Most British expats in Singapore, Dubai and Hong Kong assume double taxation is not their problem, because their new home taxes UK income lightly or not at all. Yet UK rent, fees for UK board meetings, gains on UK property and some UK pensions can stay within UK tax wherever you live. The risk is greatest in the year you leave, the year you come back and any year in which two countries both treat you as resident.
Double taxation agreements (tax treaties between two countries) and the UK’s own relief rules exist to stop the same income being taxed twice, but relief is rarely automatic: you typically have to apply for it in advance or claim a refund. Residence comes first, because it decides which treaty and which claim apply to you.
What Is Double Taxation?
Double taxation happens when the same income or gain is taxed twice. In its international (or juridical) sense, two countries tax the same person on the same income or gain for the same period. Economic double taxation is different: the same profit is taxed in the hands of two different taxpayers, typically a company and then its shareholders when the profit is paid out as dividends.
International double taxation is the predictable result of two ordinary tax rules meeting. Most countries tax their residents on income wherever in the world it arises, and also tax Non-Residents on income that arises within their borders. When you live in one country and earn in another, your home country’s worldwide rule and the other country’s source rule can both apply to the same funds.
For the UK, the dividing line is residence, decided afresh for each Tax Year under the Statutory Residence Test (SRT). The SRT is self-assessed, so HM Revenue & Customs (HMRC) issues no certificate of non-residence. When you count your days in the UK, a day generally counts only if you are physically present in the UK at midnight Greenwich Mean Time, and the day you leave does not normally count.
UK residents are taxed on their worldwide income and gains unless a relief applies, and the main reliefs are not given automatically: you have to claim each of them.
The first two are the Foreign Income and Gains (FIG) regime, which relieves certain foreign income and gains in your first four Tax Years of UK residence if you were Non-Resident for the 10 complete and consecutive Tax Years before you arrived, and Overseas Workday Relief, which relieves pay for work done outside the UK in those same four Tax Years.
The third main relief is treaty relief. Where a tax treaty between the UK and another country gives that country the right to tax your income, the treaty can remove or reduce the UK tax on it, or let you set the foreign tax paid against your UK tax.
Once you are Non-Resident, the UK’s reach generally shrinks to income arising in the UK, pay for duties of employment performed in the UK, and gains on a limited range of UK assets. Double taxation therefore reaches British expats by two routes: UK-source income that the UK keeps taxing after you leave, and foreign income in any year when you are still, or once again, UK resident.
Who Is Affected by Double Taxation?
Anyone whose income or gains cross a border can be affected.
A Worker Posted Abroad
Postings are where double taxation is most common, because your UK residence does not necessarily end on the day you fly. The SRT decides your status for a whole Tax Year at a time, so unless Split Year treatment applies, you can remain UK resident for the entire year in which you leave.
If you move to Singapore or Hong Kong partway through a Tax Year, the Singapore or Hong Kong tax authority will typically tax your salary for the work you do there from your first day. The UK may also tax it if you are UK resident for that Tax Year. Split Year treatment can avoid this by dividing that year into a UK part and an overseas part, but only if you meet all its conditions.
Full-Time Work Abroad is one of the clearest routes to Non-Resident status under the SRT. You must work overseas for an average of 35 or more hours a week with no significant break from overseas work, and spend fewer than 91 days in the UK in the Tax Year. Working in the UK is allowed, but if you work more than three hours on more than 30 days, you fail the test.
That is shorthand for a detailed statutory calculation, and the full steps must be worked through before you rely on the test.
If you stay on a UK payroll during a posting, you should also expect PAYE to continue on your overseas pay until the position is corrected. To recover UK tax deducted that you do not owe, you typically need to file an expat tax return, the Self-Assessment return on which you also report your residence position.
A Retired Person Abroad
If you retire abroad, your exposure comes through your pensions. UK pensions are UK-source income, so HMRC taxes them unless the UK’s treaty with your new country gives that country the sole right to tax them.
A Company Director or Board Member
If you sit on the board of a UK company, you face a charge that is easy to overlook. Under the directors’ fees article of the UK’s treaties with Singapore, the UAE and Hong Kong, the UK keeps the right to tax fees a UK-resident company pays to a member of its board.
UK law taxes a Non-Resident director only on fees for duties performed in the UK, so in practice fees for board meetings you attend in person in the UK are taxable here from the first day. Ordinary employees on short UK visits are often exempt from UK tax on their pay under the treaty’s employment article, subject to conditions such as a limit on days in the UK. Directors’ fees fall under a separate article with no such exemption.
