UK Domicile Test

Domicile of origin

You acquire a domicile of origin at birth — determined by the domicile of your father (or mother in certain cases) at the time of your birth, not by your nationality or place of birth. If your father was UK domiciled when you were born, you acquire a UK domicile of origin regardless of whether you were born outside the UK. A domicile of origin is extremely tenacious: it lies dormant when you acquire a domicile of choice elsewhere, but revives automatically the moment you leave that other country without intending to settle permanently in a new one.

Domicile of choice

A domicile of choice is acquired by a combination of physical presence in a country and a clear, settled intention to reside there permanently with no intention to return to the country of domicile of origin. The legal threshold is high — courts and HMRC look at the totality of a person's circumstances, including where they own property, where their family lives, the terms of their will, business interests, and expressed intentions over time. Many UK nationals who have lived abroad for decades still fail to establish a domicile of choice because their intention to return to the UK "one day" has never fully been abandoned.

Long-term residence and IHT (from 6 April 2025)

The old "deemed UK domicile" concept and the 15-of-20-years rule were abolished on 6 April 2025. IHT exposure to your worldwide estate is now determined by long-term residence: you are a long-term UK resident — and your worldwide estate is within UK IHT — once you have been UK resident for at least 10 of the previous 20 UK tax years. This status does not fall away immediately when you leave: a tail period of between 3 and 10 years (depending on how long you were resident) applies before your overseas estate moves outside the UK IHT net.

The 2025 non-dom reform: what changed and what did not

On 6 April 2025, the government introduced a significant reform of the UK's non-domicile tax regime. The remittance basis of taxation — which had allowed non-UK domiciled individuals to pay UK tax only on UK-source income and gains remitted to the UK — was abolished and replaced with a residence-based foreign income and gains (FIG) exemption for new arrivals to the UK for their first four years of UK residence.

Inheritance Tax also moved onto a residence basis. Since 6 April 2025, exposure of your worldwide estate to IHT is determined by long-term residence (UK resident for at least 10 of the previous 20 tax years) rather than by domicile. Domicile concepts survive only in limited transitional and trust contexts. Given the pace of legislative change, professional advice from a tax adviser who specialises in international mobility is essential for any individual with significant overseas assets.

Need specialist domicile and IHT advice?

Global Investments works with internationally mobile individuals on cross-border estate planning, domicile analysis, and IHT mitigation structures. Speak to a qualified adviser for a review of your personal position.