London Loses Some of Its Wealthiest Taxpayers

London is witnessing an exodus of some of its wealthiest taxpayers. According to an analysis by Bloomberg based on the Bloomberg Billionaires Index, billionaires and families who have reduced or severed their ties with the United Kingdom over the past two years represent a combined wealth of approximately $160 billion. While this figure underscores the significant stakes for London, it does not imply that $160 billion in assets have actually left the British economy.

A Symbolic Departure: Chris Rokos

Among the most emblematic departures is that of Chris Rokos, founder of the hedge fund Rokos Capital Management. The British financier is set to transfer his tax residency to Greece and plans to open an office in Athens, according to Bloomberg. His departure is particularly symbolic, as he was one of the UK’s largest individual taxpayers.

According to the Sunday Times Tax List, Rokos paid approximately £330 million in taxes for the last fiscal year covered, placing him third among British taxpayers. However, this amount should be viewed as an estimate published by the Sunday Times; individual tax data is not publicly verifiable through HMRC (Her Majesty’s Revenue and Customs). The organization TaxWatch has notably pointed out that the £330 million tax bill cannot be considered a recurring annual amount.

Why Greece?

The choice of Greece is not accidental. The country offers a regime that allows new tax residents, under certain conditions, to pay a flat fee of €100,000 per year on their foreign-sourced income for a period of up to 15 years. This scheme typically requires a minimum investment of €500,000.

The UK’s Shifting Tax Landscape

This tax competition comes at a time when the United Kingdom has fundamentally altered its own framework for international high-net-worth individuals. As of April 6, 2025, the former "non-dom" tax regime has been abolished and replaced by a residence-based system. New residents meeting specific criteria can benefit from an exemption on their foreign income and gains for their first four tax years in the UK, provided they were non-residents for the preceding ten years.

The changes also extend to inheritance tax. Since April 2025, the UK has applied new rules based on the concept of "long-term UK residence." In certain situations, overseas assets may now fall within the scope of Inheritance Tax for individuals with a sufficiently long history of residence in the UK.

Beyond the Headcount: The Real Economic Stakes

For London, the issue goes beyond the simple number of billionaires changing addresses. A wealthy individual can retain businesses, real estate, bank accounts, or investments in the UK while transferring their tax residency elsewhere. This is precisely why the $160 billion figure cited by Bloomberg should not be presented as $160 billion in capital leaving the country. The figure measures the wealth of the individuals involved, not a measured outflow of financial capital.

The true economic stake lies in what may follow a change of residency: family offices, investment teams, corporate headquarters, highly skilled jobs, local spending, and, most importantly, future investment decisions.

London’s Enduring Strengths and Emerging Risks

London, however, is far from having lost its status as a major financial hub. Its capital markets, legal system, banks, asset managers, and talent pool continue to constitute major advantages. The risk lies elsewhere: international competition has become much more credible. Greece, Italy, Switzerland, Monaco, Singapore, and the United Arab Emirates now offer high-net-worth individuals combinations of tax incentives, financial services, and quality of life that make mobility easier.

A Delicate Balancing Act

The United Kingdom thus faces a delicate trade-off. Tax reforms must ensure that the wealthiest remaining taxpayers contribute more, while preventing the most mobile from relocating their residency and, ultimately, part of their economic activity. The case of Chris Rokos perfectly illustrates this dilemma. The question is not just how much tax a billionaire pays today, but where they will decide to live, invest, manage their wealth, and develop their businesses tomorrow.

For London, this is likely where the real battle is being fought. The $160 billion has not necessarily left Britain. But the people who control a portion of this wealth can increasingly choose where it will be managed and where the next economic decisions will be made.