London’s Super-Rich Are Leaving and $160 Billion of Wealth Is at Stake

London is confronting a new challenge to its status as a global destination for wealth after an analysis of the Bloomberg Billionaires Index put the combined fortune represented by ultra-rich individuals who have left or loosened their ties with Britain over the past two years at about $160 billion (£120 billion).

The figure does not mean that $160 billion in cash or investment has physically left the British economy. Rather, it represents the estimated wealth of billionaires and families tracked by Bloomberg whose links to the UK have weakened or ended. More than a dozen individuals with multibillion-pound fortunes are included in the calculation.

Among the prominent departures are steel magnate Lakshmi Mittal, Aston Villa co-owner Nassef Sawiris and telecoms investor Shravin Bharti Mittal. Hedge-fund founder Chris Rokos, who ranked among Britain's biggest individual taxpayers, has also relocated abroad. David Reuben, the property billionaire who was recently reported to have moved to Monaco, is not included in the $160 billion calculation.

The destinations vary, but the pattern is clear: Monaco, Switzerland, Italy and the United Arab Emirates have emerged as important alternatives for wealthy individuals seeking different tax and residency arrangements. Dubai in particular has become increasingly prominent as a destination for internationally mobile wealth, while Bloomberg has reported that a Saudi family investment office is shifting most of its staff from London to Dubai.

Tax policy is at the centre of the debate. From April 2025, Britain abolished the longstanding non-dom regime and replaced it with a residence-based system. Under the new rules, UK residents are generally taxed on worldwide income and gains, although qualifying new residents can receive relief on certain foreign income and gains for their first four years.

The reforms were intended to make the tax system fairer while raising additional revenue, rather than deliberately pushing wealthy residents out. The Treasury has told Parliament that the new residence-based system is expected to raise £39.5 billion by 2030-31, based on the Office for Budget Responsibility's previous costing, and said there is not firm evidence requiring that assessment to be changed.

That is why the political argument over the exodus is far from settled. Critics of the government's approach say Britain risks losing people who contribute disproportionately through income tax, capital gains, consumption, property and business activity. Supporters of the reforms argue that wealthy residents should not receive preferential treatment simply because much of their wealth or income originates overseas.

The scale of individual fortunes involved makes the debate particularly sensitive. David Lesperance, a tax and migration adviser quoted by The National, argued that losing billionaires can have a much larger fiscal and economic impact than losing ordinary millionaires because of the concentration of taxes, employment, spending and philanthropy associated with very large fortunes.

London's luxury property market is already showing some signs of the changing environment. Research cited by The National found transactions in prime central London fell by more than 32% in the year following the tax changes, while prices declined 7%. At the very top of the market, however, demand has not disappeared: properties worth more than £15 million continued to attract major buyers, including a £270 million sale of a Chelsea mansion and a £195 million sale of The Holme in Regent's Park.

That mixed picture is important. Wealthy people leaving London do not necessarily abandon the city altogether. Some retain homes, businesses, advisers and professional relationships in Britain while making another country their principal residence. Knight Frank has described the current trend as more of a thinning of demand than a wholesale exodus, noting that many wealthy owners who relocate do not immediately sell their London properties.

Nor is London's position as a financial centre collapsing. The Global Financial Centres Index continues to rank London among the world's leading financial hubs, while City of London data shows the capital maintaining strong scores for financial activity, talent, infrastructure and its wider business ecosystem. London's own 2026 economic report also says the city continues to rank first or second in major global competitiveness measures.

The concern is therefore less about an immediate collapse and more about competitiveness at the margins. As wealth becomes increasingly mobile, cities such as Dubai, Singapore, Milan, Zurich and parts of the Middle East are competing aggressively for entrepreneurs, investors, family offices and the professional services that follow them. Henley & Partners says the UK's fiscal attractiveness and policy predictability have weakened for internationally mobile wealth, even though the country retains major advantages in finance, education, institutions and global connectivity.

For London, the challenge is to balance the political demand for a tax system that raises revenue and treats taxpayers fairly with the economic reality that the world's wealthiest people can increasingly choose where they live, invest and establish family offices. The debate is becoming particularly important ahead of Britain's upcoming Budget, with further tax changes already being discussed and financial-sector leaders warning that repeated policy shifts could undermine investor confidence.

The $160 billion figure is therefore a warning signal, not a balance-sheet loss for London. The capital remains one of the world's most powerful financial centres, but the movement of some of its wealthiest residents shows that its historic advantages can no longer be taken for granted. In a global economy where capital, talent and residency can move together, London's future reputation as a place to build and preserve wealth may depend increasingly on whether Britain can offer something that goes beyond financial sophistication: a tax and policy environment wealthy investors believe will remain predictable for years to come.