What happens to a 401(k) when you die is decided by one form, not by your will. The beneficiary designation on file with the plan controls, and the plan administrator must follow it.
Key Takeaways
- The 401(k) beneficiary form is a plan document, and under ERISA (enacted 1974) the administrator must pay whoever is named on it, even when a will, trust, or divorce decree says otherwise (U.S. Department of Labor, EBSA).
- In Kennedy v. Plan Administrator for DuPont, the U.S. Supreme Court ruled 9 to 0 in 2009 that the plan must follow the beneficiary form on file, so an out of date form controlled roughly $400,000 (U.S. Dept. of Justice, OSG).
- For most 401(k) plans, federal law makes the surviving spouse the automatic beneficiary unless the spouse gave written, notarized or plan-witnessed consent to name someone else (IRS).
- With no valid beneficiary on file, the plan document decides, and the balance often passes to the estate and through probate, where a non-designated-beneficiary payout can be as short as 5 years if death occurs before the required beginning date (IRS).
- Most non-spouse beneficiaries who inherit face the SECURE Act 10-year payout window, a rule detailed on the heir-focused inherited 401(k) rules page rather than repeated here (IRS).
- The plan administrator, not your executor, processes the death claim, so heirs must file a claim, provide a certified death certificate, and follow the plan’s written procedures.
401(k) at Death: The Numbers That Govern
Figures reflect federal law as of September 2026. The 5-year and 10-year rules describe payout timing for heirs; see the linked inherited 401(k) rules page for the full beneficiary tax treatment.
What physically happens to a 401(k) at the moment of death?
At death, the 401(k) does not pass through your will. It transfers by contract to the person named on the beneficiary designation form held by the plan administrator or recordkeeper.
The account is frozen to the owner and the administrator begins its death-claim process. Because a 401(k) is an employer plan governed by ERISA, the Department of Labor confirms the plan can only pay benefits under the terms of the written plan document to participants or beneficiaries. This is a different mechanism from how the account grew while you were alive, which the how a 401(k) works overview explains.
Does the beneficiary form really override your will?
Yes. The beneficiary designation controls, and it beats a conflicting will, trust, or divorce decree. This is settled federal law.
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In Kennedy v. Plan Administrator for DuPont Savings and Investment Plan, a man’s ex-wife remained his named beneficiary even though their divorce decree waived her interest. He never updated the form. The Supreme Court ruled unanimously that the administrator’s duty is to follow the plan documents, and the beneficiary form is a plan document. The lesson for owners is simple: the paperwork on file is the plan, so it must say what you intend.
Who inherits a 401(k) if you name no beneficiary?
If no valid beneficiary is on file, the plan document decides, and the default order is set by the plan, not by you. Most plans name the surviving spouse first, then the estate.
When the balance defaults to the estate, it enters probate and loses the clean contract transfer a named beneficiary would have received. The IRS notes the plan document establishes the distribution options, and some plans require specific beneficiaries such as a spouse or child. A payout to a non-designated beneficiary can be compressed into as little as 5 years, which is why checking your form matters more than any estate document. The IRA version of this problem is covered in an IRA left to an estate.
Why does a spouse have automatic rights to a 401(k)?
Federal law gives a married worker’s spouse a protected claim on the 401(k) balance at death. In most 401(k) plans the surviving spouse is the automatic beneficiary unless that spouse signed a waiver. Spousal rights in a 401(k) also come up in divorce, as covered in a spouse cashing out a 401(k) during divorce.
The IRS explains that to name anyone other than the spouse, the spouse must give written consent, witnessed by a notary or a plan representative. For plans that must provide survivor annuities, such as money purchase and target benefit plans, the protection is delivered through a Qualified Preretirement Survivor Annuity (QPSA), which the IRS describes as a benefit paid to the surviving spouse unless both spouses waive it in writing. An adult child listed alone, without that signed spousal waiver, may not stand up.
How is the spouse process different from a non-spouse process?
A surviving spouse has options no other beneficiary gets, and the claim path differs accordingly. A spouse can generally roll the 401(k) into their own IRA and treat it as their own, which resets the distribution clock.
A non-spouse beneficiary cannot do a spousal rollover and instead uses an inherited account with its own payout timeline. Because a spousal rollover reopens planning choices, some surviving spouses in a lower-bracket year later evaluate a spousal rollover then Roth conversion. The heir’s tax treatment for either path lives on the inherited 401(k) rules page and the taxation of inherited accounts page rather than being repeated here.
401(k) death outcomes: spouse vs non-spouse vs no beneficiary
| Situation | Who receives it | How it is claimed | Key owner action now |
|---|---|---|---|
| Spouse named (or automatic) | Surviving spouse by contract | File claim with plan; spouse may roll into own IRA | Confirm spouse is listed and contingents are current |
| Non-spouse named (child, other) | The named person, if spousal waiver exists where required | Inherited account opened; claim filed with administrator | Get signed, notarized spousal consent on file |
| Trust named as beneficiary | The trust, per its terms | Administrator reviews trust documentation | Confirm the trust is drafted to hold retirement assets |
| No valid beneficiary | Plan default, often the estate | Probate; compressed payout window may apply | Name a primary and a contingent beneficiary today |
Naming a trust adds a layer of rules, and the choice between a conduit and an accumulation trust changes how distributions flow, as the conduit vs accumulation trust explainer covers.
