United Kingdom – Taxation

How does the tax system in the UK work?

The UK’s tax framework is administered at a national level. In contrast to federal systems — such as those found in the United States, Canada, or Australia, where taxation is divided between central and state or provincial governments — the primary machinery of UK taxation is managed nationally by HM Revenue & Customs (HMRC). Scotland holds certain devolved powers over income tax rates, which means Scottish taxpayers are subject to a somewhat different rate structure compared to residents of England, Wales, and Northern Ireland, though the broader legislative framework remains under Westminster’s control.

The Statutory Residence Test (SRT) is the body of rules used to establish an individual’s residency status for tax purposes, and therefore their obligation to file a UK tax return and pay UK taxes on worldwide assets and income. The SRT governs determinations of UK residence for tax years from 2013/14 onwards. Understanding this test thoroughly — both before and after relocating to the UK — is essential for any incoming expat.

The SRT is applied sequentially and is structured around three components: conditions under which a person is automatically treated as UK resident; conditions under which a person is automatically treated as non-resident; and the “sufficient ties” test, where residency is established by weighing the number of ties a person has to the UK against the number of days spent there. These components must be considered in order.

Anyone present in the UK for 183 or more days in a tax year is automatically UK resident, with no need to examine any further tests. For those spending fewer days in the UK, automatic non-residence will apply if at least one of the automatic overseas tests is satisfied. Automatic residence applies where none of the automatic overseas tests is met but at least one of the automatic UK tests is. Where neither set of automatic tests is conclusive, residence is determined by the sufficient ties test, which assesses the combination of connections to the UK and days spent there.

Because residence status must be self-assessed under the UK tax system, it is essential that individuals maintain adequate records to substantiate their position if HMRC ever queries it. This might include evidence of travel movements into and out of the UK, documentation of working patterns and locations, and records relating to the use and occupation of any property.

UK residents are subject to income tax on their worldwide income, whereas non-residents are taxable only on income that has its source in the UK. Most employment income is collected through the Pay As You Earn (PAYE) system, under which employers deduct both Income Tax and National Insurance contributions directly from wages and pension payments, passing these sums to HMRC throughout the year. An HMRC-issued tax code instructs employers on the precise amount to withhold. Always consult the HMRC website for the most up-to-date rates and guidance.

Does the UK have double taxation agreements, and how do they affect expats?

The UK has built up an extensive network of double tax treaties with countries around the world. Among the principal functions of these agreements is providing relief from double taxation, either by allocating the right to tax a given item of income exclusively to one country, or by permitting a credit for foreign tax already paid when computing the UK tax liability on that income.

These treaties work by apportioning the taxing rights that each country asserts under its domestic law over the same income or gains, with the objective of ensuring that the same item is not taxed in full by two jurisdictions simultaneously. In practical terms, if you are relocating to the UK from a country that has a DTA with the UK, it is unlikely that the same income will be fully taxed by both governments.

Double tax agreements typically extend to employment income, pensions, rental income, dividends and interest, business profits, and capital gains, and each treaty sets out which country holds taxing rights over each category. It is worth noting, however, that double taxation agreements do not apply to tax on gains arising from the disposal of UK residential property.

Where an individual is regarded as resident in two countries at the same time, treaty residence is usually resolved by working through a series of “tie-breaker” tests set out in the applicable DTA. As a general rule, treaty residence will be in the country where you have a permanent home, though if you maintain a home in both countries it may be necessary to identify which represents your “centre of vital interests.”

Form DT-Individual, available to non-residents wishing to claim UK tax relief, enables you to apply under the relevant DTA for relief at source. Relief can also be claimed through the self-assessment tax return. Where no treaty exists between the UK and your country of residence, you may be able to seek unilateral relief from HMRC, or you may need to rely on whatever provisions your country of residence makes available.

The complete and current list of UK tax treaties is published by HMRC on the GOV.UK tax treaties page. You should always consult the text of the specific treaty that applies to your situation, as individual agreements differ considerably in the types of income they cover and the degree of relief they offer.

What taxes do expats need to pay in the UK?

Once you are tax resident in the UK, a number of taxes may apply to you. The following sets out the most significant ones for expats to understand.

Income Tax

Income below the personal allowance is not subject to tax. For 2025/26, the personal allowance stands at £12,570. It has remained at this level since April 2022 and is scheduled to stay there until April 2028. Where your adjusted net income exceeds £100,000, the personal allowance is reduced by £1 for every £2 above that threshold, falling to zero entirely once income reaches £125,140.

The following rates apply for England, Wales, and Northern Ireland (as of 2025/26):

A different structure applies to residents of Scotland, where the Scottish Parliament sets its own income tax rates. Consult the HMRC income tax rates page for current figures and for information on Scottish rates.

