Tax Implications of Working Abroad as a UK Self-Employed Person

The Accounted Business Team·14 February 2026·7 min read

Working abroad while running a UK self-employed business has become increasingly common. Whether you spend winters in Spain, work remotely from Portugal for a few months, or take on a contract overseas, your UK tax obligations do not simply disappear when you leave the country. The rules around tax residency, split year treatment, and international tax are some of the most complex areas of the UK tax system.

This guide covers the key considerations for UK self-employed people who work abroad, including how residency is determined, what happens to your UK tax liability, and how double taxation treaties prevent you from being taxed twice.

The Statutory Residence Test (SRT)

Your UK tax position when working abroad depends primarily on whether you are UK tax resident. Since April 2013, this has been determined by the Statutory Residence Test (SRT), set out in Schedule 45 of the Finance Act 2013.

The SRT consists of three parts, applied in order:

Part 1: Automatic Overseas Test

You are automatically non-resident if you meet any of these conditions:

You were UK resident in one or more of the previous three tax years and you spend fewer than 16 days in the UK in the current tax year
You were not UK resident in any of the previous three tax years and you spend fewer than 46 days in the UK in the current tax year
You work full-time overseas with no significant breaks, and you spend fewer than 91 days in the UK, of which fewer than 31 are working days

Part 2: Automatic UK Test

You are automatically UK resident if you meet any of these conditions:

You spend 183 days or more in the UK in the tax year
Your only home is in the UK for at least 91 consecutive days, with at least 30 of those falling in the tax year
You work full-time in the UK for any period of 365 days, with at least one day falling in the tax year

Part 3: Sufficient Ties Test

If neither the automatic overseas test nor the automatic UK test applies, you use the sufficient ties test. This considers your UK ties (family, accommodation, work, 90-day presence in prior years, and country tie) alongside the number of days you spend in the UK.

The more ties you have, the fewer days you need to spend in the UK to be considered resident. For example, if you have four UK ties and were resident in any of the previous three years, spending just 46 days in the UK would make you resident.

What UK Tax Residency Means

If You Are UK Resident

UK residents are taxed on their worldwide income. This means all your self-employment profits — regardless of where you earn them — are subject to UK income tax and National Insurance. Working from a beach in Bali does not change your UK tax position if you remain UK resident.

If You Become Non-Resident

If you leave the UK and become non-resident for the full tax year, you are generally only taxed on UK-source income. Self-employment income earned entirely overseas would not normally be subject to UK tax.

However, there are important exceptions:

Income from a UK trade (one carried on wholly or partly in the UK) may still be taxable
UK rental income remains taxable regardless of your residency
UK employment income for duties performed in the UK is taxable

Split Year Treatment

If you leave or arrive in the UK partway through the tax year, you may qualify for split year treatment. This divides the tax year into a UK part and an overseas part, with different tax rules applying to each.

Split year treatment is not automatic. You must meet one of several specific cases set out in the legislation. The most relevant for self-employed people are:

Case 1: Starting Full-Time Work Overseas

You leave the UK to work full-time overseas and remain non-resident for the rest of the tax year. The overseas part begins when you start full-time overseas work.

Case 4: Starting to Have a Home in the UK

If you come to the UK partway through the year and establish a home here, the UK part begins from when your UK home becomes available.

Case 5: Starting Full-Time Work in the UK

You arrive in the UK to start working full-time. The UK part begins when you start working.

When split year treatment applies, your overseas income during the overseas part of the year is generally not taxable in the UK (subject to the usual exceptions for UK-source income).

To claim split year treatment, you report it on the SA109 (Residence, remittance basis etc.) supplementary pages of your Self Assessment return.

Double Taxation Treaties

The UK has double taxation agreements (DTAs) with over 130 countries. These treaties prevent the same income from being taxed in both the UK and another country.

How DTAs Work for Self-Employed People

DTAs typically allocate taxing rights based on where the business activity takes place. For self-employed income, the general position under most treaties is:

The country where the work is performed has the primary right to tax the income
The country of residence gives a credit for foreign tax paid, or exempts the foreign income from domestic tax

The Key Article: Business Profits

Most DTAs include an article on "Business Profits" (usually Article 7). Under this article, a country can only tax a non-resident's business profits if those profits are attributable to a permanent establishment in that country.

A permanent establishment generally means a fixed place of business — an office, workshop, or other fixed location through which the business is conducted. Simply working from a laptop in a co-working space for a few weeks is unlikely to create a permanent establishment, but this is a grey area that depends on the specific treaty and the facts.

Claiming Treaty Relief

If you are taxed in another country and also face UK tax on the same income, you claim relief through your UK Self Assessment return. You can claim either:

Credit relief: Reduce your UK tax by the amount of foreign tax paid (the most common approach)
Exemption: If the treaty exempts the income from UK tax

Foreign tax credit is claimed on the SA106 (Foreign) supplementary pages of your tax return.

Notifying HMRC

If you leave the UK or change your residency status, you should notify HMRC. This is done through form P85 (if you are leaving the UK) or through your Self Assessment return.

If you remain UK resident but work overseas for part of the year, you continue to file your Self Assessment return as normal, declaring your worldwide income and claiming any foreign tax credit relief.

SA109: Residence Supplementary Pages

If your residency status changes, or if you are claiming split year treatment, you must complete the SA109 supplementary pages as part of your Self Assessment return. This form covers:

Your residency status under the SRT
Whether you are claiming split year treatment
Which case of split year treatment applies
Your remittance basis claim (if applicable)

National Insurance When Working Abroad

National Insurance rules are separate from tax residency rules. If you work in the EU/EEA or Switzerland, social security coordination rules (retained from the UK-EU Trade and Cooperation Agreement) determine where you pay contributions.

Generally, you pay social security contributions in one country only — usually the country where you work. If you are temporarily posted to work in another country but remain ordinarily employed or self-employed in the UK, you can obtain a Certificate of Coverage (A1 form) from HMRC to continue paying UK NICs and be exempt from the other country's social security.

For non-EU countries, the position depends on whether the UK has a bilateral social security agreement with that country. Without an agreement, you could face double social security contributions.

Let Accounted Keep You Compliant

International tax can be complicated, but your day-to-day bookkeeping does not have to be. Accounted tracks your business income and expenses wherever you are working, and Penny, your AI bookkeeper, helps ensure everything is properly categorised and ready for your Self Assessment return — including flagging where foreign income may need separate reporting. Start your free trial and keep your UK tax affairs in order while you work from anywhere.

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