Tax Decisions Compared

Where do UK leavers pay less tax: Portugal, Dubai or Thailand?

Answered by Jordan Onraet-Wells, Founder & Chartered Tax Adviser (CTA). Published 9 August 2026. Last reviewed 9 August 2026.

The short answer

For most UK leavers, Dubai delivers the lowest and simplest outcome: 0% personal income tax on salary, investment income and gains. Portugal now only rewards qualifying professionals through the 20% IFICI regime while taxing foreign pensions at progressive rates up to 48%, and Thailand sits in the middle, taxing foreign income only when you remit it, at rates up to 35%. The caveat is that the best destination depends on your income mix, and the UK exit rules are identical in all three: no destination switches off UK tax by itself.

Dubai (UAE) charges 0% personal income tax on salaries, investment income and capital gains, and the UK-UAE treaty generally sends most private pension income to the UAE, currently taxed at 0%.
Portugal's old NHR regime is closed to new arrivals; IFICI offers a 20% flat rate on qualifying Portuguese professional income for up to ten years but excludes foreign pensions, which face rates up to 48%.
Thailand taxes residents (more than 180 days in a calendar year) on Thai-source income plus foreign income remitted to Thailand, at progressive rates up to 35%, under rules tightened from 1 January 2024.
The UK State Pension keeps its annual increases in Portugal (EEA) but is frozen in both the UAE and Thailand.
The UK side never varies: SRT exit, SA109 split-year claim, UK rent and property gains staying UK-taxable, and the five-year temporary non-residence trap.

Three destinations, three different prizes

Dubai wins on rate: no personal income tax, no local return for ordinary employment and investment income, and a treaty that can send most UK private pension income to the UAE at a current 0%. Portugal wins on treaty certainty and lifestyle: the new UK-Portugal treaty is effective for UK Income Tax and CGT from 6 April 2026, and its pensions article makes UK private pensions taxable only in Portugal. But IFICI's 20% flat rate covers qualifying professional income only, so a retiree pays progressive rates reaching 48% on pensions. Thailand wins on timing flexibility but loses on predictability: foreign income kept outside Thailand is broadly outside the charge, foreign income arising from 1 January 2024 is taxable in the year you remit it, and a proposed relaxation remained unenacted as at mid-2026. The full comparison guide puts the three side by side.

Match the destination to your income mix

A high-earning employee or contractor is hard-pressed to beat Dubai, where full-time work abroad also gives the cleanest exit under the Statutory Residence Test. A retiree drawing UK private pensions finds Dubai strongest, Portugal weakest and Thailand uncertain, because the 1981 UK-Thailand treaty has no pensions article at all; Portugal claws back ground on the State Pension, which keeps its annual increases there while it is frozen in the UAE and Thailand. A qualifying professional in research, tech or innovation can do well under Portugal's IFICI. Anyone keeping a UK rental property faces an identical position everywhere: the rent stays UK-taxable and a sale triggers the 60-day non-resident CGT report.

The UK exit is the constant

Whichever country you pick, HMRC applies the same rules: the SRT decides residence, split-year treatment is claimed on the SA109 for the year you go, and UK-source income follows you. So does the five-year trap: return within five years, having been UK resident in at least four of the seven years before leaving, and the temporary non-residence rules can tax gains realised abroad in your year of return, even gains realised tax-free in Dubai or left unremitted in Thailand. Get the exit wrong and the destination's rates are irrelevant. Horizon handles the UK side of all three moves to fixed fees agreed upfront, with non-resident returns from £550; book a free clarity call at /book before you pick a departure date.

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Sources and further reading

This is general information for the 2026/27 UK tax year, not personal tax advice; speak to a Chartered Tax Adviser about your own position.

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