Inheriting a 401(k) usually happens at a difficult time. Someone close to you has died, and alongside the grief comes a set of financial decisions with real tax consequences.
The rules governing inherited retirement accounts changed significantly with the SECURE Act of 2019 and again with SECURE 2.0 in 2022. If you are reading older guidance online, much of it is wrong. The "stretch IRA" strategy that non-spouse beneficiaries once used to spread distributions over a lifetime is largely gone. The rules now depend on three things: your relationship to the person who died, whether they had already started taking required minimum distributions (RMDs), and what category of beneficiary you fall into.
This guide walks through how inherited 401(k) rules work under current law, what options are available to you, and where the tax traps hide.
How inherited 401(k) distributions are taxed
The basic tax rule has not changed. Distributions from an inherited traditional 401(k) are taxed as ordinary income in the year you receive them. The exception is inherited Roth 401(k) funds, where contributions were already taxed on the way in.
How much tax you ultimately pay depends heavily on how and when you take the money out. Taking a large lump sum can push you into a higher bracket for the year. Spreading distributions over several years, where the rules allow it, can reduce the total tax hit.
As long as funds remain in the account, they continue to grow tax-deferred (or tax-free for Roth). The goal is usually to keep money in the account as long as the rules permit while managing the eventual tax bill thoughtfully.
Beneficiary categories matter more than ever
The SECURE Act created a tiered system of beneficiary categories that determines how quickly you must withdraw the money. Understanding which category you fall into is the first and most important step.
Eligible designated beneficiaries
This is the group that still gets the most favorable treatment. Eligible designated beneficiaries can generally take distributions over their own life expectancy rather than being forced into the 10-year window. The categories are:
- Surviving spouse
- Minor child of the account owner (but only until they reach the age of majority, after which the 10-year clock starts)
- Disabled individual (as defined under IRC Section 72(m)(7))
- Chronically ill individual
- A person not more than 10 years younger than the deceased account owner
Designated beneficiaries (most non-spouse individuals)
Adult children, siblings, friends, and other individuals named as beneficiaries who do not qualify as "eligible" fall here. Under the SECURE Act, this group is subject to the 10-year rule: the entire inherited account must be distributed by the end of the 10th calendar year following the year of the account owner's death.
Non-designated beneficiaries
Estates, certain trusts, and charities that do not qualify as designated beneficiaries follow different rules, generally the 5-year rule or distributions based on the decedent's remaining life expectancy, depending on whether the owner died before or after their required beginning date.
The 10-year rule and the annual RMD question
The 10-year rule is the biggest change from prior law for most non-spouse beneficiaries. But within that rule, there is an important nuance that caught even many advisors off guard.
If the account owner died before their required beginning date (generally before age 73 under current law): The beneficiary must empty the account by December 31 of the 10th year after death, but there is no requirement to take distributions in any particular year along the way. You could, for example, wait until year 10 and take everything then, though that would usually be a poor tax strategy.
If the account owner died on or after their required beginning date: The beneficiary must take annual minimum distributions during the 10-year period, calculated using the beneficiary's life expectancy, AND must still empty the remaining balance by the end of year 10.
The IRS waived penalties for missed annual RMDs within the 10-year rule for 2021 through 2024 while it finalized the regulations. Those final regulations were issued in July 2024. Starting in 2025, annual RMDs within the 10-year window are required where applicable, and the penalty for missing them is 25% of the shortfall (reduced to 10% if corrected promptly).
This is one of the most common areas where people make mistakes. If you inherited from someone who was already 73 or older and taking RMDs, you cannot simply wait until year 10 to deal with it.
If you are a surviving spouse
Surviving spouses have the most flexibility of any beneficiary. Here are the main options.
Roll it into your own IRA
Only surviving spouses can roll inherited 401(k) assets into their own traditional IRA and treat it as their own. This is often the strongest option for spouses who do not need the money immediately.
Benefits: You follow your own RMD schedule. If you are younger than 73, no distributions are required yet. The money continues to grow tax-deferred. You get full control over investment decisions. If the old 401(k) plan had limited investment options, an IRA opens up a broader menu.
The tradeoff: If you are under 59 1/2 and withdraw money from an IRA you have treated as your own, the 10% early withdrawal penalty generally applies. That penalty does not apply to distributions from an inherited account.
Roll it into an inherited IRA
A surviving spouse can also move the assets into an inherited IRA, keeping it in the deceased spouse's name for distribution purposes.
Why would you do this instead of treating it as your own? If you are younger than 59 1/2 and may need access to the money, the inherited IRA avoids the 10% early withdrawal penalty. RMDs from the inherited IRA are calculated using the surviving spouse's life expectancy, and distributions can begin in the year following death (or the year the decedent would have reached RMD age, whichever is later).
Elect to be treated as the employee (SECURE 2.0 option)
SECURE 2.0 added a new wrinkle starting in 2024. A surviving spouse who keeps the account in the decedent's name can elect to be treated as if they were the employee for RMD purposes. The practical effect is that RMDs are calculated using the more favorable Uniform Lifetime Table rather than the Single Life Table. This generally produces a smaller required distribution each year.
This election is new and the IRS has issued proposed regulations with additional details. It is worth discussing with your advisor before making the choice, since it interacts with the spouse's own age, the decedent's age at death, and whether the spouse eventually rolls the account into their own name.
Leave the assets in the 401(k) plan
Some spouses choose to leave the money in the original employer plan, at least temporarily. If the plan permits it, this can be simple and may offer certain protections.
However, workplace plans vary widely. Some require beneficiaries to take a lump-sum distribution or empty the account within 5 years. Others offer more flexibility. You are also limited to whatever investment menu the plan provides.
