US Expat Tax Services IRA and 401k Reporting in the UK |

US Expat Tax Services: IRA and 401k Reporting in the UK

US Expat Tax Services for IRA and 401 (k) Accounts in the UK

US expat tax services for Americans living in the United Kingdom must address US retirement accounts — including traditional IRAs, Roth IRAs, 401(k)s, and former employer retirement plans — as a distinct category of cross-border tax planning. The treatment of these accounts under UK tax law differs significantly from their US treatment. The US-UK treaty provides specific protection for the growth within them, and the required minimum distribution rules create an annual US income that must be reported in both countries. Furthermore, many Americans in the UK who hold US retirement accounts have never given specific thought to how those accounts are treated under UK tax law — assuming that since the accounts are entirely US-based, UK tax simply does not apply. Additionally, the UK treatment of distributions from a traditional IRA depends on whether the payments qualify as pension income under Article 17 of the US-UK treaty, which in turn determines whether UK income tax applies to the same distribution in the year it is received. Consequently, US expat tax services for any UK-resident American with significant US retirement account balances must include a specific assessment of the UK and US treatment of those accounts — covering the annual growth, the distribution rules, the required minimum distributions, and the FBAR reporting position.

How the US-UK Treaty Treats US Retirement Accounts

Article 17 and US Pension Accounts

Article 17(1) of the US-UK treaty provides that pension income paid by one country to a resident of the other is taxable only in the country of residence. Furthermore, where a UK-resident American receives a distribution from a traditional IRA or 401(k) — both of which are pension-type arrangements — the distribution is taxable only in the United Kingdom as the country of residence. Additionally, this treaty allocation means IRA and 401(k) distributions received by a UK-resident American are excluded from the US return under Article 17(1) — disclosing the treaty position on Form 8833 — and reported instead on the UK self-assessment as pension income. Consequently, the same distribution that the US would otherwise tax as ordinary income is taxable only in the UK under the treaty, eliminating the US income tax on IRA and 401(k) distributions for UK-resident Americans and subjecting those distributions to UK income tax instead. The full US-UK treaty text is at https://www.gov.uk/government/publications/usa-tax-treaties.

Whether IRA Distributions Are Truly Pension Income

The treaty allocation of IRA and 401(k) distributions to UK-only taxation applies where those distributions qualify as "pensions and other similar remuneration paid in consideration of past employment." Furthermore, traditional IRAs funded by deductible contributions — where the contributions were made from employment income and reduced the taxable income in the year of contribution — generally qualify as pension income for treaty purposes. Additionally, 401(k) and similar employer-sponsored plans clearly qualify as pension income under Article 17. Consequently, for most UK-resident Americans with traditional IRAs and former employer 401(k) plans, Article 17(1) applies — distributions are taxable only in the UK, excluded from the US return via Form 8833, and reported on the UK self-assessment. The IRS treaty guidance is at https://www.irs.gov/businesses/international-taxpayers/us-citizens-and-resident-aliens-abroad.

The Savings Clause Exception for Article 17

Article 17 is specifically listed as an exception to the savings clause in Article 1(6) of the treaty — meaning it applies to US citizens and genuinely changes their US tax position. Furthermore, this is a critically important exception — most treaty articles do not reduce US tax on US citizens because of the savings clause, but Article 17 specifically does. Additionally, where Article 17 applies, and the distribution is taxable only in the UK, the US citizen excludes the distribution from the US return — saving the US income tax at the applicable marginal rate on the full distribution amount. Consequently, US expat tax services must confirm that the Article 17 exception to the savings clause applies for each type of US retirement account distribution — and file Form 8833 each year that the treaty-based exclusion is claimed on the US return.

UK Income Tax on US Retirement Account Distributions

How HMRC Treats IRA Distributions

HMRC treats distributions from a US traditional IRA as pension income — taxable in the UK under normal UK income tax rules in the year of receipt. Furthermore, the distribution amount in US dollars is converted to sterling at the exchange rate on the date of receipt — or at the average rate for the year — and included in the UK-taxable income for the UK tax year in which it is received. Additionally, the UK personal allowance of £12,570 is available to offset the IRA distribution alongside other UK income, meaning a small IRA distribution may fall entirely within the personal allowance and attract no UK income tax. Consequently, the UK income tax on IRA distributions is calculated on the same sterling amount as would be taxable on any other pension income — making the effective UK tax rate on the distribution a function of the UK-resident American's total income for the year, including UK employment income, UK pension income, and any other UK-taxable amounts. The HMRC foreign pension guidance is at https://www.gov.uk/tax-foreign-income/overview.

