When a Billionaire Moves, Their Tax Residence May Stay Behind 

By Peter Kovacs

Relocation can change a family’s address overnight, but tax residence may depend on enduring personal connections, economic interests and treaty rules.  

An entrepreneur leaves a long-established home, buys an apartment abroad and obtains a new residence permit. The move may be entirely genuine, yet the former country may still regard that person as tax resident. Immigration status and tax residence answer different legal questions, and a departure date rarely resolves them both. For internationally mobile families, the critical task is to assess how each relevant tax system treats the facts before assuming that a change of address has changed the underlying obligations. 

Why Does a New Home Not Automatically End the Old Residence? 

Residence for immigration purposes grants the right to live somewhere; tax residence determines how a jurisdiction may tax a person’s income and, in some systems, other assets or gains. The tests are not interchangeable. Buying a property overseas or obtaining a residence card may support a relocation, but it does not necessarily extinguish tax residence in the previous country. 

Consider the United Kingdom. Under the statutory residence test, spending at least 183 days in the UK generally produces UK tax residence for the relevant tax year. But staying below that threshold does not automatically establish non-residence: accommodation, work, family and other connections can still matter under the prescribed tests. The residence analysis is annual, and split-year treatment applies only when the relevant conditions are met. 

Canada illustrates a different emphasis. Its tax authority assesses significant residential ties, including an available home, a spouse or partner, and dependants. Leaving the country and establishing ties elsewhere may be important, but neither fact automatically settles the case. A wealthy family’s departure can therefore be legitimate without having immediately terminated residence for tax purposes. 

Which Connections Matter More Than the Boarding Pass? 

The traditional image of relocation is physical: a flight, a new residence and fewer days spent in the former home country. Tax authorities can also ask a wider set of questions. Where does the family actually live? Is the former family home available for continued use? Where is the person’s professional activity concentrated? Which relationships and responsibilities remain anchored in the previous jurisdiction? 

Spain’s official residence guidance illustrates why a day count alone is insufficient. Spanish domestic law can treat a person as resident through presence exceeding 183 days during the calendar year or because the main centre of activities or economic interests is in Spain. It also contains a rebuttable presumption concerning a resident spouse and dependent minor children. The application of any treaty must be assessed separately. 

For business-owning families, the evidence can be especially complicated. A founder may move their personal residence while continuing to chair meetings, oversee management or conduct substantial work in the original country. None of these facts alone resolves every jurisdiction’s residence test. Together, however, they can weaken a narrative that the individual’s personal and economic life has moved completely. 

The relevant test is not whether the person has adopted an international lifestyle. It is whether the factual connections support the legal residence position asserted for each tax year. 

Can Two Countries Both Call Someone a Tax Resident? 

Yes. Two countries can apply their domestic rules to the same person and each conclude that the person is resident. A bilateral tax treaty may resolve the conflict for purposes covered by that treaty, but treaty relief is a separate analytical step, not a substitute for testing domestic residence in both jurisdictions. 

Many treaties draw from Article 4 of the OECD Model Tax Convention. Depending on the actual agreement, an individual deemed resident in both states may be assessed through a sequence involving a permanent home, the centre of vital interests, habitual abode, nationality and, ultimately, agreement between the relevant authorities. These are treaty criteria applied to documented circumstances, not optional preferences a taxpayer can select. 

Imagine a founder with an established family home in one country and a newly acquired apartment in another, whose children remain in the first country while substantial business activity continues there. A residence permit in the second country is relevant evidence, but it does not by itself determine the treaty outcome. The exact treaty language and surrounding facts are decisive. 

Even a successful treaty claim requires attention to scope. Bilateral income-tax treaties do not automatically eliminate every domestic filing duty, departure charge, social-security liability, inheritance exposure or subnational tax issue. The appropriate agreement, tax and year must be identified precisely. 

Why Do Passports and Tax Certificates Provide Incomplete Answers? 

Some wealthy families pursue additional nationality or residence-by-investment rights as part of mobility planning. Those rights may offer legitimate travel and residence benefits. They should nevertheless be distinguished from substantive tax residence, particularly where a person has not made a meaningful change in living arrangements. 

The OECD has warned that certain investment migration documents can be misused to misrepresent tax residence under the Common Reporting Standard. A certificate, identity document or additional passport does not necessarily establish that the original jurisdiction has lost the right to treat the holder as resident. Financial institutions may need to examine all jurisdictions of tax residence rather than accept a single asserted address. 

The United States presents an important further distinction: US citizens and resident aliens abroad generally remain subject to US reporting and taxation on worldwide income, subject to applicable exclusions, credits and treaty provisions. A move to a low-tax country does not, by itself, terminate citizenship-based US obligations. Green-card status and particular treaty positions can also require separate analysis. 

For internationally wealthy individuals, mobility documentation, tax residence, tax treaty entitlement and financial-account reporting are related issues, but they are never synonymous. 

How Can a Family Make a Relocation Defensible? 

A credible relocation begins before departure. The first task is to identify which countries may assert residence, and for which periods. That assessment should cover homes, family circumstances, work patterns, economic activity, ownership interests and any special rules linked to nationality or immigration status. Advisers in the departure and destination jurisdictions should test the same factual chronology against their respective laws. 

The second task is to preserve contemporaneous evidence. Travel records are useful, but so are records showing where a home is genuinely available, where the family is established, where work is performed and how major management decisions are made. Such documentation should reflect reality rather than an artificially tidy narrative assembled years afterward. 

A practical pre-departure review can begin with four questions: 

Departure itself may also have tax consequences. For example, Canada’s rules for emigrants may treat specified property as disposed of at fair market value when residence ends, subject to exceptions and available relief. The UK’s temporary non-residence rules can bring certain income or gains into charge when a former resident returns within the prescribed period. These are reminders that the fiscal consequences of a move can arise both when leaving and when returning. 

Finally, the assessment should be renewed when circumstances change. A second home becomes a primary home; children relocate; a founder resumes executive duties; or a temporary move becomes permanent. The tax analysis should evolve with the facts. The best defence is not an impressive collection of foreign documents, but a coherent record showing how the legal position matches the life actually being lived. 

Conclusion 

A change of country is not necessarily a change of tax residence. For wealthy families, the outcome turns on the interaction of domestic law, genuine personal and economic ties, any applicable treaty and the evidence maintained over time. The central question is not where an individual would prefer to be taxed, but which jurisdictions can lawfully claim residence and on what basis. As international mobility becomes more complex, coordinating the departure and arrival analysis before the move will be more valuable than trying to reconcile inconsistent positions afterward.

About the Author

Peter Kovacs is Director of Strategy at William Blackstone Internacional, a Panama-based private consultancy focused on cross-border strategic and institutional matters. His work addresses jurisdictional frameworks, international governance, compliance-sensitive advisory and the intersection of private international interests with public institutions. His commentary has appeared in Diplomat Magazine, The Diplomatic Insight, SuperyachtNews and UK Private Wealth Magazine.