You open an IRA in your twenties. You name your sibling because that makes sense at the time. Fifteen years later, you’re married, have children, and your will says everything goes to your spouse and kids.
The old IRA form is still sitting there. That can matter more than the will.
A will doesn’t control every asset
Many assets pass outside probate. That includes accounts or policies with a valid beneficiary designation, plus certain trusts and jointly owned assets. So when a beneficiary form and a will appear to conflict, the beneficiary form often controls the account it belongs to.
The will controls something else: the probate estate. Different documents. Different assets.
Accounts where this often matters
| Asset | Does a will usually control it? |
|---|---|
| 401(k) / employer plan | Usually no |
| IRA | Usually no if a valid beneficiary exists |
| Life insurance | Usually no |
| POD bank account | Usually no |
| TOD brokerage account | Usually no |
| Property passing through probate | Often yes |
POD and TOD designations have to be set up.
They don’t magically appear on ordinary bank or brokerage accounts.
The spouse exception can change everything
Employer retirement plans governed by ERISA have important spousal protections. For many 401(k) plans, a spouse is generally the primary beneficiary unless they consent to someone else being named, typically in writing and with required formalities. IRAs work differently.
Most IRA owners can name a non-spouse beneficiary without the same federal spousal-consent rule, although community-property law can still matter. That’s why “beneficiary form always wins” is too simple.
Divorce is where assumptions get dangerous
People often assume divorce automatically fixes an old beneficiary form. Sometimes state law does revoke an ex-spouse designation. Sometimes federal ERISA rules override state law.
A divorce decree or QDRO can also create separate rights. Don’t assume.
Review the actual designation after the divorce. The provider’s record is what needs fixing.
Review after major life changes
Check beneficiaries after:
- marriage
- divorce
- remarriage
- birth or adoption
- death of a beneficiary
- opening or rolling over retirement accounts
Also name a contingent beneficiary where the account allows it.
Future you won’t remember every form future you signed.
Minors and trusts deserve extra care
Naming a minor directly can create administrative problems because minors generally can’t manage substantial assets themselves.
Trust beneficiaries can also create complicated tax and distribution rules, especially with retirement accounts.
Those are good reasons to involve an estate-planning attorney rather than improvising.
The easiest practical rule
If the beneficiary is wrong, update the beneficiary. Don’t assume the will repairs it. And after you make the change, keep confirmation that the provider accepted it.
Estate planning contains enough surprises already. This one is preventable.
Related Reading
401(k) vs. IRA: What’s the Difference and Which Do You Need?
What to Do With Your Old 401(k) After You Change Jobs
Sources & Last Updated
Last updated: August 2026. General educational information only; not personalized financial, tax, or legal advice.