June 16, 2026 7 min read
The Form That Outranks Your Will
In a blended family, who inherits your 401(k) is not named in your will. It's named on a form you filled out in 1998 and forgot.
Somewhere in a file you have not opened in years, there is a form. Your spouse signed it for their 401(k) in 1998 — before the divorce that ended their first marriage, before they met you, before the two of you started raising the kids you are raising now. On the line that asks who gets this money if I die, there is a name. It is probably not yours.
You have a will. It is in the fireproof box, notarized, exactly the way the lawyer told you. And when the worst happens, that will is going to lose to the form. Not because anyone was careless on purpose. Because that is the law, and the Supreme Court has said so twice.
The form beats the will. Always.
Some assets do not pass through your will at all. A retirement account, a life-insurance policy, a payable-on-death bank account — each of these carries a beneficiary designation, the name you wrote on the form when you opened it. That name receives the money directly, the moment you die, no matter what the will says. The will governs the house and the furniture and the savings account with no beneficiary on it. The form governs everything with a name on it. And in a blended family, the form is where the accidental disinheritance almost always happens.
Here is how it goes wrong, told by the man it happened to.
William Kennedy never changed his form.
When William Kennedy divorced, the decree was clean: his ex-wife waived all rights to his savings plan, in writing, signed. Years later he died. The plan administrator looked at the one document that mattered to them — the beneficiary form on file — and saw her name, never updated. So the plan paid her. Roughly four hundred thousand dollars that the divorce papers said she had given up.
His estate sued. In Kennedy v. DuPont (2009), a unanimous Supreme Court held that the plan was right to pay the named beneficiary. A waiver buried in a divorce decree is not the same as changing the form. (The Court left open whether the estate could claw it back through a separate suit — so it may not be definitively lost, but assume nobody wants to find out.)
The lesson is brutally simple. Your divorce did not update your beneficiary forms. You have to do that, by hand, one account at a time.
The 401(k) protects your spouse — but not the way you think.
There is one place the law steps in. For most employer-sponsored 401(k)s and pensions — plans governed by a federal law called ERISA, the Employee Retirement Income Security Act — your current spouse is the default beneficiary, automatically. To name anyone else, including your own children from a first marriage, your spouse has to sign a written consent witnessed in person by a notary or a plan representative. So a living spouse generally cannot be quietly cut out of a 401(k). That is the protection working.
But it has holes. The spousal rule usually requires you to have been married about a year. A prenuptial agreement does not count as the spouse’s consent — only that notarized form, signed after the wedding, does. Governmental and church plans are often exempt entirely. And — this is the trap — an IRA is not an ERISA plan. It has no federal spousal protection at all. Whoever is named on the IRA form gets it, full stop. (The nine community-property states layer on their own rules, so this is a sentence that ends with check your state.) People roll an old 401(k) into an IRA all the time and never notice they just walked the money out from under the one rule that was guarding it.
The safety net has a hole exactly where the money is.
You might be thinking: doesn’t divorce automatically erase an ex-spouse from these forms? Sometimes. About half the states have revocation-upon-divorce laws that cancel an ex-spouse beneficiary designation when a marriage legally ends, and the Supreme Court upheld one against a constitutional challenge in Sveen v. Melin (2018).
But only about half. Coverage varies. And the part that should keep you up at night: those state laws are preempted by federal ERISA for employer plans (the Court settled that in Egelhoff v. Egelhoff, 2001). So the safety net frays exactly where the biggest accounts usually sit — the 401(k), the pension. Never assume your divorce removed your ex from your employer retirement plan. For those plans, it almost certainly did not.
The law sees your stepchild as a stranger.
Now the hardest part, the part the statutes are coldest about. A stepchild you raised since infancy but never legally adopted, and an unmarried partner of twenty-five years — neither is an automatic heir. If you die without a will, a trust, or a beneficiary designation naming them, in most states they inherit nothing. Dying without a will is called intestacy, and intestacy laws hand your estate to blood and marriage, in that order. The child you tucked in every night is, to the probate court, a guest.
A few states soften this — California has a narrow statutory stepchild rule, some states recognize equitable adoption, a handful still honor common-law marriage — but you cannot count on landing in one of them. (A surviving spouse has more cover: in most non-community-property states, one written out of a non-ERISA estate can still claim a statutory minimum slice called the elective share, often a third to a half — check your state for the fraction.) The only reliable fix is to name the people you love, explicitly, on every form and in the will itself.
And while you are naming them, learn two phrases that decide whether their children are protected: per stirpes and per capita. Per stirpes (by branch) means if one of your children dies before you, that child’s share flows down to their kids. Per capita (by head) splits only among the survivors at that level — so the grandchildren of a child who died first can get nothing. These words live on beneficiary forms, not just wills, and the default when you leave it blank varies by state. Choose wrong, and you can silently disinherit a whole branch of grandchildren without anyone noticing until the money is gone.
Pull up one account right now. Whose name is on it — and is it still the name you’d choose?
What to do this month.
Log into every retirement account, every life-insurance policy, every payable-on-death account you have. Read the named beneficiary out loud. Read the contingent — the backup — beneficiary too; people forget the second line entirely. If a name surprises you, fix it now.
Then write down what each account is and where it lives. Not the passwords, not access — just an honest map, so the people you leave behind are not hunting through old statements during the worst week of their lives. The intentions, the why this person gets this, the story behind the choices — that is the kind of inventory we keep over here at Pass It On. It sits beside the legal documents; it does not replace them.
For the objects rather than the accounts, write a personal property memorandum — the small legal tool that lets a list of things carry real weight. And for the money that needs more than a form, ask an estate attorney about a QTIP trust (it can provide for a surviving spouse while guaranteeing the remainder goes to your kids) or a QDRO (a court order that splits a retirement plan cleanly after divorce). This is the page where I tell you, plainly, to call a lawyer.
Because here is the thing the forms cannot do. Paperwork protects the money. It cannot protect the relationships. The stepchild who gets a different share than the biological kids will wonder why, forever, unless you said it in your own words. The spouse you ask to sign a 401(k) waiver may flinch — don’t you trust me? — and the only thing that turns that flinch back into trust is the conversation where you explain that this is about the children from before, and about love, not suspicion. A will alone doesn’t settle that. Neither does a form. Only you can.
Sources
- Cornell Legal Information Institute — Kennedy v. Plan Administrator for DuPont Savings & Investment Plan (2009) — https://www.law.cornell.edu/supct/html/07-636.ZS.html
- Justia — Sveen v. Melin (2018) — https://supreme.justia.com/cases/federal/us/584/16-1432/
- Justia — Egelhoff v. Egelhoff (2001) — https://supreme.justia.com/cases/federal/us/532/141/
- Cornell Legal Information Institute — 26 CFR 1.401(a)-20, spousal consent — https://www.law.cornell.edu/cfr/text/26/1.401(a)-20
- Cornell Legal Information Institute — Elective Share — https://www.law.cornell.edu/wex/elective_share
- FindLaw — Per Stirpes and Per Capita Distribution — https://www.findlaw.com/forms/resources/estate-planning/last-will-and-testament/per-stirpes-and-per-capita-distribution-under-a-will-what-does-it-mean.html