Required Minimum Distributions and UK Tax

The IRS requires US citizens with traditional IRAs and 401(k)s to take required minimum distributions beginning at age 73 — calculated annually based on the account balance and the applicable life expectancy factor. Furthermore, the RMD for each year is included in US gross income — but for UK-resident Americans, the Article 17 treaty exclusion applies to the RMD in the same way as any other IRA distribution. Additionally, the RMD converted to sterling is reported on the UK self-assessment in the year of receipt, with UK income tax applying at the applicable marginal rate. Consequently, US expat tax services must model the UK income tax on the anticipated annual RMD for each client approaching age 73, since the RMD may be a significant annual income addition that, combined with UK employment or pension income, pushes the taxpayer into the 40% UK rate. The IRS RMD guidance is at https://www.irs.gov/retirement-plans/retirement-plans-faqs-regarding-required-minimum-distributions.

Roth IRA: The Different Treatment

How Roth IRA Distributions Are Treated Under the Treaty

Roth IRA distributions are treated differently from traditional IRA distributions — both under US domestic law and under the US-UK treaty. Furthermore, qualifying Roth IRA distributions are US tax-free under US domestic law — having been funded from after-tax contributions, the growth and qualifying distributions are permanently US income-tax-free. Additionally, the UK treatment of Roth IRA distributions is less clear than the traditional IRA treatment — since the Roth IRA is not funded from pre-tax employment income in the same way, its status as "pension income in consideration of past employment" under Article 17 is arguably weaker. Consequently, US expat tax services advise on a case-by-case basis whether a Roth IRA distribution received by a UK-resident American is treated as UK pension income — and where the UK treatment is uncertain, obtain a specific HMRC technical opinion before including or excluding the distribution from the UK self-assessment. The IRS Roth IRA guidance is at https://www.irs.gov/retirement-plans/roth-iras.

Annual Growth Within the Roth IRA

The annual growth within a Roth IRA — dividends, interest, and capital gains — is US income-tax-free under US domestic law. Furthermore, the US-UK treaty provides that income accruing within a pension arrangement is not taxable in either country until it is distributed — meaning the annual growth within a Roth IRA is also not subject to UK income tax in the year it arises. Additionally, this treaty protection means a UK-resident American with a Roth IRA accumulating significant annual investment returns pays no UK income tax on those returns each year — a significant advantage compared with holding the same investments outside the Roth wrapper. Consequently, the Roth IRA is one of the most tax-efficient savings vehicles available to UK-resident Americans — growth accumulates free of both UK and US annual income tax, and qualifying distributions are US tax-free. The US expat tax services position for Roth IRA accounts is confirmed with each client at the start of the UK residence period.

FBAR Reporting for US Retirement Accounts

Are US IRAs and 401 (k) FBAR-Reportable?

US IRAs, Roth IRAs, and 401(k) accounts held at US financial institutions are not foreign financial accounts — they are US accounts at US institutions. Furthermore, the FBAR applies only to foreign financial accounts — accounts maintained at a foreign financial institution — and US retirement accounts held at Fidelity, Vanguard, Charles Schwab, or similar US providers are definitively not foreign accounts. Additionally, there is no FBAR obligation for a US citizen's US retirement accounts regardless of where the US citizen lives — the US-based IRA or 401(k) is outside the FBAR scope by definition. Consequently, UK-resident Americans do not need to include their US IRAs or 401(k)s on the FBAR — a relief from the reporting complexity that applies to their UK pension and investment accounts. US expat tax services confirm this position for each client at the outset of any engagement involving US retirement accounts, since many clients incorrectly assume their US accounts require FBAR reporting. The FinCEN FBAR guidance is at https://www.fincen.gov/financial-crimes-enforcement-network/fbar.

