Precisely Ballsout, IF YOU WORK AND GET PAID OUTSIDE THE UK. If you work in the UK you are subject to tax. The two agency guys that were 6 years! Gatwick based, UK home owners, claimed they were off-shore because they were paid on the IOM..No said Mr Brown, very naughty boys, pay the tax plus 100% of the tax in a fine for "tax avoidance" oh, and ps.. we still may prosecute you! nice criminal record for tax fraud/evasion just so the employer can pay you without them paying NIC .. At least Cathay will give you a calculation of UK duties and statement of tax paid to HK.. then it's up to you regarding the 90 day rule.