Your Will Has No Authority Over Your Retirement Account
Many people assume a will controls all assets after death, but some of people’s most valuable assets, including retirement accounts, life insurance policies, and certain bank accounts, do not pass through a will at all. Instead, these assets are controlled by beneficiary designations filed with financial institutions.
Retirement accounts pass by contract, not through your trust. The financial institution looks at the beneficiary form on file and pays whoever is named. Your living trust, your will, the handwritten note in the desk drawer, none of that matters.
The Beneficiary Form Always Wins
An outdated or incorrect beneficiary designation is the single most common mistake that can unravel an otherwise solid estate plan, and it typically overrides your will. Beneficiary forms are contractual documents, which means the custodian pays exactly who the form names, regardless of what a will says.
Beneficiary forms on retirement accounts often override the instructions in a will. IRAs and 401(k)s follow contract rules that direct funds to the people named on those forms, even when families expect a different outcome. That can feel stunning to families who believed a carefully worded will would protect everyone.
The Ex-Spouse Scenario: A Very Common and Very Costly Mistake
Many people assume that a will can override a beneficiary designation, but this is not the case. If your retirement account lists your ex-spouse as the beneficiary, and your will leaves the account to your children, the ex-spouse will still inherit unless the designation is updated.
Consider this scenario: you divorced ten years ago and remarried five years ago. Your ex-spouse is still the beneficiary on your 401(k) from your old employer. Your current spouse and children get nothing from that account. It sounds improbable, but estate planning professionals report seeing this with striking regularity.
Most Americans Don’t Even Know Who Their Beneficiary Is
Oftentimes individuals do not know who is listed on their beneficiary forms because the account and beneficiary designations were created many years ago. This is especially common with workplace retirement plans started early in a career, when someone might have listed a parent or a first partner without a second thought.
Marriage, divorce, the birth of a child, the death of a loved one, or even major financial changes can all affect who should receive your retirement assets. Yet many people never revisit their beneficiary forms after initially completing them. This can lead to outdated or unintended outcomes.
Old Employer Plans Are a Forgotten Landmine
Former employer 401(k)s, pensions, or annuities may still exist under outdated beneficiary designations from years ago. These accounts can quietly drift out of alignment with your current plan. Changing jobs is a major life event, but updating retirement beneficiaries rarely makes anyone’s to-do list during a job transition.
A 401(k) from a job you left a decade ago can still carry a beneficiary designation from that era. Old employer plans and dormant policies are the easiest accounts to lose track of, precisely because you don’t interact with them regularly. Out of sight, out of mind, and potentially out of the right hands.
Naming Your Estate as Beneficiary Creates a Tax Nightmare
Listing “my estate” as the beneficiary is a serious mistake. When a large IRA names your estate, instead of beneficiaries taking distributions over time and keeping funds tax-deferred, the IRA may be forced into faster distribution rules, accelerating taxes and pushing heirs into higher brackets. The fix is to always name individual beneficiaries or a properly structured trust.
If no designated beneficiary exists or if the form contains errors, the account balance may become part of the deceased’s estate and enter the probate process. Probate is slow, public, and expensive, and it erases one of the main financial advantages that retirement accounts offer in the first place.
Naming a Minor Child Directly Triggers a Different Problem
Naming a child directly risks court-appointed guardianship of the funds. A trust, or a custodial account under your state’s UTMA statute, keeps the money out of probate court and gives you control over when the child gets access.
Your eight-year-old cannot take legal title to a $400,000 IRA. When a minor is named directly, a court must appoint a guardian to manage the funds until the child reaches adulthood. That process adds legal costs and removes the flexibility the original account holder likely intended.
The SECURE Act Changed the Rules for Inherited IRAs, and Most Families Don’t Know It
Under the SECURE Act, most non-spouse beneficiaries who inherited IRAs after January 1, 2020, must fully deplete the account within 10 years of the original account owner’s death. This is known as the 10-year rule, and it replaced the old “stretch IRA” option for many beneficiaries.
The SECURE Act of 2019 and additional IRS regulations in 2022 created new rules that apply to non-spouse beneficiaries who inherit from original depositors who passed away in 2020 or later. The IRS finalized most of the new inherited IRA rules in 2024, and these rules went into effect in January of 2025. The practical effect is that beneficiaries who delay withdrawals now face a compressed tax timeline and potentially significant penalty exposure.
The penalty is no longer being waived for tax year 2025 and beyond. That means failing to take required minimum distributions from certain inherited IRAs in 2025 could trigger a 25% excise tax.
The Forgotten Contingent Beneficiary Problem
You should name both primary and contingent beneficiaries on your plans in case the primary beneficiary predeceases you. Without a contingent, when the primary beneficiary is already gone, the account may default to your estate and land in probate, erasing the very benefit that a named beneficiary was meant to provide.
Beneficiary designation mistakes are among the most expensive and emotionally damaging financial errors families make, not because they are complicated, but because they are overlooked. There are situations where the policy itself was appropriate, the investment strategy was sound, and the estate documents were professionally drafted, yet one outdated or incomplete beneficiary form completely changed the outcome.
Fixing It Is Simpler Than Most People Expect
A good rule of thumb is to review all beneficiary designations after any major life event and at least once every few years. This includes employer retirement plans, IRAs, annuities, and life insurance policies. The process of updating a form is typically straightforward and takes only minutes through a financial institution’s online portal.
Pull up every retirement account, life insurance policy, and brokerage account, and confirm both primary and contingent beneficiaries are listed. Check that names, Social Security numbers, and dates of birth are exact, and that percentages add up to precisely 100%. If you’ve married, divorced, had a child, or lost a beneficiary in the past few years, update the forms now and save a confirmation copy.
Estate planning is not a one-time event. Regular updates ensure that your legal documents reflect your current wishes, relationships, and financial circumstances. The will gets the attention. The beneficiary form gets the money.
The Bottom Line
A retirement account can bypass nearly every document in an estate plan with a single outdated form. Millions of Americans assume their wills or trusts control who inherits their 401(k) or IRA balances, but beneficiary designations operate under separate legal rules that often override those instructions entirely.
Beneficiary mistakes are rarely intentional. They happen because life changes and paperwork does not always keep up. Keeping beneficiary designations clear and up to date helps ensure retirement assets are distributed as intended, while reducing delays, confusion, and difficult conversations for families.
The most carefully drafted will in the world cannot undo what a forgotten form decides. For the accounts that hold the most wealth, the beneficiary form is the document that matters most, and for most families, it hasn’t been looked at in years.
AI Disclaimer: This article was created with the assistance of AI tools and reviewed by a human editor.