UK Tax When Moving From the UK to Thailand

It depends on your residence status and on the type of income or gain. Once you become non-resident under the Statutory Residence Test, the UK generally stops taxing your foreign income and gains. However, the UK continues to tax income and gains that have a UK source: rent from UK property, gains on UK property, most UK pensions, and pay for duties you perform in the UK.

Becoming non-resident is not automatic just because you have flown out. You have to satisfy the SRT, and in the year you leave you may still be UK resident for the whole year unless split-year treatment applies. So the first job is always to fix your residence position, then map each income stream against UK and Thai rules.

Your UK residence is decided by the Statutory Residence Test (SRT), introduced in Finance Act 2013 and set out in HMRC guidance note RDR3 (last updated 11 June 2026). The test is applied separately for each UK tax year, so you can be resident one year and non-resident the next. There are three stages, worked in order.

• Automatic overseas tests: meet one of these (for example, fewer than 16 UK days, or working full-time abroad with limited UK days) and you are automatically non-resident.
• Automatic UK tests: if no overseas test is met, you are automatically UK resident if you meet one of these, including spending 183 or more days in the UK in the tax year.
• Sufficient ties test: if neither set is conclusive, you compare your UK days against the number of UK ties you have (family, accommodation, work, 90-day and, for leavers, country ties).

Because the SRT counts UK days, keeping a careful travel diary from the day you leave matters. Use our SRT calculator to model your day counts and ties, and read the dedicated Statutory Residence Test guide for the detail behind each limb.

Split-year treatment can divide the tax year you leave into a UK part and an overseas part, so the UK only taxes your worldwide income for the UK part. Without it, you could be UK resident for the whole tax year of departure even though you left part way through, which would expose your post-departure foreign income to UK tax.

Split-year treatment is not optional or freely chosen; you must fall within one of HMRC's specific cases, such as starting full-time work overseas or ceasing to have a UK home. You claim it on the residence pages (SA109) of your Self Assessment return. The split point is set by the rules of the case you qualify under, not simply the date your flight departs.

Even where split-year applies, UK-source income arising in the overseas part (UK rent, UK property gains, certain UK pensions and UK workdays) generally remains UK-taxable. Split-year shelters foreign income from the date you leave, not UK income.

This rule stops short absences from washing out UK tax on certain income and gains. If your period of non-residence does not exceed five years (in practice you need at least five years and one day), and you were UK resident in at least 4 of the 7 tax years before you left, certain income and gains that arise while you are away are taxed in the UK in the year you return.

A technical note: HMRC's condition refers to sole UK residence in at least 4 of the 7 tax years before departure, which can differ for someone who was treaty-resident in another country during those years. For most people leaving the UK this distinction makes no difference, but it can matter if you held dual residence, so take advice if that applies to you.

Items caught can include certain capital gains, some pension withdrawals (for example flexibly accessing a pension while abroad) and close-company distributions, such as dividends from your own UK company. The mechanism is a charge in the year of return, not in the year the gain or income actually arose.

The practical lesson is timing. If you intend to crystallise a large gain or take a significant pension lump sum after leaving, the difference between a four-and-a-half-year absence and a five-year-and-one-day absence can be the difference between a UK charge and no UK charge. Plan the length of your absence and the timing of disposals together.

Becoming non-resident does not switch off UK tax on UK-source items. The table below summarises the common categories for someone moving to Thailand. Treaty wording can modify some outcomes, which is why the pension row in particular needs care.

If you keep a UK property and let it out, the rental profit stays fully within UK tax regardless of where you live. UK property income is one category where double tax treaties generally do not restrict the UK's taxing right, so the UK taxes it first.

Under the Non-Resident Landlord Scheme, a letting agent or tenant would otherwise have to deduct basic-rate tax from your rent before paying it to you. To receive rent gross and settle the tax through Self Assessment instead, you apply to HMRC using form NRL1 (NRL2 for companies, NRL3 for trustees). You will still file a UK Self Assessment return each year reporting the rental profit.

Thailand may also tax that rental income to the extent you remit it there. Where both countries tax the same income, double tax relief under the treaty should prevent it being taxed twice, but you must confirm the Thai treatment locally.

Non-residents remain liable to UK Capital Gains Tax on disposals of UK property. When you sell UK residential property you must file a non-resident CGT (NRCGT) return and pay any tax due within 60 days of completion. Note that older guidance citing a 30-day window is out of date; the current deadline is 60 days.

Importantly, the non-resident reporting obligation is broader than residential gains. As a non-resident you must report all disposals of UK land and property within 60 days, including commercial property and disposals where no tax is due, not only chargeable residential gains. The 60-day return is separate from your annual Self Assessment, and the deadline runs from completion, not from when funds clear. Private Residence Relief may reduce a gain on a former home, but the rules for non-residents are restrictive, so take advice before assuming relief is available. See the guide on CGT on UK property for non-residents for the detail.

