily so.

If you have a pension that covers your essential expenses, your portfolio only needs to fund discretionary spending. You can afford a higher withdrawal rate because running out of investment money doesn't mean running out of income. It means fewer vacations, not missed meals.

If Social Security covers a large portion of your needs, the same logic applies. A couple receiving $4,000 per month in Social Security who needs $6,000 per month is only pulling $2,000 from their portfolio. On a $500,000 portfolio, that's 4.8% — but the risk is mitigated by the guaranteed income floor underneath.

If you're flexible about spending — willing to cut back by 15–20% during bear markets and increase during bull runs — you can safely start at 4.5% or even 5% using dynamic withdrawal rules. The key word is "flexible." Rigid spenders need lower rates. Adaptable ones can afford more.

Modern alternatives to the fixed 4% rule

The retirement planning field has evolved significantly since 1994. Several alternatives offer more nuance and flexibility.

Variable Percentage Withdrawal (VPW). Instead of a fixed initial rate, you recalculate your withdrawal each year based on your current balance and remaining life expectancy. At 65, you might withdraw 4.3%. At 75, 5.2%. At 85, 6.8%. This method automatically adapts to market performance — you take less after bad years and more after good ones. It virtually eliminates the risk of running out of money, at the cost of variable income.

The guardrails approach. Set a target withdrawal rate (say, 5%) with upper and lower guardrails (6.5% and 3.5%). If your actual withdrawal rate drifts above the upper guardrail because your portfolio has dropped, you cut spending by 10%. If it drifts below the lower guardrail because your portfolio has surged, you give yourself a 10% raise. Research by Jonathan Guyton and William Klinger showed this approach supports higher initial rates with high success rates.

TIPS ladder. For the risk-averse, build a ladder of Treasury Inflation-Protected Securities that mature each year of retirement, guaranteeing inflation-adjusted income for a set period. A 30-year TIPS ladder with current yields around 2% real could safely support approximately 4.5–5% withdrawals with zero market risk. The downside: no upside either. Your money is fully committed to the ladder.

The income floor plus upside portfolio. Cover essential expenses with guaranteed income sources — Social Security, pensions, annuities — and invest the rest aggressively. Withdraw from the portfolio for discretionary spending at whatever rate makes sense, knowing that if the portfolio goes to zero, your essentials are still covered.

The concrete math

Let's look at what different withdrawal rates mean on common portfolio sizes.

These are pre-tax numbers. After federal and state taxes on Traditional account withdrawals, reduce by 15–25% for your actual spending power. Use the retirement income calculator to model your specific tax situation.

The honest answer

Does the 4% rule still work in 2026? The honest answer: it depends on who's asking.

For a 65-year-old couple with a $1 million diversified portfolio, Social Security covering half their expenses, flexibility to adjust spending, and a 30-year time horizon — yes, 4% is probably fine. It might even be conservative.

For a 55-year-old early retiree with the same portfolio but no Social Security for 12 years, no pension, and a 40-year horizon — 4% is too aggressive. Start at 3.3% and revisit annually.

For anyone, the fixed version of the 4% rule — withdraw the same inflation-adjusted amount regardless of market performance — is outdated. The world has moved toward dynamic strategies that adjust withdrawals to market conditions. You should too.

William Bengen gave retirees an invaluable gift: a simple, evidence-based starting point. But a starting point is all it ever was. Your retirement isn't average. Your spending isn't fixed. Your markets aren't historical. The 4% rule is a useful compass, not a GPS. Use it to orient yourself, then build a plan that accounts for your actual life.

Not sure what withdrawal rate is right for your situation? Talk to a retirement advisor who can model your specific portfolio, income sources, and spending needs to find the right number for you.