Form 8938 and US Retirement Accounts

US IRA and 401(k) accounts are also excluded from Form 8938 reporting — they are not specified foreign financial assets. Furthermore, Form 8938 applies only to foreign financial accounts and non-US financial interests — and a US retirement account held at a US financial institution is neither. Additionally, the Form 8938 exclusion for US retirement accounts applies regardless of the account value — even a $2 million US IRA is not reportable on Form 8938. Consequently, a UK-resident American with both a US IRA and UK pensions needs Form 8938 only for the UK pensions and investment accounts that meet the threshold — not for the US retirement accounts, regardless of their value. The IRS Form 8938 guidance is at https://www.irs.gov/forms-pubs/about-form-8938.

Rollovers and Transfers While Living in the UK

Rolling a 401k Into an IRA While a UK Resident

Where a UK-resident American leaves a US employer and wishes to roll over their 401(k) to an IRA, the rollover itself is not a taxable event under US domestic law — the funds move from one qualified plan to another without triggering income tax. Furthermore, the rollover is also not a UK taxable event — it is a transfer between pension arrangements, not a distribution, and does not create UK income tax in the year of the transfer. Additionally, the IRA that receives the rollover continues to benefit from the same Article 17 treaty treatment as any other traditional IRA — distributions are taxable only in the UK under Article 17(1). Consequently, the 401(k) to IRA rollover while UK-resident is a tax-neutral event in both countries — US expat tax services simply confirm the rollover mechanics and the continued treaty treatment of the IRA going forward. The IRS rollover guidance is at https://www.irs.gov/retirement-plans/plan-participant-employee/rollovers-of-retirement-plan-and-ira-distributions.

Case Study: UK-Resident American With Traditional IRA and Roth IRA

Our team provides US expat tax services for a US citizen who has lived in London for six years, holds a traditional IRA worth approximately $280,000 at a US broker, a Roth IRA worth approximately $95,000 at the same broker, and receives required minimum distributions from the traditional IRA of approximately $12,800 per year since reaching age 73.

The annual filing position for this client is as follows. The $12,800 RMD from the traditional IRA is excluded from the US return under Article 17(1) — Form 8833 is attached to the Form 1040 confirming the treaty-based exclusion. Furthermore, the RMD is converted to sterling at the rate on the date of receipt — approximately £10,100 at a rate of 1.27 — and reported on the UK self-assessment as pension income. UK income tax at 20% on the amount above the personal allowance applies — approximately £1,200 of UK income tax on the RMD. Additionally, the annual growth within both the traditional IRA and the Roth IRA — dividends, interest, and capital gains — is not taxed in either country in the year it arises, under the treaty protection for pension arrangement growth. The US IRA and Roth IRA accounts are not included in the FBAR and are not included in Form 8938. Consequently, the combined annual tax on the $12,800 RMD is approximately £1,200 of UK income tax — and zero US income tax. The Roth IRA distributions, when eventually taken, are expected to be US income-tax-free and subject to UK tax confirmation at that time.

Common Mistakes in US Retirement Accounts

Not Claiming the Article 17 Exclusion

The most financially significant error for UK-resident Americans receiving IRA distributions is not claiming the Article 17 exclusion — including the distribution in US gross income and paying US income tax on it, when the treaty means it should be taxable only in the UK. Furthermore, missing the Article 17 exclusion produces double taxation on the same distribution — UK income tax in the UK and US income tax in the US on the same amount. The correct approach requires US expat tax services to attach Form 8833 to the US return each year IRA or 401(k) distributions are received — identifying Article 17(1) as the applicable treaty provision and the excluded amount. IRS Form 8833 guidance is at https://www.irs.gov/forms-pubs/about-form-8833.

Not Reporting the Distribution on the UK Self-Assessment

Where the Article 17 exclusion removes the distribution from the US return, many UK-resident Americans assume the distribution is globally tax-free, and do not report it on the UK self-assessment. Furthermore, the treaty allocates the distribution to UK taxation — it is not tax-free globally, it is simply taxable only in the UK. The correct approach requires reporting the sterling equivalent of the IRA distribution on the UK self-assessment in the year of receipt — with UK income tax applying at the marginal rate above the personal allowance.

