Inherit a $200,000 401(k) From a Parent and Have the Plan Cut You a Check, and the Whole $200,000 Is Taxable Income That Year. A Non-Spouse Heir Gets No 60 Days to Fix It, and No Rollover Into Their Own IRA, Ever

When a parent passes and leaves a 401(k) to an adult child, the plan’s distribution paperwork usually offers two options: a check or a transfer. For a non-spouse heir, that choice is permanent. A check made out to the heir counts as a taxable distribution. The full pre-tax balance lands on that year’s return, and the tax code offers no way to undo it. On a hypothetical $200,000 account, choosing the check can cost thousands of dollars in extra federal tax. It also gives up a decade of tax-deferred growth.

Why a Spouse Can Repair the Mistake and a Child Cannot

The tax code treats surviving spouses very differently from every other heir. IRS Publication 590-A says a spouse who receives a distribution from a deceased spouse’s account “can roll that distribution over into your own IRA within the 60-day time limit.” Children, siblings, and other heirs don’t have that window.

For anyone other than a spouse, the same publication says the heir “can’t treat the inherited IRA as your own” and “can’t roll over any amounts into or out of the inherited IRA.” The statute says the same thing. 26 U.S.C. § 408(d)(3)(C) denies rollover treatment for inherited accounts held by anyone who was not the surviving spouse. Once the check is cashed, the money cannot go back into a tax-advantaged account. It can never be combined into the heir’s own IRA.

How the Only Tax-Free Route Works

Congress created one exit for non-spouse heirs. Under 26 U.S.C. § 402(c)(11), a direct trustee-to-trustee transfer from a deceased worker’s 401(k) into an IRA set up to receive it is treated as an eligible rollover distribution, and the receiving account becomes an inherited IRA. No tax is due on the move. The money must go straight from the plan to the IRA custodian without ever passing through the heir’s hands.

Taking the check also triggers withholding. Under 26 U.S.C. § 3405(c), the payer of an eligible rollover distribution must withhold 20% unless the recipient elects a direct transfer. On a $200,000 account, that sends $40,000 to the IRS up front, and that amount may still fall short of the final bill.

What a Lump Sum Does to One Year’s Tax Return

Take a hypothetical single filer with $60,000 of taxable income under the 2025 federal brackets. Adding the full inheritance pushes this filer’s taxable income into the 35% bracket, so the heir pays a large share of the parent’s savings at rates they would never normally pay.

For single taxpayers, the 32% rate starts at $197,301, and the 35% rate starts at $250,526. Working through each bracket, the lump sum adds about $52,433 in federal income tax. The mandatory withholding covers $40,000 of that. Roughly $12,433 would still be due at filing time, before any state income tax.

One rule does help heirs. Under 26 U.S.C. § 72(t)(2)(A)(ii), distributions paid to a beneficiary after the account owner’s death are exempt from the early-withdrawal penalty. A younger heir owes ordinary income tax but no added penalty.

Spreading the Income Across a Decade

An inherited IRA still comes with a deadline. IRS Publication 590-B says a designated beneficiary who is not an eligible designated beneficiary must “fully distribute the IRA by the 10th anniversary of the owner’s death.” If the owner died in 2025, a non-eligible designated beneficiary generally must empty the account by December 31, 2025. If the parent had already started required distributions, annual minimums may also apply during the years before the deadline.

That 10-year window is where the savings come from. If the heir splits the inheritance into ten equal withdrawals, the same filer’s taxable income rises to $80,000 each year. That stays inside the 22% bracket, which tops out at $103,350.

At 22%, the ten withdrawals produce about $44,000 in total federal tax. That is roughly $8,433 less than the lump sum, assuming the heir’s income and the brackets hold steady. Meanwhile, the money still in the account keeps growing tax-deferred.

A short list of heirs is exempt from the 10-year rule. Under 26 U.S.C. § 401(a)(9)(E)(ii), eligible designated beneficiaries include a widow or widower, a minor child, a disabled or chronically ill person, or someone not more than 10 years younger than the deceased. Most adult children are more than a decade younger than their parents, so they fall under the 10-year clock.

The inherited account rules are one of nine IRS tripwires that quietly drain six figures from retirement savings. We mapped out the rest in a free guide here: The Retiree’s Tax Trap Map.

Steps to Take Before Signing the Distribution Form

1. Ask the plan administrator for a direct trustee-to-trustee transfer to an inherited IRA titled in the parent’s name for the benefit of the heir. Confirm that the receiving custodian has opened the account before the plan sends the money.
2. If a check payable to the heir has already been issued, it cannot be redeposited. Set aside cash beyond the 20% withholding and consider making estimated tax payments to cover the gap.
3. Map out withdrawals across the 10-year window. Take larger amounts in lower-income years, such as between jobs or in the first years of retirement, so more of the money is taxed at lower rates.

None of these rules has a grace period. A widow or widower has 60 days and can treat the account as their own. A child gets one chance to make a direct transfer. The box checked on the plan’s distribution form determines whether a parent’s 401(k) is taxed over a decade or all in a single filing season.

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