The End of the UK Non-Dom — and Why HNWIs Are Leaving

Britain spent the better part of two centuries offering the world's wealthy a simple deal: live in London, pay UK tax on your UK income, and keep the rest of your global wealth outside the net. The remittance basis had roots going back to 1799. It survived world wars, market crashes and every change of government — until 6 April 2025. I've spent the years since 2020 helping families leave high-tax countries for the Caribbean — I left one myself — and no single piece of tax legislation has moved as many wealthy families, as quickly, as this one.

The short answer

The UK abolished the non-dom regime from 6 April 2025 under the Finance Act 2025, replacing the remittance basis with a four-year exemption available only to new arrivals who spent the previous ten years outside the UK. The change that actually emptied the departure lounges is inheritance tax: it is now residence-based, so anyone resident for 10 of the last 20 tax years has their worldwide estate inside the UK's 40% IHT net — and a "tail" of three to ten years follows them after they leave. The scale of the exodus is genuinely contested; the direction is not. Departing British HNWIs are choosing the UAE, Italy's flat tax — and, for families who want English-speaking, common-law, low- or zero-tax jurisdictions, the Caribbean: the Cayman Islands, The Bahamas, Anguilla and Barbados. None of these moves switches off the IHT tail on day one — and none of them does anything at all for your income tax until you have properly broken UK residence under the Statutory Residence Test.

What actually happened to the UK non-dom regime?

Under the old rules, a UK resident who was domiciled abroad could claim the remittance basis: full UK tax on UK income and gains, but foreign income and gains stayed outside the net unless brought into the country. In its final form the privilege wasn't free — £30,000 a year once you'd been resident 7 of the previous 9 tax years, £60,000 once resident 12 of the last 14.

It's worth killing one myth early: non-doms did not "pay no tax." In 2023-24, the regime's final year, HMRC counted 73,700 non-domiciled taxpayers (a figure that includes non-residents) plus 9,300 deemed-domiciled taxpayers — together paying £12.5 billion in income tax, capital gains tax and National Insurance.

The abolition was a rare two-party project. Conservative Chancellor Jeremy Hunt announced it at the Spring Budget on 6 March 2024; Labour's Rachel Reeves confirmed and extended it at the Autumn Budget on 30 October 2024; and the Finance Act 2025 — Royal Assent 20 March 2025 — made it law from 6 April 2025. What replaced it is the Foreign Income and Gains (FIG) regime:

• Four years, new arrivals only. Foreign income and gains are exempt for your first four tax years of UK residence — but only if you were non-UK-resident for the previous ten consecutive years. Long-standing non-doms got nothing.
• Free remittances during the window, unlike the old system.
• Then the full net. From year five, worldwide income and gains are taxed on the arising basis, like any lifelong resident.
• A discounted exit ramp for old money. The Temporary Repatriation Facility lets former remittance-basis users bring pre-April 2025 offshore funds onshore at 12% in 2025-26 and 2026-27, rising to 15% in 2027-28 — projected by the OBR to raise £4.4 billion, £9.2 billion and £2.5 billion across those three years.
• Trust protections removed. From 6 April 2025, income and gains in settlor-interested offshore trusts are taxed on UK-resident settlors as they arise, unless the settlor is inside the FIG window. For families who built structures around the old rules over decades, that one line rewired everything.

The inheritance-tax tail: the rule that actually moved people

Ask advisers which provision drove the departures, and the answer is rarely income tax. From 6 April 2025, IHT stopped turning on domicile and started turning on residence: spend 10 of the previous 20 tax years in the UK and you are a "long-term UK resident" whose worldwide estate sits inside the UK's 40% inheritance-tax net.

Here is the part most coverage still gets wrong: leaving does not switch it off. A long-term resident who departs stays inside worldwide IHT for up to ten tax years afterwards, on a sliding scale — 10 to 13 years of prior residence means a 3-year tail, 14 years means 4, 15 means 5, scaling up to the full 10-year tail after 20 years of residence. Die in year two of your new life in Dubai or Grand Cayman, and HMRC still taxes your worldwide estate at 40%.

There are transitional carve-outs — anyone non-resident in 2025-26 who wasn't UK-domiciled on 30 October 2024 stays under the old test, and those who were deemed domiciled on that date get a shortened 3-year tail — and the clock fully resets after ten consecutive years of non-residence. But for a family two decades into London life, the arithmetic is brutal: stay, and the global estate is exposed indefinitely; leave now, and still carry up to a decade of exposure.

