From 6th April 2025, the UK abandoned the traditional concept of domicile for inheritance tax (IHT) purposes. Instead, it hinges on whether someone is a long-term UK resident. Under this new regime, an individual is deemed a long-term UK resident if they have been tax-resident in the UK for at least 10 of the preceding 20 tax years.

Until the 6th April 2025, the UK’s taxation of individuals who were non-doms was based on the concept of domicile, a legal term under English law referring to a person’s long-term permanent home. Non-doms could live in the UK while enjoying favourable tax treatment under the “remittance basis”. This treatment typically lasted for up to 15 years.