Two Concepts. One Critical Distinction.
Residency and domicile are not interchangeable, and confusing them is among the most expensive errors a UHNW principal can make in international tax planning. Residency is primarily a factual determination — where you spend your days. Domicile is a legal status, often inherited at birth, that can follow you across borders regardless of where you live and can determine which country’s inheritance laws apply to your estate on death.
Tax Residency: The Factual Test
Most jurisdictions determine tax residency through one of three tests: days spent (the most common), a centre of vital interests analysis, or a fixed abode test. The UAE’s zero-income-tax environment attracts significant UHNW principal relocation, but establishing genuine UAE tax residency requires more than a visa and a property. Days must be documented, ties to the home country must be severed, and the principal’s personal and economic centre of gravity must demonstrably shift.
Principals who spend 183 days in the UAE but maintain a family home, children in school, business directorships, and a social life in their home country should not assume residency has migrated. Home-country tax authorities increasingly use substance-over-form analysis that looks at where the principal actually lives, not where they are nominally registered.
Domicile: The Harder Problem
English common law domicile — still relevant in the UK, Ireland, Australia, South Africa, and many Commonwealth jurisdictions — operates quite differently from tax residency. A person acquires a domicile of origin at birth, typically from their father. This domicile of origin is remarkably sticky: it revives automatically if a domicile of choice is abandoned, even after decades.
UK inheritance tax exposure, for instance, follows domicile, not just residency. A principal domiciled in the UK — even one who has been resident in Dubai for 15 years — remains exposed to UK inheritance tax on worldwide assets unless they have properly established a domicile of choice elsewhere. The evidence required is onerous: clear intent to reside permanently in the new jurisdiction, combined with actual long-term residence.
The Non-Dom Regime and Its Limits
The UK’s non-domiciled resident regime — under which non-domiciled individuals resident in the UK could elect to pay UK tax only on UK-source income and remitted foreign income — was significantly curtailed from April 2025. Principals who structured their affairs around this regime require urgent review, as the transitional provisions and alternative structures differ substantially from the previous regime.
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