Is a 401(k) Inheritance Taxable? What Heirs Need to Know

Is a 401(k) Inheritance Taxable?

A 401(k) left to you as an inheritance is generally taxable income when you receive distributions, but the exact tax treatment depends on your relationship to the deceased, the type of distribution you choose, and whether the account was pre-tax or Roth. There is no separate inheritance tax on a 401(k); the money is treated as ordinary income to the beneficiary, and early withdrawals before age 59½ may also trigger a 10 percent penalty unless an exception applies.

How Spouse Beneficiaries Are Taxed

If the original account owner was your spouse, you generally have the most flexible options. You can treat the 401(k) as your own, roll it over into your existing retirement account, or take distributions based on your own life expectancy. In all cases, withdrawals are taxed as ordinary income, and you avoid the 10 percent early-withdrawal penalty regardless of age because of the spousal rollover rules. Required minimum distributions (RMDs) are based on your age, not the deceased spouse's.

How Non-Spouse Beneficiaries Are Taxed

If you are a child, sibling, friend, or other non-spouse beneficiary, you cannot treat the 401(k) as your own. Under the SECURE Act, most non-spouse beneficiaries must fully distribute the account within 10 years of the owner's death. Distributions are taxed as ordinary income, and there is no RMD schedule during the 10-year period, only the requirement to empty the account by the end of year 10. Taking large distributions in a single year can push you into a higher tax bracket.

Roth 401(k) vs. Traditional 401(k) Inheritance

The tax treatment differs depending on whether the account is a traditional or Roth 401(k). Traditional 401(k) withdrawals are always taxable as ordinary income. Roth 401(k) withdrawals are tax-free only if the account was held for at least five years from the date of the original owner's first contribution. If that five-year rule is not met, the earnings portion of a Roth 401(k) distribution to a beneficiary is taxable and may also be subject to the 10 percent penalty unless an exception applies. The five-year clock starts on January 1 of the year the owner died.

Strategies to Reduce the Tax Bite

• Stretch distributions across multiple years to avoid a large single-year income spike.
• Consider a rollover to an inherited IRA if you are eligible, which can provide more control over distribution timing.
• Use the 10-year window strategically by taking smaller withdrawals in lower-income years.
• Check whether state income tax applies to inherited retirement distributions, as rules vary.

Common Mistakes to Avoid

Beneficiaries often miss required notifications or deadlines set by the plan administrator, which can force a full and immediate distribution with a large tax hit. Failing to name contingent beneficiaries can also lead to unintended tax consequences if the primary beneficiary predeceases the account owner or disclaims the inheritance.