Do I pay UK tax if I live abroad?
19th June 2026
It is the question British expats ask more than almost any other, and the answer is rarely the one they were hoping for. Moving abroad does not automatically end your UK tax obligations. Whether HMRC can still reach your income, your investments, and potentially your estate depends on a specific set of rules that have nothing to do with where your passport was issued, where your bank account sits, or how long you have been away.
The UK tax system has one gateway question: are you UK tax resident? Everything else flows from that answer. And since April 2025, the rules around what residence means have changed more significantly than at any point in the last generation.
The UK tax system has one gateway question: are you UK tax resident? Everything else flows from that answer. And since April 2025, the rules around what residence means have changed more significantly than at any point in the last generation.
The assumption that gets people into trouble
Most British professionals who move abroad assume that leaving the UK ends the relationship with HMRC. It does not. The UK taxes its residents on their worldwide income and gains. If you are still resident in the UK for tax purposes, you owe UK tax on everything, wherever it arises.
The crucial point is that tax residency is not the same as where you physically live, where you work, or where you hold a visa. It is a legal status determined by a specific mechanical test. You can live full-time in Bangkok, hold a Thai long-term residency visa, and still be UK tax resident if you have not correctly severed your connection under the rules HMRC applies.
Getting this wrong is not a technicality. The consequences include underpaid tax, interest, and penalties going back years.
How HMRC decides where you are: the statutory residence test
Since 2013, UK tax residence has been determined by the Statutory Residence Test, known as the SRT. It is a mechanical, rules-based framework built on day counts, historical residency patterns, and precisely defined ties to the UK. The SRT replaced the old system of case law and subjective intent, and it is applied in order: automatic overseas tests first, then automatic UK tests, then the sufficient ties test if neither of the first two produces a clear answer.
The automatic overseas tests are where most genuine leavers land. If you were UK tax resident in one or more of the three previous tax years and you spend fewer than 16 days in the UK in the current tax year, you are automatically non-resident. If you were not UK resident in any of the previous three tax years and you spend fewer than 46 days, the same result applies. There is also a third route covering those working full-time overseas: non-resident status if you spend fewer than 91 days in the UK, with no more than 30 of those days involving more than three hours of UK work, and no significant break from your overseas role.
Miss these thresholds and you move to the sufficient ties test, where your UK connections are counted and compared against your day count. Ties include having a UK home available to you, a spouse or civil partner resident in the UK, children in UK schools, substantive UK employment, and having spent more than 90 days in the UK in either of the two preceding tax years. The more ties you hold, the fewer days you can spend in the UK before becoming resident again.
One detail catches people repeatedly: the SRT counts days as midnights. You count the nights you spend in the UK, not the days. A same-day business trip that starts and ends without an overnight stay does not count. A trip where you sleep in the UK does. For anyone with borderline day counts, this distinction matters.
Most British professionals who move abroad assume that leaving the UK ends the relationship with HMRC. It does not. The UK taxes its residents on their worldwide income and gains. If you are still resident in the UK for tax purposes, you owe UK tax on everything, wherever it arises.
The crucial point is that tax residency is not the same as where you physically live, where you work, or where you hold a visa. It is a legal status determined by a specific mechanical test. You can live full-time in Bangkok, hold a Thai long-term residency visa, and still be UK tax resident if you have not correctly severed your connection under the rules HMRC applies.
Getting this wrong is not a technicality. The consequences include underpaid tax, interest, and penalties going back years.
How HMRC decides where you are: the statutory residence test
Since 2013, UK tax residence has been determined by the Statutory Residence Test, known as the SRT. It is a mechanical, rules-based framework built on day counts, historical residency patterns, and precisely defined ties to the UK. The SRT replaced the old system of case law and subjective intent, and it is applied in order: automatic overseas tests first, then automatic UK tests, then the sufficient ties test if neither of the first two produces a clear answer.
The automatic overseas tests are where most genuine leavers land. If you were UK tax resident in one or more of the three previous tax years and you spend fewer than 16 days in the UK in the current tax year, you are automatically non-resident. If you were not UK resident in any of the previous three tax years and you spend fewer than 46 days, the same result applies. There is also a third route covering those working full-time overseas: non-resident status if you spend fewer than 91 days in the UK, with no more than 30 of those days involving more than three hours of UK work, and no significant break from your overseas role.
