How 401(k) Distributions Are Taxed

Distributions from a 401(k) are taxed as ordinary income in the year you take them—there is no preferential tax rate. If you withdraw before age 59½, you face a 10% early-distribution penalty unless you meet a narrow exception. Rollovers and direct transfers to IRAs avoid the mandatory 20% withholding, but missteps can be costly.

Ordinary income treatment

Every dollar you withdraw from a 401(k) is taxed as ordinary income at your marginal tax bracket, regardless of how long you held the investment or what gains accrued. There is no long-term capital gains preferential rate (15% or 20%), no qualified dividend treatment, and no stepped-up basis on death. This is a key difference from investing in taxable brokerage accounts, where stocks and bonds may qualify for lower rates.

This applies to pretax contributions and all employer matching. After-tax contributions (money you put in post-tax, if your plan allows) and designated Roth 401(k) contributions follow different rules (see below).

Mandatory withholding on eligible rollover distributions

When you request a distribution from a 401(k) that is eligible to be rolled over, the plan must withhold 20% for federal income tax. This is mandatory—you cannot opt out. If you withdraw $100,000, the plan withholds $20,000 and sends you $80,000, even if you do not owe that much in tax.

The withholding is calculated on the gross amount. If you are in a 32% bracket, the 20% withhold may not cover your full tax liability (32% of $100,000 is $32,000). You will owe the balance at tax time. Conversely, if you are in a 12% bracket, the 20% withheld exceeds your liability; you get a refund.

Direct rollover vs. indirect rollover

The 20% withholding applies to indirect rollovers—you receive the check and have 60 days to deposit it into an IRA or new employer plan. If you fail to deposit all the money (including the withheld 20%) within 60 days, the amount not deposited is treated as a permanent distribution and taxed, plus the 10% early-withdrawal penalty may apply.

A direct rollover avoids this trap. The plan custodian transfers the funds directly to your new IRA or employer plan, with no check in your hands. The full amount rolls over, and the 20% withholding is not triggered. Direct rollovers are the cleaner path.

The 10% early-withdrawal penalty

If you withdraw from a 401(k) before age 59½, you owe a 10% penalty on the distribution. This is in addition to ordinary income tax. So a $50,000 withdrawal at age 45, if you are in the 32% bracket, costs you roughly $16,000 in tax (32% × $50,000) plus $5,000 in penalty (10% × $50,000), for a total of $21,000. You net $29,000 out of the $50,000 you withdrew.

The early-withdrawal penalty applies to the amount withdrawn, not your total balance. If you withdraw $50,000 at age 50, the penalty applies to that $50,000. You can also withdraw again at age 51 or later; each distribution is evaluated separately.

Exceptions to the 10% penalty

The IRS allows several exceptions. The penalty does not apply if you:

• Reach age 59½ (the most common exception)
• Separate from service with the employer and withdraw starting the year of separation or later (this is age-agnostic—you can withdraw at 45 if you leave the employer)
• Become disabled (IRS definition)
• Have medical expenses exceeding 7.5% of adjusted gross income
• Are a beneficiary of a deceased participant (inheriting an ex-spouse’s 401k)
• Withdraw due to an IRS levy
• Use a “Rule of 55” (separate from service, then use SEPP calculations)

These exceptions are narrow. “I need the money” is not an exception. Losing a job is not an exception unless you withdraw after separating.

Designated Roth 401(k) contributions

Some plans offer a Roth 401(k) option. Contributions are post-tax (you pay tax upfront), and qualified distributions (after age 59½ and 5 years of account seasoning) are tax-free. However, the withholding and penalty rules still apply to Roth 401(k) withdrawals taken before age 59½. The difference is that if you satisfy both conditions (59½ + 5 years), the distribution is not taxed. If you do not, the earnings portion is taxable, and the 10% penalty may apply.

After-tax contributions (non-Roth)

Some plans allow after-tax (non-Roth) contributions—money you put in post-tax beyond the annual limit. When you withdraw this, a portion is your basis (the after-tax money you put in) and a portion is earnings. The basis comes out tax-free; the earnings are taxable. Calculating basis requires detailed records and may involve a pro-rata calculation if the plan does not separately track basis.

Loan mechanics and deemed distributions

Taking a 401(k) loan is not a distribution and does not trigger withholding or penalties. However, if you leave the employer while the loan is outstanding and do not repay it within the required timeframe, the loan is deemed a distribution. You owe tax and may owe the 10% penalty.

Required minimum distributions (RMDs)

Starting at age 73 (as of 2023), you must take annual required minimum distributions from your 401(k). The distribution is calculated using life-expectancy tables and the account balance as of December 31st of the prior year. If you do not take the RMD, the penalty is harsh: 25% of the shortfall (reduced to 10% if corrected in time).

One exception: if you are still employed and do not own more than 5% of the employer’s business, many plans allow you to defer RMDs until you actually retire. This is called the “still-working exception.” Roth 401(k)s do not have RMDs while you are alive if you still work.

State taxation

Federal withholding is 20%, but state income taxes also apply in most states. Some states do not withhold on 401(k) distributions; others withhold at rates between 2% and 6% (or follow federal withholding). You may face a combined federal + state withholding of 25% or higher. Be prepared for a smaller net check than you might expect.

Rollovers to IRAs

Rolling a 401(k) to a traditional IRA is common when you leave an employer. The pro-rata rule applies: if you have nondeductible-basis IRAs, rolling pretax 401(k) dollars into a traditional IRA aggregates with those IRAs for future Roth conversions. If you plan to do a backdoor Roth conversion, roll your 401(k) to a Roth (not a traditional IRA) to avoid the pro-rata rule.

Hardship distributions and plan-specific rules

Some plans offer hardship withdrawals—early distributions for financial hardship (medical, education, mortgage, home purchase). These are still subject to the 10% penalty unless an exception applies. Hardship does not create an automatic exception; you must still meet the age or separation criteria.

Plan rules vary. Some plans charge an administrative fee on distributions. Some plans require a waiting period before you can take a distribution. Check your plan document and summary plan description for specifics.

Example: layered withdrawal at age 50

You leave your employer at age 50 with a 401(k) balance of $300,000. You want to withdraw $50,000 to buy a house. Under the separation-of-service rule, the withdrawal is penalty-free. Withholding is 20%, so you receive $40,000 and $10,000 is withheld. The $50,000 is ordinary income, taxed at your bracket (say, 24%), so you owe $12,000 in tax. The $10,000 withheld is credited; you owe the additional $2,000 at tax time. If you stay employed and are under 59½, the same withdrawal costs you the 10% penalty—$5,000 extra.

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