How much is your 401(k) really worth after taxes? Strong market performance often leads to headlines celebrating the growing number of “401(k) millionaires.” While those numbers may look impressive, they can create a false sense of security. A 401(k) balance is not the same as spendable retirement income, and taxes are the primary reason why.
For retirees, the more important question is not how much appears on an account statement, but how much of that money will actually be available to spend after taxes. That difference can significantly affect retirement confidence and long‑term financial security.
A 401(k) balance does not represent spendable income because withdrawals from traditional accounts are taxed as ordinary income, which reduces what retirees can actually use.
Traditional 401(k)s and IRAs are funded with pre‑tax dollars, grow tax‑deferred, and are taxed when withdrawn. In retirement, several income sources often stack together, including:
When these income sources combine, taxable income can rise higher than many retirees expect.
According to the IRS 2025 federal income tax brackets, many retirees fall into marginal brackets between 22% and 32%, before accounting for any applicable state taxes.
For many households, it is reasonable to expect that approximately 25% to 30% of traditional retirement withdrawals may go toward taxes over time. As a result, spending one dollar from a 401(k) may require withdrawing considerably more than one dollar.
Yes. Where retirement savings are held directly affects how much income remains after taxes, especially once withdrawals begin.
Many employer plans now offer Roth 401(k) options, for which current rules include:
(IRS Publication 590‑B, revised 2025: https://www.irs.gov/publications/p590b)
For individuals with large pre‑tax balances, Roth conversions may reduce future tax pressure by lowering future RMD amounts and creating more tax‑flexible income later in retirement.
Retirement taxes tend to have a meaningful impact once IRA and 401(k) balances grow large enough to trigger additional tax consequences.
This often occurs when combined tax‑deferred balances exceed:
At higher balances, retirees may experience:
In addition, under current law, most non‑spouse beneficiaries must withdraw inherited retirement accounts within 10 years. These withdrawals often occur during peak earning years, which can significantly increase taxes (IRS SECURE Act guidance, 2025).
The 4% rule is a guideline, not an income plan. It does not account for taxes, changing spending needs, or how retirees replace a paycheck.
While the rule has been widely discussed for decades, it was never designed to create predictable, real‑world income. Retirement planning is not simply about portfolio longevity. It is about creating reliable, sustainable cash flow that adjusts over time.
The best time to take Social Security depends on longevity, marital status, and available assets. This makes it an optimization decision rather than a simple age‑based choice.
Key Social Security Facts from the Social Security Administration:
According to the CDC’s most recent provisional data (2025), many Americans continue to live well into their late 70s and 80s. This makes longevity planning an important factor in claiming decisions. For married couples, delaying the higher earner’s benefit can significantly increase survivor income later in life.
Retirees should evaluate a 401(k) based on outcomes rather than balances, including:
At Aul Financial Group, LLC, retirement planning focuses on aligning tax strategy, income planning, and timing decisions so savings support both lifestyle goals and long‑term confidence. The true value of a 401(k) is measured in sustainable income, not headline numbers.
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Steven Aul is an independent financial professional with decades of experience helping individuals navigate retirement and financial planning. A Ball State University graduate with a bachelor’s degree in accounting, he is the host of The Aul Financial Hour – Your Money Matters on KMOX 1120 AM/104.1 FM and has contributed to publications including CNN Money, Forbes, and Fortune, while also leading financial workshops throughout the St. Louis area.
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