How Much Tax on a 401(k) Withdrawal in 2026, and Is the 20% Withheld Enough? Six Households, Every State

Published 2026-10-10. Tax year 2026 (the return filed in early 2027).

How much tax will I pay on a 401(k) withdrawal in 2026?

The 20% your plan withholds is a prepayment, not the tax, and it is wrong in both directions. On a $50,000 withdrawal the plan withholds $10,000. A single 45-year-old earning $60,000 owes $15,353 of federal tax on it, including the $5,000 10% additional tax, so $5,353 more is due at filing. A 56-year-old who left the job at 55 and takes it straight from that employer's 401(k) owes $3,823 and gets $6,177 back. Across the 24 cases here, 20% falls short in 9 and is too much in 15; federal tax takes from 0.0% to 32.1% of the withdrawal.

Your withdrawal, your tax: the 401(k) withdrawal calculator
Free: the federal and state tax on your withdrawal, the 10% and its exceptions, and what the plan withholds against what you will owe, from the same engines.

The six households

Each withdrawal is a single lump sum from a traditional 401(k), paid to the account owner, on top of the household's other 2026 income below. Each household takes the standard deduction.

• W1: Single, 45, $60,000 of wages.
• W2: Married filing jointly, both 45, $120,000 of wages ($60,000 each).
• W3: Single, 52, retired, no other income (no exception to the 10%).
• W4: Single, 56, left the employer in the year of turning 55, no other income, withdrawing from that employer's 401(k).
• W5: Single, 63, retired, a $36,000 pension, Social Security not yet claimed.
• W6: Married filing jointly, 67 and 65, $40,000 of Social Security.

The plan must withhold 20% of a distribution that could have been rolled over and was paid to you instead (IRC §3405(c); Form W-4R); you can ask for more, not less. The tax is settled on the return. Before 59½ a 10% additional tax applies unless an exception does (IRC §72(t)); leaving the employer in or after the year you turn 55 is one, for that employer's plan only (IRS list of exceptions).

The federal tax a 401(k) withdrawal adds

The working 45-year-olds pay income tax at the rates above their wages plus the 10% additional tax on every dollar. The 52-year-old with no other income pays less income tax, because the standard deduction and the lower brackets come first, but still owes the 10% on every dollar. The rule-of-55 retiree has the same (zero) other income and no 10%: at every size the difference between the two is exactly the additional tax, $5,000 on $50,000. For the couple on Social Security, the withdrawal also makes part of their benefits taxable (IRS Publication 915), while the senior deduction new for 2026 shelters part of it.

Is the 20% withheld enough?

20% falls short for W1 (Single, 45, working) at every size; W2 (Couple, 45 and 45, working) at every size; W3 (Single, 52, retired early) only at $100,000. It is more than the tax for W4 (Single, 56, rule of 55), W5 (Single, 63, with a pension), W6 (Couple, 67 and 65, Social Security) at every size: no 10% additional tax applies, and the first part of each withdrawal falls into the standard deduction and the lowest brackets, so the tax stays under 20% of it. A shortfall can also bring an underpayment penalty; the estimated tax calculator shows what avoids it.

How much to withdraw to net $25,000

The smallest whole-dollar withdrawal whose federal tax leaves at least $25,000. In a state with an income tax the amount is higher by that state's tax on it (below).

State tax on a $50,000 withdrawal, every state

The state income tax the same $50,000 withdrawal adds, including the extra tax a few states charge on an early withdrawal with no exception (the 401(k) withdrawal calculator lists them). Local income taxes are not included.

Related: 72(t) SEPP calculator · The tax on a 2026 RMD · Retirees' 2026 returns, every state · Penalty-free withdrawals before 59½

Download the data

Every case on this page, with its inputs: 401k-withdrawal-tax-2026.csv (the 24 federal cases) · 401k-withdrawal-tax-2026-states.csv (the 306 state returns) · 401k-withdrawal-tax-2026.json (both, plus the net-$25,000 withdrawals; CC0). due_at_filing: positive = more owed than withheld, negative = refunded.

