Retirement accounts
What Happens to Your 401(k) When You Die: The 10-Year Clock on Inherited Accounts
Your 401(k) passes by beneficiary form, not by will. Most non-spouse heirs must empty the account within 10 years. Here is how the clock actually works.
Your 401(k) goes to whoever is named on the beneficiary form your plan has on file. Not to whoever your will names. That is the single most important thing to understand about what happens to a 401(k) when you die, and it is the reason a form you filled out in eleven seconds during onboarding can outrank a will your attorney spent two hours drafting.
Then a second clock starts. Most people who inherit a 401(k) from someone who is not their spouse have to empty the entire account within ten years. That compresses a lifetime of taxable withdrawals into a single decade, often the decade when the heir is at peak earnings.
Two mechanisms, one form and one clock. They explain almost everything about how retirement money moves at death.
The beneficiary form beats the will
A 401(k) is a plan asset governed by federal law, not a probate asset governed by your state's inheritance rules. Federal law tells the person running the plan to follow the plan's own paperwork. The fiduciary standard requires acting "in accordance with the documents and instruments governing the plan," and your beneficiary designation is one of those documents.
So the plan administrator does not read your will. They do not read your trust. They pull the designation form, find a name, and pay that name.
Why this fails so often, and so expensively
The form is filled out once, at hire, when you are twenty-six and the account has $0 in it. Life then rearranges itself. You marry, divorce, remarry, have children. The account grows to $800,000. The form never changes.
A divorce decree that says your ex has no claim to your retirement assets does not, by itself, rewrite the plan's records. The plan pays the name on the form. Cleaning that up requires either a new designation form or a qualified domestic relations order routed through the plan, not a clause buried in a settlement agreement.
Your spouse is the default, and overriding it takes their signature
If you are married, federal law is heavily tilted toward your surviving spouse. A defined contribution plan generally satisfies the survivor rules by providing that the participant's nonforfeitable account balance "is payable in full, on the death of the participant, to the participant's surviving spouse." That is the baseline the plan starts from.
You can name someone else. But the waiver only works if your spouse consents in writing, the consent acknowledges the effect of the election, it designates the specific beneficiary, and it is "witnessed by a plan representative or a notary public." A signature on a kitchen table with no notary and no plan witness is not a waiver.
Note the word nonforfeitable. What passes to your beneficiary is your own deferrals plus the vested share of the employer money, which is why understanding what vested means in a 401(k) matters at death and not just at resignation. An unvested match is generally not part of the estate.
IRAs work differently. They are not subject to the same federal spousal consent regime, which is one reason a rollover from a 401(k) to an IRA can quietly strip a protection the participant did not know they had.
The order of authority is short enough to draw.
The 10-year rule, and what it actually costs
For deaths after 2019, the SECURE Act replaced the old "stretch" approach with a deadline. A designated beneficiary who is not in one of the protected categories must withdraw the entire balance by December 31 of the year containing the tenth anniversary of the owner's death.
Before 2020, a 40-year-old inheriting a parent's 401(k) could spread withdrawals across a life expectancy of more than forty years. Small annual amounts, low marginal brackets, decades of continued tax deferral. That is gone for most heirs.
The tax bill did not shrink, it got concentrated
This is the mechanism worth sitting with. The 10-year rule does not change how much of the account is taxable. Every dollar coming out of a pre-tax 401(k) is ordinary income to the person receiving it, exactly as it would have been to the original owner.
What changed is the window. Take a $600,000 pre-tax balance. Spread over forty years, that is $15,000 a year of extra income, which for many heirs stacks on top of their salary without pushing them into a new bracket. Compressed into ten years, it is $60,000 a year. For someone already earning $150,000, that additional income lands in higher brackets, and it can also interact with phaseouts and surtaxes that key off adjusted gross income.
The account is the same size. The after-tax value of the inheritance is not.
Timing inside the window is the only lever left
Because there is no required pattern in most cases, the beneficiary controls the shape of the withdrawals. Some spread them evenly. Some front-load into a low-income year, such as a sabbatical or the year of a job change. Some defer everything to year ten and take one enormous distribution, which is the shape most likely to waste bracket space.
Here are the two extremes on the same $600,000 balance. The chart lets the account keep compounding at 6% while it is being emptied, which is why the even path runs above a flat $600,000 divided by ten.
None of those is the right answer in the abstract. The point is that the ten-year window is a planning surface, and ignoring it is itself a choice.
Who escapes the clock: eligible designated beneficiaries
Congress carved out five categories, collectively called eligible designated beneficiaries. If you fall into one, you can generally take distributions over your own life expectancy instead of racing a ten-year deadline.
| Who inherits | What applies | The practical consequence |
|---|---|---|
| The surviving spouse | Life expectancy payments, plus options no one else gets | The broadest exception by far, with its own menu covered in the next section |
| A minor child of the account owner | Life expectancy until the age of majority, then the ten-year clock starts | The account has to be emptied by roughly age 31. Only the owner's own child qualifies, not a grandchild and not a niece |
| A disabled individual | Life expectancy over the beneficiary's own lifetime | Judged against the Social Security disability standard, not a plan's own definition |
| A chronically ill individual | Life expectancy over the beneficiary's own lifetime | Generally someone unable to perform activities of daily living without substantial assistance |
| Anyone not more than ten years younger than the owner | Life expectancy over the beneficiary's own lifetime | The sibling-and-partner category. A brother two years younger, an unmarried partner of similar age, a close friend. The age gap decides it, not the relationship |
| Everyone else named on the form | The ten-year rule | The entire balance out by December 31 of the year holding the tenth anniversary of the death |
Disability and chronic illness are not self-certified. Documentation has to reach the plan administrator by October 31 of the year following the owner's death. Miss that and the beneficiary falls back into the ten-year regime.
