Leaving the UK Permanently: Your Complete Tax Guide

Leaving the United Kingdom permanently is one of the most financially consequential decisions a high-net-worth individual can make. The UK's Statutory Residence Test (SRT), introduced in April 2013, creates a detailed and sometimes unforgiving framework for determining whether you remain a UK tax resident after departure. Getting this wrong can result in years of unexpected UK tax liability. Getting it right, with careful planning, can deliver substantial and entirely lawful tax savings.

This guide sets out the key steps and considerations for anyone contemplating or actively planning a permanent departure from the UK.

Step One: Notify HMRC — Form P85

The first administrative step is to complete and submit Form P85 (Leaving the UK — Getting Your Tax Right). This form notifies HMRC that you are leaving and that you expect to be a non-UK resident in future. It is not, however, a declaration that you are non-resident — that determination is made retrospectively based on the SRT tests.

Key points about P85:

• Submit it after you have left, not before
• It covers employment income earned in the UK up to your departure date
• HMRC will issue a tax calculation and, if you have overpaid, a refund
• Completion does not remove your obligation to file self-assessment returns if you have UK source income

If you are self-employed or have complex income sources (including rental income from UK property), P85 alone is not sufficient. You will likely remain within the self-assessment regime.

Step Two: Understanding the Statutory Residence Test

The SRT is the definitive legal test for UK tax residency. It operates through three connected tests: the Automatic Overseas Tests, the Automatic UK Tests, and the Sufficient Ties Test.

Automatic Overseas Tests (you are non-resident if):

• You were non-UK resident in all of the previous three tax years and spend fewer than 46 days in the UK in the current year
• You were UK resident in one or more of the previous three tax years and spend fewer than 16 days in the UK
• You work full-time overseas (averaging at least 35 hours per week) and spend fewer than 91 days in the UK, with no more than 30 of those days spent working in the UK

The 16-day limit for recent leavers is notably strict. Many clients are surprised to learn that visiting family, attending UK business meetings, or being hospitalised in the UK can all eat into their day count.

Automatic UK Tests (you are UK resident if):

• You spend 183 or more days in the UK
• Your only home is in the UK
• You work full-time in the UK

The Sufficient Ties Test: If you fall into neither automatic category, the SRT uses "UK ties" — family tie, accommodation tie, work tie, 90-day tie, and country tie — to determine residence. The more ties, the fewer UK days you can spend before becoming resident.

Split-year treatment applies in the year of departure if you qualify under one of eight specific cases set out in the legislation. This is important: it means your UK tax liability is calculated only on income and gains arising in the UK part of the year, not the full year.

Key Income and Capital Gains Traps After Departure

Becoming non-UK resident does not mean you are free of all UK tax. The UK retains taxing rights over several categories of income and gains regardless of your residence status.

UK rental income remains taxable in the UK regardless of where you live. As a non-resident landlord, you must either:

• Apply to receive rents gross (HMRC NRL scheme)
• Or have your letting agent or tenant deduct 20% tax at source

You must declare this income annually on the UK self-assessment system.

UK employment income is taxable in the UK to the extent it relates to UK workdays, even if paid offshore.

UK-source savings income (bank interest, etc.) may be subject to UK withholding tax, though treaty relief is often available.

UK residential property gains: The critical point here is timing. Gains on UK residential property are subject to UK CGT regardless of your residence status under rules introduced in April 2015. However, if you sell before departure while still UK resident, the gain is subject to the normal CGT regime with available reliefs (including private residence relief for your main home). Selling your principal private residence before you leave, and before it has been empty for 18 months, may shelter a substantial gain. Professional advice before listing a property is essential.

The Temporary Non-Residence Rules: If you leave the UK and return within five complete tax years, certain gains and income realised while you were non-resident can be "rebased" back into UK liability. This catch-up provision is widely misunderstood. Realising large gains on non-UK assets during a brief period of non-residence is not always a safe strategy.