When I left Canada, the CRA handed me a departure tax — one painful bill, and then it was done. The UK chose the opposite design: no exit bill, but a shadow that follows your estate for up to ten years. You can price an exit tax. You cannot price dying in the wrong year.

And despite a year of press speculation, Reeves did not U-turn. The Autumn Budget of 26 November 2025 softened only the trust side — a £5 million cap per ten-year cycle on charges for trusts settled before 30 October 2024, which by Macfarlanes' math only bites at roughly £83 million and up. The personal tail survived intact.

I've had more than one of these conversations with UK families who assumed a move abroad would switch off their inheritance-tax exposure the moment they left — it doesn't, and resetting that expectation early is usually the most valuable part of the planning conversation.

Is the millionaire exodus real?

My honest answer: the direction is real, but I won't repeat the headline number as fact.

The figure everyone knows — 16,500 millionaires leaving the UK in 2025, taking an estimated $91.8 billion — comes from Henley & Partners' June 2025 wealth-migration report, which called it the largest net outflow the firm had ever recorded for any country. But it was a forecast, not a count, and the methodology is under formal challenge — Tax Policy Associates' July 2025 forensic review concluded the reports should be treated as marketing material pending independent audit, and Henley's own 2026 edition dropped flow forecasts entirely, reclassifying the UK as a Competitive Jurisdiction Under Pressure. Pointing the other way, the Financial Times reported in August 2025 that preliminary HMRC payroll data showed departures in line with, or below, official forecasts. The definitive picture only arrives with the 2025-26 self-assessment returns, filed by 31 January 2027.

But the government's own arithmetic is not in dispute. The OBR's costing assumed a 12% first-year drop among non-doms without trust structures — and 25% among non-doms with trusts and the deemed-domiciled. The official forecast itself baked in one in four of the wealthiest cohort leaving, while still projecting £33.8 billion of revenue over five years — a yield the OBR grades as highly uncertain. CEBR modelling suggests that if 25% of remittance-basis non-doms leave, the Treasury's net gain is roughly zero; at 50%, the first-year loss reaches £2.4 billion.

The anecdotal ledger points the same way. The Sunday Times Rich List 2025 counted 156 UK billionaires, down from 165 — the sharpest drop since the list began in 1989. Nassef Sawiris registered as living in Italy from April 2025, per Bloomberg. Goldman Sachs vice-chairman Richard Gnodde relocated to Milan. Shipping billionaire John Fredriksen closed his London office, listed his Chelsea mansion at a reported £250 million, moved operations to the UAE, and told an interviewer that "Britain has gone to hell." Lakshmi Mittal is reported to have left for Switzerland and Dubai after roughly three decades in London.

Where departing British HNWIs actually go

The two heavyweight destinations are the Gulf and southern Europe.

The UAE is the world's top wealth-migration destination — Henley projected a record net inflow of 9,800 millionaires in 2025, with the same methodological caveats as above — offering zero personal income tax, no capital gains tax, no inheritance tax, and a Golden Visa granting five-to-ten-year residency. For founders with Gulf operations, it works. For a British family that wants sea air, a garden and a village school, Dubai is a harder sell.

Italy built the closest thing to a non-dom successor: a flat tax on foreign income for new residents, doubled from €100,000 to €200,000 a year in August 2024 and available for up to fifteen years — with the 2026 Budget Law reported to raise it again to €300,000 for new entrants. This is the regime that attracted Gnodde and Sawiris.

And then there is the option I know best — the one I chose myself.

The Caribbean options for a departing Brit

First, a point that saves people money: British citizens do not need a second passport to relocate to the Caribbean. A residency permit does the job. Citizenship by investment — in St. Kitts & Nevis, Antigua & Barbuda and elsewhere — is a separate decision about mobility, optionality and family legacy, not a requirement for the move. For most departing Brits, the real menu is residency by investment:

