What the UK stops taxing, and what it keeps
Leave UK residence cleanly under the Statutory Residence Test and your Omani salary, foreign investment income and most overseas gains fall outside UK tax. What stays behind is UK-source income: rent from UK property under the Non-Resident Landlord Scheme, gains on UK residential property reportable within 60 days of completion at 18% or 24%, and some UK pensions. The UK and Oman have had a double taxation agreement in force since 1998, so relief is available where both countries have a claim, but the treatment of each item needs checking rather than assuming. In your departure year, split-year treatment can tax you as UK resident only up to the day you leave, provided you meet a qualifying case.
Oman is tax-free today, not permanently
As at 2026 Oman levies no personal income tax, no capital gains tax and no inheritance tax on individuals, with 5% VAT the main charge you will notice. The change to plan for is Royal Decree No. 56/2025: a flat 5% personal income tax from 1 January 2028 on worldwide income above OMR 42,000 a year for Omani tax residents (Oman-source income only for non-residents). The threshold is deliberately high, so around 99% of residents are expected to be unaffected, but higher earners should factor it into long-term planning rather than treat Oman as permanently tax-free. Oman treats you as tax resident once your presence exceeds 183 days in a tax year.
The five-year trap and your pension
Realising gains while non-resident is only genuinely UK-tax-free if you stay away long enough. Under the temporary non-residence rules, returning within roughly five years, having been UK resident in at least four of the seven tax years before leaving, pulls certain gains, distributions and pension amounts back into UK tax in your year of return. On pensions, there are effectively no recognised overseas schemes in the Gulf to transfer into, and a transfer can trigger the 25% overseas transfer charge, so the sensible default is to leave UK pensions where they are and draw them under the UK rules and the treaty. Horizon plans the UK side of an Oman move to a fixed fee agreed upfront, with non-resident returns from £550; book a free clarity call at /book.