Singapore, Dubai and Hong Kong generally do not tax fees from a UK company, so there is no foreign credit to offset that UK tax.
Attending board meetings in the UK in person carries a second risk. Each day on which you work more than three hours in the UK is a UK workday, and 40 or more of them in a Tax Year creates a work tie under the SRT, which can tip a borderline year into UK residence.
If your situation is not covered by the examples above, or you are unsure whether double taxation affects you, Spice Taxation can review your position with you.
How Double Taxation Works
Double taxation comes from collisions between tax systems:
- Residence against source: UK rent received by someone living in a country that taxes worldwide income is the classic case.
- Residence against residence: two countries can each treat you as resident under their own rules in the same year, most often the year you move. Each then claims your worldwide income. The treaty’s tie-breaker tests decide between them, but only if you make a claim with your Self-Assessment return, using the claim form in HMRC helpsheet HS302 for dual residents.
- Mismatched Tax Years: the UK Tax Year runs from 6th April to 5th April and Singapore taxes income by calendar year, so one salary or one gain can fall into different years in each country, which complicates any claim for credit.
Relief only removes the overlap, so you end up paying at the higher of the two rates. If the foreign tax on your income is lower than the UK tax on the same income, the UK collects the balance. If the foreign tax is higher, HMRC does not refund the excess.
Double Taxation Relief Methods Compared
| Relief | How it works | Who can use it | How to claim |
| Treaty exemption or reduction | The treaty removes the UK tax on your UK income, or caps the rate | Non-Residents living in a country that has a treaty with the UK | Form DT-Individual, or with your Self-Assessment return |
| Treaty credit relief | Your UK tax on foreign income is reduced by the foreign tax paid on it, up to the UK tax due | UK residents with income taxed in a treaty country | Foreign pages (SA106) of your Self-Assessment return |
| Unilateral relief | The same credit, given under UK law where no treaty covers the tax | UK residents | Foreign pages (SA106) of your Self-Assessment return |
| Deduction relief | The foreign tax is deducted from the income, so less income is taxed in the UK | UK residents for whom a credit gives no benefit | Your Self-Assessment return |
Double Taxation Examples
The examples below are illustrative and use 2026/27 UK rates and allowances.
Moving to Singapore With Split Year Treatment
David leaves London on 1st July 2026 to start a full-time job in Singapore that is expected to last several years. He meets all the conditions of Split Year Case 1 (starting Full-Time Work Abroad), which he claims on his Self-Assessment return, so his 2026/27 Tax Year divides into a UK part and an overseas part.
The UK taxes his London salary for the UK part of the year but not his Singapore salary for the overseas part, whilst Singapore taxes the salary for his work in Singapore. Each salary is taxed in one country only, so no double taxation arises. Had he failed one condition, he would have been UK resident for the whole year, as Sarah’s example below shows.
Leaving Partway Through the Year Without Split Year Treatment
Sarah also moves from London to Singapore, in October, to take up a new role. Unlike David, she does not meet the conditions for Split Year treatment, so she is UK resident for the whole Tax Year and the UK taxes her Singapore salary alongside her London salary. Singapore taxes the Singapore salary as well.
If the Singapore income tax on that salary is £9,000 and the UK tax on the same salary is £24,000, the UK allows a credit of £9,000 and collects the remaining £15,000. Sarah pays £24,000 in total on her Singapore salary.
Living in Dubai With a UK Rental Property
Priya lives in Dubai and lets her former home in Manchester for a net profit of £18,000. Dubai charges no personal income tax, so no second tax arises. The UK still taxes the rent, because the treaty leaves property income taxable where the property is.
Under the UK property tax rules for Non-Resident landlords, her letting agent (or, with no agent, a tenant paying more than £100 a week) is legally required to deduct basic rate tax from the rent, after allowable costs, and pay it to HMRC quarterly, unless HMRC approves her application on Form NRL1i to receive it gross.
As a British national, Priya is entitled to the Personal Allowance, and with £12,570 claimed her UK tax is £1,086. The Personal Allowance is only given if it is claimed each year, which for Priya means filing a Self-Assessment return.
Returning to the UK and Keeping a Property in Singapore
Tom returns to London after eight years in Singapore and lets out his Singapore property. As a UK resident he is taxed on his worldwide income, so the Singapore rent is taxable in the UK, whilst Singapore also taxes it because the property is in Singapore.
