Isle of Man

The cheapest of the Crown Dependencies to join: no housing controls, no minimum property price, and British citizens can simply move there. Income tax tops out at 21%, total income tax can be capped at £220,000 a year, and there is no capital gains tax or inheritance tax. The catches: VAT at 20% and National Insurance much like the UK's, and the cap only pays off once your income is above roughly £1 million.