If you are the surviving spouse, you have three doors
A spouse who inherits a 401(k) has more choices than anyone else, and the choice is not reversible in every direction. The three doors:
Treat it as your own. A surviving spouse who is the sole beneficiary "may elect to be treated as the owner and not as the beneficiary." The account stops being an inherited account and becomes yours, with your own required distribution timeline based on your age.
Roll it into your own IRA. Mechanically similar to the first door and the more common route, since it consolidates the money with your existing retirement assets and widens the investment menu. The rolled balance is treated as if you had always owned it.
Stay a beneficiary. You leave the account titled as an inherited account. This is the door people forget, and it exists for one specific reason: money in an inherited account is not subject to the 10% early distribution penalty regardless of your age. A 48-year-old widow who needs access to the money keeps that access by remaining a beneficiary. Roll it into her own IRA and she has handed the penalty exception away until 59½. Very few arrangements drop that tax as a property of the account rather than of the reason for the withdrawal; a governmental 457(b) after separation from service is the other familiar one.
A surviving spouse who stays a beneficiary can also wait. Distributions can be deferred until the year the deceased spouse would have reached the applicable age for required distributions, currently 73. If your spouse died at 58, that is fifteen years of continued deferral with no distributions required. Under SECURE 2.0 the spouse may also elect to be treated as the employee for these purposes, which uses a more favorable distribution table once payments begin.
The trade-off is symmetrical. Own it, and you get the friendlier long-run tax treatment but lose penalty-free access before 59½. Stay a beneficiary, and you keep access but give up some flexibility.
The annual RMD wrinkle inside the ten years
Here is where most explanations go wrong. "Ten years, no annual withdrawals required" is only half true.
It depends on whether the owner had already reached their required beginning date, the point at which they were obliged to start taking distributions. If the owner died before that date, the final rules confirm that no distribution is required in any year before the tenth. Pure deadline, no interim schedule.
If the owner died on or after that date, the account was already in payout mode and federal law says it must keep paying "at least as rapidly." Treasury considered eliminating this and declined, concluding the statute requires annual distributions to continue "while also requiring full distribution of the employee's interest in the plan by the end of the calendar year that includes the tenth anniversary of the date of the employee's death."
So a beneficiary in that situation faces both obligations at once: a required amount every year, and a hard sweep in year ten. These final regulations apply for calendar years beginning on or after January 1, 2025.
Missing a required amount carries a real penalty. The excise tax is 25% of the shortfall, reduced to 10% if the beneficiary takes the corrective distribution and files during the correction window, which generally runs to the end of the second taxable year after the year of the miss.
Inherited Roth 401(k)s: same clock, different tax
A designated Roth account inside a 401(k) is subject to the ten-year rule too, and so is an inherited Roth IRA, which carries the same Roth tax deal in a different container. The beneficiary still has to empty it.
The difference is what the withdrawals cost. A qualified distribution from a designated Roth account is not included in gross income, and death is one of the qualifying triggers, provided the five-taxable-year participation period has been satisfied. That five-year period runs from the first day of the taxable year the owner first made Roth contributions to the plan, and it does not restart for the beneficiary.
There is a second advantage, and it comes from the timing rule rather than the tax rule. The IRS states that withdrawals from designated Roth accounts in a 401(k) or 403(b) "are not required until after the death of the account owner." With no lifetime distribution schedule to inherit, a Roth-only owner leaves no annual-RMD wrinkle behind. Ten-year deadline, no interim schedule, and generally no tax when the money comes out.
When nobody is named
If the form is blank and the plan's default provisions do not produce a living individual, or the account passes to an estate or a trust that does not qualify as a see-through, there is no designated beneficiary at all. That is a worse outcome than the ten-year rule.
Death before the required beginning date puts the account under a five-year rule. Half the window, same tax.
Death on or after that date means the remaining interest must be distributed "at least as rapidly as under the distribution method used by the employee as of the date of the employee's death," which is measured against the deceased's own remaining life expectancy. For an 80-year-old that is a short and unforgiving schedule.
Non-spouse beneficiaries also cannot simply move the money into their own IRA. The vehicle has to be an inherited account, "set up and maintained in the name of the deceased IRA owner for the benefit of you as beneficiary," and it has to arrive by direct trustee-to-trustee transfer. A check made out to the beneficiary is a taxable distribution of the whole balance, and there is no undo.
The mechanism in one line
A 401(k) is a contract with a plan, not a possession in an estate. Contracts are performed according to their own documents, which is why the beneficiary form governs and the will does not. Everything downstream follows from that: the spousal consent requirement exists because the contract needs a way to protect a spouse, and the ten-year rule exists because Congress decided the tax deferral inside that contract should not outlive the person who earned it by more than a decade.
Note how differently a traditional pension behaves here. It typically pays a survivor annuity to a spouse and nothing at all to adult children, which is one of the sharper contrasts in the pension versus 401(k) comparison. A 401(k) transfers a balance. A pension transfers a promise, and usually only to one person.
Which means the whole outcome turns on a single line in a plan record, and that line is visible to the account holder at any time.