On a rental profit of £12,000 taxed at 40%, the UK tax is £4,800 (from 6th April 2027, the rates of tax on property income rise by 2 percentage points, to 22%, 42% and 47%). If Tom has paid £3,000 of Singapore tax on the same rent, he pays HMRC the remaining £1,800.
How to Avoid Double Taxation
Double Taxation Agreements
A double taxation agreement (DTA), also called a double tax treaty, is an agreement between two countries that decides which of them may tax each type of income and how the other must give relief. The UK has tax treaties with Singapore, the United Arab Emirates and Hong Kong, among many other countries.
Where a treaty and UK domestic law conflict, the treaty takes priority, but only if you are resident in the UK or in the other country that signed it, and you claim the relief.
Our guide to the double taxation treaty sets out how each article allocates employment income, pensions, property income and gains, how the Singapore, Dubai and Hong Kong agreements differ, what a treaty does not do, and how the estate duty treaties work.
Unilateral Relief
Where there is no treaty, or the treaty does not cover the tax in question, UK law still gives relief, known as unilateral relief. It applies only to foreign tax you have actually paid, and only where that tax is similar to UK Income Tax or Capital Gains Tax. Unilateral relief matters most for income from the few countries without a UK treaty, and for foreign taxes that fall outside a treaty’s scope.
Foreign Tax Credits
A foreign tax credit reduces your UK tax by the foreign tax paid on the same income or gain. The credit is the lower of two figures: the foreign tax paid (or the amount the treaty allows the other country to charge, if that is less), and the UK tax on that income or gain. Each income or gain is worked out separately, so excess foreign tax on one gain cannot be used against the UK tax on another.
The credit is claimed on the foreign pages (SA106) of the Self-Assessment return. In a year when a credit gives no benefit, for example because losses leave no UK tax to credit against, you can instead deduct the foreign tax from the income, which HMRC calls deduction relief.
The point most expats miss is that UK credit relief is only available to UK residents (and to residents of the Isle of Man and the Channel Islands). As a Non-Resident, you cannot set foreign tax against the UK tax on your UK income. Any credit must come from your country of residence.
How to Claim Tax Relief
If you are Non-Resident and live in a country that has a treaty with the UK, relief from UK tax on your UK income can be given in one of two ways. You can apply before the tax is deducted, so that the payer pays you gross or at the treaty rate, or you can claim a refund afterwards.
Applying in advance is almost always better, because a refund must be claimed within four years of the end of the Tax Year concerned.
What Income You Can Claim For
HMRC accepts treaty claims on most types of UK income that a treaty allocates to your country of residence, including:
- Pensions and annuities: most UK pensions.
- Employment and self-employment income: pay for work done in the UK, where the treaty’s conditions are met.
- Interest: interest from UK banks and building societies.
- Dividends: dividends from UK companies, under special rules.
- Royalties: royalties arising in the UK.
Rental income from UK property generally cannot be relieved by a claim, because it stays taxable in the UK under almost every treaty.
Doubly Taxed UK Employment Income
Pay for work physically done in the UK is UK-source income, so the UK can tax it even when you are Non-Resident. For residents of Singapore, the UAE and Hong Kong who come to the UK for short periods, the short-stay exemption in the employment article of the double taxation treaty may remove the UK charge, but only if every one of its conditions is met.
Capital Gains Tax
Non-Residents pay UK Capital Gains Tax on UK land and property, on shares in property-rich companies and unit funds, and on UK trading assets, but not on UK shares or other financial assets. HMRC’s guidance is that double taxation agreements do not apply to tax on gains from selling UK residential property, and the Singapore, UAE and Hong Kong treaties also leave gains on other UK land and property taxable in the UK.
Singapore, Dubai and Hong Kong generally do not tax capital gains, so a gain on UK property bears one tax, the UK’s, which must be reported and paid within 60 days of completion. The 60-day return is required even where no tax is due. Our guide to UK Capital Gains Tax covers the calculation methods available to Non-Residents.
Double taxation of gains is more likely when you come back. The Temporary Non-Residence rules apply if you were UK resident in at least four of the seven Tax Years before you left and you return to the UK within five years. A gain on an asset you owned when you left, and sold whilst abroad, can then be taxed in the Tax Year you return.
UK property gains are not part of this, because they stay within UK Capital Gains Tax at all times. If a return within five years is unavoidable, the provisions of a Double Tax Treaty could potentially override the Temporary Non-Residence provisions, so take advice before you sell. Where the country you lived in also taxed the gain, you can usually claim relief for that foreign tax.
