Foreign Income and UK Tax 2026/27: What Residents Must Declare

The Statutory Residence Test -- Are You UK Resident?

Your UK tax residency status determines whether HMRC can tax your foreign income at all. The Statutory Residence Test (SRT), in force since 6 April 2013, replaces earlier case-law-based tests with a structured three-tier framework.

Tier 1 -- Automatic overseas tests: you are non-resident for a tax year if you spend fewer than 16 days in the UK that year, or fewer than 46 days if you were not UK resident in any of the previous three tax years. Additionally, if you work full-time abroad with no significant UK work (fewer than 3 hours per day averaged) and spend fewer than 91 days in the UK, you are automatically non-resident. Non-residents pay UK tax only on UK-source income, not on foreign income.

Tier 2 -- Automatic UK tests: you are automatically UK resident if you spend 183 or more days in the UK in a tax year, if your only home is in the UK (and you have had it for at least 91 days), or if you work full-time in the UK for 365 days with no significant break.

Tier 3 -- Sufficient ties test: if neither automatic test applies, your status depends on combining your UK day-count with how many "UK ties" you have. The five ties are: a family tie (spouse or minor children resident in the UK), an accommodation tie (a place to stay in the UK available for 91+ days), a work tie (working in the UK for 40+ days at 3+ hours per day), a 90-day tie (spending 90+ days in the UK in either of the two previous tax years), and a country tie (spending more days in the UK than in any other single country). The more ties you have, the fewer days you need to spend in the UK before becoming resident.

Split-year treatment: if you arrive in or depart from the UK part-way through a tax year and meet certain conditions, the year is split into a UK-resident part and a non-resident part. Foreign income earned in the non-resident part is not taxable in the UK. This is highly valuable for those returning to the UK or leaving mid-year.

The End of the Remittance Basis -- What Changed from April 2025

Before 6 April 2025, UK residents who were not domiciled in the UK could elect to use the remittance basis: they paid UK tax on foreign income and gains only if and when those amounts were brought into the UK ("remitted"). This sheltered unremitted foreign wealth from UK tax indefinitely. Long-term non-doms (resident for 7+ of the previous 9 tax years) paid an annual charge of GBP 30,000 or GBP 60,000 for this privilege.

The remittance basis was abolished from 6 April 2025. From that date, all UK residents are taxed on the arising basis: worldwide income and gains are taxable as they arise, not when remitted. Domicile is no longer relevant for income tax or CGT purposes (though it remains relevant for Inheritance Tax until further reform takes effect).

Transitional repatriation: pre-April 2025 unremitted foreign income and gains accumulated under the old remittance basis could be brought into the UK at a reduced rate via the Temporary Repatriation Facility (TRF): 12% in 2025/26, 15% in 2026/27. After 5 April 2027, the TRF closes and unremitted pre-2025 amounts face standard arising-basis rates if remitted. Anyone with significant offshore accumulations should take advice urgently.

The FIG Regime -- 4-Year Foreign Income Exemption for New Arrivals

The Foreign Income and Gains (FIG) regime is the replacement for the remittance basis, targeted at genuine new arrivals rather than long-term UK-based non-doms. The FIG regime is simpler and more generous in structure -- but time-limited.

For high earners with substantial foreign income, the FIG exemption can be extremely valuable -- potentially sheltering hundreds of thousands of pounds from UK tax over 4 years. However, the trade-off (losing the personal allowance and FTCR for FIG years) means the calculation is not always straightforward. If your foreign income is modest, you may be better off not claiming FIG and instead using normal FTCR and the personal allowance.

Overseas Workday Relief (OWR) is a related relief for FIG-eligible employees who work partly abroad. Employment income attributable to overseas workdays (time spent working outside the UK) is excluded from UK tax under OWR for the same 4-year window. The relief is calculated by reference to the proportion of working days spent outside the UK. This replaces the old OWR rules that operated under the remittance basis.

Double Taxation Treaties -- How They Protect You

The UK has comprehensive double taxation agreements (DTAs) with over 130 countries. A DTA is a bilateral treaty that prevents the same income being fully taxed in two countries. DTAs generally work in two ways: by allocating taxing rights (so only one country taxes a particular type of income), or by providing reliefwhere both countries tax the same income (typically through exemption in one country or a credit in the other).

