When Britain's richest man left for Monaco, reports at the time put the potential UK tax saving somewhere between £400 million and £4 billion a year — a genuinely wide range, because nobody outside Jim Ratcliffe's own accountants actually knew his numbers. What isn't in dispute is the mechanism. He didn't hide anything. He stopped being a UK tax resident, using the same statutory test that applies to anyone leaving the country.

What Ratcliffe Actually Did

Sir Jim Ratcliffe, founder of the Ineos petrochemicals group, relocated from the UK to Monaco around 2019–2020. He used the UK's Statutory Residence Test (SRT), the standard framework, not a special arrangement, to establish non-residence: meeting one of the automatic non-residence tests, managing his "sufficient ties" to the UK carefully, and keeping physical presence in the country low enough to support the claim.

The complicating factor is that Ratcliffe kept substantial UK business interests. Ineos remained UK-headquartered in significant part, and running a business you still control from outside the country you've left is exactly where SRT claims get tested hardest. "Work ties" and "family ties" are two of the specific ties HMRC weighs, and someone still deeply involved in a UK company has to manage both with more care than someone who has genuinely severed every connection.

The Test Itself

Non-residence under the SRT requires either meeting an automatic non-residence test, or failing to meet an automatic residence test and then having insufficient UK ties on top of that. For someone with real UK business, employment, and family connections, "insufficient ties" is not a low bar. It generally means not spending too many days in the UK in a tax year, not carrying on UK employment or self-employment above set thresholds, not having a UK-based spouse or dependents, and not keeping UK accommodation available for substantial use.

Ratcliffe's case is the useful one precisely because it wasn't the easy version, a person with no UK ties left to sever. It was someone managing genuine complexity and still making the exit hold.

Consider a hypothetical version of the same problem at ordinary scale: a UK-based founder who sells a controlling stake in their company but stays on the board, keeps a UK office, and visits four or five times a year for meetings. On paper, that's exactly the "work ties plus UK presence" combination that trips up an SRT claim. The fix isn't avoiding the UK entirely — it's counting days carefully, formalising the board role so it doesn't read as UK employment, and making sure family and housing ties are actually severed, not just quieter than before. Get that wrong and HMRC has a straightforward case that residence never really ended.

Why This Matters More in 2026 Than It Did in 2020

Ratcliffe left before the UK scrapped non-dom status in 2025. Before that reform, a wealthy non-dom could stay UK resident and claim the remittance basis on foreign income, no need to leave at all. That option is now largely gone. The practical result is that far more UK HNW individuals are weighing outright emigration rather than a comfortable non-dom claim, which makes Ratcliffe's playbook, not his wealth, considerably more relevant than it was when he used it.

• Monaco
  What draws people there: No personal income tax, EU-adjacent, Ratcliffe's own choice

• UAE (Dubai especially)
  What draws people there: 0% personal tax, established expat infrastructure

• Switzerland
  What draws people there: Lump-sum taxation available in favourable cantons

• Italy
  What draws people there: Flat annual tax on foreign income (raised to €300,000 for new residents from 2026; €200,000 grandfathered for those already resident)

• Portugal
  What draws people there: EU access, though tax appeal narrowed since NHR closed

• Greece
  What draws people there: €100,000 non-dom flat-tax regime

• Cyprus / Malta
  What draws people there: Non-dom regimes plus EU access

Split-year treatment also matters for anyone leaving mid-tax-year: in the right circumstances, the year of departure can be split into a UK-resident part and a non-resident part, rather than the whole year being taxed as if the person had been UK resident throughout. And even a clean exit doesn't end UK exposure immediately — temporary non-residence rules keep certain kinds of income, like capital gains realised shortly before leaving, "sticky" to the UK for five years if the person returns within that window.

For Those Not Ready to Leave

The UK hasn't left emigrating HNW residents with nothing. The new FIG regime offers four years of exemption for genuinely new UK residents, narrow in who qualifies, but real. Trust and gifting strategies still work under the post-2025 rules, within tighter limits. Business Property Relief planning remains available. And anyone weighing departure should remember UK deemed domicile can persist for inheritance tax purposes for years after residency itself ends, regardless of where someone is living by then.

Leaving Properly, at Any Scale

Ratcliffe's exit worked because it was managed as a genuine, evidenced departure rather than an address change on a form: day counts tracked, ties actually reduced, the business relationship restructured around his new status instead of pretended away. That discipline matters just as much whether the UK income being left behind is nine figures or a comfortable six.

If you're weighing a UK exit under the current rules, particularly if you're leaving while UK business interests stay behind, bring us your day-count history and your remaining UK ties. We'll map what a defensible departure actually looks like for your situation before you make any irreversible moves.

This is general information, not a substitute for advice from a UK-qualified tax adviser on your personal residency position.