Your Saudi salary is only tax-free once you are non-resident
Saudi Arabia charges no personal income tax on employment income, so your gross salary is broadly your net salary. That does nothing for you while you remain UK tax resident, because the UK taxes residents on worldwide income and your Iqama does not change your status. You become non-resident by satisfying the Statutory Residence Test, applied in strict order: the automatic overseas tests, then the automatic UK tests, then the sufficient-ties test. For a full-time job in Riyadh, Jeddah or NEOM the relevant route is usually the third automatic overseas test: full-time work abroad across the tax year, working sufficient hours overseas with no significant break, fewer than 91 days in the UK and fewer than 31 UK workdays, a workday being one on which you do more than three hours of work in the UK. Meet it and you are automatically non-resident for that year. Our Saudi Arabia guide sets out the mechanics.
The departure year is where the money is lost
Most people leave part way through a tax year, and without split-year treatment the whole year can be taxed as UK resident, which brings the Saudi earnings you thought were tax-free into HMRC's reach. Split-year treatment divides the year into a UK part, taxed as resident, and an overseas part, taxed as non-resident. The common departure routes are Case 1, starting full-time work overseas, and Case 3, ceasing to have a UK home, and each carries tight limits on UK days after you go. Split-year is a relief you qualify for, not a default, and you claim it on the SA109 residence pages of the return for the year you leave. Keep a detailed record of UK days and workdays from the moment you fly. The split-year treatment guide explains each case and the date the year splits.
What stays UK-taxable, and the five-year return trap
Once non-resident, the UK taxes only UK-source income and gains on UK land. A UK rental property keeps you in the Non-Resident Landlord Scheme: apply on form NRL1 to receive rent gross, but still file a return each year with the SA109 and SA105 pages, and many British expats keep the £12,570 personal allowance to shelter modest rental profits. Sell UK residential property and Non-Resident CGT at 18% or 24% is reported and paid within 60 days of completion. The UK-Saudi treaty, in force since 2009, matters mainly for pensions and dividends rather than salary. Plan your return before you leave: if you were UK resident in 4 of the 7 tax years before departure and come back after 5 years or less, gains and certain dividends taken while abroad are taxed in the year you return, and from 6 April 2026 all close-company distributions received while temporarily non-resident can be caught. See the temporary non-residence guide.