Pension Options When Leaving the UK

UK pensions do not disappear when you emigrate, but the options and implications deserve careful consideration.

Leave the pension in place: For many, leaving a UK pension invested is the simplest approach. QROPS (Qualifying Recognised Overseas Pension Schemes) transfers have their place, but the Overseas Transfer Charge of 25% applies unless you transfer to a scheme in the same country where you are resident — a restriction that limits their utility for many internationally mobile individuals. The charge can also apply retrospectively if you move countries within five years of a transfer.

SIPP flexibility: A UK Self-Invested Personal Pension can currently be drawn down from age 55 (rising to 57 from 6 April 2028). Payments to non-residents are typically paid net of 20% UK tax, though double taxation treaties with many countries allow you to claim this back or receive payments gross.

State Pension: Your entitlement to UK State Pension is based on your National Insurance contribution record. Living abroad does not diminish your entitlement, but in many countries your pension will be frozen at the rate at the time you left (or at the rate when you first claimed). Countries with reciprocal agreements — including all EEA states and about 30 others — receive annual uplifts. Check your specific destination.

Your Final UK Self-Assessment Return

For the tax year in which you leave, you must file a UK self-assessment return. Key elements:

• SA109 (Residence pages): These pages record your residence status, split-year treatment, overseas workday relief, and (for tax years up to 2024/25) remittance basis claims — the remittance basis was abolished from 6 April 2025 and replaced by the four-year Foreign Income and Gains (FIG) regime for eligible new arrivers. Errors on SA109 are extremely costly — HMRC has automated checks on this data.
• Report all UK source income and any gains on UK assets
• If split-year treatment applies, income and gains in the overseas part of the year (from non-UK sources) are excluded
• The deadline is 31 January following the end of the relevant tax year for online returns

In subsequent years, as a non-resident, you will still need to file if you have UK source income, gains on UK property, or income that requires adjustment under a tax treaty.

Checklist: Key Steps Before and After Departure

Before you leave:

• Take advice on the SRT — count your UK days carefully for at least the first two years
• Sell your principal private residence if you wish to shelter the gain under PPR relief
• Review UK share options, EMI schemes, and vesting schedules — UK tax may apply to the UK element
• Maximise pension contributions and ISA contributions in the pre-departure UK tax year
• Review your IHT position under the new residence-based rules (in force from 6 April 2025) — if you have been UK tax-resident for 10 or more of the last 20 tax years you are classed as a "long-term UK resident" and your worldwide assets remain within scope of UK IHT for a period after departure; the old domicile test no longer applies for IHT purposes

After you leave:

• File P85
• Register under the Non-Resident Landlord scheme if you have UK rental property
• Track UK days scrupulously — use a diary or app
• Obtain a tax identification number in your new country of residence and apply for a UK Certificate of Residence if treaty relief is needed on UK income
• File your final UK self-assessment return

Common Mistakes

The most expensive errors we see include:

1. Spending too many days in the UK in the first two years — particularly easy when family, medical appointments, and business obligations accumulate
2. Failing to apply for split-year treatment on the first return after departure
3. Not registering as a non-resident landlord and having letting agents deduct tax at source without later recovery
4. Triggering the temporary non-residence rules by realising large gains within five years and then returning

How Global Investments Can Help

At Global Investments, we work with internationally mobile individuals at every stage of their relocation journey. Our advisers co-ordinate across tax, investment, pensions, and estate planning to ensure that departure from the UK is structured efficiently and legally, with no costly surprises. Whether you are still in the planning phase or have already moved, we can review your position, assess your exposure to UK taxes, and help you put in place an appropriate structure for your new circumstances. Contact us to arrange a confidential consultation.

This article is for informational purposes only and does not constitute regulated financial or tax advice. Tax rules are complex and change frequently. Seek professional advice specific to your circumstances. Investments can fall as well as rise; past performance is not a reliable indicator of future results.