If the deceased spouse was under RMD age (currently 73), the surviving spouse is not required to begin distributions from the plan immediately. If the deceased had already reached RMD age, the surviving spouse must continue taking at least the required minimum.
Take a lump-sum distribution
You can always take all the money at once. The advantage is simplicity and immediate access. The disadvantage is that the entire pre-tax amount becomes taxable income in a single year, which can push you into a significantly higher bracket.
For a $500,000 inherited 401(k), a lump-sum distribution could easily cost six figures in federal taxes alone, depending on your other income. Most people can do better by spreading the withdrawals out.
When a spouse should consider the inherited IRA path
Consider the case of a 45-year-old surviving spouse with a mortgage and two children. If she rolls the inherited 401(k) into her own traditional IRA, any withdrawal before age 59 1/2 triggers a 10% penalty on top of regular income tax. By using an inherited IRA instead, she can access the funds without that penalty while still letting the balance grow tax-deferred. This is not an uncommon situation. The younger the surviving spouse, the more this option deserves serious consideration.
If you are a non-spouse beneficiary
For most non-spouse beneficiaries who inherited a 401(k) from someone who died after 2019, the rules are straightforward but less generous than they used to be.
The 10-year rule applies to most people
Adult children, grandchildren, siblings, friends, and other named beneficiaries must withdraw the entire inherited balance by December 31 of the 10th year after the account owner's death. As discussed above, whether annual distributions are required during those 10 years depends on whether the original owner had reached their required beginning date.
The old "stretch IRA" approach, where a 30-year-old beneficiary could spread distributions over 50+ years, is no longer available for most non-spouse beneficiaries.
Transfer to an inherited IRA
Non-spouse beneficiaries can transfer the 401(k) assets into an inherited IRA via a direct trustee-to-trustee transfer. This is usually the right first step because it gives you more control over investment choices and distribution timing within the 10-year window.
The transfer must go directly from the plan to the inherited IRA custodian. If the money is paid to you first and you try to deposit it later, the plan will generally withhold 20% for taxes, and you may face a complicated scramble to complete the rollover within 60 days.
Tax planning within the 10-year window
Even though the stretch is gone, there is still meaningful planning to do within the 10-year period. The goal is to distribute the money in a way that manages your total tax picture across all 10 years rather than creating one large taxable event.
For example, if you inherit $400,000 in a traditional 401(k), taking roughly $40,000 per year for 10 years might keep you in a lower bracket than taking nothing for 9 years and then withdrawing the full balance in year 10. The right answer depends on your income trajectory, other deductions, and state tax situation.
This is where working with an advisor or tax professional pays for itself. The difference between a thoughtful distribution strategy and a careless one can be tens of thousands of dollars.
Exceptions: eligible designated beneficiaries
If you are disabled, chronically ill, or not more than 10 years younger than the deceased, you may qualify as an eligible designated beneficiary and can use the life-expectancy method instead of the 10-year rule. Minor children of the account owner also qualify, but the 10-year clock begins once they reach the age of majority (generally 21 in most states).
Documentation requirements apply. The IRS final regulations specify that disability or chronic illness must be documented and, in some cases, furnished to the plan administrator.
Disclaiming an inherited 401(k)
You can decline all or part of an inherited 401(k). This is called a qualified disclaimer, and it causes the disclaimed assets to pass to the next beneficiary in line as if you had never been named.
Why would someone do this? Common reasons include wanting to redirect the money to a lower-income family member who would pay less tax, avoiding complications with means-tested benefits like student aid, or simply not wanting the tax liability.
A qualified disclaimer must meet specific requirements under IRC Section 2518:
- The refusal must be irrevocable and unconditional.
- It must be in writing.
- It must be delivered to the plan custodian within nine months of the account owner's death (or nine months after the beneficiary reaches age 21, if they are a minor).
- You must not have accepted any of the inherited assets before disclaiming.
- The assets must pass to the successor beneficiary without any direction from you.
One nuance worth noting: IRS guidance has generally indicated that accepting the required distribution for the year of death may not by itself prevent a qualified disclaimer of the remaining balance. However, this is a technical area where the interaction between IRC Section 2518 and plan rules can be complicated. Work with an estate attorney if you are considering this path.
Common mistakes to avoid
Assuming the old stretch rules still apply. If you inherited a 401(k) from someone who died after 2019, the lifetime stretch is almost certainly gone unless you are an eligible designated beneficiary. Planning around the 10-year rule is now the default.
Ignoring annual RMDs within the 10-year window. If the original owner had reached their required beginning date (currently age 73), you must take annual distributions even though you also have to empty the account within 10 years. Missing these creates a 25% penalty.
Taking a check instead of a direct transfer. Non-spouse beneficiaries who receive a distribution check rather than a direct trustee-to-trustee transfer face mandatory 20% withholding and a 60-day scramble to complete the rollover. Use a direct transfer.
Waiting until year 10 to distribute everything. Even when annual RMDs are not required, bunching the entire distribution in a single year is usually the worst tax outcome. A planned distribution schedule across the 10-year window almost always results in lower total taxes.
Mixing inherited funds with your own. Inherited IRA assets must stay in a properly titled inherited account. If a non-spouse beneficiary deposits the funds into their own IRA, the entire amount may be treated as a taxable distribution.
Get help with your inherited 401(k) decisions
The rules around inherited retirement accounts are more complex than they have ever been. The SECURE Act, SECURE 2.0, and the IRS final regulations created a layered system where the right move depends on your specific circumstances: your relationship to the deceased, their age at death, your age, your income, and your broader financial plan.
Getting this decision wrong can cost tens of thousands of dollars in avoidable taxes. Getting it right means preserving more of what someone important left behind.
If you have inherited a 401(k) and want the decision reviewed in context, that is exactly the kind of work we do. Start a conversation or read more about our retirement and distribution planning approach.
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