• The Bahamas. The Economic Certificate of Permanent Residence now requires a minimum BSD 1,000,000 (roughly US$1M) — up from BSD 750,000 as of 1 January 2025 — invested in real estate or Central Bank zero-coupon bonds, with a new ten-year minimum holding period. No income, capital gains or inheritance tax.
• Cayman Islands. The Residency Certificate for Persons of Independent Means runs 25 years, renewable: CI$1M (about US$1.22M) invested in Grand Cayman, at least CI$500,000 (about US$610,000) of it in developed real estate, plus annual income of CI$120,000 or a CI$400,000 local deposit. The Certificate of Permanent Residence requires CI$2M (about US$2.4M) in developed real estate; since Cayman's 1 May 2026 immigration reform it is not a lifetime grant but runs an initial ten years, with an application in year nine for an indefinite Certificate. No direct taxation, and the deepest financial-services infrastructure in the region.
• Anguilla. A British Overseas Territory with no income, capital gains or inheritance tax. Residency by investment runs through US$750,000 in real estate (covering a family of four, plus US$100,000 per additional dependant) or a US$150,000 contribution to the Capital Development Fund, with no minimum-stay requirement. A separate High Value Resident program grants tax residency at 45 days a year on-island, for a fixed annual lump-sum payment — the figure is revised from time to time, so confirm the current number before you commit.
• Barbados. The Special Entry and Reside Permit's Category 1 grants indefinite residence for US$2M invested from foreign funds plus certified net worth above US$5M; property owners aged 60-plus with a Barbados home worth US$300,000 or more qualify for an indefinite Category 2 permit. Be clear-eyed: Barbados is not a zero-tax jurisdiction. Its draw is lifestyle, connectivity and, for some structures, its treaty network — and its real estate market is the region's most established.

Now the fine print that half the "move to a tax haven" articles skip: none of this ends the IHT tail on day one. Your tail was fixed by your years of UK residence, follows you to Dubai, Milan or Grand Cayman alike, and only resets after ten consecutive years of non-residence. Relocation solves the income-tax question quickly; the estate question is a decade-long project that belongs with your UK counsel. What I bring is the other half: a base where the tax residency is real — properly established and documented, in a territorial or zero-tax system — and where your family will actually stay long enough for the clock to run.

It's a pattern I've watched play out more than once: families shortlist Dubai on paper, then choose a Caribbean base instead once they've actually visited both.

Breaking UK residence is the step that does the work

Here is where otherwise good plans quietly unravel. A family buys the house, files the residency application and tells everyone they've left — while keeping enough of a London life that HMRC never agrees they went. Your Caribbean tax status is irrelevant until you have stopped being UK tax-resident. The UK settles that question with the Statutory Residence Test: a framework of day counts and ties, not a matter of intent. A residency permit abroad doesn't decide it, and neither does a second passport you don't live behind.

The cleanest exit is an automatic overseas test. Broadly, if you were UK-resident in any of the previous three tax years, spending fewer than 16 days in the UK in a tax year makes you automatically non-resident; full-time work abroad opens a more generous door. Fall short of that and you are into the sufficient ties test, where your permitted days narrow with every tie you keep — the house you didn't let out, the board seat, the children still at a UK school. The more of London you hold on to, the fewer nights you can safely spend in it.

Two points I make almost every time:

• The FIG regime is not a leaver's tool. It relieves foreign income and gains for people arriving in the UK after a decade away. On the way out it does nothing for you; the clean residence break is the whole mechanism.
• A mixed UK/US household has two problems, not one. The United States taxes its citizens on worldwide income wherever they live, so an American spouse or child doesn't come off the US net by moving. That side needs its own advice, run in parallel.

The fit for a British family — and the honest trade-offs

For a British household the landing is softer than most alternatives, and it's worth being specific about why:

• Direct flights. British Airways and Virgin Atlantic fly London non-stop to Barbados (around ten hours) and Antigua (around nine), with direct service also to St. Lucia, Grenada, Tobago and The Bahamas. A board meeting or a grandparent's birthday is a one-flight trip, not an expedition — I've mapped which islands are actually a direct flight home.
• A time zone that works. The Eastern Caribbean runs four to five hours behind London. You can take a City call before lunch and still have the afternoon. Neither the Gulf nor Asia gives you that overlap.
• English and common law. These are former British territories: English-speaking, common-law, driving on the left. Contracts, courts and conveyancing feel familiar in a way Dubai's do not.
• An established community. Barbados, Cayman and St Kitts & Nevis all have long-settled British and diaspora populations. You won't be the first family to arrive with exactly this problem.

