Roth IRA UK Resident Guide: What HMRC and the IRS Each Expect

Roth IRA UK resident: an introduction

The Roth IRA UK resident position is mostly good news. The treaty stops HMRC taxing the growth while the money stays inside the account. Moreover, a qualified withdrawal that is tax-free in the US should be tax-free in the UK too. The trouble starts with early withdrawals and large single payments. Those can fall outside the shelter, and the answer then depends on how the payment is classed.

This article supports our guide to the US-UK double taxation treaty. It follows one account through its life: the years of growth, any new contributions, and the day you draw from it. At each stage we show what goes on the US return and what goes on the UK return. We prepare and file returns; we do not advise on investments.

Why the Roth IRA UK resident question covers two returns

A Roth IRA is a US individual retirement account funded with income that has already been taxed. In the US, qualified withdrawals then come out tax-free. However, Britain has no Roth equivalent in its own law. Its treatment comes almost entirely from the treaty. Consequently, you need the US rules and the treaty wording side by side before you can fill in either return.

Who this guide is for

We write for US citizens and green card holders who live in the UK and hold a Roth IRA. It also applies to Britons who opened one while working in America and then came home. By contrast, inherited Roth accounts raise extra rules, and we leave them for another day.

Does HMRC tax the growth inside a Roth IRA?

No, not while the money stays in the account. For a Roth IRA UK resident owner, Article 18 of the treaty stops the UK taxing a US pension scheme's income for a UK resident until a distribution is made.

The treaty names Roth IRAs expressly

The treaty only helps arrangements it calls a pension scheme. Treasury's Technical Explanation of the US-UK treaty settles this point. Its list of US pension schemes includes "Roth IRAs under section 408A". Therefore, you do not need to argue that your account counts. It is on the agreed list, which gives every Roth IRA UK resident owner a firm starting point.

What Article 18 paragraph 1 does

The treaty text protects the income of a pension scheme in the other country. According to the Technical Explanation, the residence country does not tax a scheme's earnings until a distribution is made. Furthermore, this paragraph is one of the exceptions to the saving clause. So it works for US citizens living in Britain, not just for Britons.

What you report each year while you wait

In a year with no withdrawal, a Roth IRA UK resident owner puts nothing about it on the UK return. Dividends and gains inside it are not foreign income you declare. On the US side, it needs nothing either. For example, a year of strong growth leaves both returns untouched. Keep the annual statements anyway, because you will need the contribution history later.

Are Roth IRA withdrawals taxed in the UK?

A qualified withdrawal should not be. For a Roth IRA UK resident drawing after 59½, Article 17(1)(b) makes the UK exempt any pension amount the US would exempt for its own residents. However, early withdrawals and large single payments need more care.

Qualified distributions

IRS Publication 590-B defines a qualified distribution. It must come after a five-year period that starts with the first tax year you contributed to any Roth IRA. In addition, you must be 59½ or older, disabled, or a beneficiary after death. A first-home withdrawal also qualifies, up to a $10,000 lifetime limit. The Technical Explanation then gives the UK answer directly. It says a Roth distribution to a UK resident is exempt in Britain to the same extent it would be exempt for a US resident.

Non-qualified withdrawals follow the ordering rules

An early withdrawal is split into slices. Publication 590-B sets the order: regular contributions come out first, then conversions, then earnings. Contributions come back tax-free in the US. Earnings are taxable, and a 10% additional tax generally applies before age 59½. Consequently, under Article 17(1)(b) the contribution slice should also be exempt in the UK. The earnings slice gets no such protection, so HMRC can tax it.

The lump-sum question

Here the position becomes contested. Article 17(2) has a separate rule for lump sums. The Technical Explanation says lump sums are not subject to the general rule in paragraph 1. Arguably, that takes a large Roth payment outside the 17(1)(b) exemption. HMRC's International Manual on pension lump sums says a payment of half the fund or more is generally a lump sum. It adds that a fifth or more often is. Moreover, it says the residence country can still tax a US lump sum under Article 1(4). No published HMRC guidance applies this to a Roth payment specifically. So every Roth IRA UK resident drawing a large sum faces a genuine grey area.

Can you keep contributing to a Roth IRA from the UK?

Yes, a Roth IRA UK resident can keep paying in if they have enough US-taxable compensation and income under the limits. The catch is the foreign earned income exclusion. Wages you exclude under it do not count.

Excluded wages are not compensation

The foreign earned income exclusion is an election that removes overseas wages from US taxable income. Publication 590-A says compensation does not include amounts you exclude, such as foreign earned income. Therefore, if every pound of your UK salary is excluded, you have nothing to base a contribution on. By contrast, wages covered by the foreign tax credit still count. This is one reason we model both methods before choosing.

The 2026 limits

The IRS announced the 2026 IRA contribution limit as $7,500, with a further $1,100 catch-up from age 50. For 2026, the Roth phase-out for single filers runs from $153,000 to $168,000 of modified adjusted gross income. For joint filers it runs from $242,000 to $252,000. Married people filing separately who lived together all year face a $0 to $10,000 range. That last range catches many Americans in Britain with a non-US spouse. Furthermore, Publication 590-A adds any foreign earned income exclusion back when you work out modified income.