Fill in a Claim Form
HMRC has its own claim forms for residents of Australia, Canada, France, Germany, Ireland, Japan, New Zealand, the Netherlands, South Africa, Spain, Sweden, Switzerland and the USA. Residents of everywhere else, including Singapore, the UAE and Hong Kong, use the standard Form DT-Individual. The form covers both relief at source and repayment of UK Income Tax already deducted.
Once completed, the form goes to the tax authority in your country of residence, which certifies on the form that you are resident there (your certificate of residence) and then either sends the form to HMRC or returns it to you to send on.
When HMRC accepts the claim, it tells the payer, such as a pension provider, to stop deducting UK tax or to deduct it at the treaty rate. Until that instruction arrives, tax continues to be deducted and has to be recovered as a refund.
If you already file a Self-Assessment return, the treaty claim can be made on the return, including Form SA109, and your certificate of residence sent in with it.
Double Taxation Checklist
- Confirm your UK residence position for each Tax Year under the Statutory Residence Test, including whether Split Year treatment applies.
- When you leave the UK after UK employment, file Form P85 (unless you will file a Self-Assessment return for that year) to close your UK employment record and claim any refund due.
- List every source of UK income and gains that continues after you leave, such as rent, pensions, board fees, pay for UK workdays and any property you may sell.
- Check the treaty between the UK and your country of residence for each type of income, remembering that government service pensions, UK pensions paid to Hong Kong residents and UK rental income usually stay taxable in the UK.
- If you are Non-Resident, claim treaty relief on Form DT-Individual, with a certificate of residence from your country’s tax authority, so that UK tax stops being deducted at source.
- Claim your Personal Allowance each year if you have UK income that remains taxable, using Form R43 instead of a Self-Assessment return where your rental profit and other UK income fall within the Personal Allowance.
- If you are Non-Resident, report and pay the tax on any disposal of UK land or property, including a gift, within 60 days of completion, and file the return even where no tax is due.
- In any year you are UK resident, claim Foreign Tax Credit Relief on the foreign pages of your Self-Assessment return and keep evidence of the foreign tax paid.
- Keep your UK workdays below 40 in a Tax Year if you want to avoid a work tie, record every board meeting you attend in person, and handle board matters remotely where you can.
- Diary your claim deadlines for each Tax Year.
- Before returning to the UK, review gains on assets you held when you left, check whether the Temporary Non-Residence rules or the FIG regime apply to you, and decide which disposals are best made whilst you are still Non-Resident.
Why Choose Spice Taxation for Help with Double Taxation?
- Reliefs actually claimed: we prepare your Self-Assessment returns and treaty claims, including Form DT-Individual, so you receive every allowance and relief you are entitled to, within the time limits.
- Residence first: the Statutory Residence Test is the first question we work through with almost every client, because it decides which reliefs are available at all.
- Planning flagged early: we spot the expensive moments before they arrive, whether a move in either direction, a UK property sale, a pension decision, or the year your FIG or long-term residence position changes.
- Over 30 years of UK tax experience: led by Martin Rimmer, a Fellow of the Association of Taxation Technicians who has advised British expats since 1997, with Tax Manager Christine Teo covering UK and Singapore personal tax.
- UK expat tax is all we do: an independent UK personal tax practice built around British expats and internationally mobile clients, more than 80% of whom live outside the UK.
- Based in Singapore, helping clients around the world: we deal with cross-border and Non-Resident issues every day, and whilst we are based in Asia, we help clients wherever they live.
- Fixed fees, agreed up front: everything we do, whether Tax Returns, treaty claims or structured tax advice, is based on fixed fees, so you know the cost before you commit.
- Independent advice, no referral arrangements: we have no commercial relationships with financial advisers, insurance companies or property agents, and any introduction we make to another specialist is made purely on merit, with no remuneration to us.
FAQs
Why Am I Being Double Taxed?
In our experience, what feels like double taxation is often UK tax that relief was available for but never claimed. The usual causes are a UK pension still taxed at source because no DT-Individual claim was made, UK pay still under PAYE after you left, Split Year treatment not claimed on the Self-Assessment return in the year of a move, and a treaty tie-breaker not claimed in a year when two countries both treated you as resident.
If both tax authorities still refuse relief, the treaty’s mutual agreement procedure may help.
Can I Be Taxed Twice in the Year I Move Back to the UK?