Common treaty provisions:

• Employment income is typically taxable in the country where work is performed (the source country), but the residence country may also tax it with credit relief.
• Dividends are usually taxable in the country of residence, but the source country can apply reduced withholding tax (commonly 5--15%, depending on the treaty).
• Interest is usually taxable only in the country of residence under modern treaties, though some older treaties allow source-country withholding.
• Rental income from real property is almost universally taxable in the country where the property is situated, as well as in the country of residence (with FTCR available).
• Pensions are often taxable only in the country of residence, though some treaties give taxing rights to the source country.
• Capital gains on real property are typically taxable in the country where the property is located.

Treaty residence tiebreaker: if you are regarded as resident in two countries simultaneously (a "dual resident"), the DTA contains a tiebreaker clause that identifies a single country of treaty residence. Tests are applied in sequence: permanent home, centre of vital interests (economic and personal ties), habitual abode, nationality. Treaty non-residence in the UK removes the UK's right to tax most types of foreign income.

Treaties must be actively claimed -- they do not apply automatically. For UK residents, this means completing the foreign pages (SA106) of the self-assessment return and, for some countries, filing a treaty relief claim form (e.g., form DT-Individual) with HMRC and/or the foreign tax authority to obtain reduced withholding at source.

Foreign Tax Credit Relief -- Preventing Double Taxation

Where no treaty applies, or where a treaty allows both countries to tax the same income, Foreign Tax Credit Relief (FTCR) prevents double taxation. FTCR is available under UK domestic law for any foreign income that is also subject to UK tax -- you do not need a treaty.

The FTCR cap is critical: you can never claim more credit than the UK tax attributable to that income. If the foreign tax rate is higher than the UK rate, the excess is lost -- you cannot carry it forward or offset it against other income, unless a specific treaty provision allows this. To maximise relief, it is important to attribute your expenses correctly to each income source and to ensure the foreign tax is genuine tax (not a levy, charge or social contribution that does not qualify as a "tax on income").

FTCR is claimed on the self-assessment return, supplementary pages SA106 (Foreign). You must be able to evidence the foreign tax paid -- keep tax certificates, payslips, and foreign tax assessments.

Foreign Employment Income -- UK Tax Rules

If you are UK resident and employed by a foreign employer, your earnings are taxable in the UK. The arising basis means the tax liability arises at the time the income is earned, not when it is paid into a UK account.

Employees working across borders: if your role involves working days both in the UK and abroad, a DTA will often split the taxing rights. The UK can tax the proportion of your salary attributable to UK workdays; the source country (where the foreign employer is based) can tax the proportion for days worked there. The standard apportionment is: salary x (UK workdays / total working days). Your employer may apply this in their payroll; if not, you adjust on the self-assessment return and claim FTCR for foreign tax already withheld.

No UK PAYE from foreign employer: if your overseas employer does not operate UK PAYE, you are responsible for notifying HMRC and paying tax via self-assessment. The income is taxed at the same rates: 20% on income above the personal allowance (GBP 12,570) up to GBP 50,270, 40% from GBP 50,271 to GBP 125,140, and 45% above GBP 125,140. National Insurance is also due if you are working in or for the UK. Payments on account are required if your self-assessment bill exceeds GBP 1,000.

FIG and Overseas Workday Relief: if you qualify under the FIG regime, employment income earned for days spent working outside the UK is fully excluded from UK tax under OWR. This is particularly valuable for executives and professionals who split their working time between the UK and overseas in their first 4 UK tax years.

Overseas Rental Income -- UK Reporting and Relief

Rental income from property situated outside the UK is taxable in the UK if you are UK resident. It is classified as "overseas property income" and reported separately from UK property income on the self-assessment return (SA106 pages). The same income tax rates apply (20%, 40%, 45%) and the same deductible expense principles apply.

