Tax Planning for UK Expats: The Essential Guide

The UK tax system does not simply switch off when you leave the country. UK nationals living abroad face a tax position shaped by their residence status, their domicile, the nature and source of their income and gains, and the tax treaties in force between the UK and their country of residence. Understanding how these elements interact is the foundation of effective international tax planning.

Residence vs domicile: the critical distinction

Two concepts govern most of UK international tax law: residence and domicile. They are legally distinct and have very different implications.

Tax residence determines whether you are subject to UK income tax and CGT in a given tax year. Since April 2013, residence is determined by the Statutory Residence Test (SRT), which provides a structured framework based on the number of days spent in the UK, the number of "ties" you have to the UK (accommodation, family, work, and prior residence ties), and whether you meet the "automatic overseas" tests.

A UK national who leaves the UK and spends fewer than 16 days there in a tax year will generally be automatically non-resident. Someone who has been UK resident in one or more of the three preceding tax years and spends 16–45 days in the UK will need to count their ties to determine residence. The SRT is detailed and its application to individual circumstances is not always straightforward.

Domicile is a common law concept that, broadly speaking, refers to the country you consider your permanent home and intend to return to. Most UK nationals have a UK domicile of origin. Acquiring a domicile of choice in another country requires both physical presence and a genuine, settled intention to remain there indefinitely — a high threshold that many expats do not meet.

Domicile mattered enormously under the old rules, but its significance has reduced. From 6 April 2025 the UK moved to a residence-based system for both income tax and inheritance tax. The remittance basis and the concept of "deemed domicile" (the old "15 of the previous 20 tax years" test) were abolished. For IHT, exposure to UK tax on worldwide assets now turns on whether you are a "long-term UK resident" — broadly, someone who has been UK-resident in at least 10 of the previous 20 tax years — rather than on domicile. Domicile under general law still has some residual relevance (for example, in determining the application of certain double tax treaties and for individuals' succession-law position), but it no longer drives the UK tax exposure of internationally mobile individuals as it once did. See our guide on inheritance tax planning for expats for detail on this.

Non-resident income tax rules

Non-UK residents are broadly taxable in the UK on:

• Income arising in the UK (rental income from UK property, UK employment income for duties performed in the UK, UK bank interest, UK dividends)
• Pension income from a UK pension scheme, depending on treaty provisions

Non-residents are not taxable in the UK on:

• Employment income for duties performed wholly outside the UK
• Foreign bank interest
• Foreign dividends
• Most foreign investment income

Non-residents may retain entitlement to the UK personal allowance (£12,570 for 2026/27) depending on their nationality and treaty residence. EEA nationals and nationals of countries with treaties containing a personal allowance provision retain full entitlement. Others may not.

Capital gains tax for non-residents

The position on CGT for non-residents has tightened considerably since 2015:

UK residential property: non-residents have been subject to UK CGT on gains accruing from April 2015 (or the original acquisition date if later, using rebased values). Returns must be filed within 60 days of completion, regardless of whether any CGT is payable.

UK commercial property and REITs: brought within the non-resident CGT regime from April 2019.

Other UK assets (shares, non-UK property): non-residents are generally not subject to UK CGT. This creates planning opportunities around the timing of disposals — for example, selling a share portfolio while non-resident can eliminate UK CGT on the accumulated gain.

The temporary non-residence rules prevent a simple avoidance strategy: if you become non-resident and then return to UK residence within five complete tax years, gains realised during your absence on assets held before departure are taxed on return.

Offshore income and the Foreign Income and Gains (FIG) regime

The remittance basis and the non-domicile regime were abolished from 6 April 2025. Until then, non-domiciled UK residents could elect for the remittance basis — paying UK tax only on foreign income and gains remitted to the UK rather than on the arising basis — subject, after a number of years of residence, to an annual Remittance Basis Charge (£30,000 or £60,000). That regime no longer applies to new claims.

In its place, a residence-based 4-year Foreign Income and Gains (FIG) regime applies. A "qualifying new resident" — broadly, someone who has not been UK tax-resident in any of the 10 tax years immediately before arriving — is exempt from UK tax on foreign income and gains for their first four tax years of UK residence, without any charge and without needing to track remittances. From the fifth year onwards, worldwide income and gains are taxable on the arising basis.

This matters for returning UK expats: if you have been non-UK resident for at least 10 consecutive tax years, you can qualify for the FIG regime on return and benefit from four years of exemption on foreign income and gains. Note that remittances to the UK of foreign income and gains that arose before 6 April 2025 under the old remittance basis can still be taxed when brought in, and transitional rules (such as the Temporary Repatriation Facility) applied to historic balances. The technical details are complex and advice from a UK tax specialist is essential.

See our detailed guide on remittance basis and non-dom planning for more on the transition from the old regime.

Overseas workday relief

For employees who have come from abroad to work in the UK, Overseas Workday Relief (OWR) provides an exemption from UK income tax on the portion of employment income attributable to duties performed outside the UK. From 6 April 2025 OWR was reformed in line with the new FIG regime: it is now available to "qualifying new residents" (those not UK-resident in any of the previous 10 tax years) for their first four tax years of UK residence, the previous requirement to keep the earnings offshore has been removed, and the annual relief is capped at the lower of £300,000 or 30% of total qualifying employment income. This is particularly relevant for internationally mobile executives who split their working time between the UK and other countries.

Double tax treaties

The UK has one of the world's most extensive networks of double tax treaties — over 130 bilateral agreements as of 2026. Treaties serve several functions:

• Allocating taxing rights between the two countries (typically the country of residence gets first taxing rights on most income, with the source country retaining rights on some categories)
• Providing relief from double taxation through tax credits or exemptions
• Tie-breaker rules to resolve situations where someone might be resident in both countries
• Provisions on pensions, dividends, interest, royalties, and capital gains — each of which may be treated differently

Obtaining a Certificate of UK Residence from HMRC allows you to claim treaty benefits in your country of residence. This is a routine process but requires making a formal application to HMRC.

See our dedicated guide on double tax treaties for expats for detail on the treaties most relevant to UK expats.

Key planning actions for UK expats

An effective UK expat tax plan typically addresses the following:

1. Confirming non-resident status under the SRT — keeping a careful day count and understanding which ties apply to your situation
2. UK property — understanding CGT obligations on disposal and income tax on rental income; considering whether to restructure ownership
3. Timing of asset disposals — where possible, crystallising gains while non-resident (and before returning, if return is planned)
4. Pension planning — understanding the UK tax treatment of pension contributions and benefits for non-residents, and whether a QROPS transfer is appropriate (see QROPS vs SIPP guide)
5. Long-term residence and IHT review — assessing your "long-term UK resident" status under the residence-based IHT rules (broadly, UK-resident in 10 of the previous 20 tax years) and the IHT consequences for your worldwide estate, together with any residual relevance of your general-law domicile
6. Treaty analysis — identifying the relevant treaty between the UK and your country of residence and ensuring you are claiming all available relief

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This article is provided for general information only and does not constitute tax or legal advice. UK tax law is complex and changes frequently. The correct position depends on your individual circumstances. Always seek advice from a qualified tax adviser with international expertise before making decisions.

How Global Investments can help

Global Investments works with UK tax specialists and international advisers to help clients understand and manage their UK tax position as non-residents. We can help you understand the interaction between your residency, domicile, and investment structures — and refer you to appropriately qualified tax counsel for formal advice. Contact our team to arrange a review, or continue reading with our guide on tax-efficient investing for expats.