The UK is experiencing a significant shift in where wealthy families choose to live and hold their assets.

A recent report estimated that approximately $160 billion of private wealth has left the UK or become less connected to the country since the changes to the non-dom regime. Many high-net-worth individuals have reportedly moved towards the UAE, Monaco and Switzerland. Separately, Henley & Partners forecast a net outflow of 16,500 millionaires from the UK in 2025.

These figures should be interpreted carefully. The $160 billion figure represents the estimated wealth associated with individuals who moved or reduced their UK connections. It does not mean that $160 billion in cash was simply transferred into offshore accounts.

The more important point is this: leaving the UK is not the same as successfully restructuring your wealth.

The abolition of the remittance basis and the introduction of residence-based rules have changed the planning environment. Families now need to consider residence, long-term UK residence, inheritance tax, trusts, succession, reporting and currency together.

Here are seven common mistakes to avoid.

1. Treating a new address as proof of tax residence

relocating internationally, Monaco or Switzerland does not automatically end UK tax exposure.

UK residence is determined primarily through the Statutory Residence Test, which considers factors including:

  • Days spent in the UK
  • Available accommodation
  • Work performed in the UK
  • Family and other connections
  • Previous years of UK residence

A family may have a residence visa in another country while still meeting the UK’s domestic residence test. Treaty residence can also involve a separate analysis from domestic filing obligations.

This matters for both individuals and professional intermediaries. A client may believe they have “left the UK”, but their travel records, home, work patterns or family circumstances may tell a different story.

How to fix it

Build a written residence calendar before making the move. Record travel days, workdays, property use, family ties and the location of important decisions.

The analysis should cover at least the current tax year and the previous few years. For families with significant assets, it is also sensible to model a future return to the UK, because returning can change the tax and inheritance-tax position again.

2. Confusing residence, domicile, nationality and habitual residence

These terms are often used interchangeably. They are not the same.

  • Residence usually concerns where you live for tax purposes.
  • Domicile is a more complex legal concept connected to permanent home and long-term intention.
  • Nationality identifies citizenship.
  • Habitual residence may be relevant to succession and family law.

The UK’s 2025 changes made long-term UK residence more important for inheritance tax. Domicile is no longer the main connecting factor for many UK inheritance-tax questions, but it may still matter for older trusts, treaty analysis and succession law.

A person who moves from the UK to the UAE may therefore have one answer for tax residence, another for inheritance-tax exposure and a third for the succession law applying to certain assets.

How to fix it

Create a jurisdiction-by-jurisdiction map covering:

  1. Current and historic tax residence
  2. Domicile and nationality
  3. Location of each asset
  4. Legal and beneficial ownership
  5. Applicable succession law
  6. Possible inheritance-tax exposure

This is where family office structuring becomes valuable. The objective is not simply to create an offshore company or trust. It is to coordinate the family’s legal, tax, investment and succession position across jurisdictions.

3. Assuming that leaving the UK immediately removes inheritance-tax exposure

The post-2025 UK rules introduced a long-term UK residence test.

Broadly, an individual may be treated as a long-term UK resident if they have been UK resident for at least 10 of the previous 20 tax years. After departure, the inheritance-tax connection may continue for several years, depending on the individual’s residence history.

The residence clock does not simply disappear when someone boards a flight. Trust-owned assets can also have separate rules. Moving assets into a trust or leaving the UK does not automatically remove inheritance-tax risk.

The HMRC guidance on long-term UK residence should be considered alongside advice on trusts, asset ownership and the individual’s full residence history.

How to fix it

Before a departure, prepare a 20-year residence review. Identify:

  • The years in which the individual was UK resident
  • The expected length of the inheritance-tax tail
  • Assets owned personally
  • Assets held through companies, trusts or foundations
  • Potential exposure on death, gifts and distributions
  • The consequences of returning to the UK

This should be completed before transferring assets. Retrospective restructuring is often more expensive and less flexible.

4. Buying an investment product before designing the structure

This is one of the most expensive mistakes families make.

A portfolio, structured note, pension or property may appear attractive in isolation. But the product may be held in the wrong person’s name, in the wrong entity or under a structure that creates unnecessary tax, reporting or probate complications.

For example, an investment platform may offer multi-currency portfolios and fixed-income products. That does not answer:

  • Who should legally own the investment?
  • Who should benefit from it?
  • What happens on death?
  • Which country can tax the income or gains?
  • How will the asset be reported?
  • Can the family access the funds when needed?

The correct sequence is structure first, investment second.

How to fix it

Start with the family’s objectives:

  • Wealth preservation
  • Succession
  • Liquidity
  • Asset protection
  • Education funding
  • Retirement planning
  • International mobility

Then consider whether a personal portfolio, company, trust, foundation or pension arrangement is appropriate. Only after that should the underlying investment be selected.

