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,” regardless of what your will, your prenup, or your existing 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 requires 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 this framework in two landmark decisions. In Boggs v. Boggs (1997), the Court held that ERISA preempts state community property law, meaning a non-participating spouse cannot use state law to override the federal plan structure. Then in Kennedy v. Plan Administrator for DuPont Savings (2009), the Court established the plan-documents rule: the beneficiary designation form on file with the administrator controls, full stop, even over a divorce decree. Together, the cases make clear that ERISA rights can only be waived by the spouse in writing, after marriage, on the plan’s own forms.

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. The exception is the nine community-property states, where contributions made during marriage may be treated as joint property: Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin. Check local rules carefully if you live in any of those states.

That IRA distinction matters more than most people realize. A lot of remarrying retirees roll their 401(k) into an IRA and never consider that they just changed the rulebook on who controls the beneficiary.

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 downloaded from 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 fiancee cannot waive spousal rights she does not yet legally hold. 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’ prior beneficiary designation says.

Two other traps are worth knowing. First, rolling a 401(k) into an IRA before the waiver is signed removes the ERISA spousal-consent requirement, which can help or hurt depending on your goal. In community-property states, that move can still create complications. Second, on the income side, a 2.8% 2026 Social Security COLA and a 1.71% national average 12-month CD rate mean a new spouse may lean harder on your investment accounts than you expect. Factor that reality into the waiver conversation early.

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

Editor’s note: This article has been updated to reflect the full list of nine community-property states (adding Idaho, Louisiana, Nevada, New Mexico, Washington, and Wisconsin to the three previously cited), to clarify the distinct holdings of Boggs v. Boggs and Kennedy v. DuPont, and to refresh the national average 12-month CD rate to 1.71% per FDIC data as of August 19, 2026.

Contact [email protected] for any questions or corrections.