Leaving the UK Tax System: HMRC, Residency & What Dubai Expats Need to Know

Most countries that UK citizens move to have their own income tax systems. Moving to France or Australia means swapping UK tax for French or Australian tax. Dubai is fundamentally different because the UAE levies zero personal income tax on employment income, investment returns, or capital gains. For a UK professional earning £100,000, the difference between paying UK income tax and paying nothing is roughly £30,000 per year. Over a three-to-five year Dubai posting, this is transformative.

The catch is that the UK taxes its residents on worldwide income. If HMRC considers you still UK-resident — even after you have physically moved to Dubai — your Dubai earnings could be subject to UK income tax. The UK Statutory Residence Test (SRT) determines your tax residency status, and it is more nuanced than most people expect. It is not simply a matter of spending fewer than 183 days in the UK.

Beyond income tax, there are other UK obligations to manage: notifying HMRC of your departure, handling rental income from UK property you retain, managing National Insurance contributions, and understanding how UK pensions interact with your new non-resident status. This guide covers each of these in turn.

The Statutory Residence Test has been in force since 6 April 2013. It replaced a previously vague system that relied heavily on HMRC guidance and case law. The SRT provides a structured — though still complex — framework for determining whether you are UK-resident in any given tax year. Crucially, your residence status is determined year by year, not as a single lifetime decision.

The Automatic Overseas Test

You will be automatically non-UK resident for a tax year if you meet any of the following conditions. Firstly, if you were UK-resident in one or more of the three previous tax years and you spend fewer than 16 days in the UK during the current year. Secondly, if you were not UK-resident in any of the three previous tax years and you spend fewer than 46 days in the UK. Thirdly, if you work full-time overseas (at least 35 hours per week on average), spend fewer than 91 days in the UK, and do fewer than 31 days of work in the UK. For most people making a clean move to Dubai and taking up full-time employment there, the third condition is the most relevant — but the day-count requirements are strict and must be tracked carefully.

The Automatic UK Test

Even if you do not qualify as automatically non-resident, you will be automatically UK-resident if you spend 183 or more days in the UK during the tax year, if your only home is in the UK (and you have no overseas home), or if you work full-time in the UK for any period of 365 days. These are hard thresholds — exceeding any of them means you are UK-resident regardless of your overseas life.

The Sufficient Ties Test

If you fall between the automatic tests, you are assessed under the Sufficient Ties Test. This counts the number of “UK ties” you have: a family tie (UK-resident spouse or minor children), an accommodation tie (accessible UK accommodation), a work tie (working more than 40 days in the UK), a 90-day tie (spending more than 90 days in the UK in either of the two previous years), and a country tie (the UK is the country where you spent the most days, for returning residents only). The more ties you have, the fewer UK days you can spend before becoming UK-resident. Someone with four ties becomes UK-resident after just 16 UK days.

The P85 form (“Leaving the UK — getting your tax right”) is the formal way to notify HMRC that you are leaving the UK and will be living abroad. Submitting it is an important step that many people overlook, often because no one tells them it is required. HMRC will not automatically know you have left the country.

You should submit your P85 once you have left the UK and you are confident you will not be returning as a UK resident. You can submit it before you leave if your departure date and circumstances are settled, but many advisers suggest waiting until you are established in Dubai. The form is available on GOV.UK and can be submitted online or by post.

What the P85 asks for

• Your UK address and National Insurance number
• The date you left the UK
• Your overseas address (Dubai)
• Details of your UK income in the year of departure
• Whether you have a UK property and its status (sold, let, or kept)
• Whether you expect to return to the UK and, if so, when
• Your employer details (UK and overseas)

What happens after you submit

HMRC will review your P85 and, if satisfied with your non-resident claim, will update your tax records and may send you a tax calculation for the year of departure showing any refund owed or tax due. If you were on PAYE, your employer should have been operating the correct tax code for the part of the year you worked in the UK. HMRC may also issue a notice confirming your non-resident status, which can be useful for banking and financial purposes.

You can find the P85 form at gov.uk/tax-right-retire-abroad-return-to-uk. If you have a Self Assessment tax return obligation, you should also continue to file returns for any years in which you had UK taxable income, including the year of departure.

The UK tax year runs from 6 April to 5 April — not the calendar year. This quirk of the British tax system has material consequences for expats who move partway through a year. In the year you leave the UK, you are almost certainly going to be UK-resident for the earlier part of that tax year (up to your departure) and potentially non-resident for the later part.

In many cases, HMRC applies a concept called “split year treatment” — officially provided for under the SRT — which splits the tax year into a UK-resident part and an overseas-resident part. This means UK income earned before your departure is taxed in the UK in the usual way, but income earned after your departure date (and properly attributable to your overseas period) is not subject to UK income tax. Split year treatment is not automatic: you must claim it on your Self Assessment tax return for the relevant year, and it only applies if you meet certain conditions.

Why timing your departure matters

If you can choose when to start your Dubai role, moving before 6 April rather than after it can mean one fewer UK tax year to deal with. More practically, people who move in, say, January have a relatively short UK-resident period in that tax year, whereas someone who moves in March is UK-resident for almost the entire year and then needs to manage split-year treatment carefully.

Employers who relocate staff internationally are usually familiar with these issues and should provide tax equalisation or tax advice as part of the relocation package. If they do not, it is worth raising proactively.