At Capital FinServ International, we review regulated third-party investment platforms and explain the terms and costs line by line before any commitment. We are not lawyers or tax advisers, so the tax analysis should be confirmed with the client’s own advisers.

Explore our offshore investment services.

5. Treating offshore trusts as a shortcut around succession and probate

A trust can be useful, but it is not a magic solution.

Trusts may involve entry charges, ten-year periodic charges, exit or distribution considerations and detailed reporting obligations. The tax treatment can also depend on the settlor’s residence, the beneficiaries’ residence, the assets held and the timing of contributions and distributions.

Succession is a separate issue. A trust may help avoid some probate complications, but it does not automatically override local forced-heirship rules or the succession laws applying to property in another country.

Real estate is particularly important. Land generally follows the law of the country where it is located, while financial assets may be treated differently depending on the applicable private-international-law rules.

How to fix it

Map the family’s assets by location and ownership. Then coordinate:

  • Trust or foundation documents
  • Wills in relevant jurisdictions
  • Beneficiary designations
  • Real-estate succession
  • Forced-heirship rules
  • Probate requirements
  • Certified translations and document authentication

Capital FinServ International designs offshore trusts, foundations, pension consolidation and multi-jurisdictional succession plans in collaboration with drafting lawyers. The aim is to help families avoid opening probate in several countries unnecessarily.

Learn more about family office and trust formation.

6. Ignoring currency when calculating wealth and tax exposure

Currency risk is not just an investment issue.

A family may own property in euros, investments in US dollars and liabilities in sterling. The value of those assets can change significantly when measured in pounds. Exchange-rate movements can affect reported gains, estate values, inheritance-tax calculations and the amount of liquidity available for future liabilities.

Using the account’s base currency is not enough. You need a consistent record of:

  • Acquisition-date exchange rates
  • Disposal-date exchange rates
  • Distribution-date exchange rates
  • Death-date valuations
  • Property purchase and sale values
  • Currency conversion costs

How to fix it

Maintain a currency schedule for every significant asset. Review it whenever an asset is purchased, sold, transferred, distributed or included in an estate plan.

Currency should also be considered when selecting the investment structure. A portfolio designed for a UAE resident may not be suitable for someone with future UK liabilities or family members living in Europe.

Coastal terrace at sunset with an olive tree and a folder on a side table

7. Believing that offshore means private, unreported or free from oversight

Offshore does not mean invisible.

The Common Reporting Standard, FATCA, UK Self Assessment, Trust Registration Service requirements and source-country reporting rules can all require information about accounts, controlling persons, trustees and beneficiaries to be disclosed.

Families can also create problems by mixing pre- and post-6 April 2025 income and gains, failing to trace clean capital or assuming that an offshore account removes the need for UK reporting.

Poor records can make it difficult to claim transitional relief or determine whether a distribution is taxable.

How to fix it

Create a reporting file that includes:

  • Account statements
  • Trust accounts
  • Capital and income schedules
  • Asset acquisition records
  • Currency calculations
  • Beneficiary and controlling-person information
  • CRS and FATCA classifications
  • UK and local tax filings

Transparency should also apply to advisory fees and product costs. Before using an investment platform or purchasing property, request a complete schedule of platform fees, adviser charges, custody costs, commissions and developer payments.

At Capital FinServ International, we explain costs line by line before commitment. We do not hide intermediary mark-ups or developer arrangements. Where a developer pays us on completion, that arrangement is disclosed. Our aim is a clear decision, not a rushed product sale.

Globe with a folder structure and shield, representing reporting and oversight

A structure-first checklist for UK families

Before moving wealth offshore, ask:

  1. Where am I tax resident today?
  2. What is my 20-year UK residence history?
  3. How long might UK inheritance-tax exposure continue?
  4. Which assets are personally owned, and which are held through entities?
  5. Which succession laws apply to each asset?
  6. Are my wills coordinated across jurisdictions?
  7. Have historic and post-2025 income and gains been separated?
  8. Are currency records complete?
  9. Are all reporting obligations understood?
  10. Have I seen every fee, commission and platform cost in writing?

The UK wealth exodus may continue, but relocation alone is not a wealth strategy. A successful plan combines genuine residence management, appropriate ownership, coordinated succession, disciplined reporting and investments selected only after the structure is clear.

Capital FinServ International helps families and professional intermediaries approach international wealth planning in that order. Start a conversation to discuss the structure before the investment.

This article is for general information only and does not constitute tax, legal, investment or immigration advice. Rules vary by individual circumstances and jurisdiction. Obtain advice from appropriately qualified advisers before taking action.

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