Here is a fact that surprises many people: for a large share of your wealth, your will does not decide who gets it. A form you filled out years ago, often in a hurry on your first day at a job, does. Beneficiary designations control retirement accounts, life insurance and other assets, and they generally override what your will says. If you have a good will but outdated forms, your plan can fail in a single stroke.

This guide explains how beneficiary designations work, the most common mistakes and a simple review you can do this week.

What is a beneficiary designation?

It is an instruction, made directly with a financial institution or insurer, naming who receives an account or policy when you die. Because the account passes by contract, it goes straight to the named person, without going through your will or probate.

Which assets use beneficiary designations?

  • 401(k), 403(b) and other workplace retirement plans.
  • IRAs, both traditional and Roth.
  • Life insurance policies.
  • Annuities.
  • Pensions with survivor benefits.
  • Payable-on-death (POD) bank accounts and transfer-on-death (TOD) brokerage accounts.
  • Health savings accounts.
  • Some real estate, where a transfer-on-death deed is allowed.

For many families, these accounts are the biggest part of their wealth. A retirement account may be worth far more than the home.

Primary and contingent beneficiaries

A primary beneficiary is first in line. A contingent (or secondary) beneficiary receives the account if the primary has died or declines it. Many people name a primary only. If that person dies before you and you never updated the form, the account may default to your estate, and then go through probate, which defeats the purpose.

Name both, and consider adding a third level if your family is large.

Seven common mistakes

1. An ex-spouse is still named

Divorce does not always remove an ex-spouse from a beneficiary form. Depending on the account and the state, an ex may still collect. Courts have heard many such cases, including some that ended with the ex-spouse receiving funds the owner clearly did not intend. Check every form after a divorce.

2. No beneficiary, or a deceased one

If no valid beneficiary is named, the plan’s default rules apply. That may mean your estate, or your spouse, or something you did not choose. Defaults are rarely what people want.

3. Naming a minor child directly

Insurers will not usually hand a large sum to a child. A court may appoint a guardian for the money, which adds cost, delay and little flexibility, and the child may receive the entire amount at 18. Consider naming a trust, or a custodian under your state’s Uniform Transfers to Minors Act, with the help of an attorney.

4. Forms that conflict with your will

Your will may say “everything split equally between my three children,” while the retirement accounts name only one. The forms win. Review the whole picture together. See How to Split an Inheritance Fairly Between Siblings.

5. Forgetting spousal rights

Employer retirement plans governed by federal law, such as most 401(k)s, generally require the spouse to be the primary beneficiary unless the spouse signs a written consent to name someone else. In community property states, spouses may also have rights in other accounts. Do not rely on assumptions.

6. Naming “my estate” or “my children” loosely

Vague wording can cause confusion. Name people by full name, and consider using “per stirpes,” a legal term meaning a child’s share would pass to that child’s own children if the child died first. Ask the institution how its forms handle this.

7. Not updating after life events

Marriage, divorce, births, deaths, estrangements, new jobs and rollovers all call for a form review. When you roll over an old 401(k) into an IRA, you must complete a new form. The old one does not carry over.

The tax side: what beneficiaries should know

  • Life insurance death benefits are generally income-tax-free to the beneficiary.
  • Inherited traditional IRAs and 401(k)s are generally taxed as income when withdrawn. Most non-spouse beneficiaries must empty inherited accounts within 10 years, with exceptions for spouses, minor children of the owner, disabled or chronically ill beneficiaries and some others. Details can be complex, so beneficiaries should get advice.
  • Spouses have more options, such as rolling the account into their own.
  • Inherited Roth accounts are generally tax-free if the Roth was held long enough, but still often subject to the 10-year rule.
  • Estate tax: accounts with beneficiaries still count toward the estate when measuring estate tax. For 2026 deaths, the federal exemption is $15 million per person, and some states have lower thresholds.

A 30-minute beneficiary review

  1. List every account and policy that has a beneficiary. Use your statements and your employer’s benefits site.
  2. Log in and look at each designation. Print or save a screenshot.
  3. Check each one for: correct names, both primary and contingent, percentages totaling 100, and no outdated names.
  4. Compare with your will or trust. Do the pieces add up to the plan you want?
  5. Update what is wrong. Most institutions let you do this online.
  6. Keep a record in your family folder, with the date of your last review. See The Family Folder: 11 Documents Your Heirs Need.
  7. Tell your executor and loved ones that the list exists.

When to involve a professional

  • You have a blended family, a child with special needs or a beneficiary who is a minor.
  • You want to leave money to a trust or charity.
  • You own a business or large retirement accounts.
  • You are going through divorce or remarriage.

An estate planning attorney can coordinate your will, trust and beneficiary forms so they work together. See Will vs. Living Trust: Which Does Your Family Need?

The takeaway

Your will is only part of your plan. For many families, the forms on file with banks, insurers and plan administrators decide who gets the most valuable assets. A half-hour review costs nothing and could save your family from heartbreak. Do it this week, and make it a yearly habit. For more on avoiding delays and fees, see What Is Probate, and How Do Families Avoid It?

This article is general education, not legal or tax advice. Rules vary by account type and by state.