Free Guide to 401(k) Withdrawal Tax Information

How 401(k) Withdrawals Get Taxed: The Basics

When you withdraw money from a traditional 401(k), the IRS treats that money as income for the year you take it out. This means your withdrawal gets added to your other income—wages from your job, interest from savings accounts, rental income—and taxed according to your tax bracket for that year. If you earn $50,000 from your job and withdraw $15,000 from your 401(k), the IRS sees you as having $65,000 in taxable income that year.

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The amount of tax you owe depends on your tax bracket. In 2024, a single person filing individually falls into different brackets: 10% on the first $11,600 of income, 12% on income between $11,601 and $47,150, 22% on income from $47,151 to $100,525, and so on, up to 37% for the highest earners. So if your total income pushes you into a higher bracket because of your withdrawal, you might pay more tax on that withdrawal than you would have if you took it in a year when your other income was lower.

A key distinction: money you contributed to your traditional 401(k) came from your paycheck before taxes were taken out. The employer match also came in pre-tax dollars. This is why withdrawals are taxed—you haven't paid income tax on this money yet. The tax is deferred until you actually take the money out, which is where the "deferred" part of a traditional 401(k) comes from.

Roth 401(k)s work differently. You contributed money that was already taxed (after-tax dollars), so your withdrawals in retirement are generally tax-free. However, employer matches in a Roth 401(k) go into a separate account and still get taxed when withdrawn. Understanding which type of 401(k) you have matters enormously for tax planning.

Practical takeaway: Look at your 401(k) statements or ask your plan administrator whether you have a traditional or Roth 401(k). This one fact determines whether your withdrawals will be taxed as regular income.

Early Withdrawal Penalties and the 59½ Rule

The IRS wants you to leave your 401(k) alone until you're older, so it punishes early withdrawals. If you withdraw money from a traditional 401(k) before age 59½, you typically owe a 10% penalty on top of the regular income tax. So that $15,000 withdrawal we mentioned earlier could cost you $1,500 in penalties alone, plus whatever income tax applies based on your bracket. That's not a small thing—it means roughly one-seventh of your withdrawal disappears to penalties before you even see the money.

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This penalty applies to the amount you withdraw, not your total balance. If your 401(k) has $200,000 and you withdraw $15,000 at age 50, the penalty is 10% of $15,000, not your entire account. The penalty only applies to the withdrawal itself.

There are exceptions to the 59½ rule, though they're narrow. The IRS allows penalty-free withdrawals in these situations: substantially equal periodic payments (SEPP), which requires you to take fixed amounts annually based on life expectancy calculations; withdrawals due to disability; withdrawals after separation from service if you're at least 55; and withdrawals up to $35,000 in certain emergency situations (this rule started in 2024 under the SECURE 2.0 Act). Some people also withdraw funds after a job loss and use a provision called Rule 72(t) to avoid penalties.

Medical expenses present another potential exception, but it's specific: you can only withdraw penalty-free for unreimbursed medical expenses that exceed 7.5% of your adjusted gross income. If your income is $60,000 and you have $5,000 in unreimbursed medical bills, you'd only qualify because $5,000 exceeds 7.5% of $60,000 ($4,500). The regular income tax still applies—you just skip the penalty.

Practical takeaway: If you're thinking about tapping your 401(k) before 59½, research the specific exception that applies to your situation. The penalty can be substantial enough to make other borrowing options worth exploring first.

Required Minimum Distributions and When They Start

At age 73 (as of 2023, thanks to the SECURE 2.0 Act), the IRS requires you to start taking money out of your traditional 401(k)—whether you want to or not. These are called Required Minimum Distributions, or RMDs. The IRS calculates how much you must withdraw based on your age and your 401(k) balance. The older you get, the larger the percentage you must withdraw each year. At age 73, you might withdraw around 3.65% of your balance. At age 85, that jumps to about 6.76%. At age 95, it's about 10.36%.

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The IRS publishes tables showing the exact divisor for your age. For example, at age 73, the divisor is 27.4. You take your December 31 balance from the previous year, divide it by 27.4, and that's your RMD for the year. If your 401(k) had $500,000 on December 31, your RMD at age 73 would be $500,000 ÷ 27.4, which equals roughly $18,250.

Miss an RMD and the penalty is steep: 25% of the amount you should have withdrawn but didn't (reduced to 10% if you correct the mistake within two years). So if you were supposed to withdraw $18,250 and didn't, you'd owe a $4,562 penalty, and that's in addition to the taxes owed on the missed amount. The IRS has been aggressive about enforcing RMDs.

Roth 401(k)s do have RMDs while you're alive, though not Roth IRAs. This is an important distinction that trips up many people. If you have a Roth 401(k), you must start taking RMDs at 73, even though the withdrawals themselves are tax-free. Some people roll Roth 401(k)s into Roth IRAs specifically to avoid RMDs.

Practical takeaway: Calculate what your RMD will be around age 70 so you're not surprised. If the amount is larger than you need to spend, look into whether a Roth conversion or charitable giving strategy might reduce your tax burden.

The Tax Consequences of Lump-Sum Withdrawals

Some people leave a job or retire and decide to withdraw their entire 401(k) balance at once rather than leaving it invested or rolling it into an IRA. This creates a massive, sudden spike in taxable income. If your normal income is $60,000 and your 401(k) has $300,000, you're reporting $360,000 in taxable income for that single year. This can push you into a much higher tax bracket, resulting in a much higher effective tax rate on your entire income for the year.

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Let's work through a real example. Sarah is 62 and retired. Her Social Security is $25,000 annually. She also has $250,000 in a traditional 401(k). In a normal year, she'd be taxed on $25,000 at favorable rates (probably around 12%). But if she withdrew the entire $250,000 in one year, she'd have $275,000 in taxable income. That extra $250,000 would push her well into the 22% and 24% brackets, potentially costing her $50,000 to $60,000 in federal income tax alone, plus state taxes if applicable.

Some lump-sum withdrawals receive special tax treatment called "forward averaging" if the withdrawal qualifies, but the rules are narrow and this option is rarely available to most people anymore. More commonly, people end up paying significantly more tax than they would have if they'd spread the withdrawal over several years.

The tax impact becomes even more complicated if you're also receiving Social Security. A large 401(k) withdrawal can