UK IHT for Non-Domiciliaries: Which Worldwide Assets Are Actually Taxable

A common but costly misconception among non-UK-domiciled individuals (“non-doms”) is that UK Inheritance Tax (IHT) applies only to assets physically located in the United Kingdom. The reality is more complex and, for many, significantly more expensive. HM Revenue & Customs (HMRC) statistics for 2021/22 recorded £6.1 billion in IHT receipts, a figure that has more than doubled from £3.0 billion a decade earlier (HMRC, 2023, Inheritance Tax Statistics Commentary). Crucially, the UK’s IHT rules do not simply follow the location of the asset; they are primarily determined by the deceased’s domicile status—a distinct legal concept separate from residence or nationality. A non-dom who has been resident in the UK for 15 of the past 20 tax years becomes “deemed domiciled” for IHT purposes, exposing their entire worldwide estate to a 40% tax charge on value above the £325,000 nil-rate band. Even those who avoid deemed domicile face a narrower but still material exposure: UK-situs assets—including UK property, shares in UK companies, and money held with UK banks—are always within the IHT net. Understanding which assets are actually taxable requires careful analysis of domicile, residence history, and the precise situs rules that HMRC applies.

For cross-border wealth transfers, some international families use channels like Airwallex global account to manage multi-currency holdings efficiently, though this does not alter IHT exposure without additional planning.

The Domicile Threshold: Why Your Legal Home Matters More Than Your Address

Domicile is the cornerstone of UK IHT liability for non-doms. Unlike residence, which is based on days spent in the UK, domicile is a common-law concept rooted in the place you consider your permanent home. Every individual acquires a domicile of origin at birth—typically their father’s domicile—which can only be replaced by a domicile of choice through evidence of permanent settlement in a new jurisdiction. HMRC scrutinises factors such as where you intend to be buried, the location of your family home, and the centre of your business interests.

A non-dom who remains non-UK-domiciled is only liable to IHT on their UK-situs assets. However, the Finance Act 2017 introduced the deemed domicile rule: once you have been UK-resident for 15 out of the past 20 tax years, you are treated as domiciled in the UK for IHT purposes. This triggers full liability on your worldwide estate. The Office for Budget Responsibility (OBR, 2023, Fiscal Risks Report) estimated that the deemed domicile rule increases IHT revenue by approximately £400 million per year by capturing assets that would otherwise fall outside the UK’s reach.

For non-doms who have not yet crossed the 15-year threshold, the key distinction is between UK-situs and non-UK-situs assets. Every asset class has a specific situs rule, and getting it wrong can mean unexpected tax bills for executors.

UK-Situs Assets: Always Within the IHT Net

Even for a non-dom who has never been UK-resident, certain assets are always subject to UK IHT because of their physical or legal location. This applies regardless of the owner’s domicile or residence status.

Land and Property in the UK

Real estate located in England, Wales, Scotland, or Northern Ireland is deemed UK-situs. This includes residential, commercial, and agricultural land. If a non-dom dies owning a flat in London worth £2 million, the estate owes IHT at 40% on the excess over the nil-rate band, with no relief for non-dom status. Since 2017, UK residential property held through an offshore company or trust is also caught—HMRC looks through the corporate structure to the underlying asset.

Shares and Securities of UK Companies

Shares registered in a UK company, even if the shareholder lives abroad, are UK-situs. This includes both publicly traded shares on the London Stock Exchange and private limited company shares. The situs of a share is determined by the country of incorporation, not where the share certificate is kept. For non-doms holding a portfolio of UK equities, the total value is aggregated with other UK assets for IHT purposes.

Bank Accounts and Cash

Money held in a UK bank account, building society, or with a UK branch of a foreign bank is UK-situs. This includes current accounts, savings accounts, and fixed-term deposits. Even if the funds originate from overseas earnings, the location of the account determines IHT exposure. A non-dom with £500,000 in a Barclays account would see that full amount counted toward their UK estate.

Non-UK Situs Assets: Generally Outside the Net (Unless You Are Deemed Domiciled)

For non-doms who have not yet become deemed domiciled, assets located outside the UK are generally excluded from IHT. This is the primary attraction of non-dom status for wealthy international families. However, the rules contain important nuances and exceptions.

Foreign Real Estate

A villa in France, a condo in Dubai, or a farm in Australia held directly by a non-dom is non-UK-situs and therefore outside the IHT charge. However, if the property is held through a UK company or trust that is itself UK-situs, HMRC may argue the underlying value is still caught. The key is to maintain clear legal separation and avoid UK-based wrappers.

Foreign Shares and Investment Portfolios

Shares in non-UK companies (e.g., Apple Inc. in the US, Toyota in Japan) are non-UK-situs. Similarly, units in offshore collective investment schemes are typically non-UK-situs if the fund is domiciled outside the UK. A non-dom with a $10 million portfolio of US equities held with a US broker would owe no UK IHT on those assets—provided they remain non-domiciled.

Overseas Bank Accounts

Money held in a bank account outside the UK, even if the account is denominated in GBP, is non-UK-situs. The location of the bank branch, not the currency, determines situs. A non-dom with a Swiss franc account in Zurich or a USD account in Singapore is safe from IHT on those balances, assuming no deemed domicile applies.

The Domicile Trap: When 15 Years of Residence Changes Everything

The deemed domicile rule is the single most important trap for long-term UK-resident non-doms. Once you have been UK-resident for 15 out of the past 20 tax years, your worldwide assets become subject to IHT, regardless of situs. This applies even if you have never formally acquired a domicile of choice in the UK.

