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It depends on domicile, not residence. If the deceased was UK-domiciled (or deemed UK-domiciled), their entire worldwide estate is subject to UK inheritance tax at 40% above the nil-rate band — regardless of where they lived at death. If genuinely non-UK domiciled, only UK-situated assets are caught.
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This is the single most important concept to understand when dealing with the inheritance tax affairs of someone who lived abroad. In UK tax law, residence and domicile are entirely different legal concepts, and it is domicile — not residence — that determines the scope of UK inheritance tax liability.
Residence is a relatively straightforward factual test: where did you spend your time? The UK Statutory Residence Test determines whether someone was UK-resident in a given tax year based on the number of days spent in the UK and the nature of their connections here.
Domicile is an older, more complex concept rooted in common law. It broadly means the country that a person considers their permanent home — the place to which they would ultimately return and in which they intend to spend the rest of their life. Crucially, you can be resident in Singapore for 20 years — paying Singapore taxes, holding a Singapore permanent resident card — and still be UK-domiciled.
For UK inheritance tax purposes, a UK-domiciled individual's entire worldwide estate is subject to IHT. A non-UK domiciled individual's UK IHT liability is limited to UK-situated assets only.
Every person acquires a domicile of origin at birth. For most people, this is the domicile of their father at the time of their birth (or their mother's domicile if they were born outside of wedlock, under older rules). The domicile of origin is the bedrock of the domicile concept — it does not simply fall away when you move abroad or become a citizen of another country.
Domicile of origin is remarkably sticky. English courts have been extremely reluctant to find that it has been abandoned. There are documented cases of individuals who spent decades living abroad, became citizens of other countries, and never returned to the UK — yet whose estates were still held to have a UK domicile of origin.
If someone was born in the UK to UK-domiciled parents, the starting presumption is that their domicile of origin is UK. This presumption can only be displaced by evidence that they acquired a domicile of choice elsewhere — a high legal threshold.
A domicile of choice is acquired when a person both settles in a new country and intends to remain there permanently or indefinitely. Both elements — physical presence and intention — must be satisfied simultaneously.
The intention required is very specific: it is not enough to say you intend to stay “for the foreseeable future” or “probably for the rest of your life”. The courts look for a settled intention to make the new country your permanent home, with no intention to return to the UK except for visits.
HMRC and the courts assess intention from all available evidence:
Vague plans to “retire to Spain one day” or “probably stay in Australia long-term” are generally insufficient. The threshold is high, and HMRC regularly challenges claims that a UK-born individual has abandoned their UK domicile of origin.
Even if someone genuinely succeeded in shedding their UK domicile of origin and acquiring a foreign domicile of choice, they may still be caught by the statutory deemed domicile rules for inheritance tax purposes.
Under the 15-year rule, an individual is treated as UK-domiciled for IHT if they were resident in the UK for at least 15 of the 20 tax years immediately preceding the tax year in which the event being assessed occurs (typically, the tax year of death). This is counted by full tax years of UK residence, not calendar years, and uses the Statutory Residence Test to assess residence in each year.
⚠ Important
The deemed domicile rule catches many long-term expats who believe they have escaped UK inheritance tax. An individual who lived in the UK for the first 40 years of their life before emigrating could remain within the deemed domicile net for another 5–6 years after leaving, even if they have already acquired a genuine foreign domicile of choice.
Once caught by deemed domicile, the individual's worldwide estate is subject to UK IHT as if they were actually UK-domiciled. The deemed domicile status is only lost once the individual has been non-UK resident for 6 consecutive complete tax years.
This means there is a significant window after emigration during which a long-term UK resident remains subject to UK IHT on their worldwide estate, even if they have definitively left the UK and have no intention of returning.
Even for UK-domiciled individuals, certain assets are excluded from their estate for IHT purposes. The most significant exclusion relates to overseas assets held in qualifying trusts established whilst the individual was non-UK domiciled.
Specifically, assets held outside the UK in a settlement (trust) created whilst the settlor was non-UK domiciled (and not deemed UK domiciled) are excluded property and fall outside the IHT charge, even after the settlor acquires UK domicile or deemed domicile. This makes overseas trusts a significant estate planning tool for individuals who move to the UK after a period of non-UK domicile.
Other excluded property includes certain foreign government securities. The rules here are technical and have been tightened in recent years. Professional advice is essential before assuming that any asset qualifies as excluded property.
Planning window
The excluded property rules create a planning opportunity for individuals who are non-UK domiciled but anticipate becoming UK resident — for example, someone moving to the UK from abroad. If overseas assets are settled into a qualifying trust before UK deemed domicile is acquired, those assets may be permanently sheltered from UK IHT. This planning must be done before the point of deemed domicile, not after.
For individuals who are genuinely non-UK domiciled (and not deemed UK domiciled), UK IHT applies only to assets situated in the UK. The question of where an asset is situated is determined by legal rules, not simply by where the owner chooses to keep it.
Note that shares are generally treated as situated where the company is registered, not where the shares are physically held or where the company's assets are located. UK ETFs or investment funds with UK registration are therefore UK-situated even if the underlying investments are global.
A significant risk for internationally mobile individuals is that the same assets may be subject to inheritance or estate tax in two countries simultaneously. The UK has estate duty or inheritance tax treaties with a number of countries, which provide relief in these circumstances.
