The Saving Clause in the US/UK Tax Treaty: Why It Helps Americans Less Than They Expect

The saving clause in the US/UK tax treaty is Article 1(4), and it lets each country tax its own residents, and by reason of citizenship its own citizens, as if the convention had not come into effect. For an American in the UK that reverses the usual expectation: the treaty does not switch off US tax, and only the short list of exceptions in Article 1(5) survives it.

What does the saving clause in the US/UK tax treaty actually do?

Article 1(4) of the 2001 convention reads: "Notwithstanding any provision of this Convention except paragraph 5 of this Article, a Contracting State may tax its residents (as determined under Article 4 (Residence)), and by reason of citizenship may tax its citizens, as if this Convention had not come into effect." The Treasury technical explanation calls it "the traditional saving clause found in U.S. tax treaties", under which the countries "reserve their rights, except as provided in paragraph 5, to tax their residents and citizens as provided in their internal laws".

The technical explanation's own example is the clearest statement of the effect. A UK resident performing professional services in the United States with no permanent establishment there would, under Article 7, be outside US tax. But "if, however, the resident of the United Kingdom is also a citizen of the United States, the saving clause permits the United States to include the remuneration in the worldwide income of the citizen and subject it to tax under the normal Code rules".

That is the whole mechanism. The treaty allocates taxing rights between the two countries; the saving clause then hands the United States back its right to tax Americans regardless of the allocation. Americans in the UK keep filing US returns on worldwide income — the IRS states the position plainly on its page for US citizens and resident aliens abroad — and rely on foreign tax credits rather than treaty exemptions for most of their income. We set out how that works in our guide to double taxation relief between the US and UK.

Which treaty benefits survive the saving clause?

Article 1(5) is the list of survivors, and it is exhaustive. It was deleted and replaced by Article I of the 2002 protocol, so the current wording is not the wording in the original 2001 text — a trap for anyone reading an old copy. As amended, sub-paragraph (a) preserves these for everyone, citizens included:

• Article 9(2) — the right to a correlative adjustment where profits are reallocated between associated enterprises.
• Article 17(1)(b), (3) and (5) — certain pension payments that would be exempt in the source country, social security paid by one country to a resident of the other, and child support and similar payments.
• Article 18(1) and (5) — the deferral of tax on income earned inside a pension scheme, and relief for contributions by or for a US citizen to a UK pension scheme.
• Articles 24, 25 and 26 — relief from double taxation, non-discrimination, and the mutual agreement procedure.

Sub-paragraph (b) preserves a second set — Article 18(2), and Articles 19, 20, 20A and 28 on government service, students, teachers and diplomatic agents — but only for people who are "neither citizens of, nor have been admitted for permanent residence in" the country concerned. The technical explanation describes these as benefits for temporary residents, "in the case of the United States, holders of non-immigrant visas". An American, or a green card holder, does not get them from the United States.

Who does the saving clause actually catch?

The clause reaches citizens by reason of citizenship, and residents "as determined under Article 4". That second limb matters more than it looks, because Article 4 includes the tie-breaker. The technical explanation spells it out: an individual who is a US resident under the Code but is deemed UK resident under the tie-breaker "would be subject to U.S. tax only to the extent permitted by the Convention", and "the United States would not be permitted to apply its statutory rules to that person if they are inconsistent with the treaty".

So a non-citizen — including a green card holder — can get out from under the saving clause by winning the Article 4 tie-breaker, which is why the residence analysis in our post on the treaty tie-breaker rule for tax residency is worth doing carefully. A US citizen cannot: citizenship is a separate limb with no tie-breaker attached.

Even for the person who escapes, the escape is partial. The technical explanation notes they are "treated as a U.S. resident for U.S. tax purposes other than determining the individual's U.S. tax liability", giving the example that their shares still count as held by a US resident when testing whether a foreign company is a controlled foreign corporation — which can pull other US shareholders into current income inclusions.

What the saving clause takes away in practice

The table below shows where the clause bites for a US citizen living in the UK, and where the exceptions hold. Each row is the start of an analysis, not a conclusion on your facts.

