Read a free sample: Tax Planning With Double Tax Treaties

An extract from Chapter 1

What a double tax treaty can do

A double tax treaty is an agreement allocating taxing rights between its parties and providing mechanisms to relieve double taxation. The two countries may each have a domestic basis for taxing the same person or receipt. The treaty can reserve taxation to one country, permit both to tax subject to a ceiling, or require the residence country to give credit or exemption.

The practical distinction is between permission and a charge. A treaty saying that income “may be taxed” in a country does not usually impose that country's tax. Its domestic law must impose a charge first. Conversely, a domestic exemption can produce a better result than the treaty ceiling. You do not normally elect to pay a treaty maximum when domestic law charges less.

For example, suppose Country A has a domestic 20% deduction on a particular payment, but the applicable treaty limits that deduction to 10%. A qualifying recipient can seek the 10% treatment through the required procedure. If Country A instead exempts the payment under domestic law, the treaty's 10% ceiling does not create a 10% bill. The recipient's residence country must then be considered separately.

The figures in this example are hypothetical. They illustrate the relationship between a domestic charge and a treaty ceiling; they are not a quoted rate for any country or payment.

Inside the full guide

• Finding and reading the agreement: treaty residence, beneficial ownership and treaty abuse.
• Work and business: services across borders, employment, corporate residence and digital business.
• Income and investments: withholding taxes, authors and copyright income, dividends and pensions.
• Family wealth: inheritance tax and estate treaties, including the UK–US estate and gift treaty.
• Applying the rules: capital gains, foreign income and gains, country examples, effective dates, claims and case studies.

The guide focuses on the 2025/26 UK tax year. Developments after that year are identified separately. It is a UK-focused guide rather than a complete statement of every partner country's tax law.

Official background reading

• HMRC: the relationship between domestic charges and treaty relief.
• HMRC: treaty ceilings and domestic rates, illustrated in its US treaty summary.

Planning to leave the UK? Moving to the UK? Start with the relevant checklist.

This is a short extract, not the full chapter or personal tax advice. Apply the law and treaty effective for your circumstances and transaction.