A double tax treaty is a bilateral agreement that decides which country may tax each kind of income or gain, limits the tax the source country can charge, and settles residence for people who are resident in both countries. In the UK a treaty takes effect through an Order in Council under section 2 of TIOPA 2010. Relief is claimed by credit on a UK return for UK residents, or by a claim to HMRC for non residents with UK income.

How does a treaty become part of UK law?

Section 2 of the Taxation (International and Other Provisions) Act 2010 gives effect to arrangements specified in an Order in Council for relief from double taxation. The taxes covered are income tax, corporation tax, capital gains tax and petroleum revenue tax, plus foreign taxes of a similar character. Section 6 says the arrangements have effect despite anything in any enactment, for purposes including relief from tax, taxing UK source income of non residents and attributing profits to branches.

HMRC’s International Manual explains the limits of that override (INTM152060):

  • Treaties complement and usually override domestic law, but cannot create a charge where domestic law imposes none.
  • A treaty does not by itself release a UK payer from a duty to deduct tax. The non resident has to claim, and only HMRC’s authorisation lets the payer pay gross or at a reduced rate.

Most UK treaties are comprehensive, covering all kinds of income and gains. A few are limited to shipping or air transport profits (INTM151050).

How is a treaty structured?

UK treaties since the OECD published its model convention have followed that model, with variations for each partner country. Some older agreements, mainly with former colonies, predate it (INTM152050). HMRC describes the normal form as some 30 articles in three groups (INTM153010):

Articles What they cover
1 to 5 Who is covered, which taxes, definitions, residence and permanent establishment
6 to 21 Each type of income: property, business profits, dividends, interest, royalties, employment, pensions, students, other income, and often capital gains
The remainder Elimination of double taxation, non discrimination, mutual agreement procedure, exchange of information, entry into force and termination

The numbering and wording vary, so you must always read the treaty with the country concerned rather than rely on the model.

What do the income articles typically do?

Each income article gives taxing rights to one or both countries. Where both can tax, the source country’s rate is often capped, which is usual for dividends, interest and royalties, and the residence country gives credit (INTM151040). Some examples:

  • Employment. Under OECD style treaties, pay for work in the other country is taxable only in your country of residence if you are present there for no more than 183 days in any 12 month period, your employer is not resident there, and the pay is not borne by a permanent establishment there. Many older treaties count the 183 days by calendar or fiscal year (INTM153170).
  • Elimination of double taxation. For the UK, this article provides credit for foreign tax on income or gains arising to a UK resident, and income that the treaty lets the other country tax is deemed to have its source there (INTM153250). How the credit is calculated is covered in foreign tax credit relief.
  • Relief limitation. Many treaties restrict exemptions where the residence country taxes only amounts remitted or received (INTM153320).

Who counts as a resident under a treaty?

The residence article treats a person as resident in a country if they are liable to tax there by reason of domicile, residence, place of management or a similar criterion. It excludes someone taxed there only on income from that country (INTM153050). UK domestic residence comes from the statutory residence test, including any split year, but the split year rules do not decide treaty residence.

A person resident in both countries under their own laws is a dual resident. Modern treaties then apply tie breaker tests one after another until one country wins (INTM154020 and HS302):

  1. Permanent home. Accommodation always available for your use, owned or not.
  2. Centre of vital interests. Where your personal and economic relations are closer, if you have a permanent home in both countries.
  3. Habitual abode. Where you live regularly, normally or customarily.
  4. Nationality.
  5. Agreement between the two tax authorities if none of the above settles it.

Some older agreements, including those with Guernsey, Jersey, the Isle of Man, Malta and Singapore, define residence differently, so a person resident in both can only get credit for one country’s tax against the other’s (INTM154030).

Being treaty resident elsewhere does not end UK residence for domestic purposes. You must still file returns, and you keep any allowances due as a UK resident (INTM154020). The UK’s foreign income and gains regime also ignores treaty non residence when counting years of UK residence.

How does a tie breaker work in practice?

Illustration only. Tom, a UK national, is UK resident under the statutory residence test and also resident in a treaty country under its rules. He has a rented flat in each country, always available to him. The permanent home test therefore does not decide it. His spouse, children, main bank accounts and business remain in the UK, so his centre of vital interests is the UK, and he is treaty resident in the UK. The other country must then limit its tax on his income to what the treaty allows, and the UK gives credit for that tax. Had his family and business been abroad, he would be treaty resident there and could claim UK relief on income the treaty reserves to that country.

How do you claim treaty relief?

UK residents with foreign income

Where the foreign tax has already been paid, you claim credit on the foreign pages of your return. Where the treaty requires relief to be claimed in the source country, or the income is exempt there under the treaty, you apply to the foreign authority, with HMRC certifying your residence on its form or a UK certificate of residence (GOV.UK, If you’re taxed twice). Individuals, companies, partnerships and trusts can apply for a certificate online; HMRC will not issue one if you are not entitled to treaty benefits, and the foreign authority decides whether to grant relief.

Non residents with UK income

A non resident can claim relief from UK tax on items such as interest, royalties, most work pensions, annuities and UK dividends. HMRC helpsheet HS304 explains the claim for those filing a return, which needs a certificate of residence from your own country’s tax authority. Form DT Individual is used to apply for relief at source or a repayment. Separate schemes apply to some income, such as rent under the non resident landlord scheme.

Dual residents

A UK resident who is treaty resident elsewhere uses helpsheet HS302 to show residence in the other country, apply the tie breaker and list the income for which relief is claimed. HS302 says US residents do not need a certificate of overseas residence.

What if both countries still tax you?

If you think either country is taxing you contrary to the treaty, you can ask a competent authority to intervene under the mutual agreement procedure, with a full statement of the facts and both sides’ contentions (INTM153270). Older treaties require the request to go to your country of residence; newer ones allow either country (INTM423020). Under section 124 TIOPA 2010, HMRC must give effect to a resolution despite any enactment, and a consequential claim can be made within 12 months of notification of the solution.

What are the common mistakes?

  • Relying on the OECD model or a summary rather than the actual treaty text.
  • Assuming a treaty stops UK withholding automatically, with no claim.
  • Treating treaty residence elsewhere as ending UK filing obligations.
  • Forgetting that a treaty cannot override anti avoidance rules expressed to apply regardless, such as temporary non residence.
  • Applying for relief abroad without first securing a certificate of residence.

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Sources

Reviewed by Christine Anderson, Broker, Solar Protect. Last reviewed 8 October 2026. Part of Accountapedia, the Solar Protect guide to UK tax and accounting. This page is general information, not personalised advice.