UK inheritance tax after leaving the UK
Leaving the UK does not necessarily remove a client's worldwide estate from UK inheritance tax immediately.
From 6 April 2025, the UK moved from a domicile-based framework to a long-term residence test for determining whether overseas assets fall within the scope of inheritance tax.
That means a former UK resident can remain within the UK inheritance-tax net for a period after departure.
Josh Clancey works alongside tax advisers, private-client lawyers and other professionals where the client's residence history creates wider financial-planning questions around investments, pensions, protection, liquidity and beneficiaries.
Leaving the UK and leaving the UK IHT net are not the same thing
From 6 April 2025, an individual is generally treated as a long-term UK resident for inheritance-tax purposes where they have been UK resident for at least 10 of the previous 20 tax years.
A person who becomes non-UK resident can continue to be treated as a long-term resident after departure.
HMRC refers to this continuing period as depending on the length of the individual's previous UK residence, with the post-departure period ranging from a minimum of three tax years to a maximum of 10.
The tax or legal adviser should establish the client's precise position.
Financial planning can then address the practical implications for:
- investment assets
- pensions
- life assurance
- estate liquidity
- beneficiaries
- internationally held wealth
- future residence
- retirement income
Common planning areas after a client leaves the UK
Worldwide estate exposure
Where the client remains a long-term UK resident after departure, overseas assets can remain relevant to UK inheritance tax.
The post-departure IHT tail
The period for which worldwide exposure can continue is not the same for every former UK resident.
HMRC confirms that someone who has been UK resident for 10 to 13 years may remain within the long-term residence rules for three years after leaving, while longer UK residence can extend the period further.
Pensions
Pension assets should be considered separately from personally owned investments and property.
The client's pension arrangements, beneficiary nominations and the wider estate plan may all need to be reviewed together.
Life assurance and liquidity
A client may have substantial wealth but insufficient immediately accessible capital to meet estate costs, family needs or other liabilities.
Assets held across several countries
A former UK resident may have property, investments and beneficiaries in several jurisdictions.
That can create estate-planning and liquidity issues beyond the UK inheritance-tax analysis alone.
A future return to the UK
Returning after a short period abroad can affect the residence analysis.
After 10 consecutive years of non-UK residence, HMRC states that the 10-out-of-20 test is reset, so only the year of return and future years count towards long-term residence.
Questions to ask when a client leaves the UK
How many of the previous 20 tax years has the client been UK resident?
That is central to determining whether the client is a long-term UK resident for inheritance-tax purposes.
How long will the post-departure period last?
The answer depends on the client's residence history and should be established by the tax or legal adviser.
What assets are held outside the UK?
Foreign investments, property and other assets may remain relevant while the client is still within the long-term residence rules.
What UK assets remain?
UK-situs assets can remain relevant to inheritance tax even after worldwide exposure has ended.
Are pensions and beneficiary nominations up to date?
Pension and estate planning should be coordinated rather than considered in isolation.
Is additional estate liquidity required?
The client may need to consider accessible capital or life assurance alongside the estate plan.
Does the client expect to return to the UK?
Future residence can materially affect the long-term inheritance-tax position.
Professional resources on UK inheritance tax and residence
The Document Centre includes technical briefs, professional guides and practical checklists covering long-term residence, UK inheritance tax, clients leaving the UK, estate and beneficiary coordination, pensions and internationally held assets.
Useful resources for advisers working with former UK residents
Long-Term Residence and UK Inheritance Tax
A focused technical brief covering the residence-based inheritance-tax framework introduced from 6 April 2025.
UK Inheritance Tax Long-Term Residence Red Flag Checklist
A practical checklist for identifying when a client's residence history may create continuing UK inheritance-tax exposure.
The Professional Adviser's Guide to UK Residence, the FIG Regime and Inheritance Tax
A wider professional guide covering the interaction between residence, the FIG regime and the post-2025 inheritance-tax framework.
The Professional Adviser's Guide to British Clients Leaving the UK
A broader guide covering the main financial-planning issues arising before and after departure.
Cross-Border Beneficiary and Estate Coordination
A technical brief covering pensions, investments and beneficiaries across multiple jurisdictions.
International Estate Planning Coordination Checklist
A practical checklist for reviewing assets, beneficiaries, pensions and liquidity alongside specialist estate advice.
The post-departure period depends on previous UK residence
The long-term residence rules are deliberately graduated.
HMRC's published guidance gives the following examples:
- 10 to 13 years of prior UK residence: long-term residence generally continues for three tax years after departure
- 14 years: four years
- 15 years: five years
The period can continue increasing with longer residence, up to a maximum of 10 tax years.
This makes the client's full residence history important.
Two clients leaving the UK on the same day can therefore have very different inheritance-tax positions.
The tax adviser or private-client lawyer should establish the precise exposure.
Josh can then help address the financial-planning consequences, such as:
- investment structure
- estate liquidity
- life assurance
- retirement planning
- pensions
- beneficiary arrangements
Long-term residence does not remove the need for cross-border estate coordination
The UK inheritance-tax analysis is only one part of the picture.
A client living overseas may also be subject to succession, estate or inheritance rules in their country of residence or where assets are located.
Double-taxation conventions can also be relevant in some cases. HMRC confirms that existing IHT conventions can continue to determine taxing rights and credits where both jurisdictions tax the same property.
That means the professional team may need to coordinate:
- UK inheritance tax
- local estate or inheritance taxes
- wills and succession
- asset ownership
- pensions
- trusts
- insurance
- liquidity
- beneficiary arrangements
The legal and tax advisers should establish the technical position.
Financial planning can then ensure the client's pensions, investments and liquidity arrangements reflect that advice.
When should the referral happen?
Ideally, before the client leaves the UK, but the planning remains relevant after departure.
An early review can help establish:
long-term residence status
the expected post-departure period
worldwide assets
pensions
beneficiaries
available estate liquidity
whether life assurance may be relevant
the client's expected future residence
The key is not to assume that emigration automatically ends worldwide UK inheritance-tax exposure.
Have a client who has left the UK but may still have UK inheritance-tax exposure?
If a client's residence history means overseas assets may remain within the UK inheritance-tax net, an initial discussion can help establish where financial planning should sit alongside the tax and estate-planning advice.