UK Domicile and Inheritance Tax: The Expat's Complete Guide 2026

Why domicile matters more than residence

There is a common misconception that if you move abroad and stop being a UK tax resident, you escape UK inheritance tax. This is not correct. UK inheritance tax is determined by your domicile — a legal concept that broadly means the country you consider your permanent home and to which you intend to return if you leave. Residence, by contrast, determines where you pay income tax and capital gains tax year by year. The two are entirely separate.

If you are UK-domiciled at the date of death — whether genuinely or under the deemed domicile rules — HMRC will tax your entire worldwide estate at 40% above the nil-rate band of £325,000. If you are non-UK domiciled, only the assets physically situated in the UK are caught. This distinction can make a difference of hundreds of thousands of pounds on a typical expat estate that includes overseas property, overseas savings, and overseas investments.

Use our IHT calculator to estimate the potential inheritance tax liability on your estate under different domicile scenarios.

Domicile of origin

Everyone is born with a domicile of origin. For most purposes this is the country where their father was domiciled at the time of their birth. If your father was domiciled in England and Wales when you were born, your domicile of origin is England and Wales. If he was domiciled in Scotland, your domicile of origin is Scotland. Children born outside marriage generally take the domicile of their mother.

The domicile of origin is remarkably tenacious. It does not disappear simply because you leave the UK — it is merely displaced if you acquire a domicile of choice elsewhere. Critically, if you ever lose a domicile of choice (for example, you leave your adopted country without settling permanently in another) your domicile of origin automatically revives. This is known as the “domicile bounce” and it catches many expats who move between countries thinking they have left their UK domicile behind permanently.

Domicile of choice: how to change it

To acquire a domicile of choice in another country, you must satisfy two requirements simultaneously: you must be physically resident in that country, and you must intend to reside there permanently or indefinitely. Crucially, “permanently or indefinitely” does not mean “forever” — it means you have no present intention to leave. But it must be a genuine settled intention, not simply a preference or hope.

HMRC and the courts look at a wide range of evidence to assess whether a domicile of choice has genuinely been acquired:

• Whether you own property in the new country (and have sold UK property)
• Whether you have become a tax resident of the new country
• Whether your family has moved with you
• Whether your will is drafted under the law of the new country
• Whether you have made a written statement of intent to remain permanently
• Whether you have closed UK bank accounts and severed financial ties with the UK
• Whether you hold citizenship or permanent residency in the new country
• Whether you are registered with local professional and civic bodies

Courts have regularly rejected claimed domicile changes in cases where the person maintained a UK home, kept a British-law will, returned to the UK frequently, or expressed any intention to “possibly return one day”. The standard of proof is high because the stakes — the entire worldwide estate — are substantial. HMRC investigations into domicile are common and can be expensive and distressing for executors to deal with after death.

The deemed domicile 15-year rule — in detail

Even if you have genuinely acquired a non-UK domicile of choice, you may still be caught by the deemed domicile rules for inheritance tax purposes. The rule works as follows: if you were previously UK-domiciled and you have been UK-resident in at least 15 of the preceding 20 tax years, HMRC treats you as UK-domiciled for IHT. This applies even though you may be genuinely non-UK domiciled under general law.

The 20-year look-back window moves with you. Each tax year that passes is a new 20-year window. The count uses UK tax years (6 April to 5 April), and each year you were UK-resident counts as one year in the test.

To exit deemed domicile status entirely, you must have 6 consecutive tax years of non-UK residence. This means expats who have left the UK relatively recently — within the past decade — are often still caught by the 15-year test and may remain so for several more years even if they never return.

For a full explanation of how IHT thresholds and rates work once you are determined to be UK-domiciled, see our UK Inheritance Tax 2026/27 guide.

What assets are caught even for non-domiciles

If you are genuinely non-UK domiciled (and not caught by deemed domicile), only your UK-situated assets fall within the scope of UK inheritance tax. The following are generally treated as UK-situated:

• UK residential and commercial property directly owned
• UK bank and building society accounts
• Shares in UK-registered companies held directly (not through an overseas holding vehicle)
• Physical possessions located in the UK at the date of death
• Debts owed to you by UK residents
• UK business assets

Assets generally not caught for non-domiciles include: overseas investment accounts, overseas property, shares in non-UK incorporated companies, and (in some circumstances) UK government gilts held through certain structures. Offshore bonds and insurance wrappers holding UK assets may also fall outside UK IHT depending on their structure — professional advice is essential here.