Questions

How much tax do you pay on a 401(k) withdrawal in 2026?

It is ordinary income at your federal and state rates, plus 10% before 59½ unless an exception applies. On $50,000: $15,353 of federal tax for a single 45-year-old earning $60,000, $8,823 for a single 52-year-old with no other income, $3,823 for a 56-year-old using the rule of 55, and $3,179 for a couple aged 67 and 65 on $40,000 of Social Security.

Is the 20% withheld from a 401(k) withdrawal enough?

Not if you are still working before 59½. The 20% is a prepayment the plan must take; the tax is figured on the return. On a $50,000 withdrawal a single 45-year-old earning $60,000 owes $5,353 more at filing, while a 56-year-old using the rule of 55 gets $6,177 back. Across 24 cases, 20% fell short in 9: every withdrawal of the two working households, and the early retiree's $100,000.

How much do I need to withdraw from my 401(k) to get $25,000?

It depends on the tax the withdrawal adds. In a state with no income tax: $35,810 for a single 45-year-old earning $60,000, $25,988 for a 56-year-old using the rule of 55, and $25,000 for a couple aged 67 and 65 on $40,000 of Social Security, whose first $25,000 adds no federal tax.

Do states tax 401(k) withdrawals?

Most do. On a $50,000 withdrawal, 10 jurisdictions tax the single 45-year-old nothing; a few states add their own tax on an early withdrawal on top of their income tax.

Method and sources

Every figure was computed by QuantCalc's open tax engines (federal 2.3.1, state 1.14.2) through the same module the free 401(k) withdrawal calculator runs: the household's 2026 return without the withdrawal and with it, the difference being the tax the withdrawal adds (income tax and the 10% additional tax on Form 5329). The 20% withholding is the statutory rate, applied to the withdrawal. Every figure on this page and in the data files was then recomputed by the C engines behind the federal and state tax APIs, from independently written requests, and agrees to the cent; the net-$25,000 withdrawals were checked to net at least $25,000 and to fall short one dollar lower. Federal tax uses the IRS Tax Table below $100,000 of taxable income, as a return does. The rules this study leans on:

• 26 U.S. Code § 3405 (withholding on pensions, annuities and certain other deferred income)
• IRS Form W-4R: withholding certificate for nonperiodic payments and eligible rollover distributions
• 26 U.S. Code § 72
• Retirement topics - Exceptions to tax on early distributions
• Rev. Proc. 2025-32: 2026 inflation-adjusted items (incl. One Big Beautiful Bill amendments)
• Publication 915, Social Security and Equivalent Railroad Retirement Benefits
• 26 U.S. Code § 151
• Instructions for Form 1040 (2025)

What is not modelled

• The households are illustrations, not averages. Each takes the standard deduction and has no other income than shown.
• A traditional (pre-tax) 401(k) with no after-tax basis; a Roth 401(k) or after-tax money is taxed differently.
• No RMD: every household is below its RMD age, so the whole withdrawal could have been rolled over and the 20% applies to all of it.
• Withholding is federal only; state withholding rules differ by state and are not modelled, so the state tax is all due at filing.
• The underpayment penalty a shortfall can bring is not figured; it depends on the prior year's tax.
• On a joint return the withdrawal is the first-named spouse's; wages are split evenly between the working spouses for the state return.
• Local income taxes (county, city and school-district) are not included.

An estimate, not tax advice. These are computed examples for the 2026 tax year from QuantCalc's open tax engines (federal 2.3.1, state 1.14.2). Your own return depends on facts these examples do not include. Check any decision with your tax preparer before acting.

@misc{quantcalc2026howmuchtaxdoyoupayona401kwithdrawalin202,
  title  = {How Much Tax Do You Pay on a 401(k) Withdrawal in 2026? The Real Tax vs the 20% Withheld, Six Households and Every State},
  author = {{QuantCalc Research}},
  year   = {2026},
  url    = {https://quantcalc.app/research/401k-withdrawal-tax-2026/},
  note   = {Accessed <date>}
}