National Insurance Contributions (NICs)

National Insurance is the UK’s social security contribution mechanism — broadly analogous in purpose to social insurance schemes in countries such as France or Germany, though structured differently. For 2025/26, the main employee NIC rate stands at 8%, having been cut from 12% to 10% at the 2023 Autumn Statement and then further reduced to 8% at the 2024 Spring Budget. This main rate applies to earnings between the primary threshold (£242 a week) and the upper earnings limit (£967 a week).

Employers are also required to pay NICs at 15% on earnings above the secondary threshold, which is set at £96 per week. Self-employed individuals are subject to different NIC classes; check with HMRC for the rates currently applicable to the self-employed.

Capital Gains Tax (CGT)

Capital Gains Tax is charged on the profit realised when you sell or otherwise dispose of an asset that has risen in value, after deducting your tax-free Annual Exempt Amount. Gains that fall within the unused portion of your basic-rate band are taxed at 18%, while gains above that threshold attract a rate of 24%. These rates apply consistently to shares, cryptocurrencies, residential property, and most other chargeable assets held by individual taxpayers. Always verify the current annual exempt amount on the HMRC CGT page, as it is subject to change.

Inheritance Tax (IHT)

The UK charges Inheritance Tax at 40% on the portion of an estate exceeding the nil-rate band (£325,000 as of 2025/26 — confirm current thresholds with HMRC). Under reforms effective from 6 April 2025, you will be treated as a Long-Term Resident for IHT purposes if you have been UK tax resident in at least 10 of the preceding 20 tax years, as assessed using the Statutory Residence Test. Long-term residents accordingly face IHT exposure on their worldwide assets, not merely those situated in the UK. IHT treaties are in place with only a small number of countries, making this a particularly important consideration for expats with substantial overseas holdings.

Property Taxes

Buyers of property in England and Northern Ireland are subject to Stamp Duty Land Tax (SDLT), with equivalent levies applying in Scotland and Wales. Rates are graduated and depend on the property’s value, the buyer’s residency status, and whether the buyer already owns other property. Rental income generated from UK property is taxable as income at your marginal rate, following allowable deductions. Consult the HMRC SDLT guidance for current rates and any surcharges applicable to overseas buyers.

The UK does not impose a general annual wealth or net worth tax, setting it apart from countries such as Norway or Switzerland. There is similarly no standalone gift tax, though gifts can carry IHT consequences depending on their timing and value.

Are there any tax breaks or special regimes for expats in the UK?

A fundamental change to the UK’s tax treatment of new arrivals came into effect on 6 April 2025. The basis on which individuals are taxed in the United Kingdom shifted significantly from that date. The role of domicile in determining the scope of an individual’s UK tax liability was largely abolished, replaced by a new residence-based framework, accompanied by transitional provisions intended to ease the adjustment for those affected by the changes.

The Foreign Income and Gains (FIG) Regime

Under the FIG regime, qualifying new arrivals are not required to pay UK tax on their foreign income and gains, and may bring those funds into the United Kingdom freely. There is, however, an obligation to report to HMRC any amounts in respect of which the exemption is being claimed. In practice, if you have lived outside the UK for 10 or more consecutive years, you may designate overseas earnings during your first four years of UK residence as FIG, attracting no UK tax liability on those amounts.

The FIG regime is conceptually comparable to Portugal’s former Non-Habitual Resident scheme or Italy’s flat-tax arrangement for new residents, in that it offers a time-limited window of reduced tax exposure on foreign-source income to individuals who are internationally mobile. However, unlike those flat-rate mechanisms, the UK FIG regime fully exempts qualifying foreign income during the first four years of UK tax residence rather than subjecting it to a reduced fixed rate.

Overseas Workday Relief (OWR)

Overseas Workday Relief is available to eligible employees during their first four years of UK tax residence, provided they also qualify for the FIG regime. It applies to employment income attributable to duties performed outside the UK. The relief is subject to an annual monetary cap, set at the lower of £300,000 or 30% of “relevant qualifying employment income” per tax year, giving a maximum total relief of £1.2 million over the four-year period.

Temporary Repatriation Facility (TRF)

The Temporary Repatriation Facility provides a three-tax-year window — covering 2025/26, 2026/27, and 2027/28 — during which historic (pre-6 April 2025) unremitted income and gains may be brought to the UK at a reduced tax rate. This is a transitional measure aimed at those who previously held funds offshore under the old remittance basis regime. Given the complexity and time-limited nature of this facility, specialist advice is essential for anyone to whom it may be relevant.

All of these provisions are subject to detailed eligibility conditions, and the rules are relatively new. Always consult the HMRC guidance on residence and the FIG regime and seek qualified professional advice before relying on any of these measures.

How and when do expats file a tax return in the UK?