It is the year it happens most. If you are UK resident in the Tax Year you return, you are resident for the whole of it and, unless Split Year treatment applies, income you earned abroad before the move falls within UK tax as well as foreign tax.
Split Year treatment must be claimed on the Self-Assessment return, and foreign income arising in the overseas part of the year then generally falls outside the UK charge. Where it does not apply, you claim credit for the foreign tax paid. If you qualify for the FIG regime on your return, note that since 6th April 2025 a Split Year counts as a full year of UK residence, and so uses up one of your four years.
Does the 183-Day Rule Prevent Double Taxation?
The 183-day rule does not prevent double taxation on its own. Spending fewer than 183 days in the UK does not by itself make you Non-Resident under the SRT, and other countries count days under their own rules, so you can be resident in two countries in the same Tax Year. The treaty tie-breaker then decides which country you belong to, if you claim it. The other 183-day rules are explained in our double taxation treaty guide.
How Far Back Can I Claim Double Taxation Relief?
For Income Tax and Capital Gains Tax, a claim for credit relief must be made by the fourth anniversary of the end of the Tax Year concerned or, if later, by 31st January following the Tax Year in which the foreign tax was paid. For 2022/23, that means 5th April 2027 at the latest, unless the foreign tax was settled later. Treaty repayment claims by Non-Residents are subject to the general four-year limit.
What Documents Do I Need to Claim Double Taxation Relief?
If you are UK resident and claiming a foreign tax credit, keep the foreign tax assessment or statement showing the foreign tax you paid, because you enter that figure on the foreign pages (SA106) of your Self-Assessment return.
If you are Non-Resident and claiming treaty relief on your UK income, you will need a certificate of residence from the tax authority of the country where you live.
Can a Foreign Tax Credit Be Carried Forward?
For individuals, it cannot. Foreign tax that cannot be credited against UK tax on the same income in the same year is lost for UK purposes: it cannot be carried forward or back to another year. If you paid more foreign tax than the treaty allows, the excess must be reclaimed from the foreign tax authority instead.
Is Double Taxation Legal?
Yes. Every country is entitled to tax under its own laws, and paying tax in one country does not in itself stop another from taxing the same income. Assuming that foreign tax, or the absence of it, settles your UK position can leave UK tax unpaid, and interest and penalties may follow if HMRC opens an enquiry.
References
HM Revenue & Customs. (n.d.). INTM162560: UK residents with foreign income or gains: Claims for double taxation relief against UK tax: Time limits. GOV.UK. https://www.gov.uk/hmrc-internal-manuals/international-manual/intm162560
HM Revenue & Customs. (n.d.). INTM332210: Double Taxation applications and claims: Subject to tax: Background. GOV.UK. https://www.gov.uk/hmrc-internal-manuals/international-manual/intm332210
HM Revenue & Customs. (n.d.). Tax on your UK income if you live abroad: If you’re taxed twice. GOV.UK. https://www.gov.uk/tax-uk-income-live-abroad/taxed-twice
HM Revenue & Customs. (2022). Double taxation: Treaty relief (Form DT-Individual). GOV.UK. https://www.gov.uk/government/publications/double-taxation-treaty-relief-form-dt-individual
HM Revenue & Customs. (2026a). HS304 Non-residents: Relief under double taxation agreements (2026). GOV.UK. https://www.gov.uk/government/publications/non-residents-relief-under-double-taxation-agreements-hs304-self-assessment-helpsheet/hs304-non-residents-relief-under-double-taxation-agreements-2026
HM Revenue & Customs. (2026b). Relief for foreign tax paid 2026 (HS263). GOV.UK. https://www.gov.uk/government/publications/calculating-foreign-tax-credit-relief-on-income-hs263-self-assessment-helpsheet/relief-for-foreign-tax-paid-2026-hs263
Inland Revenue Authority of Singapore. (n.d.). Claiming exemptions under Avoidance of Double Taxation Agreements (DTAs). IRAS. https://www.iras.gov.sg/taxes/individual-income-tax/basics-of-individual-income-tax/tax-residency-and-tax-rates/claiming-exemptions-under-Avoidance-of-Double-Taxation-Agreements-(DTAs)
Inland Revenue Department. (n.d.). Double taxation relief. The Government of the Hong Kong Special Administrative Region. https://www.ird.gov.hk/eng/pol/dta.htm
Ministry of Finance. (n.d.). Double taxation agreements (DTAs). United Arab Emirates. https://mof.gov.ae/en/public-finance/international-relations/double-taxation-agreements-dtas/