How Double Taxation Agreements Work: A Guide for Internationally Mobile Individuals

Internationally mobile individuals face a practical problem: if you are tax-resident in two countries simultaneously, or if you receive income from a country where you no longer live, two countries may have the legal right to tax the same income. Without a mechanism to prevent it, you could pay full tax on the same income twice.

Double Taxation Agreements (DTAs, also known as tax treaties) address this. They are bilateral treaties between two countries that allocate taxing rights — determining which country taxes specific types of income, and what credit or relief the other country must give. For internationally mobile individuals, the DTA between the UK and your country of residence is one of the most important documents in your financial life.

What a DTA Is

A DTA is an international treaty, incorporated into domestic law by both signatories. Each DTA specifies:

• Which country has the right to tax specific categories of income (employment income, business profits, dividends, interest, royalties, pensions, capital gains, property)
• How double taxation is prevented (exemption method or credit method)
• How to resolve conflicts where both countries claim the individual as a resident (the "tie-breaker" article)
• Rules for the exchange of information between the two countries' tax authorities

The UK has an extensive DTA network — over 130 treaties in force as of 2026. The HMRC website publishes the full text of each treaty.

The OECD Model Tax Convention

Most UK DTAs are based on the OECD Model Tax Convention on Income and Capital — a template developed by the Organisation for Economic Cooperation and Development that most developed countries use as the starting point for negotiating bilateral treaties. This makes DTAs broadly similar in structure and terminology, even where the specific provisions differ.

The OECD Model is not a treaty itself — it is a template. The actual DTA between the UK and any specific country is negotiated separately and may differ significantly from the Model in particular articles. The UK-US treaty, for example, has features not found in the standard OECD Model. The UK-UAE treaty has specific provisions reflecting the UAE's particular tax position.

Always read the specific DTA, not just the OECD Model, before relying on a particular rule.

The Residence vs Source Principle

The fundamental principle of most DTAs: income is generally taxed in the country of residence (where you live). The source country (where the income originates) has taxing rights in certain specific cases.

Source country taxation typically applies to:

• Property income: rental income and capital gains on immoveable property are taxable where the property is situated. A UK resident with French rental income pays French tax on that income (and gets a credit in the UK). A non-UK resident with UK property pays UK tax on rental income and capital gains.

• Business profits with a permanent establishment (PE): a PE is a fixed place of business in the source country. If a UK company has a PE in Germany (a branch office, for example), Germany can tax the profits attributable to that PE.

• Employment income: taxable in the country where the work is performed. If you are employed and working in France (even for a UK employer), France can tax that employment income.

Residence country taxation applies to:

• Investment income (dividends, interest) where there is no PE: the residence country has primary taxing rights, though some DTAs allow the source country to withhold tax at a reduced rate
• Most pension income (though this varies significantly — see below)
• Capital gains on most assets other than real property

Exemption vs Credit Method

DTAs use one of two mechanisms to prevent double taxation:

Exemption method: the residence country simply does not tax income that the source country has taxed. If the France-Germany DTA exempts France from taxing German employment income, a France-resident working in Germany pays only German tax.

The UK rarely uses the exemption method in its DTAs — it typically uses the credit method.

Credit method: both countries may tax the income, but the residence country gives a credit for the tax paid to the source country. If you pay 25% Spanish tax on Spanish income, and the UK rate on that income is 45%, you pay 25% to Spain and 20% to the UK (45% - 25% = 20% remaining UK liability).

The credit is typically limited to the amount of UK tax on that income — so if the source country rate is higher than the UK rate, you get no refund of the excess. The credit prevents double taxation but does not eliminate single-country taxation entirely.

Key Income Type Articles

Dividends

Most DTAs allow the source country to withhold tax on dividends at a reduced rate (lower than the domestic rate). For example, a DTA might cap the withholding tax on dividends at 15% rather than the domestic rate of 25%.

The UK pays dividends to non-residents largely without withholding tax under UK domestic law (UK has no standard dividend withholding tax). Many other countries do — and the DTA determines the reduced treaty rate.

For a UK resident receiving dividends from a foreign company, the DTA determines what withholding tax the foreign company must deduct and what credit the UK resident gets in the UK.