Miss these thresholds and you move to the sufficient ties test, where your UK connections are counted and compared against your day count. Ties include having a UK home available to you, a spouse or civil partner resident in the UK, children in UK schools, substantive UK employment, and having spent more than 90 days in the UK in either of the two preceding tax years. The more ties you hold, the fewer days you can spend in the UK before becoming resident again.
One detail catches people repeatedly: the SRT counts days as midnights. You count the nights you spend in the UK, not the days. A same-day business trip that starts and ends without an overnight stay does not count. A trip where you sleep in the UK does. For anyone with borderline day counts, this distinction matters.
What the 2025 reforms changed
April 2025 brought the most significant restructuring of UK international tax in a generation. The non-domiciled individual regime, which had existed in some form for over 200 years, was abolished. With it went the remittance basis of taxation, which had previously allowed UK-resident non-doms to pay UK tax only on foreign income and gains actually brought into the UK.
From 6 April 2025, all UK tax residents are taxed on their worldwide income and gains as they arise, regardless of domicile. The concept of domicile has been removed from the income tax and capital gains framework entirely.
In its place sits the Foreign Income and Gains regime. This provides a four-year window for individuals who become UK tax resident after at least ten consecutive years of non-residence. During that period, they can elect to pay no UK tax on foreign income and gains, without any requirement to keep the money offshore. After four years, the relief ends and worldwide taxation applies in full.
For British expats living outside the UK, this reform changes relatively little in day-to-day terms. If you are genuinely non-resident under the SRT, you are not subject to UK tax on your foreign income regardless. The bigger impact falls on those who were resident in the UK while relying on non-dom status to shelter overseas wealth, and on those planning to return.
What it does change is the inheritance tax picture. The UK has moved to a residence-based system for IHT, meaning that long-term UK residents are now exposed to UK IHT on their worldwide estates based on years of residence rather than domicile. The implications of this for British expats who have spent significant time in the UK are significant and worth taking separate advice on.
What stays taxable even when you are non-resident
Becoming non-resident does not mean you owe nothing to HMRC. The UK taxes non-residents on income and gains that arise in the UK, regardless of where you live.
UK rental income is the most common example. If you own a property in the UK and let it out, that income remains subject to UK income tax. Under the Non-Resident Landlord Scheme, your letting agent or tenant is required to deduct tax at source and pay it to HMRC unless you apply for authorisation to receive rent gross. Either way, a UK Self Assessment tax return is still required to declare the income, claim allowable expenses, and confirm the correct liability.
UK property capital gains are also taxable. If you sell a UK residential property while non-resident, you must report and pay any capital gains tax within 60 days of completion. This rule applies regardless of how long you have been abroad.
UK employment income earned for work actually carried out in the UK is taxable here, even for non-residents. If you visit the UK for work and perform substantive duties, the income attributable to those days has a UK tax liability. This is a trap for senior executives who travel back to the UK regularly for board meetings or client work.
UK-source interest and dividends from UK companies sit in a different category, generally treated as disregarded income for non-residents and not subject to UK tax in the normal way. But the rules here interact with double tax treaties and the position in your country of residence, so the outcome is not always straightforward.
April 2025 brought the most significant restructuring of UK international tax in a generation. The non-domiciled individual regime, which had existed in some form for over 200 years, was abolished. With it went the remittance basis of taxation, which had previously allowed UK-resident non-doms to pay UK tax only on foreign income and gains actually brought into the UK.
From 6 April 2025, all UK tax residents are taxed on their worldwide income and gains as they arise, regardless of domicile. The concept of domicile has been removed from the income tax and capital gains framework entirely.
In its place sits the Foreign Income and Gains regime. This provides a four-year window for individuals who become UK tax resident after at least ten consecutive years of non-residence. During that period, they can elect to pay no UK tax on foreign income and gains, without any requirement to keep the money offshore. After four years, the relief ends and worldwide taxation applies in full.
