Somewhere in Mayfair, a removal van is probably idling outside a townhouse right now, and depending on which set of statistics you believe, that’s either a long-overdue correction to a two-century-old loophole for the super-rich, or the opening scene of a slow-motion economic own goal. This is one of the more genuinely contested debates in British tax policy at the moment, so I want to lay out both sides properly before telling you where I land, because I think both sides have real evidence behind them, and the honest answer is “it’s too early to know for certain, but the early data isn’t great.”
What Actually Changed
The “non-dom” regime allowed UK residents whose permanent home was legally considered to be overseas to pay UK tax only on their UK income and gains, while foreign income and gains went untaxed unless brought (“remitted”) into the UK, for up to 15 years. It’s been around, in various forms, for roughly 200 years. As of the 2022/23 tax year, around 74,000 people used this status, generating roughly £8.9 billion in UK tax revenue.
From 6 April 2025, the regime was abolished and replaced with a residence-based system: new arrivals get four years of relief on foreign income and gains, after which they’re taxed the same as everyone else. Crucially, the changes also brought worldwide assets, including those held in trusts, into the scope of UK inheritance tax for anyone who’s been resident for more than ten years. The original 2024 estimate, from the previous government, suggested this could raise around £2.6 billion a year.
The Case That It’s Working as Intended
There’s a genuinely strong fairness argument underpinning all of this, and it would be dishonest not to give it its due. Research from Warwick’s CAGE research centre, looking at the 2017 reforms (which removed the remittance basis for UK-born non-doms and long-stayers), found that those changes produced a substantial tax increase from a ected individuals without triggering the mass departure that critics predicted at the time. The same researchers estimated that further reform along these lines could raise over £3.2 billion a year in additional revenue, and pointed out that around a third of non-doms sit in the UK’s top 0.1% by both income and wealth. The basic argument is: these are, overwhelmingly, very wealthy people benefiting from a remarkably generous historical quirk, most of them aren’t actually going anywhere because the UK oers plenty else (London, schools, time zone, language, rule of law), and the revenue gain is real and meaningful.
It’s also worth saying plainly: a tax system where someone earning £40,000 in Peterborough pays tax on their full income while someone living three streets away in Kensington, with substantial overseas wealth, pays nothing on that wealth purely because of where they were born, was never going to be an easy thing to defend indefinitely, regardless of which party was in o ce. The 2024 reform, remember, was originally announced by a Conservative chancellor, not a Labour one. This wasn’t purely a left-right argument to begin with.
The Case That It Isn’t
And yet. The data that’s emerged since the change came into force isn’t comfortable reading for anyone hoping the CAGE researchers’ optimism would hold. Henley & Partners, which tracks high-net-worth migration globally, estimated that the UK lost a net 10,800 millionaires in 2025, a 157% increase on 2023, including 78 “centi-millionaires” (£100 million-plus) and 12 billionaires, second only to China in absolute terms. London slipped from 5th to 6th place in the same firm’s ranking of cities by millionaire population, and is now one of only two cities in the ranking with a net loss of millionaires over the past decade, the other being Moscow, which is not the kind of company a global financial centre wants to find itself in. The Sunday Times Rich List recorded its sharpest annual fall in the number of UK billionaires on record.
Individual examples have been making the rounds too: Frederic de Mevius, an heir to the AB InBev brewing fortune who’d been based in Kensington and Chelsea for years, reportedly shifted his residency back to Belgium around the time these changes took e ect. One tax and migration adviser described a client’s reaction to being walked through the new rules as essentially “London is nice, but it isn’t that nice.” None of this proves causation on its own, people move for all sorts of reasons, but the direction and scale of the shift is hard to wave away entirely, and it’s notable that the government itself has since been reported to be considering softening elements of the regime, including a more generous “temporary repatriation facility” for money brought into the UK, specifically in response to these concerns. Governments don’t usually row back on flagship revenue measures purely for fun.
Where I Land
My honest view is that both camps are looking at real evidence and talking past each other slightly. The CAGE research is a careful empirical study of a smaller, earlier reform, and it’s genuinely useful evidence that not every non-dom is a flight risk. But “the 2017 reform didn’t cause a mass exodus” and “a much larger 2025 reform, which adds worldwide IHT exposure on top of everything else, at a moment when several other countries have spent the last few years actively rolling out the red carpet for exactly this demographic (Italy’s flat tax regime, the UAE’s zero income tax, Switzerland’s longstanding arrangements), won’t either” are di erent claims, and I think the second one was always more optimistic than the first one’s evidence really supported.
There’s also a La er-curve-shaped point buried in here that I think gets lost in the shouting: the people a ected by this are, by definition, among the most internationally mobile humans on the planet. They have lawyers whose entire job is finding the optimal jurisdiction, multiple passports or residency options already in many cases, and, frankly, less attachment to any specific postcode than someone with a mortgage, kids in the local school, and a job they can’t simply relocate. For the average reader of this series, none of the marginal tax changes we’ve discussed (frozen thresholds, the 60% trap, IHT freezes) realistically result in “I shall now relocate to Lugano.” For this specific group, that calculation is genuinely live, and has, for at least some of them, apparently been made.
The Competition Didn’t Stand Still Either
One more factor that I think gets underweighted in the UK-centric version of this debate: this isn’t happening in a vacuum. While Britain was tightening its rules, several other countries were actively loosening theirs, specifically to attract this exact demographic. Italy’s flat tax regime for new residents, Greece’s and Portugal’s various golden visa and tax incentive schemes, the UAE’s combination of zero income tax and an increasingly cosmopolitan lifestyle oering, and Switzerland’s long-established lump-sum taxation arrangements for wealthy foreigners have all been marketed, more or less explicitly, as “come here instead of London.” A tax change that might have had a modest e ect in isolation can have a much larger e ect when half a dozen competitor jurisdictions are simultaneously running the opposite playbook. Whether that’s a reason to keep the old regime is a separate question, but it’s a reason to expect the elasticity of this group’s behaviour to be higher now than it might have been twenty years ago, when London had fewer obvious rivals for this kind of resident.
What This Actually Means for You
If you’re not a centi-millionaire (and statistically, you’re almost certainly not), the direct e ect of any of this on your personal finances is close to zero. You were never going to benefit from the non-dom regime, and you’re not going to be subject to the new IHT rules on worldwide trusts either.
But there’s an indirect e ect worth flagging, and it loops back to where this series keeps ending up. A meaningful exodus of very wealthy individuals a ects demand for certain UK assets, prime London property most obviously, but also, at the margin, demand for UK-listed companies, UK gilts, and sterling itself, all of which matter for everyone, not just the wealthy. If the broader story here is “Britain has become a less predictable, more frequently-revised tax jurisdiction,” that’s arguably a bigger issue than the non-dom rules specifically, because it’s exactly the kind of uncertainty that makes any investor, foreign or domestic, demand a higher return for holding UK assets, which is, not coincidentally, one of several reasons gilt yields are where they are. Whichever side of this debate you’re on, “we kept changing the rules and nobody could plan more than eighteen months ahead” is not a great pitch to anyone deciding where to put their money, wealthy or otherwise.
This article is a personal opinion piece for general information and does not constitute financial advice. Pension transfers, particularly from defined benefit schemes, should not be undertaken without regulated financial advice, and UK rules require this for transfers above £30,000. If you’re unsure about your own pension arrangements, speak to a qualified financial adviser or use the government’s free Pension Wise service.