Treaty provision	What it would do	Survives for a US citizen?
Article 7, business profits	Keep UK business profits outside US tax absent a US permanent establishment	No — the technical explanation's own example
Article 14, employment income	Allocate UK employment income to the UK	No — relief comes through the Article 24 credit instead
Article 17(2), pension lump sums	Tax a lump sum only in the country where the scheme is established	No — Article 17(2) is not in the Article 1(5) list
Article 17(1)(b), certain pension payments	Exempt payments that the source country would exempt	Yes — expressly preserved
Article 17(3), social security	Tax social security only in the country of residence	Yes — expressly preserved
Article 18(1), growth inside a pension scheme	Defer US tax on income earned within the scheme until it is paid out	Yes — expressly preserved
Article 18(5), UK pension contributions	Give US relief for contributions to a UK scheme by a US citizen	Yes — added to the list by the 2002 protocol
Article 24, relief from double taxation	Require each country to credit the other's tax	Yes — expressly preserved

The third row is the one that costs real money. A UK pension commencement lump sum is tax-free under UK rules, and many Americans assume the treaty carries that across. Article 17(2) is the paragraph that deals with lump sums, and it is absent from the exception list. Whether a particular payment might instead sit within the protected Article 17(1)(b) depends on how it is characterised, which is a position to settle in advance. Our post on how UK pensions are taxed on a US return goes through the mechanics.

The exception most Americans in the UK miss

Article 18(5) is the quiet win. Where a US citizen resident in the UK is in UK employment whose income is taxable in the UK and borne by a UK employer or UK permanent establishment, and is a member of a UK pension scheme, then contributions they pay "shall be deductible (or excludable) in computing his taxable income in the United States", and employer contributions and accrued benefits "shall not be treated as part of the employee's taxable income" in the US. Three conditions ride with it:

1. The paragraph applies "only to the extent that the contributions or benefits qualify for tax relief in the United Kingdom".
2. The relief "shall not exceed the reliefs that would be allowed by the United States to its residents" for a generally corresponding US scheme.
3. It "shall not apply unless the competent authority of the United States has agreed that the pension scheme generally corresponds to a pension scheme established in the United States".

Illustrative example: an American working in London for a UK employer pays into the employer's UK workplace pension, and the employer contributes as well. Without Article 18(5) the employer contributions and the growth could be exposed to US tax as they arise. With Article 18(5) and Article 18(1), the contributions can reduce US taxable income and the growth is deferred, within US limits for a corresponding scheme. This is illustrative only; the outcome depends on the scheme, the amounts and the conditions above.

Former citizens and long-term residents: ten more years

Giving up the status does not immediately end the clause. Article 1(6) treats a former citizen or former long-term resident whose loss of status "had as one of its principal purposes the avoidance of tax" as a citizen for saving clause purposes "but only for a period of 10 years following the loss of such status", and only for income from sources within that country. It does not apply to anyone who ceased to be a citizen or long-term resident before 6 February 1995. The exit tax rules that sit alongside this are covered in our post on the tax implications of renouncing US citizenship.

How do you claim what survives?

The exceptions are not self-executing. A position that a preserved article overrides the Code is a treaty-based return position, so it belongs in the disclosure analysis set out in our guide to Form 8833 treaty position disclosure — bearing in mind that reporting is waived for many individual pension and social security positions, and that the form carries a $1,000 penalty for an individual who fails to disclose when disclosure is required. Article 18(5) in particular depends on a competent authority agreement about the scheme, so the file should record why the scheme qualifies.

Our saving clause and US/UK tax treaty service maps each item of income to its article, separates what the clause overrides from what survives, and documents the positions that are worth taking. We do this most often for Americans living in the UK.

What people get wrong about the saving clause

• Reading the 2001 text and stopping. The 2002 protocol replaced Article 1(5) outright. A list that omits Article 18(5) or Article 20A is the superseded one.
• Assuming the treaty exempts UK income. For a US citizen it usually does not. The relief is a credit under Article 24, not an exemption.
• Treating a UK tax-free lump sum as US tax-free. Article 17(2) is not on the survivors list.
• Thinking the tie-breaker rescues a US citizen. It can rescue a green card holder from resident status; citizenship is reached separately and has no tie-breaker.
• Forgetting Article 18(5). It is the one exception written specifically for Americans in UK pension schemes, and it is routinely left unclaimed.
• Assuming renunciation ends it. Article 1(6) can extend the clause for ten years where tax avoidance was a principal purpose of the loss of status.

The bottom line

The saving clause is why the US/UK treaty disappoints Americans who expect it to exempt their UK income: it hands the United States its taxing rights back, and leaves only Article 1(5)'s list intact. The useful response is not to argue with the clause but to work the list — the credit under Article 24, the pension provisions in Articles 17 and 18, and the procedural rights in Articles 25 and 26 — and to claim each one properly.

US/UK Cross Border Tax — US CPAs and UK tax advisers working as one team; London, Manchester, New York, San Francisco. If you have been told the treaty protects your UK income, let us check which parts of it actually reach you.