US-UK Tax

How is a Roth IRA taxed in the UK?

Answered by Jordan Onraet-Wells, Founder & Chartered Tax Adviser (CTA). Published 28 September 2026. Last reviewed 28 September 2026.

The short answer

A qualified Roth IRA distribution is generally tax-free in the UK. Article 17(1)(b) of the UK-US double tax treaty requires the UK to exempt any pension payment that would be exempt from US tax if you were resident there, and HMRC's own manual confirms that an IRA distribution to a UK resident is exempt in the UK to the same extent it would be exempt in the US. The exemption is only as good as the distribution being genuinely qualified under US rules, so a non-qualified withdrawal, and the US 10% early-withdrawal charge, are not sheltered.

Article 17(1)(b) of the UK-US treaty is a mirror rule: the UK must exempt the part of a US pension payment that would be exempt from US tax if you were US resident.
HMRC's Double Taxation Relief Manual (DT19853) states that a distribution from a US IRA to a UK resident is exempt from UK tax to the same extent it would be exempt from US tax.
The treaty definition of a pension scheme expressly includes a Roth IRA (a section 408A plan), so it is analysed as a pension, not as an ordinary offshore investment account.
The UK exemption depends on the distribution being a qualified Roth distribution for US purposes: generally the account open at least five years and you aged 59 and a half, or another qualifying condition met.
A Roth conversion is a US taxable event in the year of conversion; the prevailing adviser view is that it is not itself a UK taxable event, to be confirmed on your facts.
Disclose the distribution on your Self Assessment return and claim the treaty exemption; the UK's 25% tax-free lump sum has nothing to do with a Roth.

Why the UK mirrors the US exemption

Once you are UK resident, the UK can tax your worldwide income, including money drawn from US retirement accounts. The UK-US treaty then decides who taxes what. Article 17(1)(a) gives taxing rights over pensions to your country of residence, which is why regular 401(k) and traditional IRA payments are UK-taxable. Article 17(1)(b) is the mirror rule that saves the Roth: the residence state must exempt any part of the pension that would be exempt in the source state if you lived there. HMRC's manual applies this to IRAs in terms, and a qualified Roth distribution is free of US federal income tax, so the UK exempts it too. Our guide to 401(k), IRA and Roth UK tax treatment sets out each account, and the UK-US treaty guide explains the articles.

Qualified means qualified

The UK answer keys off the US character of the payment. A qualified Roth distribution generally needs the account open for at least five years and you to be 59 and a half, or another qualifying condition to be met. A non-qualified distribution that would be partly taxable in the US does not get full UK exemption, and the 10% additional US tax on withdrawals before 59 and a half is a US charge the treaty does not remove; because it would not be exempt if you were US resident, the mirror rule does not shelter it either. One honest caveat: HMRC's DT19853 gives the IRA example but does not spell out Roth versus traditional, so the Roth conclusion comes from applying the mirror rule to a qualified distribution. Where the sums are large, written confirmation for your facts is sensible, as our guide for Americans living in the UK explains.

Conversions, reporting and the traps

Moving pre-tax 401(k) or traditional IRA money into a Roth is a US taxable event in the year of conversion. The prevailing view among cross-border advisers is that the conversion is not itself a UK taxable event, and neither is the later qualified distribution, so for a UK resident there is often no UK tax at either step, to be confirmed on your facts. Treat marketing that says the FIG regime is needed to shelter a conversion with caution. Even an exempt Roth distribution should be disclosed on the foreign pages of your Self Assessment return with the treaty exemption claimed, so the position is transparent. US citizens keep a parallel US return, and our FBAR and FATCA guide covers the information reporting; a US-held Roth is not itself an FBAR account.

Go deeper

Sources and further reading

This is general information for the 2026/27 UK tax year, not personal tax advice; speak to a Chartered Tax Adviser about your own position.

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