Your Will Doesn’t Control Your 401(k): How Beneficiary Designations Actually Work

Many Missouri residents spend real money on a carefully drafted will, then unknowingly hand control of their largest asset to a form they filled out once, years ago, at a benefits enrollment meeting. Retirement accounts, life insurance, and payable-on-death accounts do not follow your will, they follow whoever is listed on the beneficiary form, no matter what your will says.

Here is how beneficiary designations actually work, and the mistakes that cause the most damage.

Does My Will Control Who Inherits My 401(k) or IRA?

No. Retirement accounts, life insurance policies, and payable-on-death bank accounts pass directly to whoever is named on the account’s beneficiary form, regardless of what your will says. These are called non-probate assets, and the beneficiary designation legally overrides even a will executed after the form was signed.

This surprises people because it runs against the natural assumption that a will is the master document controlling “everything.” In practice, your will only controls assets that do not already have a beneficiary designation or other transfer mechanism attached to them.

What Assets Are Controlled by Beneficiary Designations Instead of a Will?

Any account with a named beneficiary transfers automatically at death, bypassing your will and, in most cases, bypassing probate entirely. Common examples include:

• 401(k)s, 403(b)s, and pensions
• Traditional and Roth IRAs
• Life insurance policies
• Annuities
• Payable-on-death (POD) bank accounts
• Transfer-on-death (TOD) brokerage accounts
• Missouri beneficiary deeds on real estate (RSMo § 461.025)

Because these transfers happen automatically and outside probate, an outdated or incorrect beneficiary form can send a substantial asset to the wrong person with no opportunity for your executor or family to intervene after the fact.

What Are the Most Common Beneficiary Designation Mistakes?

The same handful of errors account for most of the problems we see in Missouri estates:

• Ex-spouse still listed, divorce does not automatically remove a former spouse from most beneficiary forms
• Deceased beneficiary never updated, often forces the account into probate anyway, defeating the purpose of the designation
• No contingent beneficiary named, if the primary beneficiary predeceases you with no backup listed, the account typically defaults to your probate estate
• A minor child named directly, minors cannot legally receive large account payouts, forcing a court to appoint a property guardian
• Beneficiary designations that contradict the will, creating family conflict even though the legal outcome is not actually in dispute

Should a Trust Be Named as Beneficiary Instead of a Person?

Naming a trust as beneficiary can make sense in specific situations, minor children, a beneficiary with special needs, or a blended family where you want to control distributions over time, but it requires careful drafting, especially for retirement accounts. Naming a trust incorrectly as an IRA beneficiary can trigger accelerated tax consequences that a properly drafted trust would have avoided entirely.

This is not a do-it-yourself decision. Whether a trust should be named, and how it must be structured to preserve tax treatment, depends on the type of account and your family’s specific circumstances.

How to Audit Your Beneficiary Designations

Pull the current beneficiary form for every retirement account, life insurance policy, and payable-on-death account you hold, most providers make this available through an online portal. Confirm the named primary and contingent beneficiaries still reflect your wishes, and confirm every form is consistent with the rest of your estate plan rather than working against it.

This audit takes far less time than most people expect, and it closes one of the largest gaps we see between what people believe their estate plan does and what actually happens at their death.

Working With a Missouri Attorney on Beneficiary Planning

An attorney at Mid-America Law Practice can review your full set of beneficiary designations alongside your will and trust, identify any conflicts, and advise on whether a trust should be named as beneficiary for accounts involving minor children or special circumstances.

General information on Missouri non-probate transfers and beneficiary deeds is available through the Missouri Judiciary website.

Frequently Asked Questions: Beneficiary Designations in Missouri

1. If my will says everything goes to my spouse, does that override my old life insurance beneficiary form?

No. The beneficiary form controls regardless of what your will states. Courts generally cannot redirect the payout to match the will.

2. Does divorce automatically remove my ex-spouse as beneficiary?

Not always, and not for every account type. You must proactively update each beneficiary form after a divorce to remove a former spouse.

3. What happens if I name a minor child directly as beneficiary?

Minors cannot legally receive large account payouts directly. A court typically must appoint a property guardian to manage the funds until the child reaches adulthood.

4. What happens if I don’t name a contingent beneficiary?

If your primary beneficiary predeceases you and no contingent beneficiary is listed, the account often defaults into your probate estate, losing its non-probate advantage.

5. Can I name a trust as beneficiary of my IRA?

Yes, but it requires careful drafting. An improperly named trust beneficiary on a retirement account can trigger accelerated tax consequences.

6. How often should I review my beneficiary designations?

Review them any time you review the rest of your estate plan, and immediately after any divorce, remarriage, birth, or death in the family.

About the attorney

Azra Ahmad, Founder & Managing Attorney

Azra focuses on estate planning, elder law, personal injury and traffic law for families across the St. Louis area. She earned her JD from Saint Louis University School of Law, is licensed in Missouri and Illinois, and is a member of The Missouri Bar, WealthCounsel and ElderCounsel. Before law, she worked as a speech-language pathologist with children and seniors.

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