Do not cash out. If you are a spouse, your first decision is whether to treat the account as your own, elect special spouse treatment if available, or use an inherited IRA. If you are a non-spouse, arrange a direct trustee-to-trustee rollover to an inherited IRA, then plan withdrawals over time. Most non-spouse beneficiaries must empty the account by the end of year 10. If the decedent died on or after their required beginning date, annual RMDs can apply in years 1 to 9 under current IRS guidance. For Roth 401(k) inheritances, qualified distributions are generally tax-free and there are usually no annual RMDs within the 10-year window, but the account still must be emptied by year 10 unless you are an eligible designated beneficiary. Use staging, bracket management and treaty claims where relevant to reduce the tax drag.
What you will learn
- Baseline tax treatment for inherited Traditional vs Roth 401(k)s
- Spousal and non-spousal pathways and when each is best
- How the 10-year and life-expectancy rules really work
- Penalties, withholding and practical traps
- Expat tactics for UK-resident beneficiaries
1) General tax treatment
Traditional 401(k). Contributions were pre-tax, so distributions are taxed to you as ordinary income when withdrawn.
Roth 401(k). Funded with after-tax dollars. If the five-year clock has been satisfied (counted from the original owner’s first designated Roth contribution), qualified beneficiary withdrawals are generally income-tax-free. Beneficiaries must still follow inherited-account distribution timing rules.
Roth RMDs. From 2024, owners of Roth accounts in employer plans have no lifetime RMDs. That change does not remove beneficiary distribution deadlines. Always check the plan’s rules and current IRS guidance before acting.
2) Spousal beneficiaries: your menu of options
Choose with your time horizon and cash-flow needs in mind.
A) Treat the account as your own (spousal rollover).
Roll to your own IRA or, if allowed, to your workplace plan.
- Pros: defers RMDs until your RMD age (73 under current law, scheduled to rise to 75 for later cohorts), preserves tax deferral, lets you keep contributing to your own plan.
- Cons: if you need money before 59½, withdrawals may face the 10% early-distribution penalty because it is now your account.
B) Stay as a beneficiary in an inherited IRA.
- Pros: no 10% early-withdrawal penalty at any age; you can use life-expectancy RMDs if you qualify as an eligible designated beneficiary (EDB), or a plan-permitted 10-year framework.
- Cons: you generally cannot contribute; beneficiary RMD timing applies.
C) Leave funds in the 401(k) (if the plan allows).
Can retain low-cost institutional funds or stable-value options, but you are bound by plan terms.
D) Lump sum.
Generally a last resort, as the entire taxable amount hits your income in one year.
RMD timing for spouses with Traditional funds.
Rules depend on whether the decedent died before or after their required beginning date (RBD, usually age 73 today). Spouses often may delay until the year the decedent would have turned RMD age or use life-expectancy payments. Check plan terms and current IRS guidance when you act.
3) Non-spouse beneficiaries: practical pathways
A) Direct rollover to an inherited IRA.
Must be trustee-to-trustee. This keeps tax deferral and gives you control within the rules.
B) Leave it in the plan (if permitted).
Simple, but you are bound by the plan’s investment menu and distribution features.
C) Lump sum.
Simple, but often tax-inefficient.
Distribution rules that trip people up.
- Most non-spouse beneficiaries of decedents who died after 2019 must empty the account by 31 December of year 10 after death.
- If the decedent died on or after their RBD, annual RMDs may also be required in years 1 to 9 under the current framework. The IRS provided temporary relief in recent years while final regulations were pending. Do not assume future waivers.
- Missed RMDs can trigger an excise tax on the shortfall. SECURE 2.0 reduced the penalty to 25%, falling to 10% if corrected in time.
Eligible designated beneficiaries (EDBs) who can use life-expectancy payouts instead of the 10-year rule include:
- The decedent’s minor child (switches to a 10-year clock at age 21)
- A disabled or chronically ill individual
- A beneficiary less than 10 years younger than the decedent
4) Minor children of the decedent
Minor children who are EDBs can take life-expectancy RMDs until age 21. At 21, the 10-year clock starts, and the account must be empty by 31 December of the tenth year after turning 21.