Interest

Similar to dividends, many DTAs cap withholding tax on interest at a reduced rate. Some DTAs exempt interest from source-country withholding entirely.

Royalties

Royalties on intellectual property are often subject to withholding tax in the source country. The DTA reduces or eliminates this for qualifying residents of the other country.

Employment Income

Employment income is generally taxable where the work is performed. Most DTAs include a "183-day rule" exception: if the employee spends fewer than 183 days in a tax year in the source country, and is paid by an employer resident in the other country, and the cost is not borne by a PE in the source country, the source country may not tax the employment income.

This 183-day rule is frequently misunderstood. It is not simply a count of days — all three conditions must be satisfied. Short-term business visitors from one country to another should take advice on whether they cross the threshold.

Pensions

The pension article is among the most variable in UK DTAs. Key variations:

• Exclusive residence country taxation: some DTAs (UK-UAE, for example) give only the country of residence the right to tax pensions paid from the other country. A UAE resident with a UK-source pension is taxed only in the UAE — and if the UAE does not tax personal income, the pension is entirely tax-free.

• Source country (UK) taxation: other DTAs give the UK the right to tax UK pensions regardless of where the recipient lives. The UK-France treaty has historically treated certain UK pensions as taxable in the UK.

• Government pensions: most DTAs contain a specific article for government service pensions (military, civil service) that often gives exclusive taxing rights to the country that paid the pension.

Given the significant variation, always read the specific DTA for pension income before assuming any particular tax treatment.

The Tie-Breaker Article

An individual may be resident in both countries simultaneously under each country's domestic rules. For example: a person who retains a UK home and spends 200 days per year in the UK, but also has their family and business in France — they could be UK-resident under the UK Statutory Residence Test and French-resident under French domestic law.

The DTA tie-breaker resolves this by designating one country as the country of residence for treaty purposes, using a hierarchical test:

1. Permanent home: where does the individual have a home that is "available to them at all times" (not a temporary or casual residence)? If the individual has a permanent home in only one country, that country "wins." If they have permanent homes in both countries (common for HNW individuals), move to test 2.

2. Centre of vital interests: in which country are the individual's personal and economic ties stronger? This looks at: the location of family; the location of the primary business activities; the location of significant assets; social and cultural ties. If clearly centred in one country, that country wins. If unclear, move to test 3.

3. Habitual abode: in which country does the individual habitually reside? This is primarily a count of days, with some qualitative assessment. If inconclusive, move to test 4.

4. Nationality: if the individual is a citizen of only one of the two countries, that country wins. If they hold dual nationality or the nationality test is inconclusive, the matter must be resolved by mutual agreement between the competent authorities of the two countries (a process that can take years).

The tie-breaker does not change domestic law — it only determines which country has treaty residence. You may still have domestic law obligations (filing requirements) in both countries even after the tie-breaker assigns treaty residence to one of them.

Reading Your Specific DTA

The DTA between the UK and your country of interest is freely available from HMRC's website (hmrc.gov.uk → DTA page) and from the OECD's tax database. Key articles to read for any DTA:

• Article 4: Residence (definition and tie-breaker)
• Article 6: Income from immoveable property (rental income)
• Article 10: Dividends
• Article 11: Interest
• Article 13: Capital gains
• Article 15: Employment income
• Article 17/18: Pensions (article number varies)
• Article 21: Other income (catches-all for income not covered elsewhere)
• Article 23: Elimination of double taxation (which method — exemption or credit)
• Article 25: Mutual agreement procedure

DTAs are not light reading — but understanding the relevant articles for your situation is important. Professional advice that references the specific DTA text is worth seeking for material tax decisions.

---

DTA interpretation is a specialist area. The application of treaty provisions to individual circumstances can be complex and uncertain. This article provides a general overview only. Seek qualified professional advice for any significant cross-border tax planning.

How Global Investments can help

Global Investments works with clients on cross-border tax planning — incorporating DTA analysis, tie-breaker residency planning, and the interaction between UK tax obligations and the tax rules of the destination country. Our advice integrates the treaty position with practical financial planning, ensuring clients are tax-compliant in all relevant jurisdictions while minimising their total tax burden. Contact our team to discuss your international tax situation.