A 401(k) Went to the Second Wife, Not the Two Kids

Under the federal ERISA spousal rule, a 401(k) that named a man's two children as beneficiaries passed instead to his second wife, because a surviving spouse is the default beneficiary of a private employer plan unless she signs a notarized written waiver.

A man died with a 401(k) that plainly named his two children as the beneficiaries. His second wife received the money anyway. Nothing was forged, nothing was contested in bad faith, and the plan administrator followed the rules exactly as written. The rules simply were not the ones he thought applied.

The case, described by 24/7 Wall St, turns on a provision of federal retirement law that quietly reorders a saver's intentions the moment he remarries. It is one of the most consequential gaps between what people believe their paperwork does and what it actually does, and it is almost entirely invisible until someone dies.

Why a beneficiary form loses to a marriage certificate

Private-sector 401(k) plans are governed by the Employee Retirement Income Security Act, the federal statute known as ERISA. Under ERISA, a married participant's surviving spouse is the default beneficiary of the account. That default is not a tiebreaker or a courtesy. It is a legal entitlement that sits above the beneficiary designation form, and it applies regardless of who is listed on that form.

The only way to direct the money elsewhere is for the spouse to give it up in writing. The waiver has to be specific, it has to be signed by the spouse, and it generally has to be witnessed by a notary or a plan representative. A spouse who has never signed such a document has not waived anything.

This is where remarriage detonates an otherwise tidy plan. A man who divorces, updates his 401(k) to name his two children, and then remarries has done the paperwork he thinks is required. But the new marriage creates a new spouse with a fresh statutory claim. The old designation form does not adjust itself, and the new wife never signed away rights she did not have at the time the form was completed. When the plan administrator processes the claim, federal law tells it to pay the spouse.

The estate-planning step most people believe protects them

The move savers reach for is a will or a revocable living trust. They name the children in the estate documents, sometimes explicitly reference the retirement account, and consider the matter settled. It does not work.

Retirement plan assets pass by contract and by federal statute, not through probate. A will governs the estate; a 401(k) is not part of the estate when a valid beneficiary or statutory default exists. ERISA is a federal law, and it preempts state inheritance and probate rules that might otherwise give effect to what the deceased wrote down. A trust document instructing that the 401(k) go to the children carries no authority over the plan administrator, who is legally obligated to follow the plan terms and ERISA, not the decedent's estate plan.

The same logic frustrates prenuptial agreements in a way that surprises even careful couples. A person signing a prenuptial agreement is, at that moment, not yet a spouse. ERISA's waiver requirement contemplates a signature from a spouse. Courts have repeatedly treated prenuptial waivers of retirement-plan rights as insufficient for this reason. The fix is mechanical and unglamorous: after the wedding, the new spouse signs a fresh, plan-specific waiver.

What remarried savers can actually do

The practical steps are narrow, but they are reliable when followed in order.

Get the plan's own waiver form. Every plan has one. A generic document drafted by a lawyer may not satisfy the plan's requirements, and the administrator decides what it will accept.
Have the new spouse sign it after the marriage, not before. A post-marriage consent is the version that holds up. A prenuptial promise to sign later is not the same thing as having signed.
Get it notarized and confirm receipt. A waiver sitting in a desk drawer is worth nothing. Ask the recordkeeper to confirm in writing that the executed consent is on file and that the beneficiary designation reflects it.
Redo it with every job change. A waiver applies to a specific plan. Roll the balance into a new employer's 401(k) and the consent does not travel with the money.
Understand the IRA difference. Individual retirement accounts are not ERISA plans in the same way, and in most states the named beneficiary on an IRA controls. Community-property states are the exception. Moving a 401(k) into an IRA changes which rules apply, which cuts both ways depending on the outcome you want.

Blended families carry the concentrated risk

The people most exposed are second-marriage households where the bulk of the wealth sits in a workplace retirement plan. For many American families it is the single largest asset, larger than home equity. If the intent is to leave it to children from a first marriage, that intent survives only if the current spouse formally consents.

