Key Takeaways:
A proposed 45% capital gains tax in the UK risks accelerating an exodus of top earners as new data reveals net migration has already plunged 82% from its 2023 peak.
A sharp 82% drop in UK net migration is colliding with proposals for a 45% capital gains tax, fueling concerns that the country’s tax base is voting with its feet and imperiling future government revenue.
"We don’t want hundreds of thousands of people coming into the country. We want net emigration," Reform UK's Treasury spokesperson Robert Jenrick said, arguing for even lower migration to reduce pressure on housing and public services.
Data from the Office for National Statistics showed net migration fell to 171,000 in 2025, plummeting from a peak of 944,000 in early 2023. The fall comes as fewer Britons are repatriating, with only 110,000 returning in the last year compared to 170,000 annually after the pandemic. The debate is intensifying as Labour’s Wes Streeting has proposed aligning capital gains tax with income tax rates, which could hit 45% for those earning over £125,140.
The proposal, intended to raise £12 billion, may instead trigger the Laffer Curve, where higher tax rates lead to lower revenue. HMRC’s own modeling suggests the move could lose £7 billion as high earners depart. The number of UK billionaires has already fallen from a peak of 177 in 2022 to 157, with one-sixth of the families on the 2024 Rich List having already left.
The trend marks a shift from the stereotypical British émigré of a retiree to younger, entrepreneurial workers moving to lower-tax jurisdictions like Dubai and delaying their return. This "brain drain" removes prime tax-paying years from the UK economy, along with the investment and jobs those individuals create.
This experiment has been run before. After former Chancellor Rachel Reeves raised the capital gains rate, receipts fell from nearly £17 billion in 2022-23 to £13.1 billion in 2024-25. The pattern suggests that the most mobile segment of the tax base is highly sensitive to rate changes, and their departure could have significant long-term consequences for the UK's economic outlook.
This article is for informational purposes only and does not constitute investment advice.