Including US IRA Accounts in the FBAR

Some US preparers include US IRA accounts on the FBAR — incorrectly treating them as foreign financial accounts because the owner lives abroad. Furthermore, a US IRA held at a US financial institution is a US account — not a foreign financial account — and is not FBAR-reportable regardless of the owner's residence. The correct approach requires US expat tax services to confirm that every FBAR-reportable account is a foreign financial account at a foreign financial institution — excluding all US-based IRAs, 401(k)s, and brokerage accounts from the FBAR calculation.

How US-UK Tax Can Help

At US-UK Tax, our team of Enrolled Agents, Chartered Tax Advisers, and Certified Public Accountants provides specialist US expat tax services for UK-resident Americans with US retirement accounts. Furthermore, we claim the Article 17(1) exclusion on Form 8833 each year IRA or 401(k) distributions are received, report the sterling-equivalent distribution on the UK self-assessment, advise on the RMD planning as the client approaches age 73, confirm the Roth IRA UK treatment, and confirm the FBAR and Form 8938 exclusion for US-based retirement accounts. Additionally, we advise on Roth IRA conversion planning in the pre-UK-arrival window for clients planning a UK move.

Contact our team today. Email hello@us-uktax.com call 0333-8807974, or visit https://www.us-uktax.com/contact/.

Conclusion

US retirement accounts held by UK-resident Americans benefit from significant treaty protection — Article 17(1) allocates traditional IRA and 401(k) distributions to UK-only taxation, eliminating US income tax on those distributions, while the treaty also protects annual growth within both traditional and Roth IRAs from UK annual taxation. Furthermore, specialist US expat tax services that claim the Article 17 exclusion on Form 8833, report the distribution on the UK self-assessment, and confirm the FBAR and Form 8938 exclusion for US-based accounts ensures the retirement income is taxed once in the correct country — not twice. Moreover, required minimum distributions from age 73 require advanced UK income tax modelling — since the RMD may interact with UK employment and pension income to create a meaningful UK tax liability. Contact US-UK Tax at hello@us-uktax.com or call 0333-8807974 today.

Contact Us

US-UK Tax | hello@us-uktax.com | 0333-8807974

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FAQs

Q: Are IRA distributions taxable in the US for UK residents?

A: No, under Article 17(1) of the US-UK treaty. IRA and 401(k) distributions received by a UK-resident American are taxable only in the UK — excluded from the US return with Form 8833 filed each year disclosing the Article 17 treaty position. The same distribution is reported on the UK self-assessment as pension income.

Q: Must I report my US IRA on the FBAR?

A: No. A US IRA held at a US financial institution is a US account — not a foreign financial account. The FBAR applies only to foreign financial accounts at foreign financial institutions. US-based IRAs, Roth IRAs, and 401(k) accounts are excluded from the FBAR regardless of where the account holder lives.

Q: How does the UK tax IRA distributions?

A: As pension income. The sterling equivalent of the IRA distribution — converted at the rate on the date of receipt — is included in the UK-taxable income for the year of receipt. UK income tax at 20%, 40%, or 45% applies above the personal allowance at the taxpayer's marginal rate for that year.

Q: Is Roth IRA growth taxable in the UK?

A: Generally, no. The US-UK treaty protects growth within pension arrangements from taxation in either country until distributed. Annual investment returns within the Roth IRA — dividends, interest, and capital gains — are therefore not subject to UK annual income tax under the treaty protection, matching the US income-tax-free treatment of Roth IRA growth.

Q: What are required minimum distributions, and how are they taxed in the UK?

A: RMDs are mandatory annual withdrawals from traditional IRAs beginning at age 73, calculated from the account balance and life expectancy tables. For UK-resident Americans, RMDs are treated as pension income under Article 17 — excluded from the US return and reported on the UK self-assessment, with UK income tax applying at the marginal rate.

Q: Is a 401 (k) rollover to an IRA taxable in the UK?

A: No. A direct 401(k) to IRA rollover is not a distribution — it is a transfer between pension arrangements and is not a taxable event in either the UK or the US. The IRA continues to benefit from the same Article 17 treaty treatment after the rollover as any other traditional IRA.