UK Tax for Expats: The Complete Guide
A comprehensive guide to how UK tax works when you live abroad — covering residency rules, the Statutory Residence Test, double taxation agreements, capital gains, rental income, inheritance tax, and why professional expat tax planning matters.
When you leave the UK, your tax obligations change — but they don't necessarily disappear. Whether you still pay UK tax depends on your residency status under the Statutory Residence Test (SRT), the type of income you receive, and the Double Taxation Agreement between the UK and your country of residence. UK rental income, certain capital gains, and inheritance tax based on domicile can all follow you overseas. Understanding these rules before you move is essential to avoid unexpected tax bills and missed planning opportunities.
Key Takeaways
- UK expats may still be taxed depending on residency status under the Statutory Residence Test
- The SRT uses day counts and UK ties to determine tax residency — not nationality
- Double Taxation Agreements prevent paying tax twice on the same income
- UK rental income and certain capital gains remain taxable regardless of where you live
- Inheritance Tax is based on domicile, not residence — it can follow you overseas
- Professional cross-border tax advice before relocating can save thousands
UK Tax Residency Rules
Your UK tax obligations are determined primarily by your tax residency status, not your nationality or citizenship. Since April 2013, the Statutory Residence Test (SRT) has been the legal framework for determining whether an individual is UK tax resident in any given tax year. If you are UK resident, you are generally taxed on your worldwide income and gains. If you are non-UK resident, you are only taxed on UK-source income.
The Statutory Residence Test (SRT)
The SRT works through three tests applied in order:
- Automatic Overseas Test: You are automatically non-UK resident if you were UK resident in one or more of the previous three tax years and spend fewer than 16 days in the UK, OR if you were not UK resident in any of the previous three tax years and spend fewer than 46 days in the UK.
- Automatic UK Test: You are automatically UK resident if you spend 183 or more days in the UK, or if your only home is in the UK for a period of at least 91 consecutive days (of which at least 30 fall in the tax year).
- Sufficient Ties Test: If neither automatic test applies, your residency depends on the number of UK ties you have (family, accommodation, work, 90-day, and country ties) combined with the number of days spent in the UK.
Key point: Simply leaving the UK does not automatically make you non-resident. You must satisfy the SRT conditions, and HMRC can challenge your status retrospectively if your day count or ties don't support the position you've taken.
Notifying HMRC
When you leave the UK, you should complete HMRC form P85 to notify them of your departure. If you have self-assessment obligations, you should also file a return for the year of departure. Getting your residency status formally established helps avoid complications with tax codes and UK pension tax treatment.
Split-Year Treatment
In the tax year you leave the UK, you may qualify for split-year treatment — meaning you are only taxed as a UK resident for the portion of the year before your departure. This prevents you from being taxed on your worldwide income for the entire tax year in which you emigrate.
Split-year treatment is not automatic. You must meet one of several qualifying cases set out in the SRT legislation. The most common case for expats is Case 4 — starting full-time work overseas. To qualify:
- You must start full-time work overseas and remain non-UK resident for the remainder of the tax year
- Your UK workdays must not exceed permitted limits
- You must have fewer than the permitted number of UK days in the overseas part of the year
If split-year treatment applies, your overseas income from the non-UK part of the year is outside the UK tax net, even though you were technically UK resident for part of the year.
Double Taxation Agreements
The UK has Double Taxation Agreements (DTAs) with over 130 countries, designed to prevent the same income being taxed in both countries. These treaties determine which country has primary taxing rights over different types of income — including employment income, pensions, rental income, dividends, and capital gains.
How DTAs Work in Practice
DTAs allocate taxing rights based on the type of income. Common rules include:
- Employment income: Generally taxed only in the country where the work is performed
- Pension income: Rules vary by treaty — some give exclusive rights to the country of residence, others allow the source country to tax as well
- Rental income: Usually taxable in the country where the property is located, with credit given in the country of residence
- Dividends and interest: Often subject to reduced withholding rates under treaty provisions
If you are a non-UK resident receiving a UK pension, you can apply for an NT (No Tax) code from HMRC, which prevents UK tax being withheld at source. The pension income is then taxed in your country of residence under the terms of the relevant DTA. Read more about how double taxation treaties work for UK expats.
Important: Not all DTAs are the same. Some treaties (e.g., the UK-UAE agreement) are very favourable for expats, while others create more complex reporting obligations. Always check the specific treaty for your country of residence.
Capital Gains Tax for Expats
Non-UK residents are generally not liable for UK Capital Gains Tax (CGT) on most asset disposals. However, there are important exceptions — particularly for UK residential property and for individuals who return to the UK within five years of departure.
UK Residential Property
Since April 2015, non-UK residents pay CGT on gains arising from the disposal of UK residential property. The rates are the same as for UK residents (18% and 24% as of 2026). Non-residents must report and pay any CGT due within 60 days of completion using the HMRC Capital Gains Tax on UK Property service.