The current UK tax year spans 6 April 2025 to 5 April 2026. This April-to-April cycle is one of the more distinctive features of the UK system; most countries align their tax year with the calendar year. Australia also uses a non-calendar tax year — running from 1 July to 30 June — but the UK’s particular timing has its own historical origins.

Employees whose sole source of income is processed through PAYE may not need to file a Self Assessment tax return. However, expats who receive foreign income, have multiple income streams, are self-employed, or wish to claim reliefs such as the FIG regime will generally be required to file. The process works as follows:

1. Register for Self Assessment: Inform HMRC that you are required to submit a tax return by registering online through the GOV.UK Self Assessment registration page. Do this as early as possible — ideally before the conclusion of the tax year in which you first become liable to file.
2. Gather your records: Assemble details of all income received throughout the tax year, covering employment income, foreign income, rental receipts, dividends, and capital gains. Retain documentation for any expenditure you plan to claim as a deduction.
3. Complete your tax return: A Self Assessment return requires you to declare income from all sources and any allowable deductions or reliefs following the close of the tax year. HMRC uses this information to calculate the amount of tax due.
4. Submit the return: The deadline for paper Self Assessment returns is 31 October, while online submissions must be made by 31 January following the end of the tax year. Filing online through the HMRC portal is strongly encouraged and is the more straightforward option.
5. Pay any tax owed: Outstanding tax must be settled by 31 January following the end of the relevant tax year. Delays attract both interest and surcharges, so timely payment is important.
6. Make Payments on Account if applicable: Where your Self Assessment liability exceeds £1,000, HMRC will require you to make advance contributions — known as Payments on Account — towards the next year’s bill, typically split into two instalments due on 31 January and 31 July.

Failing to submit a Self Assessment return on time results in an automatic £100 penalty, with escalating daily charges and percentage-based penalties for returns that remain outstanding over longer periods. Consult the HMRC Self Assessment page to confirm current deadlines, and consider engaging a tax adviser with experience of cross-border and expatriate matters — particularly in your first year of UK residence.

From April 2026, the government intends to implement Making Tax Digital for income tax, initially affecting self-employed individuals and landlords with qualifying income above £50,000, who will be required to submit records digitally on a more regular basis throughout the year. Expats falling within these categories should familiarise themselves with this forthcoming change.

What are the tax implications of leaving the UK?

If you have been UK tax resident and subsequently relocate, there are several significant obligations and potential pitfalls to keep in mind. Unlike the United States, which taxes its citizens on worldwide income regardless of where they live, the UK operates an exclusively residence-based system — so ceasing to be UK tax resident is the key event that curtails ongoing UK tax exposure.

Establishing non-residency: On leaving the UK, you should formally notify HMRC by completing form P85 (“Leaving the UK — getting your tax right”). As a general rule, an individual is either UK resident for the entirety of a tax year or not at all. Where, however, an individual arrives in or departs from the UK partway through a tax year, split year treatment may apply, designating a portion of the year as an “overseas part” for which the individual is treated as non-UK resident.

The Temporary Non-Residence rule: If you were UK resident in four or more of the seven years preceding your departure and remain non-resident for fewer than five years, any return to the UK will trigger a charge to tax on worldwide gains and certain income accrued during your absence — including returns from overseas investments and director loans. This rule is a critical planning consideration for anyone contemplating a temporary period abroad.

Inheritance Tax after departure: The new residence-based IHT regime (in force from April 2025) imposes a “tail” of between three and ten years after leaving the UK: those who have been long-term UK residents — resident for ten or more of the preceding twenty years — remain exposed to 40% IHT on their worldwide assets during this period. A continuous absence of ten years clears the maximum tail, after which IHT applies only to assets situated in the UK, such as property and shares.

Ongoing UK income: Non-residents continue to be liable to UK tax on income arising in the UK — most commonly from rental income on UK property, employment income for days worked in the UK, and certain UK pension receipts. UK Self Assessment returns should continue to be filed for as long as you have UK-source income above the relevant reporting thresholds.

The rules surrounding departure are genuinely complex, and the consequences of errors — particularly in relation to the new IHT tail provisions — can be severe. Specialist advice before leaving the UK is strongly advisable for anyone with substantial assets or income streams.

