Ex-Spouse Gets Your 401(k) If Beneficiary Goes Unchecked After Divorce

If you divorced and never changed your beneficiary forms, the person named on those forms can still collect your money, even when your divorce decree says your ex gets nothing. Whether that actually happens depends on one thing most people never think about: which law governs the account. Federal rules and California rules point in opposite directions, and the gap between them is where ex-spouses walk away with retirement savings and life insurance that were meant for children.

Key takeaways

• Employer plans like a 401(k), a pension, and group life insurance are governed by federal ERISA rules, which require the plan to pay whoever is named on the beneficiary form, and a divorce decree alone does not override that.
• California law automatically revokes some beneficiary designations that name a former spouse once a divorce is final, but that protection does not reach federally governed workplace plans.
• IRAs, individually owned life insurance, and payable-on-death accounts each follow their own rules, so updating one does not update the others.
• The reliable fix is to request fresh beneficiary forms from every custodian and plan administrator after a divorce, then confirm in writing that each change was recorded.

Does my ex still get my 401(k) if I forgot to update the beneficiary after divorce?

In most cases, yes. A 401(k), a traditional pension, and employer-provided group life insurance are governed by a federal law called ERISA. Under ERISA, the plan administrator is required to pay the person listed on the beneficiary form, following the plan documents as written. A divorce settlement, a will, or even a judge’s order that your ex gets nothing generally does not change who the plan pays, because federal law overrides state law in this area.

The U.S. Supreme Court has reinforced this more than once, holding that plan administrators follow the beneficiary designation on file rather than sorting through divorce paperwork. So if you named your spouse on a 401(k) in 2005, divorced in 2015, and never filed a new form, your former spouse may legally collect that balance when you die, even if they remarried and you have children who were supposed to inherit it.

There is one narrow exception worth knowing. If your divorce produced a Qualified Domestic Relations Order (a QDRO) that specifically assigns part of the plan, that order can control that slice. Outside of a valid QDRO, the beneficiary form wins.

Does California automatically remove an ex-spouse as beneficiary after divorce?

Partly, and the word “partly” is where families get burned. California law does automatically revoke certain transfers to a former spouse once a marriage is legally dissolved, which can apply to things like payable-on-death bank accounts and some individually owned policies. On paper, that sounds like a safety net.

The problem is that this state-level revocation does not apply to ERISA-governed workplace plans, because federal law preempts it. So the automatic protection covers some of your accounts and skips the ones that often hold the most money. It also may not cleanly apply to every IRA or custodian agreement, since those can turn on both state law and the contract you signed with the custodian. Relying on the state to clean up after you leaves gaps you cannot see without reading each account’s rules.

California also layers in community property questions, remarriage risk, and Proposition 19 reassessment issues on real estate, all of which can scramble a plan built around an outdated beneficiary form. For families who want an inheritance to actually reach their children, this is one of the common legacy missteps that quietly undoes years of saving.

Which accounts do I need to check after a divorce?

Check every account that pays out by beneficiary designation or title, not just the obvious ones. Each type follows its own rulebook, and assuming they all work the same way is how an ex-spouse ends up with the house money.

Account type	Governing rules	What happens if you never update it	Does divorce revoke it automatically?
401(k), pension, employer group life insurance	Federal (ERISA)	Plan pays the named person; your ex can collect	No, the form controls
Traditional or Roth IRA	State law plus custodian agreement	Outcome varies by state and custodian	Sometimes, not guaranteed
Individually owned life insurance	State law	May revoke an ex, but confirm with the insurer	Often, in California
Payable-on-death / transfer-on-death accounts	State law	May revoke an ex-spouse designation	Often, in California
Revocable living trust	The trust’s own terms	Pays exactly as the trust reads today	No, you must amend it

Notice that the two rows with the biggest balances for most retirees, the workplace retirement plan and the IRA, are the two least likely to protect you automatically. That pattern is not an accident of bad luck. It is how the law is actually built.

Which account is the riskiest one to forget?

The old 401(k) from a job you left years ago is the single most dangerous account to overlook. I say that for three reasons tied to how people actually live. The balance is usually large because it grew for decades. The beneficiary form was filled out at hire, often while you were newly married and not thinking about it. And once you leave an employer, you stop logging into that account, so the ex-spouse named on it never crosses your mind again.

