Taxes on an Inherited 401(k): Deadlines, Penalties, and Strategies

Money you pull from an inherited 401(k) is generally taxed as ordinary income in the year you take it, added on top of your wages and other earnings. Whether the account was traditional or Roth, your relationship to the person who died, and how quickly you draw the balance down all change the size of the bill. The taxes on an inherited 401(k) are usually smallest when you spread withdrawals across as many tax years as the rules allow, keeping each year’s income out of a higher bracket.

Traditional vs. Roth: What Gets Taxed

With an inherited traditional 401(k), every dollar you withdraw counts as ordinary income on your federal return.¹ The original owner funded the account with pre-tax dollars, so neither the contributions nor the growth have ever been taxed. That entire bill passes to you. A $200,000 balance pulled in a single year stacks on top of your salary and everything else, and can easily push you into a higher bracket.

An inherited Roth 401(k) is different because the owner already paid income tax on the contributions. If the distribution qualifies, you get the whole amount, including earnings, tax-free.² A distribution qualifies when the deceased owner’s Roth account had been open at least five tax years and the distribution is paid to a beneficiary after death.

If that five-year clock hasn’t run, the distribution is non-qualified. You still get the contribution portion tax-free, but the earnings portion is taxed as ordinary income.³ The five-year period runs from the owner’s first Roth contribution to that plan, not from when you inherited. Most beneficiaries of long-held Roth 401(k)s take everything tax-free.

No 10% Early Withdrawal Penalty

A common misconception: beneficiaries under age 59½ do not owe the 10% early withdrawal penalty on an inherited 401(k). Federal law specifically exempts distributions made to a beneficiary after the account owner’s death.⁴ It applies regardless of your age, whether the payout is lump sum or installment, and whether you’re a spouse or non-spouse.

The exemption only holds while the funds stay in an inherited account or come directly from the deceased’s plan. If a surviving spouse rolls the balance into their own IRA and later withdraws before 59½, that withdrawal is subject to the standard 10% penalty because the money is now treated as their own retirement savings.

How Fast You Have to Withdraw

Timing drives the tax bill more than anything else, and the timing rules depend on who you are to the person who died.

Surviving Spouses

A surviving spouse has options no other beneficiary gets. The most powerful is rolling the inherited 401(k) into your own IRA or 401(k).¹ Once rolled, the IRS treats the funds as if they were always yours. You don’t need to take Required Minimum Distributions until age 73, and the balance keeps growing tax-deferred.⁵ Under SECURE 2.0, the RMD age rises to 75 for people who turn 73 after December 31, 2032.⁶ The tradeoff: if you’re under 59½, any withdrawal from the rolled-over funds triggers the 10% penalty.

A spouse can also leave the funds in an inherited 401(k) or transfer them into an inherited IRA. Under this approach, distributions are based on your own life expectancy or the deceased’s remaining life expectancy, whichever works in your favor, and if the deceased died before their required beginning date you can delay RMDs until the year the deceased would have turned 73.¹ This option keeps penalty-free access no matter how young you are, which usually matters more than tax deferral for spouses who need the money now.

Non-Spouse Beneficiaries: The 10-Year Rule

Children, siblings, friends, and most other non-spouse beneficiaries fall under the SECURE Act’s 10-year rule: the entire balance must be out of the account by December 31 of the tenth calendar year after the owner’s death.¹ This replaced the older “stretch” approach.

How you withdraw during those ten years depends on when the owner died:

If the owner died before their required beginning date, you can withdraw any amount at any pace, as long as the account is empty by the end of year ten. No annual minimums in years one through nine.
If the owner died on or after their required beginning date, you must take annual RMDs in years one through nine, calculated using IRS life expectancy tables, with whatever remains withdrawn by the end of year ten.¹

Non-spouse beneficiaries cannot roll inherited 401(k) funds into their own IRA. The only transfer option is a direct trustee-to-trustee transfer into an inherited IRA titled in the deceased’s name for your benefit. If the plan sends you a check instead, that distribution is taxable income for the year and cannot be rolled over.

Eligible Designated Beneficiaries

A narrow group of non-spouse beneficiaries escapes the 10-year rule. The IRS calls them eligible designated beneficiaries:¹

Minor children of the deceased. Not grandchildren, nieces, or nephews.
Disabled or chronically ill individuals as defined under the Internal Revenue Code.
Beneficiaries not more than 10 years younger than the deceased.