For British expats living outside the UK, this reform changes relatively little in day-to-day terms. If you are genuinely non-resident under the SRT, you are not subject to UK tax on your foreign income regardless. The bigger impact falls on those who were resident in the UK while relying on non-dom status to shelter overseas wealth, and on those planning to return.
What it does change is the inheritance tax picture. The UK has moved to a residence-based system for IHT, meaning that long-term UK residents are now exposed to UK IHT on their worldwide estates based on years of residence rather than domicile. The implications of this for British expats who have spent significant time in the UK are significant and worth taking separate advice on.
What stays taxable even when you are non-resident
Becoming non-resident does not mean you owe nothing to HMRC. The UK taxes non-residents on income and gains that arise in the UK, regardless of where you live.
UK rental income is the most common example. If you own a property in the UK and let it out, that income remains subject to UK income tax. Under the Non-Resident Landlord Scheme, your letting agent or tenant is required to deduct tax at source and pay it to HMRC unless you apply for authorisation to receive rent gross. Either way, a UK Self Assessment tax return is still required to declare the income, claim allowable expenses, and confirm the correct liability.
UK property capital gains are also taxable. If you sell a UK residential property while non-resident, you must report and pay any capital gains tax within 60 days of completion. This rule applies regardless of how long you have been abroad.
UK employment income earned for work actually carried out in the UK is taxable here, even for non-residents. If you visit the UK for work and perform substantive duties, the income attributable to those days has a UK tax liability. This is a trap for senior executives who travel back to the UK regularly for board meetings or client work.
UK-source interest and dividends from UK companies sit in a different category, generally treated as disregarded income for non-residents and not subject to UK tax in the normal way. But the rules here interact with double tax treaties and the position in your country of residence, so the outcome is not always straightforward.
How double tax treaties work in practice
The UK has double taxation agreements with around 130 countries, including Thailand. These treaties exist to prevent the same income being taxed in full by two countries simultaneously. They do this by allocating taxing rights: in general, one country gets primary rights to tax a particular type of income, and the other either exempts it or gives a credit for tax already paid.
What a treaty does not do is eliminate tax entirely. It does not override the domestic rules of either country. And it does not mean that income taxed in your country of residence is automatically free of any UK obligation.
The practical effect of the UK-Thailand treaty for a British expat living in Thailand depends heavily on the type of income involved. Employment income, pension income, rental income, investment returns, and business profits are all treated differently under the treaty. The allocation of taxing rights varies by income type, and the interaction with Thai domestic tax rules, including Thailand's own rules on foreign income remitted into the country, adds further complexity.
One important point for British expats in Thailand specifically: the UK-Thailand treaty does not include a dedicated pensions article. This means UK pension income remitted to Thailand may be treated under Thai domestic rules as assessable income, with potential tax implications that are often not anticipated. This is not a theoretical edge case. It is a real issue for retirees drawing pension income into a Thai bank account.
The mistakes that catch people out
Leaving the UK is not the same as leaving the UK tax system. The most common mistakes share a pattern: people assume something is true without checking whether HMRC agrees.
Keeping a UK property available. If you retain a home in the UK that you or an immediate family member can use, this counts as a tie under the SRT. Combined with your day count and other connections, it can push you back into UK residency. The property does not have to be in your name. A room at your parents' house that is available to you can qualify.
Returning too often. For anyone who was UK resident in recent years, the threshold for automatic non-residence is 15 nights per tax year. A few family visits, a wedding, a funeral, and some business travel can add up quickly. Days are counted by midnight presence. Many people are surprised by how restrictive this is in practice.
The temporary non-residence trap. If you leave the UK and return within five complete tax years, any capital gains realised while you were abroad on assets you held before leaving can be brought back into the UK tax net on your return. This rule applies to individuals who were UK resident for four or more of the seven tax years before departure. It means that extracting gains while abroad is not as clean as it looks if you intend to come back.
Assuming a foreign employment contract solves everything. Where you are employed and who pays you does not determine your tax residence. The SRT is based on where you are physically present and what ties you maintain. A foreign-based salary does not make you non-resident.
What this means in practice
The honest answer to the question at the top of this page is: it depends, and the detail matters more than most people realise.