5) Penalties and withholding: avoid these gotchas
- 10% early-withdrawal penalty. Does not apply to beneficiary distributions from inherited accounts. Exception: a spouse who rolls into their own IRA and then withdraws before 59½ can face the penalty.
- Withholding and checks. Use direct trustee-to-trustee movement to an inherited IRA wherever possible. If funds are paid to you, federal withholding can apply and the distribution becomes taxable immediately. Non-spouse beneficiaries cannot fix this after the fact. For non-US persons, default withholding can be 30% unless reduced by treaty with a W-8BEN on file.
6) Practical ways to minimise tax legally
- Use an inherited IRA.
A direct trustee-to-trustee rollover preserves tax deferral and your control within the 10-year or life-expectancy framework. - Stage withdrawals across years.
Spread income to avoid bracket creep and means-tested surcharges, and to coordinate with your own earnings. Avoid leaving the entire balance to year 10. - Follow the RBD rules carefully.
If annual RMDs apply in years 1 to 9, take them. Confirm the current-year position before you set your cadence. - Coordinate spousal choices with age and access.
If you are under 59½ and need funds, consider staying as beneficiary to avoid the 10% penalty rather than treating the account as your own immediately. If you are 60+ and do not need access, treating as your own may defer RMDs longer. - Lifetime planning by the original owner.
Partial Roth conversions during life can shift future beneficiary withdrawals toward tax-free, subject to the five-year clock. Owners of Roth 401(k)s have no lifetime RMDs from 2024, improving autonomy later in life. - Expat specifics for UK-resident beneficiaries.
- As a UK resident inheriting a US 401(k), you may face default US withholding unless you submit a W-8BEN claiming the US-UK treaty. Under Article 17, most private pension distributions are taxable only in the state of residence, so you can often reduce US withholding to 0% at source and pay tax in the UK instead. Keep treaty evidence with your custodian.
- Confirm your UK position with your accountant. The UK taxes 401(k) distributions as income. Claim foreign tax credits if any US withholding was not fully eliminated.
- Choose an IRA custodian that services non-US addresses to avoid account freezes or forced distributions.
FAQs
Do beneficiaries of Roth 401(k)s have annual RMDs in years 1 to 9?
Generally no for non-EDBs, but the account still must be emptied by year 10. Owners of Roth accounts in employer plans have no lifetime RMDs from 2024.
What is the current RMD age and will it increase again?
The RMD age is 73 today and is scheduled to rise to 75 in 2033 for some cohorts.
What if I missed a beneficiary RMD because the rules kept changing?
The IRS provided temporary relief in recent years while final regulations were pending. Do not assume future relief—correct promptly and document why you relied on the relief notices.
I am UK-resident. Can I stop US withholding on my inherited 401(k)?
Often yes. Provide a W-8BEN that claims Article 17 of the US-UK treaty so the payer can apply a 0% rate at source, then report the income in the UK. Keep proof on file.
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How Josh Clancey can help
- Spouse vs non-spouse pathway. We map your options side by side and quantify the trade-offs of treating as your own vs using an inherited IRA vs plan-based options.
- 10-year vs life-expectancy modelling. We build a year-by-year withdrawal plan that fits your other income, smoothing brackets and avoiding bunching in year 10.
- Roth and conversion planning. For families planning ahead, we test lifetime Roth conversion ranges to improve beneficiaries’ outcomes.
- Expat execution. We prepare the treaty claim wording for your W-8BEN, liaise with the custodian, and coordinate UK reporting so you pay tax once in the right place.
- Compliance guardrails. We track RMD cadences, monitor IRS updates and ensure documentation supports every move.
Book a no-cost inherited 401(k) strategy call to get a tailored, compliant plan.
About Josh Clancey
Josh Clancey is a financial planner for UK expatriates and returners. He writes in-depth, policy-led guidance and advises on cross-border pensions, retirement income and protection. His focus is simple: pay the right tax in the right place, avoid penalties and keep more of your wealth working for your family.
