The 4% Rule on $1M: Is $40K/Year Still Safe in 2026?

Margaret is 65, single, and retiring in Phoenix, Arizona with exactly $1,000,000 split across a traditional IRA ($600,000), a taxable brokerage account ($300,000), and a Roth IRA ($100,000). She wants one number: how much can she pull this year without running out of money? The 4% rule answers $40,000. Bengen’s revised research answers $47,000. A cautious 35-year horizon answers $35,000. The gap between those three numbers — $12,000 a year — is the entire decision, and where Margaret lands depends on three levers she controls.

Where the 4% rule came from — and what it actually claims

In 1994, financial planner William Bengen ran every 30-year retirement window in US market history back to 1926. He asked a simple question: what is the highest first-year withdrawal rate that never depleted a balanced portfolio across any of those 30-year periods — including someone who retired into the 1929 crash, the 1937 collapse, or 1968 stagflation? His answer was 4%.

The mechanic is precise and often misquoted. You withdraw 4% of your starting balance in year one — $40,000 on $1 million. In every subsequent year you raise that dollar figure by inflation, not by 4% of the new balance. So if inflation runs 2.5%, year two is $41,000, not 4% of whatever the portfolio is now worth. The percentage applies once, at the start. After that, you are giving yourself a fixed, inflation-protected paycheck.

The rule assumes a 30-year retirement and a portfolio of roughly 50–75% stocks with the rest in bonds. Under those conditions, 4% survived 100% of historical sequences. That is the claim: not that 4% maximizes your income, but that it almost never fails.

Why Bengen himself now defends 4.7%

The 4% figure was deliberately pessimistic — it was the survival rate for the single worst retiree in a century. Most retirees who used 4% died with more money than they started with. Bengen’s later work, expanding the portfolio to include small-cap and mid-cap stocks and using cleaner data, found the true worst-case safe rate is closer to 4.7% — $47,000 on $1 million.

Think of it this way: 4% is the speed limit posted for an ice storm. 4.7% is the speed limit for normal conditions. Both are “safe” — they describe different assumptions. The reframe matters because a retiree who treats $40,000 as a hard ceiling may be needlessly under-spending the early, healthy retirement years when that money buys the most life.

Lever 1: Your stock/bond mix sets the ceiling

The 4% rule was never about a single portfolio. Bengen found that the safe rate held across a stock allocation of roughly 50% to 75%. Below 50% stocks, the portfolio doesn’t grow fast enough to outrun inflation over 30 years, and the safe rate actually drops — counterintuitively, a too-conservative portfolio is riskier for a long retirement, not safer. Above 75%, the extra volatility doesn’t reliably raise the safe rate, and it increases the damage a bad early sequence can do.

• 30% stocks / 70% bonds: safe rate dips toward 3.5%. Feels cautious; is actually fragile against inflation over three decades.
• 60% stocks / 40% bonds: the sweet spot. Supports the full 4–4.7% range with the most consistent historical success.
• 90% stocks / 10% bonds: higher expected return, but a crash in your first five years can crater the balance below recovery. Sequence risk dominates.

Higher current bond yields in 2026 help. The decade of near-zero rates that worried planners through the 2010s is over; bonds now contribute meaningful real return, which strengthens the case for the 4–4.7% band rather than retreating to 3.5%.

Lever 2: Retirement length — every extra decade costs ~0.5%

The 4% rule is calibrated to 30 years. If you retire at 65 and plan to 95, that fits. But a FIRE retiree leaving work at 52, or anyone planning for longevity into their late 90s, is buying a 35–45 year horizon — and the math shifts.

More years means more chances for a bad return sequence to compound, and more inflation-adjusted raises stacking on top of a portfolio that may have been wounded early. Research consistently shows the safe rate falls by roughly 0.4–0.5 percentage points per additional decade:

Margaret is 65 and single. Average life expectancy puts her around 85, but planning to that average means a roughly coin-flip chance of outliving the money. Planning to 95 — a 30-year horizon — is the prudent default, which lands her squarely on the 4–4.7% band: $40,000 to $47,000.

Lever 3: Taxes turn $40K gross into very different spendable cash

This is the lever almost every 4%-rule article skips, and it is the one that changes Margaret’s actual lifestyle. The rule produces a gross withdrawal. What lands in her checking account depends entirely on which account the dollars come from.