Eligible designated beneficiaries can stretch distributions over their own life expectancy, which sharply reduces the annual tax hit. Minor children lose this status at the age of majority, defined as 21 under Treasury regulations. From that point, the 10-year clock starts and the balance must be fully withdrawn within those ten years.

Check the Plan Document

The IRS sets the maximum time you can stretch distributions, but the employer’s plan document can be stricter.⁷ Some plans require non-spouse beneficiaries to take a lump sum. Others only allow scheduled installments. Contact the plan administrator and confirm what your specific plan permits before choosing a distribution approach; the IRS rules only matter to the extent the plan allows them.

Strategies to Reduce the Tax Bill

The single biggest lever most beneficiaries have is timing. For a traditional inherited 401(k) under the 10-year rule where the owner died before their required beginning date, nothing forces you to wait until year ten and take everything at once. Spreading withdrawals across multiple tax years keeps each year’s income lower and often keeps you out of higher brackets.

The practical approach: estimate your income for each of the ten years, and take larger distributions in years when your other income is expected to be lower. If you’re between jobs, taking a sabbatical, or retiring early, those are natural years to accelerate withdrawals. Years with a bonus or a big stock sale call for smaller distributions or none at all.

Surviving spouses who roll the funds into their own traditional IRA and won’t need the money for decades benefit from continued tax-deferred growth. The longer the funds compound without being taxed, the more valuable the deferral. For spouses inheriting a Roth 401(k), rolling into an inherited Roth IRA preserves tax-free growth while satisfying distribution requirements.

Reporting and Withholding

Every distribution from an inherited 401(k) generates a Form 1099-R from the plan administrator, showing the gross amount, the taxable amount, and any tax withheld.⁸ You report this on Form 1040 for the year you received the money. The taxable amount adds to your adjusted gross income, which can also affect Medicare premium surcharges and how much of your Social Security is taxed.

When a distribution is paid directly to you rather than transferred trustee-to-trustee, the plan is generally required to withhold 20% for federal income tax. This is a prepayment, not the final bill. If your actual rate is higher, you’ll owe more at filing; if lower, you’ll get a refund. Either way, you receive only 80% of the gross upfront, which surprises many beneficiaries who were counting on the full amount.

Penalty for Missing a Deadline

Missing an RMD or the 10-year deadline is expensive. The IRS imposes a 25% excise tax on the difference between what you should have withdrawn and what you actually took out.⁹ If a required distribution was $30,000 and you withdrew nothing, the penalty alone is $7,500, on top of the income tax you still owe once you do take it.

The penalty drops to 10% if you correct the shortfall during a correction window, which generally runs until the earlier of when the IRS sends a deficiency notice or the end of the second tax year after the penalty was imposed.⁹ Catching a missed RMD and withdrawing the correct amount quickly can save thousands.

State Income Taxes

Federal tax is only part of it. Most states with an income tax also tax inherited 401(k) distributions as ordinary income. Roughly a dozen states either have no income tax or specifically exempt retirement plan distributions. If you’ve moved, or you live in a different state than the deceased, your state of residence when you receive the distribution is what governs. Check your state’s treatment before locking in a distribution schedule; it can meaningfully change your total tax bill.

1
Internal Revenue Service. Retirement Topics – Beneficiary
2
Internal Revenue Service. Roth Account in Your Retirement Plan
3
Internal Revenue Service. Retirement Plans FAQs on Designated Roth Accounts
4
Office of the Law Revision Counsel. 26 USC 72 – Annuities; Certain Proceeds of Endowment and Life Insurance Contracts
5
Internal Revenue Service. Retirement Topics – Required Minimum Distributions (RMDs)
6
Congress.gov. Required Minimum Distribution (RMD) Rules for Original Owners
7
Internal Revenue Service. 401(k) Resource Guide – Plan Participants – General Distribution Rules
8
Internal Revenue Service. About Form 1099-R, Distributions From Pensions, Annuities, Retirement or Profit-Sharing Plans, IRAs, Insurance Contracts, etc.
9
Office of the Law Revision Counsel. 26 USC 4974 – Excise Tax on Certain Accumulations in Qualified Retirement Plans