The US-UK Income Tax Treaty
IRS & HMRC, Guide
How the US-UK income tax treaty allocates taxing rights, and where its saving clause limits what US citizens can claim.
The US-UK Income Tax Treaty: the short answer
The US-UK income tax treaty decides which country may tax each kind of income and how the other gives relief. It covers residence, business profits, dividends, pensions and gains, among other things. For US citizens its reach is narrower than it looks, because of the saving clause.
What the treaty does and does not change
The treaty was signed in 2001 and replaced an older agreement.
Article 4 decides residence when someone is resident in both countries under domestic law, using a sequence of tie-breakers: permanent home, centre of vital interests, habitual abode, then nationality. Other articles assign taxing rights by type of income. Article 10 limits source country tax on dividends, with a general rate of 15% on portfolio holdings. Article 24 sets out how each country gives relief for the other's tax.
The saving clause in Article 1(4) lets the US tax its citizens as if the treaty did not exist. Only the exceptions listed in Article 1(5) survive it. That is why a US citizen resident in the UK cannot use most articles to reduce US tax. Relief still comes largely from domestic US rules, principally the foreign tax credit, with the treaty's resourcing rules helping in some cases to avoid unrelieved double tax.
Pensions show how precise the treaty is. Under Article 18, growth inside a qualifying UK pension is generally protected from current US tax for a US citizen. Relief for contributions is narrower and limited by the saving clause, so the two should never be treated as one benefit. Article 17 deals with pension payments. Social security coverage is governed by a separate totalization agreement, and estate and gift taxes by a separate treaty.
At a glance
- 2001, replacing an earlier agreement
- Signed
- Article 1(4), with exceptions in Article 1(5)
- Saving clause
- 15% at source
- Portfolio dividend rate
- Form 8833 where a position modifies US law
- Disclosure
Figures are for the tax year stated in the official instructions linked below.
How we handle it
- Treaty Relief
Claims under the US/UK income tax treaty, with Form 8833 disclosure, residence tie-breaker analysis and reduced withholding on US income.
- US/UK Pensions
How workplace pensions, SIPPs, 401(k)s and IRAs are taxed and reported when the saver and the scheme are in different countries.
- Cross-Border Tax
US and UK returns prepared together from one set of workpapers, so credits, tax years and exchange rates line up across both.
- International Tax
US reporting for owners of UK companies and partnerships, and for UK groups with US entities, including Forms 5471, 8858, 8865 and 5472.
Where people go wrong
The misreadings we correct most often.
Who this affects
- Dual residents deciding which country treats them as resident
- US citizens in the UK with pensions, dividends or gains in both countries
- British residents with US investment or property income
- UK companies receiving US dividends, interest or royalties
01
Relying on a treaty article as a US citizen without checking the saving clause
02
Treating pension contribution relief and pension growth protection as the same benefit
03
Assuming US states follow the treaty in the same way as federal law
04
Confusing the income tax treaty with the separate totalization agreement
Why US UK Tax Returns
Every form is prepared against the official instructions, and every position on it is one we can point to in the Code, the treaty or HMRC's guidance.
One File
US and UK returns prepared in the same engagement and reconciled line by line.
Primary Sources
Every position traced to the Code, the treaty, IRS instructions or HMRC guidance.
Scope First
Returns, forms, years and fee agreed in writing before work begins.
The Same People
The team that files this year carries the elections and credits into the next.
Questions we are asked
I am a US citizen living in London. Does the treaty mean I only pay UK tax?
No. The saving clause lets the US tax its citizens as though the treaty did not exist, apart from specific exceptions. In practice relief for UK tax comes mainly through the US foreign tax credit, and the US still expects a full return. Some articles, such as those on certain pensions, do help US citizens. Which ones apply depends on the income type.
How does the tie-breaker decide where I live for tax purposes?
Article 4 applies a series of tests in order: where you have a permanent home, then where your personal and economic ties are closer, then where you habitually live, then nationality. If none settles it, the two tax authorities agree between them. Claiming UK residence under the tie-breaker is disclosed to the IRS on Form 8833, and green card holders need to consider the expatriation rules first.
Does the treaty cover US state taxes?
The income tax treaty is largely a federal matter. US states run their own tax systems, and some do not follow the treaty in the same way, so income relieved at federal level may still be taxed by a state. This most often affects former residents of states that still treat them as domiciled there. The answer depends on the state involved.
Primary sources
What this page says is drawn from the official material below. Read it yourself; we would rather be checked than trusted.
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