🇬🇧 COUNTRY A United Kingdom VS 🇸🇪 COUNTRY B Sweden

The UK is significantly lower. At £100,000 income, a UK resident pays approximately £27,000 in income tax + NI (basic rate + higher rate + 2% NI). A Swedish resident at the equivalent income pays approximately £40,000 equivalent (52.9% combined rate). The UK saves approximately £13,000 per year at this income level. Important caveat: UK healthcare (NHS) is funded from general taxation and NI, so the true comparison includes the value of Swedish universal dental and comprehensive social services included in Sweden's rate. For the £100,000–£125,140 range, the UK's personal allowance taper creates a 60% effective marginal rate — briefly higher than Sweden's flat 52.9%.

UK ISA and Swedish ISK are both tax-efficient wrappers but work completely differently. ISA (UK): contribute up to £20,000/year; all gains, dividends, and income inside the ISA are completely tax-free with no annual charge. ISK (Sweden): no annual contribution limit; all gains and income inside the ISK are not taxed, but the account is charged ~0.888% of the portfolio value annually (2026 rate — based on Swedish government bond yield + 1%). For a £500,000 portfolio: ISA annual tax = £0. ISK annual tax = ~£4,440. ISA wins on large established portfolios. ISK can win on smaller portfolios where UK capital gains and dividend taxes would otherwise apply above ISA limits. ISK also wins for Swedish shares specifically — holding Swedish shares outside an ISK triggers 30% CGT on disposal; ISK eliminates this.

The UK's non-domicile remittance basis regime — under which UK non-doms could exclude foreign income and gains from UK tax by not remitting them to the UK — was abolished from 6 April 2025. It is replaced by the 4-year Foreign Income and Gains (FIG) regime: new UK tax residents who have not been UK-resident in the prior 10 tax years can exempt all foreign income and gains from UK tax for their first 4 years of UK residency. After 4 years, all worldwide income and gains are subject to UK tax. Impact on UK vs Sweden: for new arrivals with significant foreign income/assets, the UK's 4-year FIG regime makes it more attractive than Sweden (which has no equivalent regime and taxes all worldwide income from day one of residency). After 4 years, the UK's headline 40%/45% rates remain lower than Sweden's 52.9%, so the UK still wins on pure rates. The key change: the indefinite remittance basis for long-term UK residents no longer exists.