If you are genuinely non-resident under the SRT, your foreign income and overseas investment returns are outside the scope of UK tax. Your UK-source income may still carry a UK liability. Your UK property remains in the system. And your tax position in your country of residence creates its own set of obligations that interact with your UK position in ways that are rarely straightforward.
Since April 2025, the framework has become more rules-based and less forgiving. The old safety nets of domicile and the remittance basis are gone. Residence is now the only thing that matters for income and gains tax, and it is determined by a mechanical test that rewards those who plan carefully and penalises those who assume.
This is not an area where broad rules of thumb hold up well. The SRT is 105 pages of HMRC guidance for a reason. If you are unsure of your position, or if your circumstances have changed recently, taking proper advice before filing is considerably less expensive than correcting a mistake afterwards.
We work with British expats across Asia and the Middle East on exactly these questions. If you would like to talk through your UK tax position, you can book an initial call below.
The UK has double taxation agreements with around 130 countries, including Thailand. These treaties exist to prevent the same income being taxed in full by two countries simultaneously. They do this by allocating taxing rights: in general, one country gets primary rights to tax a particular type of income, and the other either exempts it or gives a credit for tax already paid.
What a treaty does not do is eliminate tax entirely. It does not override the domestic rules of either country. And it does not mean that income taxed in your country of residence is automatically free of any UK obligation.
The practical effect of the UK-Thailand treaty for a British expat living in Thailand depends heavily on the type of income involved. Employment income, pension income, rental income, investment returns, and business profits are all treated differently under the treaty. The allocation of taxing rights varies by income type, and the interaction with Thai domestic tax rules, including Thailand's own rules on foreign income remitted into the country, adds further complexity.
One important point for British expats in Thailand specifically: the UK-Thailand treaty does not include a dedicated pensions article. This means UK pension income remitted to Thailand may be treated under Thai domestic rules as assessable income, with potential tax implications that are often not anticipated. This is not a theoretical edge case. It is a real issue for retirees drawing pension income into a Thai bank account.
The mistakes that catch people out
Leaving the UK is not the same as leaving the UK tax system. The most common mistakes share a pattern: people assume something is true without checking whether HMRC agrees.
Keeping a UK property available. If you retain a home in the UK that you or an immediate family member can use, this counts as a tie under the SRT. Combined with your day count and other connections, it can push you back into UK residency. The property does not have to be in your name. A room at your parents' house that is available to you can qualify.
Returning too often. For anyone who was UK resident in recent years, the threshold for automatic non-residence is 15 nights per tax year. A few family visits, a wedding, a funeral, and some business travel can add up quickly. Days are counted by midnight presence. Many people are surprised by how restrictive this is in practice.
The temporary non-residence trap. If you leave the UK and return within five complete tax years, any capital gains realised while you were abroad on assets you held before leaving can be brought back into the UK tax net on your return. This rule applies to individuals who were UK resident for four or more of the seven tax years before departure. It means that extracting gains while abroad is not as clean as it looks if you intend to come back.
Assuming a foreign employment contract solves everything. Where you are employed and who pays you does not determine your tax residence. The SRT is based on where you are physically present and what ties you maintain. A foreign-based salary does not make you non-resident.
What this means in practice
The honest answer to the question at the top of this page is: it depends, and the detail matters more than most people realise.
If you are genuinely non-resident under the SRT, your foreign income and overseas investment returns are outside the scope of UK tax. Your UK-source income may still carry a UK liability. Your UK property remains in the system. And your tax position in your country of residence creates its own set of obligations that interact with your UK position in ways that are rarely straightforward.
Since April 2025, the framework has become more rules-based and less forgiving. The old safety nets of domicile and the remittance basis are gone. Residence is now the only thing that matters for income and gains tax, and it is determined by a mechanical test that rewards those who plan carefully and penalises those who assume.
This is not an area where broad rules of thumb hold up well. The SRT is 105 pages of HMRC guidance for a reason. If you are unsure of your position, or if your circumstances have changed recently, taking proper advice before filing is considerably less expensive than correcting a mistake afterwards.
We work with British expats across Asia and the Middle East on exactly these questions. If you would like to talk through your UK tax position, you can book an initial call below.
