Leaving the UK for a New Life Abroad: 8 Tax Mistakes High-Net-Worth Individuals Should Avoid
Leaving the UK and starting a new life overseas can bring plenty of opportunities. For high-net-worth individuals, it may mean expanding a business, accessing new investment markets or finding a different environment for family life. However, there is an important side to relocation that is sometimes overlooked: what happens to your UK tax responsibilities once you leave?
It is easy to assume that moving abroad, purchasing a property overseas or obtaining residency in another country is enough to change your tax position. Unfortunately, the rules are not quite that simple.
Some UK tax obligations can continue after departure, while certain financial decisions made during the relocation process can create liabilities further down the line.
For individuals with substantial assets, business interests or complex financial arrangements, understanding these rules before leaving is essential. Here are eight tax mistakes worth avoiding:
1. Assuming Leaving the UK Automatically Ends Your Tax Residency
One of the most common mistakes is assuming that physical departure automatically makes you non-UK resident. This is not how the UK tax system works. HMRC uses the Statutory Residence Test to establish whether an individual is UK tax resident. The assessment considers factors including days spent in the UK, accommodation, employment and personal connections.
For example, someone might move to Dubai but continue spending considerable time in the UK, retain a UK home and maintain significant personal or business connections. Depending on the circumstances, these factors could affect their residency position. It is important to assess your position before leaving rather than relying on assumptions about how much time you can spend overseas.
2. Overlooking the Importance of Timing
The date you leave the UK can have an impact on your tax position. The UK tax year runs from 6 April to 5 April, and the timing of your departure may affect whether split-year treatment is available. There may also be important considerations around dividends, bonuses, asset disposals and other financial transactions. For example, a business owner planning to receive a substantial dividend around the time of relocation should understand how the payment will be treated under the relevant tax rules.
Similarly, an investor considering selling shares before or after departure should understand the potential tax consequences. There is no universal rule that says a transaction should always take place before leaving or after becoming non-resident. The right approach depends on the individual circumstances and the assets involved.
3. Forgetting About UK Income After Relocation
Becoming non-UK resident does not necessarily mean that all income becomes exempt from UK taxation.
Many individuals retain financial interests in Britain after moving overseas. These might include rental properties, company shares, business activities or other investments. UK rental income, for example, generally remains subject to UK income tax even when the property owner lives abroad.
The Non-Resident Landlord Scheme may also apply, meaning tax can be deducted from rental income unless appropriate arrangements are in place. Certain employment income and other UK-connected income can also remain taxable. Before leaving, identify the income you will continue receiving from the UK and understand what reporting obligations will apply.
4. Ignoring the Temporary Non-Residence Rules
Some individuals relocate overseas for a relatively short period, perhaps to pursue a business opportunity or spend time with family, while intending to return to the UK eventually. However, the UK has temporary non-residence rules designed to prevent certain tax advantages arising from short periods overseas.
Under particular circumstances, certain income and gains arising while an individual is temporarily non-resident may become taxable when they return to the UK. The rules are detailed and depend on factors such as the length of absence, previous residence history and the type of income or gains involved. This can be particularly relevant for entrepreneurs and investors considering asset disposals, distributions or other financial transactions while overseas.
If you think you may return to the UK within a few years, it is important to consider this before making significant financial decisions.
5. Failing to Review Business and Company Structures
For entrepreneurs and business owners, relocation introduces another layer of complexity. Moving personally does not necessarily mean your business moves with you. A UK company may remain UK tax resident even when its owner relocates overseas. However, the location of management and control decisions can also be relevant. If an owner begins making important company decisions from another country, additional corporate tax considerations may arise. International businesses may also need to consider permanent establishment risks, local registration requirements and reporting obligations.
For someone running a business between the UK and the UAE, it is particularly important to distinguish between personal tax residency and the company's own tax position. Both should be considered as part of the relocation plan.
6. Assuming Your Overseas Tax Position Will Be Straightforward
It is easy to concentrate on the UK rules and overlook the requirements of the country you are moving to. Every jurisdiction has its own approach to taxation, residency and financial reporting. The UAE, for example, does not impose federal personal income tax on individuals in the same way as the UK. However, corporate tax, VAT and other regulatory obligations may still apply depending on an individual's activities and business arrangements.
Other destinations, including Switzerland and Italy, have their own residency tests and tax arrangements.
Obtaining residency in another country does not automatically establish that you have become tax resident there.
You need to understand both sides of the move: your continuing obligations in the UK and your responsibilities in the destination country.
