His 401(k) Named His Two Kids as Beneficiaries. Federal Law Handed It to His Second Wife Anyway

A story that circulates through estate-planning offices with predictable regularity involves a man who divorces, updates his 401(k) beneficiary form to name his two children, and moves on. Years later he remarries. When he dies, the plan administrator sends the account to his second wife rather than to the kids. The paperwork he signed is ignored. The reason is federal law, and it is one of the least understood rules in all of retirement planning.

Why the Form on File Does Not Control

ERISA, the federal statute that sets the ground rules for private retirement benefits, governs employer-sponsored 401(k) plans. Under ERISA, a married participant’s surviving spouse is the automatic beneficiary of the account unless that spouse has signed a written waiver consenting to a different beneficiary. The waiver has to meet the plan’s formalities, usually notarization or a plan representative’s signature. Without it, the designation form does not control. The spouse does.

Suze Orman has described the underlying principle plainly: “When you have a retirement account, all retirement accounts, and ask you to name a beneficiary, your spouse has different rights than anybody else when it comes to your retirement accounts. Your spouse has the legal authority to take over your retirement account as if it was theirs.” That authority is precisely what defeats a pre-marriage designation naming the children.

Timing Trap for Remarried Workers

The scenario in the headline turns on sequence. The father filled out the beneficiary form after his first divorce, when he was single and free to name anyone. The children were the logical choice. The moment he remarried, ERISA’s spousal protection attached to the account automatically. The old designation remained on file but became unenforceable against the new spouse’s statutory claim, because she never signed a waiver giving it up.

A prenuptial agreement generally does not fix this problem. Courts have repeatedly held that a person cannot waive ERISA spousal rights before becoming a spouse, because those rights do not exist until the marriage does. The spouse must sign the waiver after the wedding, on the plan’s own form. Anything less leaves the default rule in place, and the default rule sends the money to the current spouse.

A Real Case, a $3 Million Lesson

The stakes in these disputes can be enormous. In a case that wound through the federal courts, a retiree had named his four children as beneficiaries on his 401(k) beneficiary form. He later remarried, but never obtained a spousal waiver from his new wife. Quarterly account statements still listed the children as beneficiaries. When he died in 2021 with roughly $3 million in the plan, ERISA’s rule applied without exception: the entire balance went to the surviving spouse. The children received nothing. The plan’s own beneficiary form, correctly filled out and on file for years, was simply overridden by federal law the moment the marriage began.

How Many Households Are Exposed

Remarriage is not a fringe scenario. Pew Research reported in October 2025 that about 66% of divorced U.S. adults have gone on to remarry, and over 1.8 million Americans divorced in 2023 alone. Each of those transitions creates a household where a 401(k) beneficiary form from an earlier chapter may no longer reflect the participant’s wishes, and where federal law may override the form entirely.

The account balances at stake are meaningful. The personal saving rate stood at 4.1% in August 2026, according to the Bureau of Economic Analysis, but that figure fluctuates and for most families the 401(k) remains the single largest asset they hold. Routing it to the wrong beneficiary does not merely disappoint someone. It reshapes the entire estate.

What Actually Redirects the Money to the Kids

The fix has to satisfy the plan, not just the participant. The current spouse signs a spousal consent form provided by the 401(k) administrator, waiving her right to the account and acknowledging that the children are named instead. The signature typically must be notarized, and it must be obtained on the plan’s form rather than through any side agreement. Only then does the beneficiary designation naming the children do what it appears to do.

There is an alternative route. Once a participant separates from service, rolling the 401(k) into an IRA removes the account from ERISA’s spousal consent framework in most states. An IRA owner can name children without a spouse’s signature, though community-property states can complicate that outcome. Life insurance and revocable trusts are also common workarounds when a spouse will not sign a waiver, because they let the participant direct assets to children without touching the retirement account the spouse is legally entitled to.

What the Rule Means in Practice

The federal rule applies to every ERISA-covered account in the country. A beneficiary form filled out with the best intentions, kept current for decades, and never disputed by anyone can still be superseded on the day the participant dies if the current spouse never signed a waiver. For remarried workers who want a 401(k) to reach children from an earlier marriage, the signature that matters is the spouse’s on the consent form sitting next to the beneficiary form. Most estate messes trace back to a missed form or a stale beneficiary like this one, which is why we put a full cleanup checklist in a free estate guide.

Editor’s note: This article was updated to include the Martinez federal court case, in which a $3 million 401(k) balance was paid to a second wife rather than four named children under ERISA’s spousal default rule, and to refresh the personal saving rate figure to August 2026 (4.1%) from the Bureau of Economic Analysis. The Pew Research remarriage statistic (66%) was confirmed against Pew’s October 2025 report, which also established that over 1.8 million Americans divorced in 2023.

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