A $1 Million 401(k) Is Really Worth About $760,000 After Taxes. Here’s the Math Retirees Miss.

The $1 million 401(k) has become the default milestone for a comfortable retirement, showing up on projection calculators, in headlines, and in the mental math of anyone tracking a balance. The problem with that milestone is that traditional 401(k) balances sit in pre-tax dollars. Every withdrawal gets taxed as ordinary income, which means the number on the statement meaningfully overstates what a retiree actually gets to spend.

A useful working figure: a $1 million pre-tax balance translates to roughly $760,000 of after-tax purchasing power across a full retirement drawdown. That estimate assumes a blended effective federal rate in the low-to-mid-20s throughout the drawdown, plus a modest state income tax layer. The precise number shifts with withdrawal pace, filing status, and the presence of other income sources.

How the Tax Math Actually Works

Every dollar pulled from a traditional 401(k) is taxed at ordinary income rates. The 2026 federal brackets, set by the IRS under the One Big Beautiful Bill (signed July 4, 2025), run from 10% on the first $12,400 of a single filer’s taxable income up to 37% above $640,600. Married couples filing jointly hit the top bracket above $768,700. The 2026 standard deduction is $16,100 for single filers and $32,200 for joint filers, giving retirees a meaningful first layer of tax-free income before rates begin to apply.

For a retiree drawing $40,000 a year from a $1 million balance under the 4% rule, with a Social Security check on top, most withdrawals land in the 12% and 22% brackets. Effective federal rates typically settle in the mid-teens. Adding state income tax in higher-rate states like California, New York, or Oregon pushes blended effective rates into the low-to-mid-20s over a full retirement. One additional benefit worth knowing: the One Big Beautiful Bill gives taxpayers age 65 and older an extra $6,000 deduction on top of the standard deduction for tax years 2025 through 2028, which can meaningfully reduce a retiree’s effective rate in those early drawdown years.

Across a 25-year drawdown, the combined federal and state tax bill on a $1 million traditional balance often totals $200,000 to $250,000. That gap is where the $760,000 net figure originates.

Inflation Takes Another Bite

Taxes account for roughly half of the erosion. The Consumer Price Index for All Urban Consumers reached 333.918 in July 2026, up 3.4% over the prior 12 months. The Social Security COLA for 2026 was set at 2.8%, tied to CPI-W, meaning retirees who depend heavily on Social Security have watched purchasing power gradually erode even as their nominal checks grew.

401(k) balances are quoted in nominal dollars. A $760,000 after-tax pool today buys less than the same figure would have bought five years ago, and the gap compounds with each passing year. Across a 25 to 30-year retirement, 2% to 3% annual inflation reduces real purchasing power by roughly a third to a half. That math makes the tax hit feel almost secondary compared to the slow grind of inflation over a long drawdown.

Why $1 Million Is Rare Anyway

The base number is hard to reach in the first place. The personal savings rate was 4.0% in Q1 2026, down sharply from 6.2% in Q1 2024, according to the Bureau of Economic Analysis. With Americans spending roughly 96 cents of every dollar they earn, building a seven-figure account requires either a high income, a very long career of consistent contributions, or both.

Vanguard’s “How America Saves 2026” report, covering year-end 2025 data across 4.6 million participant accounts, puts the median 401(k) balance at $44,115 and the average at $167,970. Both are record highs, but both sit far short of a million dollars. Fidelity’s Q4 2025 data tell a similar story, with a median balance of $34,400 and just 665,000 accounts carrying a balance of $1 million or more across its entire platform. The million-dollar account is a top-decile outcome, and even that outcome loses roughly a quarter of its face value once withdrawals begin.

What Retirees Can Do About the Gap

Several approaches address the gap between statement value and spendable value:

1. Roth conversions before RMDs begin. Converting portions of a traditional 401(k) or IRA to a Roth in the low-income years between retirement and age 73 fills the 12% and 22% brackets at known rates. The converted balance grows tax-free and avoids required minimum distributions.
2. Withdrawal sequencing across account types. Drawing from taxable brokerage accounts first, at long-term capital gains rates of 0%, 15%, or 20%, and leaving Roth accounts for last stretches tax-advantaged growth and controls the effective rate on 401(k) draws.
3. The standard deduction functions as a zero bracket. The first $16,100 of a single filer’s income and $32,200 for joint filers in 2026 is taxed at zero. Structuring withdrawals to fill that zero bracket every year, even if the money is reinvested in a taxable account, captures a rate advantage that otherwise expires unused.

The $1 million balance is a real figure, and the roughly $240,000 in taxes and inflation-driven erosion is baked into that amount. Planning around the net figure rather than the gross aligns expectations with what is actually available to fund retirement spending.

Editor’s note: This update corrects the Q1 2026 personal savings rate to 4.0% (from 3.9%) per the Bureau of Economic Analysis, refreshes the CPI figure to the July 2026 reading of 333.918 (up 3.4% year over year per the BLS), and adds Vanguard and Fidelity 2025 year-end data showing a median 401(k) balance of $44,115 and 665,000 accounts with seven-figure balances. It also notes the One Big Beautiful Bill’s $6,000 additional deduction for taxpayers age 65 and older (2025 through 2028) and the 2026 employee deferral limit of $24,500.

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