What does the plan administrator actually do?
The plan administrator, not your family or your executor, controls the death claim. Heirs cannot simply access the account; they must go through the plan’s written procedures.
- The beneficiary notifies the plan administrator or recordkeeper of the death.
- The plan requests a certified copy of the death certificate and a completed claim form.
- The administrator verifies the beneficiary on file and the plan’s payout options.
- For a trust or estate, additional documentation (trust certification, letters testamentary) is required.
- The plan sets up the inherited or spousal account and processes the distribution election.
Because the administrator can pay only per the written plan and the form on file, an outdated or blank designation creates delay and disputes. Keeping a current record helps your retirement planning checklist stay complete.
Per stirpes vs per capita: which should the owner choose?
Per stirpes and per capita decide what happens if a beneficiary dies before you do. The two designations can send money to entirely different people, so the choice belongs to the owner, made in advance.
Under per stirpes, a deceased beneficiary’s share flows down to that person’s descendants (for example, a predeceased child’s share goes to that child’s children). Under per capita, the surviving named beneficiaries split the whole amount, and the deceased branch receives nothing. Not every plan offers both, so owners should confirm the wording their recordkeeper accepts.
How should owners check and update beneficiaries?
Owners should verify the 401(k) beneficiary form directly with the plan, not assume it. Review it after every major life event and at least every few years.
Log in to the recordkeeper portal or contact the plan administrator to see the primary and contingent beneficiaries actually on file. Update after marriage, divorce, a birth, or a death, and obtain fresh spousal consent when naming a non-spouse. Owners who are also weighing lifetime tax strategy sometimes pair this review with estate-focused planning; for example, a Roth conversion can shift assets to a tax-free bucket, and the way Roth conversions reduce a taxable estate is a separate lifetime decision from the beneficiary form. Surviving spouses navigating this after a loss can review resources built for widows and surviving spouses.
Where do the heir’s tax rules come in?
The owner controls who inherits and how; the heir’s tax bill is a separate topic governed by federal payout rules. This article deliberately stops at the transfer mechanics.
Once an account is inherited, questions such as the 10-year rule, required distributions, and how ordinary income tax applies belong to the beneficiary, and they are covered in full on the inherited 401(k) rules page rather than here. A named beneficiary who leaves a job before death should also confirm the account has not been moved, a scenario the what happens to your 401(k) when you leave a job guide addresses. HSAs follow different beneficiary rules, explained in what happens to an HSA when you die.
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A fiduciary planner can review these designations alongside your broader retirement tax picture.
Frequently asked questions
Does my will control my 401(k) after I die?
No. The 401(k) passes by the beneficiary designation form on file with the plan, and under ERISA the administrator must follow that form even if your will names someone else. The Supreme Court confirmed this in Kennedy v. DuPont in 2009.
What happens if I never named a 401(k) beneficiary?
The plan document decides. Most plans pay the surviving spouse first and the estate if there is no spouse, which sends the account through probate. A payout to a non-designated beneficiary can be compressed into as few as 5 years when death occurs before the required beginning date, per the IRS.
Can I leave my 401(k) to someone other than my spouse?
Only with your spouse’s written consent. In most 401(k) plans the surviving spouse is the automatic beneficiary, and to name anyone else the spouse must sign a waiver witnessed by a notary or plan representative, according to the IRS.
Who handles the 401(k) after death, my executor or the plan?
The plan administrator processes the death claim, not your executor. The beneficiary must notify the administrator, provide a certified death certificate, and complete the plan’s claim forms before any distribution is made.
What is the difference between per stirpes and per capita?
Per stirpes sends a deceased beneficiary’s share down to that person’s descendants. Per capita splits the balance only among the surviving named beneficiaries, so the deceased branch receives nothing. Confirm which options your plan supports.
Do beneficiaries owe taxes on an inherited 401(k)?
Traditional 401(k) inheritances are generally taxable to the beneficiary as ordinary income when distributed, and most non-spouse heirs use the SECURE Act 10-year window. The full tax treatment is covered on the inherited 401(k) rules page rather than here.
Can a surviving spouse roll the 401(k) into their own IRA?
Yes. A surviving spouse can generally roll an inherited 401(k) into their own IRA and treat it as their own, an option not available to non-spouse beneficiaries. Some spouses later model whether a Roth conversion fits a lower-income year.
Should I name a trust as my 401(k) beneficiary?
Sometimes, but it requires care. A trust must be drafted to hold retirement assets, and the choice between a conduit and an accumulation trust changes how distributions are taxed and timed. A qualified professional can review whether it fits your goals.
Methodology: This article is built from primary sources: the U.S. Department of Labor (EBSA), the Internal Revenue Service, and the U.S. Department of Justice Office of the Solicitor General, plus the Supreme Court decision in Kennedy v. Plan Administrator for DuPont. Figures reflect federal law in effect as of September 2026. Because 401(k) death benefits are a Your Money or Your Life topic, only official government and court sources are used; anonymous forum anecdotes are excluded. Individual plan documents vary, so owners should confirm details with their own plan administrator.
This article is for educational purposes only and is not individualized investment, tax, or legal advice. Consult a qualified professional about your specific situation.