Practical tips for managing taxes as an expat in the UK

• Keep meticulous records of your days in the UK from the outset. You are ordinarily treated as having spent a day in the UK if you are present there at midnight. Maintaining a detailed log of all arrivals and departures is essential, as these day counts directly determine your SRT outcome.
• Think carefully about when you arrive. Because the UK tax year runs from 6 April, choosing to arrive early in the tax year — rather than partway through — may help maximise the number of complete years for which you can benefit from the FIG regime. Pre-arrival tax planning with a specialist is well worth the investment.
• Establish whether the FIG regime applies to you. Eligibility requires at least ten consecutive years of non-UK residence prior to arrival. Both incorrectly claiming the relief and failing to claim it when entitled can prove costly. Ensure that any FIG claims are reported to HMRC as required.
• Make active use of applicable double tax treaties. Before concluding that you owe tax in two countries on the same income, check whether the UK holds a treaty with your home country and what it provides in respect of your particular income types. Pension income, in particular, is frequently treated in diverging ways across individual treaties.
• Retain thorough documentation of all foreign income and assets. Even where amounts are exempt under the FIG regime, HMRC requires you to report the sums on which you are claiming the exemption. Comprehensive records afford protection in the event of any enquiry.
• Take advice before disposing of assets. Selling assets — especially overseas investments or UK property — can generate CGT liabilities that are difficult or impossible to reverse after the fact. Careful consideration of timing relative to the tax year can make a material financial difference.
• Work with a specialist in cross-border taxation. The interplay between UK tax law, your home country’s tax system, and the relevant double tax treaties is genuinely intricate. A qualified adviser with recognised expertise in international and expatriate tax matters — seek a member of the Institute of Chartered Accountants in England and Wales (ICAEW) or the Chartered Institute of Taxation (CIOT) — can deliver real savings and help you avoid expensive errors.
• Stay alert to legislative developments. The changes to the domicile, residence, Inheritance Tax, and non-dom rules that came into effect on 6 April 2025 represent a sweeping overhaul of the UK’s international tax landscape, with provisions that could catch unwary expats off guard. Monitor the HMRC website regularly for any further updates.

Frequently Asked Questions

When do I become a UK tax resident?

Spending 183 or more days in the UK during a tax year automatically makes you UK resident. For those present for fewer days, the outcome turns on the Statutory Residence Test’s automatic overseas and UK tests, and ultimately on the “sufficient ties” test, which balances connections to the UK — such as family, accommodation, and employment — against the number of days spent there. The SRT must be worked through in a defined sequence, and professional advice is recommended wherever the position is not straightforward.

Does the UK tax my worldwide income?

UK tax residents are liable to income tax on their worldwide income, while non-residents are taxed only on income that arises within the UK. That said, newly arrived individuals who qualify for the Foreign Income and Gains (FIG) regime — a status that requires at least ten years of prior non-UK residence — may exclude foreign income and gains from UK tax for the first four years following their arrival.

What is the UK tax year, and when are returns due?

The UK tax year runs from 6 April through to 5 April the following year. Self Assessment returns must be filed by 31 October for paper submissions or by 31 January for online filings, in each case following the end of the relevant tax year. Any tax due must also be paid by the 31 January deadline to avoid interest charges and penalties.

How is foreign pension income taxed in the UK?

Foreign pension income is generally brought into charge to UK income tax once you are resident here, but the precise treatment frequently depends on the double taxation agreement between the UK and the country from which the pension is paid. Some treaties grant exclusive taxing rights to the source country, while others confer them on the country of residence. HMRC’s “Double-taxation digest” sets out the position for countries that have an agreement with the UK and how income such as pensions and interest is treated. You should always refer to the specific treaty text for your country of origin.

Are there National Insurance contributions for expats?

Employment or self-employment in the UK will generally give rise to National Insurance Contributions (NICs). The main employee NIC rate is 8% for 2025/26. The UK has concluded social security agreements with a number of countries, and these may affect the country in which contributions are payable for individuals on temporary assignments to the UK. Consult the HMRC guidance on international social security for details relevant to your circumstances.

Is there an exit tax when I leave the UK?

The UK does not currently impose a formal exit charge on unrealised capital gains of the kind levied by some other countries — for example, Germany’s exit tax on certain shareholdings. However, the Temporary Non-Residence rules are an important consideration: if you were UK resident in four or more of the seven years before departure and you return to the UK within five years, gains and certain income that accrued during your absence can become taxable on your return. You should also submit a final Self Assessment return for the tax year in which you depart, where one is required.

Can I get tax relief if I pay tax in both the UK and another country?

Where two countries seek to tax the same income, there are established mechanisms to prevent the full burden falling twice. The first step is to examine whether the double tax agreement between the UK and the other country allocates exclusive taxing rights to one side. Where it does not, unilateral relief may be available as a fallback. In practice, the effect is that you will generally pay the higher of the two countries’ rates on the income in question, rather than both rates in full.

Do I need a tax adviser when moving to the UK?

Although there is no legal requirement to engage a tax adviser, professional guidance is strongly recommended for the vast majority of expats. The SRT involves numerous specifically defined terms and concepts, making it important for each person to consider the rules carefully in the context of their own situation and to take appropriate professional advice. The first year of residence is particularly critical, when questions of residency status, FIG eligibility, and split-year treatment all demand close attention. Look for an adviser who is a member of the Chartered Institute of Taxation (CIOT) or belongs to a regulated firm with demonstrable expertise in international tax matters.