Many UK expats moving to Dubai choose to retain their UK home and rent it out rather than sell. This is an entirely legitimate decision, but it creates ongoing UK tax obligations that do not disappear simply because you are now resident in the UAE.

The Non-Resident Landlord (NRL) Scheme

If you are a non-UK resident and you receive rental income from UK property, you fall within the Non-Resident Landlord scheme. Under the default rules, your letting agent (or tenant, if there is no agent) is required to deduct basic rate income tax (currently 20%) from your rental income before paying it to you and to pay that tax to HMRC quarterly. This happens automatically unless you apply to receive your rental income gross.

To receive gross rental payments — i.e. without the 20% deduction at source — you must apply to HMRC using form NRL1. HMRC will approve this if they are satisfied that your UK tax affairs are up to date and that you are likely to comply with your ongoing Self Assessment obligations. Even with gross payment status, you are still required to declare the rental income on an annual UK Self Assessment tax return and pay any income tax due.

Tax on rental income as a non-resident

Non-resident landlords pay UK income tax on their net rental profits (income minus allowable expenses) at UK rates. The personal allowance is available to most EEA nationals but not to non-EEA residents — and as UAE residents you would typically not receive the personal allowance, meaning tax applies from the first pound of rental profit. Allowable deductions include mortgage interest (subject to restrictions introduced in 2020), letting agent fees, maintenance and repairs, insurance, and service charges.

Capital gains tax also applies to UK residential property disposed of by non-residents, at rates of 18% or 24% depending on your income level in the year of disposal. This was a significant change introduced in 2015 and caught many long-term expats off guard when they eventually sold UK property.

When you move to Dubai and stop working in the UK, your National Insurance contributions typically stop. This has a direct impact on your entitlement to the UK State Pension. To receive the full new State Pension (£221.20 per week as of 2024/25), you need 35 qualifying years of National Insurance contributions. To receive any State Pension at all, you need at least 10 qualifying years. Years working in Dubai do not count toward your UK NI record.

Voluntary contributions: Class 2 and Class 3

HMRC allows non-resident UK nationals to make voluntary National Insurance contributions to protect their State Pension entitlement. The two relevant classes are Class 2 (available if you are working abroad and meet certain conditions, currently £3.45 per week for 2024/25) and Class 3 (available to anyone not working abroad in a qualifying capacity, currently £17.45 per week for 2024/25). Class 2 is substantially cheaper and, where available, is the option most advisers recommend.

You can check your State Pension forecast and NI record through the HMRC personal tax account at gov.uk. For most UK expats in their 30s and 40s heading to Dubai for a few years, continuing Class 2 contributions is a very cost-effective way to protect a pension entitlement worth tens of thousands of pounds over retirement. The annual cost (roughly £179 for Class 2) is modest relative to the State Pension benefit it protects.

You should register to pay voluntary contributions before you leave or shortly after arriving in Dubai, using HMRC's CF83 form.

The UK and UAE have had a Double Taxation Agreement (DTA) in force since 1993. Its primary purpose is to prevent the same income being taxed in both countries. In practice, since the UAE charges zero personal income tax, the agreement is less relevant for most employed expats than it would be for a move to, say, France or Germany — because there is no UAE tax to offset against UK tax.

However, the DTA is relevant in a number of specific circumstances. Pension income — including UK private and State Pension payments — is generally taxable only in the country of residence under the agreement, which can be advantageous for UK expats in Dubai drawing on pension income. Dividends from UK companies are generally taxable in the UK at reduced withholding tax rates. Rental income from UK property, however, remains taxable in the UK regardless of the DTA, as real property is almost universally taxed where it is situated under international tax treaty norms.

The DTA does not cover every type of income or every scenario, and its interaction with the UK's domestic legislation can be complex. The key practical takeaway is that the DTA alone does not mean you pay no UK tax — it operates alongside the SRT and the rest of the UK's tax code, not instead of them.

The scenarios above are manageable with care and good information. But there are situations where professional advice is not just helpful but essential. These include: if your SRT position is not clear-cut (for instance, you have multiple ties or an unpredictable UK day count); if you are selling a UK property and need to calculate non-resident CGT correctly; if you have complex investment income from UK sources; if you are a company director with UK company interests; or if HMRC opens an enquiry into your residency position.

Types of adviser

A UK tax accountant with international experience (ideally specifically in UK expat tax) can handle your Self Assessment returns, advise on the SRT, and deal with HMRC on your behalf. Look for membership of the ICAEW, ACCA, or the Chartered Institute of Taxation (CIOT). Some firms specialise exclusively in UK expat tax and are well worth the additional cost.

A cross-border Independent Financial Adviser (IFA) can advise on pension arrangements, investments, and financial planning across both UK and UAE jurisdictions. Ensure they are regulated by the FCA in the UK and/or the DFSA (Dubai Financial Services Authority) in the UAE. Be cautious of advisers in Dubai who are not FCA-regulated but purport to advise on UK pensions — this is a common source of poor outcomes for expats.

Typical costs

A UK expat tax accountant might charge £500–£1,500 per year for a Self Assessment return incorporating non-resident issues, rental property, and SRT analysis. Initial consultations are often £150–£300. For complex cases — multiple properties, significant investment income, or HMRC enquiries — costs can be higher. These are, however, material costs relative to the tax exposure they help you manage.