Allowable deductions include: letting agent fees, property management costs, repairs and maintenance (not improvements), building and contents insurance, ground rent and service charges, accountancy fees related to the overseas property, and mortgage interest. From April 2020, mortgage interest relief for overseas residential property is restricted to the basic rate of income tax (20%), the same as the UK restriction. You cannot deduct the actual interest payment at the higher rate.

The overseas property income is pooled together: if you have rental losses from one overseas property, they offset profits from another overseas property in the same year. Overseas property losses cannot be offset against UK property income; they can be carried forward against future overseas property profits.

If the local country taxes the rental income, FTCR reduces your UK tax bill by the lower of the foreign tax paid and the UK tax attributable to that rental income. Local withholding tax certificates are required as evidence.

Foreign Dividends and Interest -- Tax Treatment

Foreign dividends: dividends received from overseas companies are taxed at UK dividend rates. The GBP 500 dividend allowance for 2026/27 applies to combined UK and foreign dividends. Above the allowance, the rates are 8.75% (basic rate), 33.75% (higher rate) and 39.35% (additional rate). Foreign dividends are typically received after withholding tax has been deducted in the source country. You must gross up the dividend and report the gross amount; FTCR then credits the withholding tax against your UK dividend tax bill. Many DTAs cap withholding at 15% for portfolio investors (10% in some newer treaties).

Foreign interest: interest from overseas savings accounts, bonds and other overseas sources is taxed as savings income. The Personal Savings Allowance applies (GBP 1,000 for basic-rate taxpayers, GBP 500 for higher-rate taxpayers, zero for additional-rate taxpayers). The savings starter rate of 0% applies to up to GBP 5,000 of savings income if your other taxable income is below GBP 17,570. Above the allowances and starter rate band, savings income is taxed at 20%, 40% or 45%. Foreign withholding tax on interest is creditable via FTCR.

Offshore accounts: interest arising on foreign bank accounts must be declared even if it is automatically reinvested and never transferred to the UK. HMRC receives data from over 100 jurisdictions via the Common Reporting Standard (CRS) and Automatic Exchange of Information (AEOI) -- failure to declare offshore income carries significantly higher penalties than for domestic omissions (up to 200% of the tax unpaid in serious cases).

Self-Assessment Obligations for Foreign Income

UK residents with foreign income must complete a self-assessment tax return. HMRC does not send a tax calculation automatically for foreign income -- the obligation is entirely on the taxpayer to register, file and pay. If you have not previously filed a return, you must notify HMRC by 5 October following the end of the tax year in which the foreign income arose.

The supplementary page SA106 ("Foreign") is required for all foreign income and gains. Separate boxes cover: foreign employment income, foreign pensions, overseas property income, foreign dividends and interest, foreign capital gains, and FTCR computations. If you are claiming FIG regime elections or treaty positions, additional detail is required in the white space or via an accompanying letter.

HMRC compliance: HMRC actively receives data from overseas financial institutions via CRS. Discrepancies between declared foreign income and data held by HMRC trigger enquiries. Voluntary disclosure through HMRC's Worldwide Disclosure Facility significantly reduces penalties compared to discovery by HMRC. If you have undisclosed foreign income from prior years, seeking specialist tax advice on regularisation is strongly recommended before HMRC contacts you.

Summary -- Key Points for 2026/27

• The remittance basis is abolished. UK residents are taxed on worldwide income as it arises.
• The SRT determines UK tax residence -- not nationality, passport or visa status.
• New arrivals with no UK residence in the previous 10 years can claim the FIG 4-year exemption for foreign income and gains.
• Double taxation treaties allocate taxing rights and provide relief mechanisms -- always check the specific treaty for the country in question.
• Foreign Tax Credit Relief is available without a treaty -- it reduces UK tax by the lower of foreign tax paid or UK tax on that income.
• All foreign income -- employment, rental, dividends, interest -- must be declared on a self-assessment return, even if no UK tax is due after FTCR.
• HMRC receives offshore financial data via CRS from 100+ countries -- failure to declare is likely to be detected.
• UK income tax rates in 2026/27: 20% (GBP 12,571--GBP 50,270), 40% (GBP 50,271--GBP 125,140), 45% (above GBP 125,140), with an effective 60% rate between GBP 100,001 and GBP 125,140 due to personal allowance tapering.