Beneficiary Designation Overrides Your Will: The #1 Estate Planning Mistake in 2026

# Beneficiary Designation Overrides Your Will: The #1 Estate Planning Mistake in 2026

> **Quick answer:** Yes — a beneficiary designation on your 401k, IRA, life insurance policy, or bank account legally overrides your will. The U.S. Supreme Court confirmed this in *Hillman v. Maretta* (2013), ruling that federal law controls beneficiary designations on these accounts, and your state's estate laws — including whatever your will says — cannot override them. The single most common mistake: updating your will after a divorce while forgetting to update the beneficiary on your retirement account, leaving your ex-spouse legally entitled to the entire balance.

Most Americans believe a carefully written will is the foundation of their estate plan. It is not. Your beneficiary designation forms — the ones you filled out on your first day at a new job and promptly forgot — are more powerful than any will your attorney drafted. And according to estate planning attorneys across the country, the majority of Americans have at least one beneficiary designation that is outdated, incorrect, or flat-out dangerous.

This article is for informational purposes only and does not constitute legal advice. Consult a qualified estate planning attorney for guidance specific to your situation.

## Why Beneficiary Designations Legally Beat Your Will Every Time

To understand why this matters, you need to understand how assets transfer at death. There are two categories: