🇬🇧 COUNTRY A UK VS 🇨🇭 COUNTRY B Switzerland

The UK vs Switzerland comparison isn't close: even at lower-middle incomes, Zurich beats the UK on combined income tax and social security, and Zug beats it by a wide margin. At €40,000 (~£34,300), Zurich's combined income tax and AHV/ALV social security (~£4,000) is already below the UK's income tax and National Insurance (£6,084) — Zurich saves ~£2,080/year, and Zug saves ~£3,360. The gap widens steadily as income rises, driven mainly by the UK's steep 40%/45% rate structure and its 60% marginal-rate trap. Between £100,000 and £125,140, the UK withdraws the £12,570 personal allowance at £1 for every £2 earned, on top of the 40% higher rate — creating a 60% effective marginal income tax rate in that band, with no equivalent in Switzerland's cantonal system. By £128,800 (~€150,000, just past the trap zone), the UK takes £48,750 versus Zurich's £28,780 (Zurich saves £19,970) and Zug's £19,250 (Zug saves £29,500). At £171,700 (~€200,000), Zurich saves £24,670 and Zug saves £38,410. Switzerland's social security is genuinely uncapped, not the CHF 88,200-capped system sometimes claimed: AHV/IV/EO (5.3%) applies to 100% of gross salary with no earnings ceiling at all; only ALV's 1.1% base rate caps, at CHF 148,200, with a 0.5% solidarity surcharge continuing uncapped above that. Combined Swiss employee SS runs to roughly 6.4% for most earners — somewhat higher than the UK's average effective NI rate at typical incomes (UK NI has a tax-free threshold and drops to 2% above £50,270), though this SS gap is far smaller than the income-tax gap between the two countries. Canton choice matters enormously: Zug's 2026 maximum marginal income tax rate (21.90%, KPMG) is roughly half Geneva's (43.24%), with Zurich around 39.10% maximum marginal — though what people actually pay is much lower than these ceiling rates: Zurich's effective combined rate (income tax + SS) is ~18.25% at CHF 100,000, and Zug's is ~11.72%. Capital gains are a clear Swiss advantage — 0% CGT for private investors on shares, ETFs, bonds and property, versus the UK's 18%/24% with just a £3,000 annual exempt amount. Switzerland does levy an annual cantonal wealth tax the UK doesn't have: 2026 maximum marginal rates run from 0.13% (Nidwalden) to 0.86% (Geneva) — Zurich 0.64%, Zug 0.22% — which partly offsets the income tax saving for higher-net-worth movers. Factor in Switzerland's mandatory private health insurance (CHF 3,000-8,000+/year per adult, versus the UK's free-at-point-of-use NHS) and its notably higher cost of living, and the after-tax comparison narrows somewhat at lower incomes — but Switzerland comes out ahead across the entire income range checked here, and decisively so for high earners.