And now the parts that don't make the brochure:

• No income tax is not no cost. Stamp duty on purchase, import duty on nearly everything that arrives by container, and a cost of living that startles people who priced the move off the tax table alone. If the plan leans on rental income to carry the house, read why Caribbean rental cashflow is harder than it looks first.
• Healthcare has a ceiling. Routine and emergency care is perfectly good; complex specialist medicine usually means a flight to Miami, New York or back to London. Budget for first-rate international cover, and be honest with yourself if anyone in the family has ongoing needs — my read on healthcare in the region is deliberately unromantic.
• The school bench is shorter. British-curriculum and international schools exist, but the choice is narrower than London's, and moving a child mid-education is a planning item, not a footnote.
• You are giving up London. The theatre, the network, the two-hour hop to Europe. An island is smaller, slower and further from everything — precisely the appeal for some families, and a year-one regret for others.

None of these is disqualifying on its own. Together they're why I tell families to rent through a season before committing capital, and to see the island in September as well as in January.

How I'd think it through

Having guided 100-plus families through citizenship and residency decisions in 2025 alone, my framework for departing Brits is short:

1. Count your years first. Your prior UK residence sets your tail at three to ten years, and that number shapes everything from insurance during the tail to gifting strategy. Get UK advice before you book flights.
2. Separate the two clocks. Income-tax relief arrives the tax year you properly leave. IHT relief arrives up to a decade later. Families who conflate the two make rushed, expensive decisions.
3. Choose the base you'll actually live in. The families who stay offshore chose lifestyle first and tax second. Compare the options — I keep a comparison of every program here — and visit before you commit.

If you're weighing a UK exit against the Caribbean options, my advisory practice works alongside your UK tax counsel on the destination side — book a call and I'll tell you frankly which islands fit.

Key takeaways

• The UK non-dom regime ended 6 April 2025 under the Finance Act 2025, replaced by a four-year FIG window for new arrivals only.
• Inheritance tax is now residence-based: 10 of the last 20 tax years in the UK puts your worldwide estate in the 40% net, with a 3-10-year tail after you leave.
• The famous 16,500-millionaire exodus figure is a contested forecast — but the OBR's own costing assumed a quarter of the wealthiest non-dom cohort would leave.
• Departing British wealth is heading to the UAE, Italy's flat tax and Switzerland — and to Caribbean bases like Cayman, The Bahamas, Anguilla and Barbados.
• Brits need residency, not a new passport, to relocate — and no destination switches off the IHT tail on day one.
• Nothing abroad helps your income tax until you break UK residence under the Statutory Residence Test: fewer than 16 UK days a year is the clean automatic exit, and every London tie you keep tightens the count.
• The British fit is genuine — direct flights, a four-to-five-hour time difference, English common law — but healthcare depth, school choice and the cost of importing everything are real constraints.

Frequently asked questions

Does leaving the UK end my inheritance-tax exposure? No — not immediately. A tail of three to ten years, set by your length of prior UK residence, keeps your worldwide estate inside the 40% IHT net after departure. Exposure only fully resets after ten consecutive years of non-residence.

What replaced the non-dom regime? The Foreign Income and Gains (FIG) regime: foreign income and gains are exempt for your first four tax years of UK residence, but only if you were non-resident for the previous ten consecutive years. From year five, worldwide taxation applies on the arising basis.

How many days can I still spend in the UK after I leave? It depends on your residence history and your ties. If you were UK-resident in any of the previous three tax years, spending fewer than 16 UK days in a tax year makes you automatically non-resident; above that you're into the sufficient ties test, where the allowance narrows as you keep more of your London life — an un-let house, a board seat, children at a UK school. Have a UK adviser map your day count before you book flights.

Did 16,500 millionaires really leave the UK in 2025? That figure was a Henley & Partners forecast, not a count, and its methodology is under formal challenge — Henley dropped flow forecasts in its 2026 report. Preliminary HMRC payroll data suggested departures in line with or below official forecasts; definitive numbers arrive with the 2025-26 returns in January 2027.

Do British citizens need citizenship by investment to move to the Caribbean? No. Residency programs in The Bahamas, Cayman, Anguilla and Barbados grant the right to live there without a new passport; citizenship by investment is a separate mobility decision — useful for some, unnecessary for a straightforward relocation.

Does buying a Caribbean home or taking residency there cut my UK tax bill by itself? No. UK tax follows UK residence, not where you own property. Until you have ceased to be UK tax-resident under the Statutory Residence Test, a house in Grand Cayman or Barbados changes nothing about your UK liability — and a passport you don't live behind changes nothing either.

Which Caribbean jurisdictions charge no income tax? The Cayman Islands, The Bahamas and Anguilla levy no personal income, capital gains or inheritance tax. Barbados is not a zero-tax jurisdiction — its appeal is lifestyle, connectivity and its treaty network.