The Temporary Non-Residence Rules
If you leave the UK and return within five complete tax years, gains realised during your absence may be taxed as if you had been UK resident throughout. This anti-avoidance rule prevents individuals from leaving briefly to sell assets tax-free. The rule applies to gains on assets held before departure. For a deeper dive, see our guide to capital gains tax for UK expats.
Shares and Other Assets
For non-property assets (shares, funds, crypto), genuine non-UK residents with no intention of returning within five years can sell free of UK CGT. However, you may owe CGT in your country of residence depending on local rules.
UK Income Tax for Expats
Even as a non-UK resident, you may still owe UK income tax on certain types of UK-source income. The most common categories affecting expats are rental income from UK property, UK employment income, and certain types of investment income.
UK Rental Income
If you own UK property and rent it out while living abroad, the rental income is taxable in the UK regardless of your residence status. Letting agents are required to withhold basic-rate tax (20%) from rental payments to non-resident landlords unless you register with HMRC's Non-Resident Landlord Scheme (NRLS). Under the NRLS, you can receive rent gross and account for tax through self-assessment. Read our detailed guide on UK rental income tax for non-resident expats.
UK Employment Income
If you perform any work duties in the UK while resident abroad, the income attributable to those UK workdays is generally taxable in the UK. Short business trips to the UK can create UK tax obligations, although DTAs may provide relief in some circumstances.
Investment Income
UK bank interest, UK dividends, and other UK-source investment income may or may not be taxable depending on your residency status and the relevant DTA. Many DTAs reduce or eliminate UK withholding on dividends and interest for non-residents.
Inheritance Tax for Expats
UK Inheritance Tax (IHT) is based on domicile, not residence — and changing your domicile of origin is extremely difficult. If you are UK-domiciled (or deemed domiciled), your worldwide estate is subject to UK IHT at 40% above the nil-rate band (currently £325,000), regardless of where you live.
Domicile vs. Residence
Domicile is a different concept from tax residence. Your domicile of origin is typically the country your father considered his permanent home when you were born. To acquire a new domicile of choice, you must demonstrate both physical residence in a new country and a clear intention to remain there permanently or indefinitely — with no intention of returning to the UK.
Deemed Domicile Rules
Even if you have technically changed your domicile, HMRC's deemed domicile rules mean you are treated as UK-domiciled for IHT purposes if you have been UK resident in at least 15 of the previous 20 tax years. This means long-term UK residents who emigrate may need to spend many years abroad before escaping the UK IHT net.
Pensions and IHT from April 2027
From April 2027, UK pensions will fall within the IHT estate. This is a significant change — previously, most pension funds could be passed to beneficiaries outside the IHT net. Expats with large UK pension pots and UK-domiciled status should review their estate planning urgently. See our guide on retiring abroad from the UK for more context.
Key planning point: The interaction between domicile, residence, and the location of your assets creates one of the most complex areas of expat tax planning. Professional advice is essential — particularly for estates involving property, pensions, and investments across multiple jurisdictions.
Why Professional Expat Tax Planning Matters
Cross-border tax planning is not a DIY exercise. The interaction between UK tax rules, your country of residence's tax system, applicable DTAs, and evolving legislation (such as the 2027 pension IHT changes and the abolition of the non-dom regime) creates layers of complexity that general accountants rarely encounter.
Getting it wrong can be expensive. Common mistakes include:
- Assuming you are automatically non-UK resident when you haven't satisfied the SRT
- Failing to report UK property gains within the 60-day deadline
- Not applying for an NT tax code and having pension income taxed at source unnecessarily
- Returning to the UK within five years and triggering the temporary non-residence rules on capital gains
- Ignoring domicile status and the IHT implications for your worldwide estate
- Missing the interaction between FATCA/CRS reporting requirements and your tax obligations
A specialist cross-border adviser understands how these rules interact across jurisdictions and can help structure your affairs to be tax-efficient, compliant, and aligned with your long-term plans.
Key UK Tax Considerations for Expats: Summary
| Tax Type | Basis | Key Rule for Expats |
|---|---|---|
| Income Tax | Residence | Non-residents taxed on UK-source income only |
| Capital Gains Tax | Residence | Non-residents pay CGT on UK property; 5-year return rule applies |
| Inheritance Tax | Domicile | UK-domiciled = worldwide estate liable at 40% |
| Pension Tax | DTA-dependent | Usually taxed in country of residence; apply for NT code |
| Rental Income | Source | Always taxable in the UK; register for NRLS |
Find a Financial Adviser for Expats
Navigating UK tax as an expat requires specialist cross-border expertise. FindExpatWealth connects internationally mobile UK citizens with regulated financial advisers who understand how UK and overseas tax systems interact.