Margaret has three buckets, and each is taxed differently when she pulls $40,000:

1. Traditional IRA ($600,000): every withdrawn dollar is ordinary income on her Form 1040. A $40,000 withdrawal, against the 2026 single standard deduction of $15,750 (IRC §63), leaves about $24,250 taxable — landing in the 10% and 12% brackets (single 12% bracket runs $11,926–$48,475 in 2026). Federal tax is roughly $2,670, so spendable cash is about $37,300.
2. Taxable brokerage ($300,000): only the gain portion is taxed, and long-term gains enjoy the 0% bracket up to $48,350 of taxable income for a single filer in 2026 (IRC §1(h)). If Margaret’s total taxable income stays under that line, she can realize tens of thousands in long-term gains at a 0% federal rate. A $40,000 withdrawal here can deliver close to $40,000 spendable.
3. Roth IRA ($100,000): withdrawals after age 59½ with a 5-year-old account are completely tax-free (IRC §408A). $40,000 gross equals $40,000 spendable. No bracket math, no RMDs during her lifetime.

The implication is large. If Margaret blindly pulls $40,000 entirely from her traditional IRA, she nets about $37,500 and stacks ordinary income that can later push her into IRMAA Medicare surcharges (which begin above $103,000 MAGI single in 2026, per CMS). If she sequences strategically — harvesting taxable gains in the 0% LTCG bracket and blending in Roth — her effective tax rate on the same $40,000 can approach zero. Same withdrawal rate. Thousands of dollars of difference in real spending power.

What most people miss: the rule is a starting point, not a thermostat

The single most common misuse of the 4% rule is treating it as a live percentage you recompute every year. It is not. The 4% applies once, to your starting balance. After that you simply inflate the dollar figure. If you instead take 4% of the current balance every year, your income whipsaws with the market — soaring in good years and collapsing in bad ones — which is psychologically brutal and mathematically a different strategy entirely.

The second thing people miss: the 4% rule already bakes in the worst case. Because it was built on the single most unlucky retiree in a century, the overwhelming majority of historical 4% retirees ended their 30 years with more money than they started with — often two or three times more. The rule’s failure mode is not running out; it is dying rich while having lived too frugally. That is precisely why Bengen revised upward and why guardrails exist.

The third miss is ignoring Social Security entirely. Margaret’s portfolio is not her only income. If she delays Social Security to 70 and collects, say, $36,000 a year, her portfolio only needs to cover the gap between her spending and that guaranteed, inflation-indexed check — which can drop her effective portfolio withdrawal rate well below 4% and dramatically de-risk the whole plan.

The guardrails alternative for people who find the static rule too rigid

If a fixed inflation-adjusted paycheck feels too blunt, the Guyton-Klinger guardrails method is the leading flexible alternative. You start higher — around 5%, or $50,000 on $1M — and set two rails:

• Upper guardrail: if a market drop pushes your current withdrawal rate above about 6% of the now-smaller balance, you cut spending roughly 10% the following year.
• Lower guardrail: if a strong market pulls your current rate below about 4%, you give yourself a roughly 10% raise.

The trade is explicit: you accept that your income can be cut in a bad market in exchange for a higher average income across the full retirement. Backtests show guardrails typically support a starting rate near 5% with success rates comparable to a static 4% — because you actively pull back spending exactly when the portfolio is under stress, which is the only moment that matters for sequence risk. The catch is discipline: guardrails only work if you actually cut when the rail is breached.

Putting it together: Margaret’s real range

Margaret is 65, single, in Arizona (a state that taxes IRA withdrawals at a flat 2.5% rate but fully exempts Social Security benefits), with a 30-year planning horizon and a 60/40 portfolio. The levers point her to:

• Static 4% rule: $40,000 gross — the safe floor she can take without monitoring anything.
• Bengen 4.7%: $47,000 gross — defensible given her diversified 30-year setup, if she is willing to glance at the plan annually.
• Tax-optimized spendable: by drawing first from her taxable account in the 0% LTCG bracket and blending Roth, she can make $40,000 gross deliver close to $40,000 net — effectively a free raise versus an all-traditional draw.

Her honest range is $40,000 to $47,000 of gross income, and the single highest-leverage decision is not the headline percentage at all — it is which account she empties first. Sequence your withdrawals to fill the 0% long-term-gains bracket and the bottom ordinary brackets each year before touching anything taxed higher, and you convert the same withdrawal rate into meaningfully more spendable cash. The percentage gets the headlines; the asset location wins the retirement.