If you are an overseas beneficiary dealing with the estate of a UK-deceased person rather than your own planning, see our guide on UK inheritance tax when the deceased was non-resident.

Excluded property trusts

Before 2017, non-domiciled individuals could place overseas assets into an offshore trust and those assets would be treated as “excluded property” — permanently outside the scope of UK IHT even if the settlor later became deemed domiciled. This was a widely used planning tool for wealthy expats and non-domiciles.

The Finance (No. 2) Act 2017 significantly restricted these structures for individuals who become deemed domiciled, and further changes in the 2025 Finance Act have altered the landscape again. The position as of 2026 is complex: trusts set up while the individual was genuinely non-domiciled may still attract some protections, but the rules are layered and the interaction with the deemed domicile provisions requires careful specialist analysis.

The spouse exemption difference for mixed-domicile couples

For UK-domiciled couples, the spouse exemption is unlimited — assets passing to a surviving spouse on death are entirely free of IHT. This rule is different where the spouses have different domicile status.

If the deceased was UK-domiciled and the surviving spouse is non-UK-domiciled, the spouse exemption is capped at £325,000 (the same as the nil-rate band). Any amount above that passing to the non-domiciled spouse is taxable at 40%. This creates a significant trap for mixed-domicile couples who have not taken advice.

There is a statutory election available: a non-domiciled surviving spouse can elect to be treated as UK-domiciled for IHT purposes. This restores the unlimited spouse exemption. However, the election also means the surviving spouse's worldwide estate is then liable to UK IHT on their own death. Whether this election makes sense depends on the surviving spouse's overall estate and intentions — professional advice is strongly recommended before making the election.

Practical steps if you are an expat concerned about IHT

There is no single solution to managing UK IHT exposure as an expat, but the following steps cover the key areas to address:

1. Get a professional domicile assessment. A specialist UK tax adviser can assess your current domicile position based on your history, intentions, and actions. This assessment will form the foundation of any planning you do and will help your executor defend HMRC challenges after your death.
2. Document your intention in writing. Write a personal statement setting out your intention to remain permanently in your country of residence. Date it, keep copies, and update it periodically. In any domicile dispute after death, contemporaneous written evidence of intent is very valuable.
3. Update your will under local law. A will drafted under the law of your country of residence is strong evidence of a domicile of choice there. It also ensures your estate is administered efficiently under the law that applies to your assets.
4. Consider taking out life insurance in trust. A life insurance policy written in trust provides a lump sum that sits outside your estate. The proceeds can be used by your executors to pay any UK IHT bill without the beneficiaries needing to sell estate assets.
5. Make use of the 7-year gifting rules. Gifts made more than 7 years before death fall outside your estate entirely. The annual £3,000 exemption and other gift exemptions are also available. See our guide on the 7-year rule and IHT gift exemptions.
6. Consider excluded property trust planning if genuinely non-domiciled. If you are not yet deemed domiciled and hold significant overseas assets, a specialist may be able to structure these in a way that locks in excluded property status. Act early — once you become deemed domiciled the window for this planning closes.
7. Think ahead about transferring inheritance proceeds. If you are an overseas beneficiary expecting to receive UK inheritance funds, read our guide on transferring inheritance money out of the UK.

What happens when you die as an expat

When an expat dies, their executor must establish domicile status and declare it on the IHT400 form when applying for probate. HMRC may accept the declared position or it may open an inquiry and request detailed evidence. Domicile disputes with HMRC can be expensive and time-consuming, running into years in contested cases.

If the executor is also based overseas, managing UK probate from abroad adds a further layer of complexity. See our guide on applying for UK probate when you live abroad for a step-by-step explanation of the process for non-resident executors.

If the deceased was themselves non-resident in the UK, the rules about which assets are taxable and how IHT applies work somewhat differently. Our guide on UK inheritance tax when the deceased was non-resident covers this in detail.

Keep clear records of your domicile position throughout your lifetime. The more evidence your executor has to hand, the better placed they will be to deal with any HMRC challenge promptly and cost-effectively.

Frequently Asked Questions