The United Kingdom is experiencing a record-breaking exodus of wealthy individuals in 2025, with an estimated 16,500 millionaires expected to leave the country, the highest number recorded globally in a single year. This outflow is attributed to recent tax policy changes, including a non-domiciled tax shake-up and proposed wealth tax discussions, as well as economic instability and the ongoing effects of Brexit. Analysts and studies, including projections from Henley and reports from Forbes, highlight that £66 billion in assets are anticipated to be transferred abroad as millionaires seek residency elsewhere. The departure of high-net-worth individuals is raising concerns about the impact on investment and tax revenue in the UK. Additionally, lawmakers have criticized the UK tax authority, HM Revenue & Customs (HMRC), for being unable to determine how much tax billionaires pay on their wealth. This situation has sparked debate over the government's approach to taxation and its effects on the country's attractiveness to wealthy investors.