Working Overseas as a UK Resident -- Tax Implications 2026

An increasing number of UK workers take on overseas roles -- whether through secondments, remote working arrangements, or full relocation. When you remain a UK resident while working abroad, the UK tax system follows you. Your overseas salary, bonuses, and benefits are all within the scope of UK income tax and National Insurance. Understanding how double tax relief works, what treaties apply, and what obligations fall on you and your employer can make a significant difference to your overall tax position.

UK Resident and Worldwide Income

The starting point is residence. The UK uses a Statutory Residence Test (SRT) to determine whether you are UK tax resident in any given tax year. The SRT is a detailed set of rules based on the number of days you spend in the UK, your connection to the UK, and your employment patterns.

If you remain UK resident -- for example because you only spend part of the year overseas and do not meet the non-residency conditions -- you are taxable in the UK on your entire worldwide income. This includes your overseas employment income, even if it is paid by a foreign employer into a foreign bank account and taxed locally in the country where you work.

The 2026/27 income tax rates apply to your worldwide income: the personal allowance is GBP 12,570, with basic rate tax at 20% up to GBP 50,270, higher rate at 40% up to GBP 125,140, and additional rate at 45% above GBP 125,140. Employee National Insurance applies at 8% on earnings between GBP 12,570 and GBP 50,270, and 2% above.

Double Tax Relief -- Claiming a Foreign Tax Credit

The principal mechanism for avoiding double taxation on overseas employment income is the foreign tax credit (FTC), also called double tax relief. Under UK domestic law, where you have paid income tax overseas on income that is also taxable in the UK, you can generally offset the overseas tax paid against your UK tax liability on the same income.

The credit is limited to the lower of the overseas tax paid and the UK tax due on that income. This means you never get back more UK tax than you paid overseas -- you simply prevent paying tax twice on the same income. If the overseas rate is higher than the UK rate, you cannot claim a repayment of the excess overseas tax from HMRC.

The FTC is claimed on your self-assessment return, typically on the SA106 Foreign pages. You declare the foreign employment income in full and then claim the credit for overseas tax paid.

Double Tax Treaties

Beyond domestic relief, the UK has double tax treaties with over 130 countries. These treaties generally determine which country has the primary right to tax employment income and can override the domestic rules.

Under most treaties based on the OECD model, employment income is taxable in the country where the work is physically performed, unless the employee is present in that country for fewer than 183 days in a 12-month period, the employer is a resident of the home country, and the cost of the salary is not borne by a permanent establishment of the employer in the work country. Where all three conditions are met, the home country retains taxing rights.

Some key treaty arrangements for UK residents:

United States: The UK-US treaty allocates employment income to the country where the work is performed. US income tax is generally creditable against UK tax. State taxes can also be creditable in some circumstances.

Germany: Under the UK-Germany treaty, employment income is taxable where the work is performed. Germany applies relatively high income tax rates, which typically means full UK credit is available with little or no residual UK liability.

Australia: The UK-Australia treaty follows similar principles. Australia operates a payroll withholding system and UK residents on secondment there will typically have Australian tax withheld, which is then credited in the UK.

UAE: The UAE has no personal income tax. There is a UK-UAE double tax treaty, but because UAE imposes no income tax, there is no foreign tax credit to claim. A UK resident working in the UAE must pay UK income tax on their UAE salary in full, which surprises many workers who assume they will benefit from the UAE's zero-tax environment.

Notifying HMRC -- Form P85

When you start working abroad or leave the UK to work overseas, you should complete and submit form P85 to HMRC. This form gathers information about your intentions, the nature of your overseas work, and any income you will continue to receive in the UK.

Submitting P85 serves several purposes: it allows HMRC to update your PAYE coding, it may result in a tax refund if you have overpaid through PAYE before leaving, and it starts the process of establishing your tax position abroad.

P85 is not required if you are simply taking a short overseas assignment while remaining on a UK payroll. It is most relevant where you are moving abroad for an extended period, your employer is changing your payroll arrangements, or you are leaving UK employment entirely.

National Insurance Contributions Abroad

NI obligations when working overseas depend on the country involved, the applicable agreement, and how long you are working abroad.

EEA countries and social security agreements: The UK retains social security agreements with many EEA countries following Brexit. Where an agreement applies, either UK NI or the foreign country's social security contributions are payable -- not both. Your employer should obtain an A1 certificate (or equivalent) confirming which country's system applies.

Countries without a social security agreement: If you are working in a country with which the UK has no social security agreement, both UK NI and the local social security contributions may be due, leading to genuine double social security contributions. Some countries have bilateral arrangements that limit this.

Protecting State Pension entitlement: If you stop paying UK NI while working abroad, gaps in your NI record may affect your State Pension entitlement. You can pay voluntary Class 2 NI contributions (for the self-employed rate) or Class 3 NI contributions to fill gaps. Class 2 voluntary NI is significantly cheaper than Class 3 where you qualify.

