Beneficiary Designations: Why They Override Your Will

A will can say whatever you want. For a 401(k), an IRA, or a life insurance policy, it often doesn't matter — because those accounts pass to whoever is named on the beneficiary designation form, regardless of what a will, a trust, or any other estate planning document says otherwise. This single fact is the source of some of the most common, and most preventable, mistakes in estate planning.

Why Beneficiary Designations Override a Will

Retirement accounts, life insurance policies, and certain other assets pass by contract, not through the probate process that a will governs. When you open a 401(k), an IRA, or a life insurance policy, you name a beneficiary directly with the plan administrator, custodian, or insurance company — and that designation is what controls at your death, independent of your will. A will only controls assets that don't have their own separate transfer mechanism; for accounts with a beneficiary designation, the will simply never comes into play.

This means an outdated designation — naming an ex-spouse, a beneficiary who has since died, or simply the wrong person after a life change — is not corrected by a will that says something different. The account will pay out according to whatever is on file, even if it obviously contradicts the deceased's actual, current intentions.

ERISA Plans vs. IRAs: Different Rules Apply

Employer-sponsored retirement plans — 401(k)s, most pensions — are governed by ERISA, a federal law. For these accounts, the named beneficiary on file generally controls, and federal law can override even state-law defaults or an express provision in another document if the plan's own paperwork wasn't updated. This federal preemption is strong enough that a written waiver in an unrelated legal document does not necessarily override an ERISA plan's beneficiary form — the plan administrator is generally required to follow what the plan's own designation says.

IRAs are not ERISA-governed — they are individual accounts under the tax code, not employer plans. State law plays a larger role for IRAs than it does for 401(k)s, and some states have default rules that behave differently than the federal ERISA framework. Because the rules genuinely differ between account types, the safest approach is the same regardless: don't rely on a general assumption about how a life event affects a designation — check and update the actual form on file with each account.

The Complete Review Checklist

A thorough beneficiary review — done initially and again after any major life event — should cover every account and policy that passes by designation, not just the largest one: employer-sponsored retirement plans (401(k), 403(b), pension); IRAs (traditional and Roth); life insurance policies, including any employer-provided group coverage; brokerage account transfer-on-death (TOD) or payable-on-death (POD) designations; and any trust that itself names beneficiaries, or that is named as a beneficiary on other accounts.

When to Review: The Life Events That Matter Most

Beneficiary designations should be reviewed at least once as part of an initial estate plan, and again after: marriage or divorce; the birth or adoption of a child; the death of a previously named beneficiary; a significant change in your relationship with a named beneficiary; starting a new job (a new employer plan means a fresh designation, not a carryover of an old one); and any major change in the complexity of your estate — for example, creating a trust that should now be named as beneficiary on certain accounts.

Special Circumstances Change the Analysis

The general principles above apply broadly, but two situations specifically change what the "right" beneficiary designation looks like, and each has dedicated coverage on this site:

A beneficiary with a disability who receives means-tested government benefits. Naming a person with a disability directly as a beneficiary on a retirement account or life insurance policy — rather than a properly structured special needs trust — can immediately disqualify them from Supplemental Security Income and Medicaid. See What Is a Special Needs Trust (SNT)? and First-Party vs. Third-Party SNT for why the trust, not the individual, should typically be named in this circumstance.

Divorce. State "revocation upon divorce" statutes automatically remove an ex-spouse as a beneficiary for many types of assets — but, as established by U.S. Supreme Court precedent, this does not reliably apply to ERISA-governed plans, where the named beneficiary on file can still control even after a divorce is final unless the designation is affirmatively updated. See Updating Beneficiary Designations After Divorce for the complete mechanics, including the specific case law and the difference between how ERISA plans and IRAs handle this situation.

There Is No Grace Period

The most important practical takeaway: none of this corrects itself automatically, and there is no window of time to fix an outdated designation after the fact. If death occurs before a designation is updated, the outcome is determined by whatever was on file at that moment — not by intent, not by a will that says something different, and not by what "should have" happened. This is why a beneficiary designation review is consistently recommended as one of the first steps after any major life event, rather than something to handle "eventually" alongside broader estate planning.

What This Page Does Not Cover

This page covers the general mechanics and review process for beneficiary designations. For the divorce-specific revocation statutes and the relevant Supreme Court case law, see Updating Beneficiary Designations After Divorce. For naming a special needs trust as beneficiary for a beneficiary with a disability, see What Is a Special Needs Trust (SNT)?. For how a trust protector can help adjust beneficiary designations and other trust terms in response to changing circumstances, see What Is a Trust Protector?.

California Note

California is a community property state, which adds a layer of complexity even before any of the above situations arise: a spouse generally has a community property interest in a retirement account funded during the marriage, regardless of whose name is on the account, and some plan administrators require a spouse's written consent before allowing someone other than the spouse to be named as beneficiary of more than a portion of the account's value. This is a separate issue from the revocation-on-divorce question covered elsewhere — it applies during an intact marriage, not just after its end — and is worth confirming directly with the plan administrator when a California resident wants to name someone other than their spouse as a retirement account beneficiary.

This article is for educational purposes only and does not constitute legal, tax, or financial advice. Beneficiary designation rules vary by account type, plan type, and state, and the consequences of an outdated designation can be significant and difficult to reverse after death. Consult a qualified estate planning attorney to review and update all beneficiary designations as part of a complete estate plan.