There are alternatives when a spouse reasonably declines to waive. A participant can leave the 401(k) to the spouse and fund a bequest to the children from assets that do pass by will or by non-ERISA beneficiary designation, such as taxable brokerage accounts, an IRA or life insurance. Life insurance in particular is the common workaround, because the death benefit can be sized to match what the children would otherwise have received without asking the surviving spouse to give up a legal entitlement.

It is also worth naming what happened in the case that prompts all of this. The second wife did nothing improper. She inherited a statutory right by marrying, and the plan paid her because it had no lawful choice. The failure was upstream, in a beneficiary form that was never revisited after the wedding and an estate plan built on the assumption that a will settles everything.

A routine worth running once a year

Beneficiary designations are the least glamorous paperwork in personal finance and among the most decisive. Marriage, divorce, a death in the family, a new job, a rollover: each of these events can silently invalidate an arrangement that looked correct the day it was signed.

Broad market strength has pushed many retirement balances higher, which only raises the stakes of getting the paperwork wrong. As of the last trade on Friday, 11 September 2026, the S&P 500 tracker closed at $764.29, up 0.85% on the day, with the Nasdaq 100 tracker at $714.88 and the Dow 30 tracker at $525.79. Rising balances do not fix defective designations; they enlarge the consequences of one.

The annual check takes minutes. Log into the plan, read the named beneficiaries, compare them with current intentions, and confirm whether a spousal consent is on file. If the answer to that last question is unclear, it is almost certainly not on file.

Key facts

Governing law: ERISA makes the surviving spouse the default 401(k) beneficiary
Only valid override: Written, notarized spousal waiver signed after the marriage
What fails: Wills, living trusts and prenuptial agreements
S&P 500 (SPY) last close: $764.29, +0.85%, as of 11 Sep 2026 20:00 GMT

Frequently asked questions

Why did the 401(k) go to the second wife instead of the children?

Under ERISA, the federal law governing private employer retirement plans, a married participant's surviving spouse is the automatic beneficiary unless she has signed a written waiver. The children were named on the form, but the man remarried afterward and his new wife never waived her statutory rights, so the plan administrator was legally required to pay her.

Does a will or living trust override a 401(k) beneficiary designation?

No. Retirement plan assets pass by plan contract and federal statute, not through probate. A 401(k) with a valid beneficiary or a statutory spousal default is not part of the probate estate. ERISA preempts state inheritance law, so instructions in a will or trust carry no authority over the plan administrator.

Can a prenuptial agreement waive 401(k) spousal rights?

Generally not. ERISA's consent requirement contemplates a signature from a spouse, and a person signing a prenuptial agreement is not yet married. Courts have repeatedly found prenuptial waivers of retirement-plan rights insufficient. The reliable fix is for the new spouse to sign a plan-specific waiver after the wedding.

What does a valid spousal waiver require?

It must be in writing, specific to the plan, signed by the spouse after the marriage, and witnessed by a notary public or an authorized plan representative. Most plans supply their own form, and a generic document may not be accepted. Participants should confirm in writing that the executed consent is on file.

Do IRAs work the same way as 401(k) plans?

No. Individual retirement accounts are not subject to the same ERISA spousal-consent rule, and in most states the named beneficiary on an IRA controls regardless of marital status. Community-property states are an exception. Rolling a 401(k) into an IRA therefore changes which set of rules governs who inherits.

What can someone do if a new spouse will not sign a waiver?

Leave the 401(k) to the spouse and provide for children from other assets. Taxable brokerage accounts, IRAs and life insurance pass outside ERISA's spousal rule. Life insurance is the common solution because the death benefit can be sized to match the intended inheritance without asking the spouse to surrender a legal entitlement.

Sources

His 401(k) Named His Two Kids as Beneficiaries. Federal Law Handed It to His Second Wife Anyway — 24/7 Wall St

Photo: Pavel Danilyuk · Pexels Licence — source