Expat Tax Returns

Knowing which income to pay tax on, to which country, and when, are the questions we deal with daily. For expats, the answers are rarely obvious, and the consequences of getting them wrong can be both costly and time-consuming to resolve. As a tax agent to expats living in the UK or elsewhere, we are here to guide you through the UK’s Self-Assessment tax declaration process. We help you remain compliant with HMRC, wherever you reside, with the support you need to obtain relief from double taxation when exposed to tax in more than one country.

We help identify what needs to be declared

Whether it’s rental income, income from property sales, cross-border business earnings, including salaries and dividends, or pension income, knowing the correct tax position is key.

For expats, the rules are not straightforward, especially when multiplied across jurisdictions. Take, for example, pension income paid by the UK and received in another country. In many cases, if your country of residence has a tax treaty with the UK, you may only need to pay tax to your country of residence and not to the UK. To make it more complicated, different pensions are taxed differently across countries. Furthermore, both countries may have the right to tax the same income. In these cases, we will assist by operating the legislative mechanisms in place to prevent double taxation within the relevant deadlines.

Tax Residence

For most expats, the question of residence sits at the back of their mind, often unresolved. Whether you are coming to the UK or leaving, your residence status is the starting point for almost every UK tax question. It determines whether you are taxable on your worldwide income or on your UK income alone, and it has a direct bearing on several income streams that catch many expats by surprise.

A UK resident receiving rental income from an overseas property, for example, must declare that income to HMRC in full. A non-resident in the same position would have no such obligation. Similarly, a UK resident working entirely overseas for a UK employer remains taxable in the UK on those earnings, while a non-resident doing identical work would not.

Prior to 6 April 2013, determining residence status was an uncertain process, relying heavily on case law and HMRC guidance that did not always provide clear answers. The introduction of the Statutory Residence Test under Finance Act 2013, Schedule 45 changed that. While the test is detailed and its application requires careful consideration of your individual circumstances, it does at least provide a legally certain framework.

For further explanation of how the Statutory Residence Test works and how it may apply to your situation, please see our <dedicated SRT page>.

Tax Filing Obligations

Once we confirm you are a UK taxpayer, we will guide you through the registration process and prepare and file your tax return online, in accordance with the latest requirements and timelines. We will also assist with any claims for relief and allowances where possible, and advise you of any ways you can legally mitigate your tax bill.

What documents do I need?

In preparation for the reporting process, the following information and documentation should be considered as necessary.

• A Unique Taxpayer Reference number (UTR), otherwise known as the UK’s tax identification number,
• a National Insurance number. If no National Insurance number is available, which is usually required to obtain the UTR, we can assist with obtaining the UTR directly.
• Details of your UK and foreign employment, pension and investment income.
• Ownership details of rental properties and corresponding income data, such as annual rental statements and annual mortgage interest reports.
• Documentation for capital gains, such as completion statements for property sales.
• Details of taxes paid abroad if claiming Foreign Tax Credits, and
• Your bank account information for any HMRC refunds.

When prepared in advance, such data and documentation help ensure completeness, accuracy and timeliness in filing your tax return, which is always highly recommended.

Deadlines and penalties

The UK tax year runs from 6 April to 5 April the following year. For those within Self-Assessment, the deadline for filing your online tax return and paying any tax owed is 31 January following the end of the tax year, so for the 2024/25 tax year, that deadline falls on 31 January 2026. Missing this deadline is something we always work hard to help our clients avoid.

HMRC imposes an immediate £100 penalty for a late return, with further daily penalties of £10 applying after three months, and additional percentage-based surcharges on any unpaid tax after six and twelve months. The penalties escalate quickly and can easily exceed the original tax liability if left unaddressed.

We manage the entire filing process on your behalf, keeping you well ahead of every deadline so that none of this becomes your concern.

How we help

Managing UK tax obligations from abroad is a complex area of taxation, and the consequences of getting it wrong – whether through a missed deadline, an incorrect declaration, or an overlooked relief – can be both costly and stressful to resolve.

We take that burden entirely off your shoulders. From registering you within Self-Assessment and obtaining your UTR, through to preparing and submitting your return and corresponding with HMRC on your behalf, we handle every step of the process with care and precision. If you are not sure whether you need to file a UK tax return, that is often the most important question of all, and one we are very happy to answer.

Not sure where your UK tax obligations begin and end? Get in touch, and we will give you a clear picture of exactly where you stand.