What Happens to Retirement Accounts (401k/IRA) After Death?
Retirement accounts don't pass through a will — they pass to whoever is named on a beneficiary form. Here's how 401(k)s and IRAs are actually inherited, and why the paperwork matters more than people think.
Of all the assets someone leaves behind, retirement accounts follow some of the least intuitive rules. A 401(k) or IRA doesn't pass through a will, and it doesn't go through probate. It goes directly to whoever is named on the account's beneficiary designation form — a separate piece of paperwork most people fill out once, when they open the account, and never think about again.
That single form controls the outcome, regardless of what a will says, regardless of family expectations, and regardless of how long ago it was filled out.
Checking your beneficiaries is one step in getting your affairs in order.
The Beneficiary Form Overrides the Will
This is the detail that catches the most families off guard: if a will says one thing and the beneficiary form on file with the plan administrator says another, the beneficiary form wins. It doesn't matter how recently the will was updated, or how clearly it states the deceased's intentions — retirement accounts and life insurance policies pass according to whatever paperwork is on file with the institution, full stop.
This is also why an outdated form is one of the more common estate-planning mistakes: someone updates their will after a divorce or remarriage but forgets the retirement account still lists an ex-spouse as beneficiary.
If a Spouse Is the Beneficiary
A surviving spouse has more flexibility than any other type of beneficiary:
- They can roll the account into their own IRA or 401(k), treating it as if it had always been theirs — which means using their own life expectancy for future required withdrawals.
- They can keep it as an inherited account instead, which can matter if they're under 59½ and might need penalty-free access to the funds before that age.
- Required minimum distributions can generally be delayed until age 73 if the account is rolled into the spouse's own retirement account.
Taxes still apply to any withdrawals either way — inheriting the account doesn't make the money tax-free, it just changes the timeline and flexibility around accessing it.
If a Non-Spouse Is the Beneficiary
Non-spouse beneficiaries — adult children, siblings, friends, or anyone else named on the form — face more restrictive rules. Following changes under the SECURE Act, most non-spouse beneficiaries are subject to the 10-year rule: the entire inherited account generally has to be emptied by the end of the tenth year following the original owner's death.
Within that window, if the original owner had already started taking required distributions before they died, the beneficiary typically has to continue taking distributions in years one through nine, with everything else withdrawn by the end of year ten. If the original owner hadn't started taking distributions yet, the beneficiary generally has more flexibility in how they spread withdrawals out — as long as the account is fully drained by the ten-year mark. Missing that deadline can trigger a significant penalty on whatever's left in the account.
Non-spouse beneficiaries also can't roll the funds into their own retirement account — they can only open an inherited IRA, which comes with its own set of rules.
If No Beneficiary Is Named at All
When a beneficiary form is blank or was never filed, the plan's default rules take over — which often, but not always, directs the account to a surviving spouse. In some cases, it instead falls back into the probate process entirely, which can delay access to the funds for months and expose them to estate creditors and probate costs that a named beneficiary would have avoided.
Why This Matters More Than People Realize
An estimated one in five 401(k) accounts in the U.S. sits lost or forgotten — often because the original account holder changed jobs, never rolled the account over, and nobody in the family knew the account existed by the time they died. A retirement account with an outdated or missing beneficiary form is, in practical terms, indistinguishable from a lost account: the money is real, but nobody knows to look for it, or the paperwork doesn't reflect who should actually receive it.
The Bottom Line
Retirement accounts follow their own set of rules, separate from a will and separate from probate — and those rules are only as good as the beneficiary form actually on file. A well-written will means very little if the 401(k) beneficiary form still lists someone from decades ago, or if nobody in the family even knows the account exists.
The Only Step helps close that gap by giving you one secure place to record every retirement account, along with who's named on it — so your family isn't left trying to track down an old 401(k) from memory, or discovering years later that a beneficiary form was never updated.
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