Inherited 401(k)s and the 10-Year Rule

You inherited a 401(k). Now you need to know how long you have to empty it, whether you must take money out every year, and how to avoid handing a large portion of it to the IRS unnecessarily. The rules changed significantly in 2020, and the IRS clarified them further in proposed regulations that caught many beneficiaries off guard.

What the SECURE Act Changed

Before the Setting Every Community Up for Retirement Enhancement (SECURE) Act took effect on January 1, 2020, most non-spouse beneficiaries could "stretch" inherited retirement account withdrawals over their own life expectancy. A 40-year-old inheriting a large 401(k) could spread distributions over four decades, keeping annual taxable income modest.

The SECURE Act ended that for most people. If the original account owner died on or after January 1, 2020, and you are not in an "eligible designated beneficiary" category, you have exactly 10 years from the end of the year of death to withdraw every dollar. No exceptions, no extensions.

Eligible designated beneficiaries, who still get the lifetime-stretch treatment, include: the surviving spouse, minor children of the deceased (until they reach the age of majority), disabled or chronically ill individuals, and beneficiaries who are not more than 10 years younger than the deceased. Everyone else, including adult children, siblings, and most trusts, falls under the 10-year rule.

The Annual RMD Requirement Nobody Warned You About

Here is where many beneficiaries get hurt. Most people assumed the 10-year rule meant they could wait until year 10 and take one large distribution. The IRS proposed regulations under Reg 1.401(a)(9)-5 clarified that is not always true.

If the original account owner had already reached their required beginning date (generally April 1 of the year after turning 73 under current law) and was taking required minimum distributions when they died, then you as the non-spouse beneficiary must also take annual RMDs during years 1 through 9, and then fully empty the account by the end of year 10.

If the original owner died before reaching their required beginning date, the beneficiary technically has more flexibility, though the account must still be emptied within 10 years.

The IRS waived penalties for missed annual RMDs in 2021, 2022, 2023, and 2024 while the regulatory picture was being clarified. That waiver period has ended. Going forward, a missed RMD carries a 25 percent excise tax on the amount that should have been withdrawn (reduced to 10 percent if corrected promptly under the SECURE 2.0 correction window). Verify the current status of any guidance with a qualified tax advisor before acting.

The Real Decision: Front-Load or Back-Load Withdrawals

Assuming you have flexibility (the owner died before their required beginning date), you face a genuine planning question. You can take nothing in years 1 through 9 and absorb everything in year 10, or you can spread distributions strategically across the decade. The math usually favors spreading them out, but the right answer depends entirely on your own income trajectory.

Consider two scenarios using the same $400,000 inherited 401(k):

Scenario A: The beneficiary is 45, currently earning $180,000 per year, but plans to leave full-time work at 52. Taking large distributions during high-earning years means stacking that income on top of an already-full bracket. Waiting until lower-income years, even if that means a larger year-10 withdrawal, can save tens of thousands in federal tax.

Scenario B: The beneficiary is 58, still working at peak salary, and expects similar income through retirement at 65. Year 10 falls right in the heart of their highest-earning years. Front-loading distributions into a year where income happens to dip, or spreading evenly to avoid bracket creep, makes more sense than letting the account compound toward one enormous taxable event.

The general principle: find the lowest-tax years within the 10-year window and fill them first, without pushing income high enough to trigger Medicare premium surcharges (IRMAA thresholds) or push capital gains into a higher bracket.

How This Connects to the 401(k) Rollover Pillar

One practical point worth raising: inherited 401(k)s are sometimes eligible to be rolled into an inherited IRA, which can offer more investment flexibility and potentially more control over the withdrawal timing. The rules around that transfer are narrow and plan-dependent, but when it works, it is often worth doing. You can find the broader context on 401(k) transfers, including when a rollover makes sense versus when it doesn't, in our guide 401(k) Rollover: A Complete Guide to Moving an Old Retirement Account.

This decision, structuring the 10-year withdrawal window for the least tax drag, lives squarely in the Harvest stage of the Sporos Doctrine, where the focus shifts from accumulation to sequencing distributions in a tax-aware way.

Frequently Asked Questions

Does the 10-year rule apply to 401(k)s inherited before 2020?

No. If you inherited a 401(k) before January 1, 2020, the old stretch rules apply to you. The SECURE Act's 10-year rule only applies when the original account owner died on or after that date.

Can a spouse who inherits a 401(k) use the 10-year rule or avoid it entirely?

A surviving spouse has more options than other beneficiaries. They can roll the inherited 401(k) into their own IRA or 401(k), treat it as an inherited IRA with life-expectancy distributions, or elect the 10-year rule. Most surviving spouses benefit from rolling into their own account, but the right move depends on age and income.

What happens if I miss the year-10 deadline?

The full remaining balance becomes a taxable distribution, and you would owe ordinary income tax on it regardless. There is no mechanism to extend the deadline. Missing it does not trigger an additional excise tax beyond ordinary income tax on the distribution itself, but the IRS excise tax applies to annual RMDs missed during years 1 through 9 when those are required.

Is the inherited 401(k) subject to state income tax as well?

Generally yes. Most states tax distributions from inherited retirement accounts as ordinary income, though a handful offer partial or full exemptions. Check your state's rules specifically, since they do not always mirror federal treatment.

Can I disclaim an inherited 401(k)?

Yes. You can disclaim (refuse) the inheritance within nine months of the account owner's death, provided you have not already accepted any benefit from the account. A qualified disclaimer passes the account to the next contingent beneficiary. This can be useful if the inheritance would push you into a significantly higher bracket and the next beneficiary is in a lower one.

Does the 10-year rule apply to Roth 401(k)s?

Yes, the 10-year rule applies to inherited Roth 401(k)s just as it does to traditional 401(k)s. The key difference is that qualified distributions from an inherited Roth account are income-tax-free, which removes the bracket-management pressure but does not extend your timeline.

What to Do Next

Confirm whether the original owner died before or after their required beginning date. This determines whether you owe annual RMDs during the 10-year window.
Map out your own expected income for each year within the window so you can identify the lowest-tax years to front-load distributions.
Ask the plan administrator whether the inherited 401(k) can be transferred to an inherited IRA, which may give you broader investment options and more flexibility in timing withdrawals.
Work with a CPA or tax advisor to model the bracket impact of different distribution schedules before year one of the window passes.

The information provided is for educational purposes only and does not constitute investment, legal, or tax advice. Tax law changes frequently — verify current rules before acting. Consult with qualified professionals for guidance specific to your situation.