The rule was introduced by the Finance Act 2017 and applies retrospectively—HMRC counts residence years going back to 6 April 2017 for the initial calculation, but for those who were already resident before that date, the clock resets. As of the 2024/25 tax year, a non-dom who arrived in the UK in 2009/10 and remained continuously resident would have crossed the 15-year threshold in 2024/25.

Once deemed domicile applies, the IHT nil-rate band of £325,000 (frozen until at least 2028) and the residence nil-rate band of up to £175,000 (for a main home passed to direct descendants) are available, but the entire worldwide estate above those bands is taxed at 40%. For a non-dom with significant overseas assets—a family business in India, a property portfolio in Hong Kong, or a trust in the Channel Islands—the IHT bill can run into millions.

Planning options exist, such as exiting the UK before the 15-year mark or restructuring ownership into excluded property trusts. However, these require careful timing and professional implementation.

Excluded Property Trusts: A Planning Tool for Non-Doms

An excluded property trust is a trust created by a non-dom settlor that holds non-UK assets. Provided the settlor was non-domiciled at the time the trust was created, and the trust assets remain non-UK-situs, the trust property is excluded from the settlor’s estate for IHT purposes. This can be a powerful tool for protecting foreign wealth from the 40% charge.

The key condition is that the settlor must be non-domiciled (not deemed domiciled) at the time of settlement. If the settlor later becomes deemed domiciled, the trust remains excluded property as long as no further additions of UK-situs assets are made. The trust can continue to grow and distribute to beneficiaries without triggering IHT on the underlying capital.

However, the rules are strict. Adding UK property to an excluded property trust after the settlor becomes deemed domiciled would bring that asset into the IHT net. Similarly, if the trust itself acquires UK assets, those specific assets become UK-situs and potentially taxable. The trust must also be structured to avoid being treated as a “settlement” under the Inheritance Tax Act 1984.

For non-doms planning to remain in the UK long-term, creating an excluded property trust before the 15-year residence threshold is reached can preserve the IHT-exempt status of foreign assets indefinitely. This is a common strategy for high-net-worth individuals from the Middle East, Asia, and Europe who intend to make the UK their home but retain significant overseas wealth.

Practical Steps to Determine Your IHT Exposure

Given the complexity of domicile and situs rules, every non-dom should take proactive steps to map their IHT exposure. The following checklist provides a starting point.

Step 1: Confirm Your Domicile Status

Document your domicile of origin and any evidence of a domicile of choice. Factors include where you own a home, where your children attend school, your will’s governing law, and your stated intention for burial. HMRC may challenge a claimed non-dom status if your ties to the UK are strong.

Step 2: Calculate Your UK Residence Years

Count the number of tax years (6 April to 5 April) you have been UK-resident since 6 April 2017. If you have been resident for 15 or more of the past 20 tax years, you are deemed domiciled and your worldwide estate is taxable. If you are close to the threshold, consider whether to exit the UK before reaching 15 years.

Step 3: List All Assets by Situs

Create a schedule of every significant asset—property, shares, bank accounts, collectibles, business interests—and determine its situs under HMRC rules. UK land, UK shares, and UK bank accounts are always caught. Foreign assets are safe only if you remain non-domiciled.

Step 4: Review Trust and Corporate Structures

If you hold assets through trusts or offshore companies, assess whether HMRC would look through the structure. UK residential property held via an offshore company is now directly subject to IHT. Excluded property trusts should be reviewed annually to ensure no UK situs assets have been inadvertently added.

FAQ

Q1: If I am a non-dom but have lived in the UK for 10 years, are my overseas assets subject to UK IHT?

No, not yet. You become deemed domiciled only after 15 years of UK residence in the past 20 tax years. At 10 years, you are still a non-dom for IHT purposes, so your non-UK situs assets (e.g., foreign property, overseas shares) remain outside the IHT net. However, your UK-situs assets—such as a London home or UK bank accounts—are always taxable. The clock resets if you leave the UK for a full tax year, so careful planning can delay or avoid the 15-year threshold.

Q2: Does holding UK property through an offshore company protect it from IHT?

No, it does not. Since 6 April 2017, UK residential property held through an offshore company, trust, or partnership is treated as directly owned by the individual for IHT purposes. HMRC applies a “look-through” approach, meaning the property’s value is included in your estate regardless of the corporate wrapper. This rule was introduced to close a long-standing avoidance loophole. Commercial property held via an offshore structure may still escape IHT, but residential property is firmly caught.

Q3: What happens to my IHT liability if I leave the UK permanently?

If you cease UK residence and remain non-domiciled, your IHT exposure narrows to only UK-situs assets. However, if you were deemed domiciled at the time of departure, you remain deemed domiciled for IHT purposes for the next three tax years after leaving (Finance Act 2017, Schedule 8). After that three-year tail, you revert to non-dom status, and only UK assets are taxable. If you die during the tail period, your worldwide estate is still subject to UK IHT.

References

• HMRC, 2023, Inheritance Tax Statistics Commentary (2021/22 data)
• Office for Budget Responsibility, 2023, Fiscal Risks Report (deemed domicile revenue estimate)
• Finance Act 2017, Schedule 8 (deemed domicile rules and three-year tail)
• Inheritance Tax Act 1984, Sections 6 and 48 (excluded property trusts and situs rules)