There is a 7 year period during which non-domicile residents in the UK can be taxed on a remittance basis (basically it excludes tax on non-UK income). After the 7 year period there is a charge of £30,000 to remain within the remittance basis. However, the charge increases if you remain in the UK for a period of 12 years to £60,000 and if you are resident for 17 years to £90,000. The pressure is on to bring non-domiciles within the worldwide tax net.