Timing and UK relief

You can contribute for a year up to your US return's due date, not counting extensions. On the UK side, a Roth contribution earns no relief. Article 18 does allow relief for some cross-border contributions, but only within its conditions. Those include agreement that the US scheme corresponds to a UK one. Additionally, the money you contribute has normally been taxed by HMRC as salary already.

Do you need Form 8833, an FBAR or Form 8938 for a Roth IRA?

Usually none of them. A Roth held at a US custodian is a US account, and a qualified withdrawal is exempt under US law without any treaty claim.

Form 8833

Form 8833 discloses a treaty-based position taken on a US return. For a Roth, the treaty claim normally sits on the UK return, not the US one. As a result, Form 8833 rarely comes into a Roth IRA UK resident filing. It matters only if your US return relies on a treaty article to change the US result.

FBAR and Form 8938

The FBAR covers foreign financial accounts, and a Roth at an American broker is not foreign. Likewise, the IRS answers on Form 8938 say you need not report an account held at a US financial institution. Your UK accounts are another matter, and both forms may well apply to them.

Withdrawals and conversions on the US return

A non-qualified withdrawal goes on Form 8606, Part III, which applies the ordering rules. Any additional tax goes on Form 5329. A conversion is when you move money from a traditional IRA into a Roth. It is taxable in the US. HMRC has published nothing on how it views a conversion by a UK resident, so treat that point as open.

A worked example: one withdrawal on both returns

Consider a typical case. It is an example, not a real client. Megan is a US citizen living in Bristol. She opened her Roth in 2012 and paid in $38,000 in total. Now 52, she has an account worth $90,000. She withdraws $48,000 in one payment.

The US return

Megan is under 59½, so the withdrawal is not qualified. Under the ordering rules, the first $38,000 is her own contributions and comes out tax-free. The remaining $10,000 is earnings. That slice is ordinary income on her Form 1040. In addition, it carries the 10% additional tax of $1,000 unless an exception applies. Form 8606 shows the split; Form 5329 shows the extra tax.

The UK return

If Article 17(1) governs, the $38,000 slice is exempt in Britain, matching its US treatment. The $10,000 earnings slice is taxable in the UK as foreign pension income. However, $48,000 is more than half of her fund. On HMRC's manual, that is generally a lump sum. Arguably, the 17(1)(b) exemption then falls away, and HMRC could look at the whole payment. The cautious course is to report the full payment on the SA106 foreign pages. Then claim the exemption for the contribution slice openly, citing the treaty article.

How a smaller payment would look

Suppose instead she drew $12,000 a year as part of a regular pattern. Each payment is well under a fifth of the fund, so it looks periodic rather than a lump sum. That is the Roth IRA UK resident pattern the treaty handles most cleanly. Moreover, every dollar comes from contributions under the ordering rules. Both countries would then treat it as tax-free. We show this only to illustrate how classification works. It is not a recommendation to time your withdrawals.

What should you check before any withdrawal?

Four questions decide nearly every Roth IRA UK resident case. Answer them in this order, because each one depends on the one before.

First and second: qualified status and slices

First, ask whether the five-year period is met and whether you are 59½ or older. If both are yes, the payment is qualified, and the treaty should exempt it in the UK. If not, work out the slices next. Gather your contribution history and any conversions from your custodian's records. Then apply the ordering rules to see how much is contributions and how much is earnings.

Third and fourth: payment size and paperwork

Third, compare the payment with the fund value. A payment above a fifth of the fund, and especially above half, may be treated as a lump sum. Fourth, decide what each return will show. The US return shows Forms 8606 and 5329 where needed. The UK return shows the payment, the exempt part and the treaty basis. Additionally, GOV.UK's page on being taxed twice on foreign income explains how the UK gives credit where both countries tax.

Records worth keeping

Keep every annual statement, each contribution confirmation and any conversion paperwork. For instance, an account opened twenty years ago can be hard to reconstruct later. Furthermore, note the exchange rate you used for each UK return. HMRC's foreign income guidance expects sterling figures, while the IRS works in dollars.

How US UK Tax Experts can help

US UK Tax Experts prepares your US and UK returns from one file, so a Roth withdrawal is described the same way on both. That consistency is what a Roth IRA UK resident return most often lacks. We work out the ordering-rule slices, prepare Forms 8606 and 5329, and set out the treaty basis on your UK return. In addition, we review whether a large payment risks lump-sum treatment and how to present a contested position. Our pension reporting service and treaty relief service cover both sides. For the wider picture, see our US UK tax returns guide. We also have a guide on 401(k) tax for UK residents.

Conclusion

For most owners, the Roth IRA UK resident picture is reassuring. Growth is sheltered by Article 18, and qualified withdrawals should be exempt in Britain through Article 17(1)(b). The weak points are early withdrawals, where the earnings slice is taxable in both countries, and large payments, where HMRC's lump-sum view creates real doubt. Therefore, build your contribution history now and check each payment against the four questions before you draw.

Contact us

If you plan a Roth withdrawal while living in Britain, or you have already taken one, email us at hello@usuktaxexperts.com or use our contact form. Tell us the account value, your contribution history and the payment. We reply within one working day.