The UK's double taxation treaties for IHT/estate duty purposes cover: USA, France, India, Italy, the Netherlands, Pakistan, South Africa, Sweden, and Switzerland. The precise terms of each treaty vary, but they generally provide that where both countries would otherwise tax the same assets, one country gives credit for the tax paid to the other.
Where no treaty exists — which covers the majority of countries — the UK offers limited unilateral double taxation relief for foreign taxes paid on assets also subject to UK IHT. The relief is the lower of the UK IHT and the foreign tax. This does not fully eliminate double taxation in all cases.
Relief must be claimed
Double taxation relief is not applied automatically. It must be claimed on form IHT400, supported by evidence of the foreign tax paid. Executors should retain all documentation of foreign inheritance or estate taxes paid, including receipts and assessments from the foreign tax authority.
Transfers between spouses and civil partners are generally exempt from UK inheritance tax. However, this exemption is not unlimited where the surviving spouse is non-UK domiciled.
Where the deceased was UK-domiciled and the surviving spouse is non-UK domiciled, the spousal exemption is capped at £325,000 (the nil-rate band). This means that assets passing to the non-domiciled spouse above this amount are subject to IHT at 40%, even though they would have been entirely exempt if the surviving spouse were also UK-domiciled.
The spousal election
A non-UK domiciled surviving spouse can elect to be treated as UK-domiciled for IHT purposes. Making this election means that assets passing to them are fully exempt from IHT (using the unlimited spousal exemption). However, it also means that their own worldwide estate will subsequently be subject to UK IHT. The election is irrevocable for a period and should be considered very carefully with professional advice.
This issue most commonly arises in international marriages where one spouse is British and one is from another country. It can also arise where a British couple has emigrated and one spouse has successfully shed their UK domicile whilst the other has not.
If there is any doubt about the deceased's domicile status, or if the estate may be subject to UK IHT, there are several immediate steps to take.
IHT400 must be submitted to HMRC within 6 months of the date of death. Missing this deadline results in interest charges on any tax due. If the domicile position is uncertain, it is still advisable to submit the form by the deadline with a note that domicile is under review.
Domicile disputes with HMRC can be lengthy and expensive. A specialist in international private client law or tax can assess the domicile position, advise on what evidence to gather, and engage with HMRC on your behalf. Do not make assumptions about domicile without professional input.
Gather any documents that shed light on the deceased's intentions and connections — letters, emails, statements in the will, details of where they lived, worked, voted, held bank accounts, and were registered for health services. Once the estate is administered, this evidence becomes harder to recover.
If HMRC opens an enquiry into the domicile position, any inheritance tax assessment may take years to resolve. Distributing the estate before the tax position is settled creates personal liability for the executor if insufficient funds remain in the estate to pay the tax.
⚠ Important
HMRC enquiries into domicile can take several years to conclude and may involve extensive disclosure of personal documents and financial records. If the domicile position is challenged and HMRC succeeds, the tax charge can be very large — 40% on a worldwide estate can represent a substantial sum. Never assume that living abroad for a long period is sufficient to establish non-UK domicile.
For a full overview of UK inheritance tax rates, thresholds, and exemptions, see our UK inheritance tax guide 2026/27. You can also estimate potential IHT liability using our inheritance tax calculator.
Applying for probate as an overseas executor?
If you are based abroad and need to apply for UK probate, see our companion guide: how to apply for UK probate when you live abroad.
Understanding the full UK probate process
For a complete overview of the UK probate process from start to finish, see our complete UK probate guide 2026.
Expat IHT planning guide
For a detailed guide on inheritance tax planning for UK expats and non-domiciles, including the use of overseas trusts and the excluded property rules, see: UK domicile and inheritance tax: a guide for expats.
Possibly. It depends on whether he retained UK domicile of origin or acquired an Australian domicile of choice, and whether the deemed domicile 15-year rule applies. Living in Australia for 30 years does not automatically shed UK domicile — domicile of origin is notoriously difficult to lose. Specialist legal advice is essential to assess the position accurately.
For genuinely non-UK domiciled individuals, UK IHT applies to all UK-situated assets: UK property, UK bank accounts, shares in UK- registered companies, UK government gilts, and physical assets located in the UK. Overseas property, offshore bank accounts, and shares in foreign-registered companies are outside scope.
The deemed domicile rule treats an individual as UK-domiciled for IHT if they were UK-resident for 15 or more of the 20 tax years immediately before the relevant tax year. Once caught, their worldwide estate is subject to UK IHT. The status is only lost after 6 consecutive years of non-UK residence.
Yes, in certain circumstances. If the UK has an IHT treaty with the country concerned (USA, France, India, Italy, Netherlands, Pakistan, South Africa, Sweden, Switzerland), credit may be available. Where no treaty exists, unilateral relief is available in some cases. The relief must be claimed on IHT400 with supporting evidence.
This is not uncommon in internationally mobile families. HMRC looks at a wide range of evidence — the will, letters, voting registration, where the person kept their possessions, whether they held foreign citizenship, and more. Where domicile is genuinely uncertain, take specialist legal advice before submitting IHT forms, and preserve all relevant documents.
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