The 401(k) Beneficiary Mistake That Sent $620,000 to an Ex-Spouse Instead of the Children

A 401(k) is governed by ERISA, which preempts state law on plan administration. The plan administrator must pay the person designated on the beneficiary form, and divorce decrees, wills, intent, and testimony do not change that result. State automatic revocation-on-divorce statutes can remove an ex-spouse from certain accounts governed by state law, but they do not apply to ERISA-covered retirement plans. A 401(k), 403(b), or private pension functions as a federal system separate from state-law treatment. A QDRO generally addresses the division of the balance at divorce and does not automatically update beneficiary designations for future contributions or growth, so later additions still pass to the named beneficiary.

"A common assumption is that a Qualified Domestic Relations Order, the legal instrument that splits retirement assets in divorce, also resets the beneficiary designation. A QDRO typically addresses only the split of the existing balance at the time of divorce. It does not change who inherits future contributions or future growth. If the man in the scenario contributed another $80,000 after his divorce and the market doubled it, every dollar still flows to the ex-spouse listed on the form."

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