She Inherited Her Father’s $400,000 401(k). One Direct Rollover Turned It Into a Roth She’ll Never Owe Tax On Again, a Door That’s Locked Shut If He’d Left the Money in an IRA

If your father, mother, or any non-spouse relative names you as the beneficiary on a workplace 401(k), you have a one-time escape hatch the tax code refuses to give you if that money is in an IRA when they die. You can roll an inherited 401(k) straight into an inherited Roth IRA, pay income tax once, and never owe another dollar of tax on that account for the rest of your life. This inherited 401(k) to Roth conversion is legal, mandatory for the plan to honor, and almost never mentioned by the administrator handing you the distribution paperwork.

Picture the daughter who inherits her father’s $400,000 401(k). Instead of accepting the default nudge into a traditional inherited IRA, she instructs the plan to send the balance as a direct rollover into an inherited Roth IRA titled in her name as beneficiary.

She owes ordinary income tax on the $400,000 in the conversion year. After that, the account grows tax-free and every qualified withdrawal comes out tax-free. Had her father moved that same money to a traditional IRA a week before he died, this door would be welded shut. Non-spouse heirs cannot convert an inherited traditional IRA to a Roth. Only a surviving spouse can.

What the Tax Code Actually Says

The authority is Internal Revenue Code §402(c)(11), added by the Pension Protection Act of 2006, and IRS Notice 2008-30, which clarified that a non-spouse designated beneficiary may direct the trustee of a qualified plan to transfer the death benefit into an inherited Roth IRA.

The Worker, Retiree, and Employer Recovery Act of 2008 made those direct rollovers mandatory for plans, so the administrator cannot refuse. Nowhere in the Internal Revenue Code does a non-spouse get the same conversion right on an inherited traditional IRA. As Clark Howard put it, “the tax code hates them or hates the people who inherit the money and takes a lot of it in tax.”

Who Qualifies, Who Gets Shut Out

You qualify if you are a designated non-spouse beneficiary (child, grandchild, sibling, partner, or friend) named directly on the 401(k) beneficiary form. Trusts qualify only if they meet the see-through rules. You are shut out if the money is already in an IRA at death, if you inherit through the estate rather than as a named beneficiary, or if you take a check payable to yourself before requesting the transfer. Spouses don’t need this rule. They can roll an inherited retirement account into their own IRA and convert it to a Roth at will.

Five Steps to Move the Money Cleanly

1. Confirm you are listed on the plan’s beneficiary designation form. That document, not the will, controls where the money goes.
2. Open an inherited Roth IRA at a custodian that supports them. Title it exactly as required, for example: “[Father’s Name], deceased, IRA F/B/O [Your Name], beneficiary.”
3. Instruct the 401(k) administrator to execute a direct trustee-to-trustee rollover into the inherited Roth IRA. Never take possession of the funds.
4. Estimate the federal and state income tax on the full pretax balance and set aside cash from outside the account to pay it. Do not use plan withholding, because withheld amounts count as a taxable distribution to you.
5. Report the conversion on your return using the Form 1099-R the plan issues and the Form 5498 from the new Roth custodian.

Traps That Can Blow Up the Whole Strategy

The entire balance becomes ordinary income in one tax year, which can lift you into the top bracket and phase you out of credits, ACA subsidies, and IRMAA surcharges on Medicare. In 2026, IRMAA kicks in for single filers once income tops $109,000, meaning a $400,000 lump conversion would push almost anyone well into the highest Medicare surcharge tier. Planning the conversion in a year when other income is low softens that blow.

For deaths after 2019, the SECURE Act 10-year rule applies to inherited Roth accounts. You must empty the account by December 31 of the tenth year after the original owner’s death. The growth is tax-free, but the clock keeps ticking.

Here is an important nuance that trips up many heirs: because a Roth IRA owner is never required to take lifetime distributions, an inherited Roth is always treated as if the owner died before their Required Beginning Date. That means no annual RMDs are required during years one through nine of the 10-year window. The entire balance can sit untouched until year ten. By contrast, if the original owner of a traditional account had already started taking required minimum distributions when they died, the IRS final regulations issued in July 2024 (Treasury Decision 10001) confirm that beneficiaries must also take annual RMDs in each of years one through nine, not just a lump-sum depletion at the end. Rolling to an inherited Roth rather than an inherited traditional IRA eliminates that annual distribution obligation entirely.

Two other traps deserve attention. If the plan cuts you a check first, the door slams shut because non-spouse beneficiaries cannot use the 60-day indirect rollover option. The conversion is also irrevocable. The Tax Cuts and Jobs Act eliminated Roth recharacterization for conversions made on or after January 1, 2018, so if you convert $400,000 and the market drops 30% the next month, you still owe tax on the pre-drop balance.

Whether the money is in a 401(k) or an IRA when your parent dies decides whether you inherit a lifetime tax-free bucket or a decade-long tax bill. Ask about it now, while the account is still at the employer, and while you’re at it, pull every beneficiary form in the family and read it (we put the whole cleanup checklist, including titling and beneficiaries, in a free estate guide here).

Editor’s note: This update adds the 2026 IRMAA threshold of $109,000 for single filers, and incorporates the IRS final regulations issued in July 2024 (Treasury Decision 10001) confirming that annual RMDs are required in years one through nine when the original account owner died on or after their Required Beginning Date, while also clarifying that inherited Roth accounts converted under this strategy carry no annual RMD obligation during the 10-year window.

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