Split-Year Treatment

If you leave the UK partway through a tax year and cease to be UK resident, split-year treatment can apply. Under the SRT, there are specific cases where a split-year is available -- for example, Case 1 (starting full-time work abroad) or Case 4 (leaving to join a partner who has already left the UK).

Where split-year treatment applies, the tax year is divided into a UK-resident part and a non-resident part. Income arising during the non-resident part -- including overseas employment income -- is generally not subject to UK income tax.

Split-year treatment does not apply automatically -- it must be claimed, and the conditions of the relevant case must be met precisely. The SRT notes and HMRC guidance (RDR3) are detailed, and professional advice is recommended where the split-year position is material.

Employer Reporting Obligations and Shadow Payroll

When a UK employer sends an employee to work overseas, there are employer-level obligations as well as individual tax requirements.

Where the employee remains on the UK payroll and is physically working abroad, the employer continues to operate PAYE and deduct UK income tax and NI in the normal way. The employer may also need to comply with payroll requirements in the overseas country -- leading to what is sometimes called a split payroll or dual payroll arrangement.

A shadow payroll is a notional payroll run in one country to mirror the actual payroll run in another. For example, a UK employee seconded to Germany may be put on a German payroll to comply with German payroll withholding requirements, while the UK employer runs a shadow payroll to calculate and track UK PAYE obligations. The shadow payroll does not result in a second payment -- it is an accounting and reporting exercise.

Shadow payrolls are administratively complex and typically require specialist payroll and tax advisers in both countries.

Tax Equalisation Policies

Many multinational employers operate a tax equalisation (tax eq) policy for internationally mobile employees. Under tax eq, the employer ensures that the employee pays neither more nor less tax than they would have paid had they stayed in their home country throughout.

In practice, this means the employer absorbs any additional tax burden arising from the overseas assignment and provides refunds where the overseas arrangement results in lower tax. Tax eq simplifies planning for the employee but requires careful administration by the employer to avoid unintended tax charges on the equalisation payments themselves.

HMRC regards tax eq payments made by an employer to cover an employee's tax liability as a taxable benefit. This must be accounted for correctly in the shadow payroll and PAYE calculations.

PAYE Obligations for UK and Non-UK Employers

A UK employer sending an employee overseas must consider whether its UK PAYE obligations continue. Generally, a UK employer remains responsible for UK PAYE on the employee's earnings even during an overseas secondment, unless specific exemptions apply.

A non-UK employer paying a UK resident employee for work performed in the UK must also operate UK PAYE unless it is a non-resident employer without a UK presence and specific conditions are met. HMRC has tightened its approach to non-UK employer PAYE obligations in recent years, and overseas employers with even a modest UK presence -- such as a single employee working from home in the UK -- may find they have UK payroll registration requirements.

Worked Example -- UK Resident on US Secondment

Consider a UK resident software engineer earning GBP 80,000 who is seconded to a US employer for 10 months in 2026/27. She is present in the US for 300 days. The work is performed in the US. Under the UK-US treaty, the US has the primary right to tax this income. She pays US federal income tax at an average rate of around 22%, equivalent to GBP 17,600 on her GBP 80,000 salary.

Back in the UK, she files a self-assessment return. Her UK tax on GBP 80,000 (after the GBP 12,570 personal allowance) would be approximately GBP 19,432 (20% on GBP 37,700 plus 40% on GBP 29,730). She claims a foreign tax credit of GBP 17,600, leaving a residual UK liability of approximately GBP 1,832.

If she had instead worked in the UAE, there would be zero UAE tax to credit, and her full UK liability of GBP 19,432 would be payable. This is the UAE zero-tax trap that many UK residents on UAE assignments fail to anticipate.

Worked Example -- NI Gap Year While Working in Australia

A UK resident takes a two-year secondment to Sydney. She earns AUD 120,000 (approximately GBP 60,000) per year and pays Australian income tax locally. Under the UK-Australia treaty, Australia has primary taxing rights. She claims a foreign tax credit in the UK for Australian tax paid.

During the two years, she is not paying UK NI. She has 20 qualifying years toward the State Pension, needing 35 years for the full amount. To avoid a permanent gap, she arranges to pay voluntary Class 2 NI contributions at the current rate (approximately GBP 3.45 per week), costing roughly GBP 360 per year -- a small cost to protect State Pension entitlement worth far more in the long run.

Practical Steps Before Taking an Overseas Role

Before accepting an overseas employment position, a UK resident should:

1. Confirm whether they will remain UK resident under the SRT and whether split-year treatment is available
2. Identify the applicable double tax treaty and determine which country has primary taxing rights
3. Confirm NI obligations with the employer and whether an A1 certificate is required
4. Submit form P85 to HMRC
5. Understand whether the employer has a tax eq policy and what it covers
6. Take advice on self-assessment filing obligations for the year of departure and return

Working overseas as a UK resident does not remove your UK tax obligations -- it adds a layer of complexity. Double tax relief and treaty provisions provide protection against true double taxation, but they require careful analysis of the specific country, the nature of the role, and the employer's arrangements to claim correctly.