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. Traditional 401(k) balances are held in pre-tax dollars. Withdrawals are taxed as ordinary income, which means the number on the statement overstates what the retiree gets to spend.

A working figure: a $1 million pre-tax balance translates to roughly $760,000 of after-tax purchasing power over a full retirement drawdown. That assumes a blended effective federal rate in the low-to-mid-20s throughout the drawdown, plus a modest state income tax. The precise number varies with withdrawal pace, filing status, and 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, updated by the IRS under the One Big Beautiful Bill, 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.

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 sit in the 12% and 22% brackets. Effective federal rates typically land in the mid-teens. Adding state income tax in states like California, New York, or Oregon pushes blended effective rates into the low-to-mid-20s over time.

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 is where the $760,000 net figure comes from.

Inflation Takes Another Bite

Taxes account for roughly half of the erosion. The CPI for All Urban Consumers reached 333.952 in June 2026, up from 322.561 a year earlier. Core PCE, the Fed’s preferred inflation gauge, sits at 130.082, in the 90.9th percentile of its 12-month range. The Social Security COLA for 2026 was set at 2.8%, tied to CPI-W.

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. Across a 25 to 30-year retirement, 2% to 3% annual inflation reduces real purchasing power by roughly a third to a half.

Why $1 Million Is Rare Anyway

The base number is hard to hit in the first place. The personal savings rate was 3.9% in Q1 2026, down from 6.2% in Q1 2024. Per capita disposable personal income sits at $68,391, with Americans spending 92.4% of it. Average annual household expenditures were $78,535 in 2024.

Median 401(k) balances run a fraction of the $1 million benchmark. 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 other erosion is included in that amount. Planning around the net figure, rather than the gross, aligns expectations with the amount available to fund retirement spending.

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