He Remarried at 65 With $1.8 Million Saved for His Kids and It’s Still Going to His Kids. One Signature After the Wedding, Not the Prenup, Is What Sealed It

If you have a 401(k), a pension, or most other employer retirement plans, federal law hands your spouse the account the second you say “I do,” no matter what your will, your prenup, or your beneficiary form says. That is the rule almost nobody talks about, and it is exactly why a 65-year-old remarrying with $1.8 million saved for his kids from a prior marriage needs one specific signature, from his new spouse, after the wedding, to keep that money on track to the children.

The Buried Rule Inside Your 401(k)

Here is the piece the fine print does not advertise: under federal law, your new spouse automatically becomes the beneficiary of your 401(k), 403(b), pension, or other ERISA-governed plan on the day you marry. Your old beneficiary form naming your kids is overridden by operation of law. The only way to keep the kids as beneficiaries is a written spousal consent (also called a spousal waiver), signed by your new spouse, witnessed by a plan representative or notarized, and filed with the plan.

That single form is what actually seals the outcome. The plan document overrides prenups, wills, and trusts alike. The plan administrator answers to federal law, and federal law wants a signature from the spouse whose rights are being waived.

The Statute That Makes It Stick

The rule lives in the Employee Retirement Income Security Act, specifically the Retirement Equity Act amendments codified at 29 U.S.C. §1055 and mirrored in the tax code at 26 U.S.C. §417. The Supreme Court reinforced it twice: Boggs v. Boggs (1997) and Kennedy v. Plan Administrator for DuPont Savings (2009). Both cases said the same thing: the plan document and the beneficiary designation control, and a spouse’s ERISA rights can only be waived by the spouse, in writing, after marriage.

Who This Actually Covers

The spousal-consent rule applies to ERISA-covered plans: 401(k)s, 403(b)s, most pensions, profit-sharing plans, and employer-sponsored plans that provide a qualified joint and survivor annuity. It does not apply to IRAs. IRAs follow state law, and in most states you can name anyone you want as beneficiary without your spouse’s signature (community-property states like California, Texas, and Arizona are the exception, so check locally). That distinction matters, because a lot of remarrying retirees roll their 401(k) into an IRA and never realize they just changed the rulebook.

How to Actually Lock It In

1. Before you remarry, list every retirement account you own and note whether it is ERISA-covered or an IRA.
2. After the wedding, request the plan’s spousal consent or waiver form from each 401(k) or pension administrator. Do not use a generic form off the internet.
3. Have your new spouse sign the waiver in front of a notary or a plan representative. The signature must be dated after the marriage to be valid.
4. File the signed waiver with the plan and re-file your beneficiary designation naming your children (or a trust for their benefit).
5. For IRAs, update the beneficiary form directly. Consider naming a properly drafted trust as beneficiary if you want to control the timing and amount your kids receive.
6. Coordinate with your estate attorney so the beneficiary designations, trust, and will all point the same direction. Beneficiary forms beat wills every time.

The Trap That Voids Everything

The biggest gotcha: a prenup signed before the wedding is not a valid ERISA waiver. Courts have repeatedly ruled that a fiance cannot waive spousal rights she does not yet legally have. Only a post-marriage signature counts. Skip that step and every dollar in your 401(k) can be redirected to your new spouse regardless of what the prenup, the will, or your kids’ beneficiary designation says.

Two other traps worth knowing. First, rolling a 401(k) to an IRA before the waiver is signed strips the ERISA protection but also removes the requirement, which can help or hurt depending on your goal (in community-property states, it can still hurt). Second, on the income side, a 2.8% 2026 Social Security COLA and 1.68% national average 12-month CD rate mean your new spouse may lean harder on your accounts than you expect, so plan the waiver conversation with that reality in mind.

One form, one notary, one signature after the wedding. That is what actually keeps the money going where you promised it would go.

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