Quick answer
A 401(k) passes directly to the named beneficiary — not through your will — so an outdated beneficiary form can hand years of savings to the wrong person, regardless of what your will says.
- Update your beneficiary designation after marriage, divorce, or birth of children — it overrides your will completely.
- Surviving spouses should consider a spousal rollover to delay distributions until age 73 and continue tax-deferred growth.
- Non-spouse beneficiaries must fully distribute inherited 401(k)s within ten years, requiring strategic timing to minimize tax impact.
A 401(k) can represent decades of discipline — years of contributions, employer matches, and investment growth that were supposed to fund retirement. When the account owner dies before or during retirement, the question of what happens next is one of the most financially consequential decisions a family will face.
The answer depends on who you named as beneficiary, your relationship to the deceased, and decisions made in the months following the death. Getting these decisions right can mean the difference between keeping the value intact and triggering a tax bill that erodes a significant chunk of it.
How a 401(k) Transfers at Death
Unlike assets that pass through a will, a 401(k) transfers directly to the named beneficiary by contract. The beneficiary designation you filed with the plan administrator controls who receives the account — regardless of what your will says. A will cannot redirect a 401(k) to someone other than the named beneficiary.
This is one of the most important estate planning concepts for anyone with retirement savings to understand. If your beneficiary designation names your brother but your will leaves everything to your spouse, your brother receives the 401(k). Courts have consistently upheld this principle, even in cases that feel deeply unfair to the people left behind.
In 2022, the Supreme Court ruled in Egelhoff v. Egelhoff that federal ERISA law preempts state laws that would otherwise revoke a beneficiary designation upon divorce. This means forgetting to update a beneficiary designation after a major life change can have serious, legally binding consequences.
The beneficiary receives the account separately from the estate — they generally do not need to wait for probate to resolve, though they will need to work with the plan administrator through a claims process.
Rules for Surviving Spouses
Spouses have the most favorable options under federal law. If you are the named beneficiary and the surviving spouse, you have choices that no other beneficiary has.
The most powerful is a spousal rollover. This lets you roll the inherited 401(k) directly into your own IRA, treating the account as if it were always yours. You can then delay taking required minimum distributions until you turn 73 (under current SECURE 2.0 Act rules), choose your own investments, and continue the account's tax-deferred growth on your own timeline.
A spousal rollover is almost always the most tax-efficient choice for a surviving spouse who does not immediately need the funds. By rolling the account into their own IRA, they avoid forced distribution rules and keep deferring taxes on the balance.
Alternatively, a surviving spouse can remain as a beneficiary and take distributions based on the original account holder's life expectancy or their own — which might make sense if they need access to funds before age 59½ without the early withdrawal penalty, a special rule that applies to inherited accounts.
Rules for Non-Spouse Beneficiaries
The rules for children, siblings, friends, and other non-spouse beneficiaries changed significantly with the SECURE Act in 2019 and SECURE 2.0 in 2022. Most non-spouse beneficiaries are now subject to the 10-year rule, which requires the entire account to be distributed within ten years of the original owner's death.
This is a major shift from the old rules that allowed "stretch" distributions over the beneficiary's lifetime — a strategy that let tax-deferred growth continue across decades. The 10-year rule accelerates the distribution schedule and, with it, the tax liability.
Within the ten-year window, there is no requirement about how distributions are timed, provided the account is fully distributed by December 31 of the tenth year following the owner's death. A beneficiary could take nothing for nine years and then take everything in year ten — though that would likely create a significant tax spike.
The strategic question for non-spouse beneficiaries is how to spread distributions across the ten-year period to minimize tax impact. This often means taking distributions in years when your own income is lower, or spreading withdrawals across multiple years to avoid jumping into a higher tax bracket.
Not every non-spouse beneficiary is subject to the 10-year rule. The law carves out "Eligible Designated Beneficiaries" who can still take distributions over their own life expectancy. This group includes minor children of the account owner (until they reach majority), disabled or chronically ill individuals, and individuals who are not more than ten years younger than the deceased.
For minor children of the account owner, the exception applies until they reach majority — at which point the 10-year clock begins. A 12-year-old who inherits a parent's 401(k) can take distributions over their life expectancy until age 18, and then has ten years from that birthday to fully distribute the account.
What Happens If There's No Beneficiary
If the account owner dies without naming a beneficiary — or if all named beneficiaries have died first — the account becomes part of the estate and passes through probate.
This is a significantly worse outcome. The account goes through probate, which means it is subject to creditor claims, court costs, and delays. The surviving spouse loses the advantageous rollover option. Depending on the estate's tax situation, the distribution may be far less efficient than a direct beneficiary transfer.
An estimated 25% of Americans with 401(k) accounts have never named a beneficiary, according to plan administrator data. For accounts that pass through estates rather than directly to beneficiaries, the average distribution is meaningfully reduced by administrative costs.
The fix is simple: log in to your 401(k) plan's website or contact your HR department and confirm that your beneficiary designation is on file and current. Five minutes of attention protects years of savings.
Required Minimum Distributions After the Owner Dies
If the account owner was already taking required minimum distributions (RMDs) at the time of death, the beneficiary must take at least the RMD for the year of death if the owner had not already taken it. This is not optional — failing to take it results in a penalty.
For subsequent years, distribution rules depend on the beneficiary's category as described above. Non-spouse beneficiaries subject to the 10-year rule must fully distribute the account by the end of the tenth year — and recent IRS guidance suggests that annual distributions may be required in years where the original owner was already subject to RMD rules.
Given the complexity here and the potential for significant tax penalties, consulting a tax professional or financial advisor is strongly recommended for beneficiaries navigating an inherited 401(k).
The Employer Plan vs. IRA Question
If the deceased person's 401(k) was held in an employer plan rather than an IRA, the beneficiary may have the option to leave the account in the employer plan or roll it to an inherited IRA. Rolling to an inherited IRA often provides more investment flexibility and more control over the distribution timeline.
Employer plans vary in their rules about inherited accounts. Some allow beneficiaries to remain in the plan for years. Others require immediate distribution. Contacting the plan administrator promptly — ideally within 60 days of the death — lets beneficiaries understand their options before any default rules kick in.
Protecting Your Family's Options
The decisions that determine how well your family can manage an inherited 401(k) are made before you die, not after. Naming beneficiaries, keeping them current, and making sure your spouse knows the account exists and who to contact are the three most important steps.
For a surviving spouse, understanding the rollover option in advance — so they can make an informed choice when the time comes rather than a panicked or uninformed one — is equally valuable. Consider discussing your 401(k) beneficiary designations explicitly with your spouse as part of your estate planning conversations.
The 401(k) represents some of your family's most significant financial assets. Treating the beneficiary designation with the same care as a will ensures those assets reach the right people, at the right time, with the minimum possible tax burden.
My Loved Ones helps you document your retirement account information, beneficiary designations, and key contacts so your family has everything they need to manage an inheritance efficiently and wisely.
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