7. Leaving Inheritance and Estate Planning Until Later
Tax planning should not stop at income and capital gains. For wealthy families, inheritance and succession planning can be just as important. Moving overseas may affect how your estate is treated, particularly where assets are held across several jurisdictions. You may need to review existing wills, trusts and ownership arrangements to ensure they remain suitable.
UK inheritance tax rules also changed from April 2025, introducing a residence-based framework for many individuals rather than relying on the previous domicile-based approach. Long-term UK residence history can therefore be particularly important when considering future inheritance tax exposure. The implications will depend on your circumstances, the location of your assets and the applicable legislation.
8. Failing to Keep Proper Records
Record-keeping might not be the most interesting part of international relocation, but it can prove extremely important. If your tax residency is ever questioned, you may need to demonstrate where you have lived and how much time you have spent in different countries.
Useful records include:
- Travel dates and flight information.
- Details of UK and overseas accommodation.
- Employment and business arrangements.
- Relevant tax returns and correspondence.
- Evidence of your personal and family circumstances.
- Keeping these records from the beginning is considerably easier than attempting to reconstruct them several years later.
For individuals with international investments and business interests, good records also make ongoing tax compliance easier.
How Can You Avoid Unnecessary Tax Complications When Leaving the UK?
There is no universal checklist that suits every high-net-worth individual. Someone with a single investment portfolio will have different considerations from a business owner with UK property, overseas companies and family trusts.
However, a few principles apply to most international relocations.
- Start planning early.
- Understand the tax rules in both countries.
- Review your existing assets and business arrangements.
- Consider whether your intended departure date creates any particular issues.
- Most importantly, ensure that your UK and overseas advisers have a clear understanding of your circumstances.
At Mosaic Chambers Group, we advise individuals and businesses on UK and international tax matters, including UK tax residency, relocation planning, tax exit considerations and UAE tax compliance. We understand that moving overseas involves more than changing your address. It requires a clear understanding of how different parts of your financial affairs fit together.
Final Thoughts
Leaving the UK can be the right decision for many high-net-worth individuals, but it should not be approached casually from a tax perspective. The biggest problems often arise from assumptions: assuming that leaving ends UK tax residency, that overseas income is automatically exempt or that existing business structures will continue to operate in exactly the same way.
Taking advice before departure gives you the opportunity to identify these issues while there is still time to address them. A well-planned relocation should give you greater clarity about your financial position, rather than creating uncertainty that follows you into your new home.
This article is for general information only and does not constitute legal or tax advice.
Mosaic Chambers Group does not provide UAE corporate tax filing, registration, or accounting services.
Individual circumstances vary, and professional advice should be sought before acting on any of the above.
Frequently Asked Questions
1. Do I need to inform HMRC when I leave the UK?
You may need to notify HMRC when leaving the UK, depending on your circumstances. This is generally done through a Self Assessment tax return or, where applicable, form P85. The correct process depends on your employment and tax position.
2. How many days can I spend in the UK without becoming tax resident?
There is no single day limit that applies to everyone. Under the Statutory Residence Test, the number of days you can spend in the UK depends on factors including your previous residence history and your connections with the UK.
3. Do I pay UK capital gains tax after becoming non-UK resident?
Non-UK residents are generally outside the scope of UK capital gains tax on most disposals of overseas assets. However, UK property and certain other UK-connected assets can remain taxable. Temporary non-residence rules may also affect certain gains if you return to the UK within the relevant period.
4. What are the temporary non-residence rules?
These rules are designed to prevent individuals from avoiding certain UK taxes by moving overseas for a relatively short period and then returning. Depending on the circumstances, certain income and gains arising during the period overseas may become taxable when the individual returns.
5. Can I continue running my UK business after moving abroad?
Yes. You can generally continue owning or managing a UK business after relocating. However, your personal tax position and the company's corporate tax position should be reviewed, particularly where management decisions are made overseas.
6. Will I still pay UK inheritance tax after moving abroad?
Potentially. Since April 2025, the UK has used a residence-based framework for many individuals. Your long-term UK residence history and the location of your assets can affect whether UK inheritance tax applies after relocation.
7. Is moving to Dubai enough to stop paying UK tax?
No. Moving to Dubai does not automatically end UK tax residency or remove UK tax obligations. You need to establish your position under UK residence rules and consider any continuing UK income, assets and business interests.
8. When should I speak to a tax adviser before leaving the UK?
Ideally, six to twelve months before your planned departure. This gives you time to review your tax residency, investments, business arrangements and potential liabilities before making decisions that could be difficult to reverse.
