Change how the wealthy are taxed and some of them leave - taking their property decisions with them. The abolition of the UK’s non-dom regime in April 2025 prompted long-resident non-doms to relocate, and the clearest early casualty was the ultra-prime London market. The owners exiting often hold through overseas and UK companies - exactly the structures GalimAI maps. This study reads the change from that proprietary view.
What GalimAI’s own data reveals
A tax-driven exit only becomes intelligence when you can attach it to property. GalimAI maps the 463,022 property-owning companies and more than 1,000,000 owners across England and Wales - including the overseas-owned and company-held prime stock that non-doms typically hold - each linked to its beneficial owners, what it holds and the signals around it.
That is the unique lens. Public records show a high-value title; GalimAI connects it to the company and the people behind it, sitting it alongside the offshore layer surfaced by the Register of Overseas Entities and the buyers active in the same market in our recently-active-buyers data. A departing non-dom’s holding company, and the funded buyer most likely to acquire the property, are both named rather than anonymous.
For an investor or counterparty that is the edge: the prime and overseas-held property most likely to come to market as owners leave - long the hardest ownership to trace - is mapped to named owners in GalimAI, so a holder can be identified and approached directly.
What changed: the end of the remittance basis
From 6 April 2025 the UK abolished the non-domiciled tax regime, replacing the remittance basis with a residence-based system. Long-term residents now face UK income tax up to 45% and capital gains tax up to 24%, and those resident for 10 of the last 20 years face inheritance tax on worldwide assets - a liability that can persist for years after leaving.
A transitional four-year FIG (foreign income and gains) regime softens the blow for new arrivals, but for established non-doms the maths changed sharply - and many chose to relocate to lower-tax centres such as Dubai and Singapore.
The public backdrop
The early public signal is in the prime market: the Treasury recorded around a £401 million fall in stamp-duty receipts, driven largely by a decline in ultra-prime transactions over £5 million. That is the macro footprint of the exodus; GalimAI’s map shows which owners and companies sit behind the high-value stock.
The most plausible mechanism
Removing the remittance basis raised the UK tax cost of being a long-term non-dom, prompting relocation; departing owners list or restructure their UK property, with the effect concentrated at the very top of the market where non-dom ownership clusters. We present this as a strong correlation with a clear mechanism, not proof that the reform alone explains any single sale - global wealth flows and interest rates press on the same market.
Sources
The proprietary figures in this study (the 463,022 companies, 1,000,000+ owners and the distress signals) are GalimAI first-party data. The public background figures are drawn from:
- BDO - abolishing non-dom status: what happens now?
- HaysMac - abolition of the UK non-dom regime from April 2025
Frequently asked questions
What does GalimAI's own data add here?
It names the prime and overseas owners. GalimAI maps 463,022 property companies and 1M+ owners - including the overseas-owned and company-held prime stock non-doms hold - each linked to beneficial owners, so the property likely to come to market as they leave is visible rather than anonymous.
What changed with non-dom status?
From 6 April 2025 the UK abolished the non-dom regime, replacing the remittance basis with a residence-based system. Long-term residents face UK income tax up to 45%, CGT up to 24%, and inheritance tax on worldwide assets after 10 of 20 years of residence.
Did it affect the property market?
The Treasury recorded around a 401 million pound fall in stamp-duty receipts, driven by fewer ultra-prime sales over 5 million pounds, as non-doms relocated abroad - a strong correlation with a clear mechanism, not single-cause proof.
How can investors use this?
The prime and overseas-held property most likely to come to market is mapped to named owners in GalimAI, so a holder can be identified and approached directly.