UK pension income stays within UK tax rules after you move. How it interacts with Thailand depends on the treaty, and here is the important caveat: the 1981 UK-Thailand Double Taxation Convention (in force, modified by the MLI from 1 January 2023) contains no pensions article.

That gap matters. UK government-service pensions (for example certain public-sector pensions) are taxable only in the UK. Private, personal and company pensions are not protected by a pensions article, so the treaty does not cleanly hand taxing rights to one country, and Thailand can in principle tax such pensions as foreign income remitted to Thailand. The outcome for your specific pension needs both UK and Thai advice.

The UK State Pension is payable abroad but is frozen (it does not receive annual increases) in Thailand because there is no reciprocal uprating agreement. Factor that into long-term retirement planning.

Moving abroad sometimes prompts the question of whether to transfer a UK pension overseas into a Qualifying Recognised Overseas Pension Scheme (QROPS). This is a major decision with its own tax charge to consider, the Overseas Transfer Charge, which can apply at 25% of the transfer value unless an exclusion is met.

There is currently no recognised QROPS regime aimed at Thailand specifically, so a transfer would typically be to a scheme in another jurisdiction, which adds complexity and regulatory risk. For most UK pensioners retiring to Thailand, leaving the pension in the UK and drawing it under the UK rules is the simpler and often safer route. Read the foreign pensions and QROPS guide and take regulated pension-transfer advice before doing anything.

This section is indicative only and must be confirmed with a qualified Thai adviser. Thai personal tax rules for foreign income changed from 1 January 2024 and a further relaxation has been proposed but not enacted, so the position is genuinely moving.

In outline: you become a Thai tax resident if you are present in Thailand for 180 days or more in a calendar (tax) year. A Thai tax resident is taxed on Thai-source income and on foreign-source income that is remitted (brought) into Thailand. Foreign income kept outside Thailand and not remitted has historically been outside the charge, which is why remittance timing matters.

Departmental Instruction Por.161/2566 (issued 15 September 2023, effective from 1 January 2024) removed the old same-year deferral loophole, so foreign income remitted to Thailand is taxable in the year of remittance regardless of when it was earned. Por.162/2566 (20 November 2023) limits this to income arising on or after 1 January 2024, so foreign income earned before 1 January 2024 stays exempt even if remitted later.

Important moving target: in 2025 the Thai Revenue Department proposed a draft royal decree to exempt foreign income remitted in the same year it is earned or the following year, partly reversing the 2024 change. As at June 2026 this had not been enacted and was reported as paused amid political upheaval (a change of Prime Minister and dissolution of the House, with a general election set for 8 February 2026). Do not rely on the draft; the Por.161/162 rules remain in force. Check the current status before you plan around it.

This example is illustrative and uses round numbers to show the mechanism, not real figures or rates. Take advice before relying on it.

Suppose you were UK resident for many years (so you meet the 4-of-7-years condition) and already own a portfolio of shares when you leave for Thailand. While abroad you sell that portfolio and realise a gain of GBP 100,000. You then return to the UK after a total absence of four years.

• Because your absence (four years) did not exceed five years, you are a temporary non-resident, so the GBP 100,000 gain on shares you owned before leaving is brought back into UK tax in the year you return. Gains on assets you both buy and sell while non-resident are generally outside this rule.
• If instead you had stayed non-resident for at least five years and one day, the same gain would fall outside the temporary non-residence rule and would not be clawed back to the UK.
• The same logic can apply to a pension lump sum taken while abroad and to dividends from your own UK close company.

The arithmetic is simple but the planning is not: the trigger is the length of your absence, decided years in advance, combined with when you crystallise the gain. If a substantial disposal is on the horizon, plan the duration of your absence and the timing of the sale together.

Doing the paperwork properly before and around your departure makes the UK side clean and helps you claim any refund due. A typical checklist looks like this.

• Confirm your residence position under the SRT for the year of departure and the first full year abroad, and check whether split-year treatment applies.
• File Form P85 if you are leaving and not completing a return, or report leaving on the SA109 residence page if you are within Self Assessment.
• Keep a precise day-by-day record of UK presence from the day you leave, to support your non-resident status.
• If you keep UK property to let, register under the Non-Resident Landlord Scheme using form NRL1 so you receive rent gross.
• Plan the timing of any large capital disposals or pension withdrawals against the 5-year temporary non-residence rule.
• Take regulated advice before any QROPS pension transfer, given the Overseas Transfer Charge.
• Engage a qualified Thai adviser to confirm your Thai residence and remittance position before you move money.
• Review your UK Inheritance Tax exposure, as IHT can follow you based on long-term UK connection even after you leave.