Many British expats who have lived abroad for decades believe they’ve left the UK tax system behind. But when it comes to Inheritance Tax (IHT), the situation is far more complicated. Even if you’ve been living overseas for 20 or more years, your estate may still fall within the scope of UK IHT — especially if you’ve retained certain ties to the UK or plan to return.
As of April 2025, the rules around domicile, tax residence, and returning expats remain as complex as ever. So if you’re a British citizen living overseas with international assets — or considering a move back to the UK — it’s vital to understand how the UK’s IHT rules may apply to your estate.
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The Foundations of Inheritance Tax
UK IHT is charged at 40% on estates valued above the nil-rate band, currently £325,000 for individuals or £650,000 for couples. An additional residence nil-rate band may be available if your main home is passed to direct descendants, potentially increasing the tax-free allowance.
But here’s the key point: IHT is determined by domicile, not tax residence. So you could live in Dubai, Bangkok, or Kuala Lumpur for 30 years and still be deemed UK-domiciled, and therefore liable for IHT on your worldwide estate.
In the most recent updates, it is now considering taking your pensions into consideration as part of your estate. Previously, they have been left out and something you can pass on to a beneficiary. However, new rulings see them being included as part of your estate.
On a separate note, inflation continues to rise, and I see this as a stealth tax because the nil-rate band hasn’t increased. Hypothetically, we should see more taxes collected because inflation pushes the prices up and potentially into the 40% bracket.
Why Domicile Matters More Than Residence
Domicile is a legal concept, distinct from tax residency. Most British citizens start life with a UK domicile of origin — usually the country where their father was domiciled when they were born. Even if you leave the UK and become non-resident, that domicile of origin sticks with you unless you actively replace it with a “domicile of choice.”
To establish a new domicile, you must not only move abroad but also show a clear intention to remain there permanently. HMRC will look at various factors, including your family’s location, property ownership, financial interests, club memberships, and even where you intend to be buried. Simply living abroad for 20 or more years isn’t enough to guarantee that your UK domicile is gone.
This catches a lot of people out because there is a difference between ‘residence’ and ‘domicile’. You can be a resident of Thailand and still be domiciled in the UK. To change that, as put above you have to become a non-dom and remove all ties to the UK.
The Risk of Returning to the UK
A particularly important trap to be aware of applies to people who return to the UK after many years abroad. If you were born in the UK and had a UK domicile of origin, and then you return and become UK-resident, you can become “deemed domiciled” for IHT purposes again — even if you had successfully established a foreign domicile while overseas.
Under current rules, if you become UK-resident and were UK-domiciled at birth, you are treated as UK-domiciled again for IHT purposes if you are resident in the UK for just one of the two tax years prior to death. In this case, all your worldwide assets may become liable to UK IHT immediately, regardless of how long you lived abroad or where those assets are located.
The Four-Year Rule: A Window of Opportunity
If you are not caught by the “returning UK domiciled” rule and you’ve successfully shed your UK domicile, then the UK’s four-year rule may offer some protection. When you return to the UK and resume tax residency, your non-UK assets are usually outside the scope of UK IHT for a grace period of up to four tax years.
During those four years, only your UK assets are exposed to IHT. After that, if you remain resident, your worldwide estate becomes liable again. This four-year window can provide critical estate planning opportunities, for example, restructuring wealth, gifting assets, or setting up protections like offshore trusts.
However, the four-year rule does not apply if you’re considered a returning domiciliary that is, if you were born in the UK and had a UK domicile of origin. In those cases, you’re caught immediately by the deemed domicile rules, and the grace period doesn’t apply.
Real-World Examples
Take the case of Michael, a British expat who left the UK in 1999 and settled in the UAE. He never returned to live in the UK and has no property or close family there. He’s built up wealth in Dubai and owns no UK assets. If he passes away in 2025 and can demonstrate that he established a domicile of choice in the UAE, only his UK-based assets, if any, would fall under UK IHT.
Contrast that with Sarah, who lived in Malaysia for 21 years and then returned to the UK in 2024 to retire. She was born in the UK and never formally severed her UK domicile. Despite her long period abroad, HMRC could consider her UK-domiciled again as soon as she becomes resident. Her Malaysian property, investments, and foreign bank accounts would all fall back under the UK IHT regime.
These examples show how returning to the UK, even after decades, can drastically alter your exposure to UK taxes.
Planning Ahead: What You Can Do
Long-term expats who want to protect their wealth should take proactive steps. First, it’s crucial to review and clarify your domicile status. This isn’t something to leave to assumption — it requires a legal and factual examination, often with professional advice.
Next, think carefully before moving back to the UK. Timing your return, or limiting your days spent in the UK, may help keep your non-UK assets out of the IHT net. If you’ve established a non-UK domicile and are planning to return, taking action during the four-year grace period can offer significant planning advantages.
Some expats may also benefit from setting up trusts or holding structures that place non-UK assets outside the UK estate, though this must be done well before any return to the UK, as anti-avoidance laws apply once deemed domiciled.
Finally, life insurance can be a helpful way to cover any anticipated IHT liabilities without forcing heirs to sell assets.
Closing Thoughts
The UK inheritance tax system has become increasingly aggressive in targeting long-term expats, especially those who return to the UK or fail to fully sever ties. If you’ve lived overseas for 20 or more years, don’t assume you’re in the clear. Unless you’ve carefully planned, your estate could still be liable for up to 40% tax on worldwide assets.
Understanding your domicile status, knowing how the four-year rule applies, and planning for a return to the UK are all essential steps in protecting your wealth and ensuring your estate passes efficiently to your heirs.
Expert Help for British Expats
At Investments for Expats, we specialise in helping British citizens navigate the complexities of international tax and estate planning. Suppose you’ve been abroad for many years. If you are thinking of returning to the UK, we can help you structure your finances to minimise exposure to IHT and other taxes.
Read some of my blogs on Inheritance Tax here:
- UK Expat Inheritance Tax (IHT)
- Guide to Inheritance Tax for British Expats
- Best Investment Platforms for Expats in 2025
From April 2025, the UK scrapped “Domicile” in favour of a residency test. If you have been a UK tax resident for at least 10 of the last 20 tax years, you are classified as a “Long-Term Resident.” This means your entire worldwide estate, not just your UK property, is now subject to 40% UK Inheritance Tax. Even if you have been abroad for several years, you must count back your residency history to see if you still hit that 10-year threshold.
The “IHT Tail” is a period after you leave the UK during which your global assets remain taxable by HMRC. In 2026, this is a sliding scale based on how long you lived in the UK. If you were a resident for 10–13 years, the tail is 3 tax years. However, if you were a UK resident for 20 years or more, you remain in the UK IHT net for a full 10 years after your departure date. This makes “clean break” planning essential for those moving to low-tax jurisdictions.
For now, yes, but the clock is ticking. While unused pension pots currently sit outside your taxable estate, the Autumn Budget confirmed that from April 2027, UK pensions will be brought into the IHT net. For expats with large SIPPs, 2026 is the “Golden Year” to consider strategies like pension transfers to a QROPS or structured withdrawals, as these assets could face a 40% tax hit if left unmanaged past the 2027 deadline.
