Beneficiary Designations: The Most Overlooked Part of Every Estate Plan

Why Beneficiary Designations Override Everything Else

When you open a 401(k), IRA, life insurance policy, or annuity, you fill out a beneficiary designation form. That form is a contract between you and the financial institution. It supersedes your will, your revocable trust, and any other estate document.

This is not a technicality. It is how the law works. If your will says "everything goes to my children" but your IRA beneficiary form still lists your ex-spouse, your ex-spouse gets the IRA. Your children get nothing from that account, regardless of what the will says. Courts have upheld this repeatedly, including a well-known Supreme Court case (Kennedy v. Plan Administrator for DuPont, 2009) where the deceased's ex-wife received his entire 401(k) because the beneficiary form was never updated after the divorce.

I have seen this happen more times than I would like. A family spends $10,000 on a trust and estate plan, then a $1.2 million IRA goes to the wrong person because nobody checked a form that takes 10 minutes to update.

The Most Common Mistakes I See

1. The Ex-Spouse Problem

After a divorce, people update their wills. They rarely update their beneficiary forms. The 401(k) at a former employer, the life insurance policy purchased 15 years ago, the old IRA at a custodian you forgot about: these accounts still have the original beneficiary designation on file. Divorce decrees do not automatically change beneficiary designations on non-ERISA accounts (and even ERISA plan administrators often require an affirmative change).

2. No Contingent Beneficiary

Many people name a primary beneficiary but leave the contingent beneficiary blank. If your primary beneficiary dies before you (or at the same time, in an accident), the account defaults to your estate. That means it goes through probate, loses the stretch distribution benefits for inherited IRAs, and may be subject to creditor claims that a properly designated beneficiary would have avoided.

3. Naming Your Estate as Beneficiary

This is surprisingly common. Some people intentionally name "my estate" as the beneficiary, thinking the will or trust will handle the distribution. The problem: when an IRA or 401(k) is payable to an estate, the account loses the ability to stretch distributions over the beneficiary's lifetime (or even the 10-year rule). Instead, the entire account must be distributed within 5 years if the owner died before required beginning date. That accelerates the tax hit dramatically.

4. Outdated Percentages or Missing Names

A client has three children but the beneficiary form, filled out 20 years ago, lists only two. Or the form splits the account 50/50 between a spouse and a child, when the intent was 100% to the spouse. These mismatches create family conflict and sometimes litigation.

What Is the Difference Between Per Stirpes and Per Capita?

When you name beneficiaries, you typically choose between "per stirpes" and "per capita" distribution. The difference matters when a beneficiary dies before you.

Per stirpes means "by branch." If you name your three children as equal beneficiaries per stirpes, and one child predeceases you, that child's share passes to their children (your grandchildren). Each branch of the family receives its proportional share.

Per capita means "by head." If one child predeceases you, their share is divided equally among the surviving children. Your deceased child's children receive nothing from that account.

Most families I work with prefer per stirpes because it preserves the family tree structure. But the default varies by institution, and some forms do not even ask. If your beneficiary form does not specify, ask the custodian what the default is and make an affirmative election.

Should You Name a Trust as Your IRA Beneficiary?

In some situations, naming a trust as the beneficiary of a retirement account makes sense. A trust can protect assets from a spendthrift heir, a beneficiary's creditors, or a child's future divorce. It also provides control over the timing and amount of distributions.

But naming a trust as IRA beneficiary has tax consequences. The trust must be a "see-through" (or "look-through") trust to qualify for the 10-year distribution rule under the SECURE Act. That means it must meet specific IRS requirements: it is valid under state law, it is irrevocable at death, the beneficiaries are identifiable, and the trust documentation is provided to the IRA custodian.

If the trust does not qualify as a see-through trust, the IRA may be forced into an accelerated distribution schedule, creating a tax event the family did not anticipate. I always coordinate with the client's estate attorney to make sure the trust language works with the IRA custodian's requirements.

For more on how the SECURE Act changed inherited IRA rules, read my article on the 10-year rule and planning around it.

How to Audit Your Beneficiary Designations

I recommend a full beneficiary audit at least once a year, and always after a major life event: marriage, divorce, birth of a child, death of a beneficiary, or a significant change in net worth.

Here is the process I walk clients through:

• List every account with a beneficiary designation. This includes 401(k)s (current and former employers), IRAs, Roth IRAs, life insurance policies, annuities, HSAs, and transfer-on-death brokerage accounts.
• Pull the current designation on file. Do not assume you remember. Log into each account or call the custodian and request a copy of the current beneficiary form.
• Check primary and contingent beneficiaries. Are both filled in? Are the names correct? Are the percentages what you intend?
• Verify per stirpes vs. per capita elections. If the form does not specify, contact the institution and make an affirmative choice.
• Confirm alignment with your estate plan. If your trust is supposed to receive retirement assets, verify the trust is named correctly on the form (use the exact legal name and date of the trust, not just "my trust").
• Document everything. Keep a master list of accounts, beneficiary names, and the date each form was last updated. Share this list with your estate attorney and financial advisor.

This audit is one of the first things I do with new clients. It is also one of the items I review during annual planning meetings. The trust and estate planning work I do with families always includes a beneficiary designation review as part of the process.

How Often Should You Review Beneficiary Designations?

The families who avoid beneficiary designation problems are the ones who build a review habit. I tie the beneficiary review to an annual planning meeting, usually in the fourth quarter, so it happens alongside tax planning and portfolio rebalancing.

It takes 30 minutes per year. Compare that to the cost of a beneficiary dispute, which can involve litigation, tax penalties, and family relationships that never recover. The review is one of the highest-value, lowest-effort activities in financial planning.

If you have not reviewed your beneficiary designations in the past 12 months, or if you have gone through a divorce, remarriage, or the birth of a child since the forms were last updated, start there. It is the single most impactful thing you can do for your estate plan today.