Individually owned life insurance runs a close second, because a policy bought to protect a spouse rarely gets a second look once the marriage ends. Both of these pay out by beneficiary designation, both can hold six figures or more, and both are easy to leave frozen in the past. When high-net-worth families tell me their estate plan is “handled,” these are the two accounts I ask to see first.

What should I update after a divorce is final?

Update every beneficiary form and every document that controls where money and property go, then verify each change landed. A divorce is one of the clearest moments to run this list, and it pairs with the other changes to make after a major life event.

Here is the practical sequence I walk clients through:

1. Request new beneficiary forms for every retirement plan, IRA, annuity, and life insurance policy, name primary and contingent beneficiaries, and keep the dated confirmation.
2. Amend your revocable living trust and will so the distributions and any remarriage protections reflect your new situation. A trust pays exactly as it reads today, not as you wish it read.
3. Replace your powers of attorney and health care directive if your former spouse was named as your agent.
4. Review account titling and real estate, since community property and Proposition 19 reassessment can change what makes sense after a split.
5. Coordinate the pieces so your beneficiary forms, trust, tax plan, and insurance all tell the same story. A form that contradicts your trust is a lawsuit waiting to happen.

If you have children, step 2 matters more than people expect. A trust can keep an inheritance with your kids even if a former spouse remarries, and it can shield what they receive from their own future divorce. That is the heart of protecting an inheritance through divorce, and a bare beneficiary form cannot do it.

How do I make sure nothing slips through the cracks?

Treat beneficiary updates as part of a coordinated plan rather than a box you check once. The reason ex-spouses still collect is almost never that the accounts cannot be fixed. It is that no one owns the follow-through, so one old form survives a divorce that changed everything else.

At WE Alliance Wealth Advisors, we have worked with high-net-worth families since 1992, and we review beneficiary designations alongside the trust, the tax plan, and the insurance so the documents agree with each other. Our advanced estate and tax planning work is handled in collaboration with Strategic Wealth Legal Advisors, which lets the legal documents and the investment plan line up instead of working against each other. Our advisor team holds credentials including a J.D., the CFP designation, and a California insurance license, so the financial and legal sides are read together.

If you have been through a divorce and are not certain every account has been updated, that uncertainty is worth resolving before it becomes your family’s problem to litigate. You can start a review at weriaadvisors.com or call 916-325-0130, and our team will reach out the next business day.

Frequently asked questions

Does a divorce decree automatically override my beneficiary designations?

No, not reliably. For federally governed workplace plans like a 401(k), a pension, or employer group life insurance, the plan pays whoever is named on the form regardless of what the divorce decree says. A divorce decree can only reach those plans through a valid Qualified Domestic Relations Order. For accounts governed by California law, a divorce may revoke an ex-spouse designation automatically, but you should confirm each one rather than assume.

Can my ex-spouse legally keep my life insurance payout after divorce?

It depends on who owns and governs the policy. Employer-provided group life insurance falls under federal ERISA rules, so the insurer pays the named beneficiary even if that person is your ex. An individually owned policy governed by California law may have the ex-spouse designation revoked after divorce, but the safest step is to file a new beneficiary form and get written confirmation from the insurer.

What happens to my IRA if my ex is still listed as the beneficiary?

An IRA is not governed by ERISA, so the outcome turns on state law and the custodian agreement you signed. In some situations a divorce may revoke a former spouse as beneficiary, and in others it may not, which is why you cannot treat an IRA the same way you treat a 401(k). File an updated beneficiary form directly with the IRA custodian and keep the dated confirmation.

How soon after a divorce should I update my beneficiaries?

As soon as the divorce is final, and ideally you should have the new forms ready to file the day it is. There is no grace period that protects you, and if you die with an outdated form on an ERISA plan, the named ex-spouse can collect. Updating every account at once, alongside your trust and powers of attorney, closes the gap before it can be used against your intended heirs.

Will updating my will fix an outdated beneficiary on my retirement account?

No. A beneficiary designation on a retirement account, annuity, or life insurance policy generally controls over whatever your will says, because those assets pass by contract outside of probate. Your will can distribute probate property, but it does not override the form on file with a plan or custodian. You have to change the beneficiary designation itself for that account.