Guide to UK Inheritance Tax and the 10-Year Rule

The UK’s inheritance tax system was previously shaped by a combination of domicile, asset location, and specific reliefs, rather than simple residency alone. This created a system that was often misunderstood — particularly by internationally mobile families.

In broad terms, UK inheritance tax is charged at 40% on estates above the available allowances, with individuals benefiting from a standard nil-rate band and, in certain cases, an additional allowance linked to the family home.

The UK’s inheritance tax (IHT) system changed fundamentally in April 2025, moving from a domicile-based framework to a residence-based system. At the centre of the new rules is a single test that determines whether your worldwide assets fall into the UK inheritance tax net:

Have you been UK tax resident for 10 out of the last 20 tax years?

If you have lived abroad, returned to the UK, or expect to move again, this rule is critical.

What Is the UK’s 10-Year Inheritance Tax Rule?

Under the current rules, an individual is subject to UK inheritance tax on worldwide assets if they are classed as a Long-Term UK Resident.

You are a Long-Term UK Resident if:

You have been UK tax resident for at least 10 of the previous 20 tax years
This is assessed at the time of death

If you do not meet this test, UK inheritance tax generally applies only to UK-situated assets, such as UK property or pensions.

When Do the 10 Years Start?

There is no fixed start date. This is not a clock that started in April 2025. Instead, HMRC applies a rolling look-back test:

At death, HMRC looks back over the previous 20 tax years
They count how many of those years you were UK tax resident
If the total is 10 or more, worldwide assets fall into scope

Important: UK tax residence years before April 2025 still count towards the total.

Does Returning Before the Rule Change Matter?

Yes — but not negatively. If you returned to the UK before April 2025:

Those years still count towards the 10-out-of-20 test
However, the rule does not automatically pull you into the IHT net

For example:

Returned to the UK 4 years ago
You currently have 4 UK-resident tax years
You are below the 10-year threshold

Your overseas assets are not currently within the UK inheritance tax net.

If I Stay in the UK, When Would I Be Caught?

If you remain UK tax resident:

Each additional UK tax year adds to your total
Once you reach 10 UK-resident years out of the last 20, you become a Long-Term UK Resident

At that point:

Your worldwide estate may be subject to UK inheritance tax at up to 40%
Allowances may still apply, but the scope is much wider

UK Situs Assets and Key Inheritance Tax Exemptions

Even once someone leaves the UK, UK inheritance tax does not disappear entirely. Certain assets remain within the UK inheritance tax net regardless of where you live or how long ago you left.

These are known as UK situs assets.

UK situs assets are those situated on UK soil. They typically include:

UK property, whether residential or commercial
UK land
Shares in UK-incorporated companies (including many private companies)
Certain UK-based business interests
UK pensions

These assets are always potentially subject to UK inheritance tax on death, even if you are:

Non-UK resident
No longer within the IHT tail
Living permanently overseas

This is why UK property and shareholdings often remain a focal point of estate planning for internationally mobile families.

The Nil Rate Band (NRB)

The Nil Rate Band (NRB) is the amount of an estate that can pass free of UK inheritance tax.

Currently set at £325,000 per individual
Applies to the value of UK situs assets and, where relevant, worldwide assets
Can be transferred between spouses or civil partners on death if unused, potentially doubling the allowance on second death

Where assets exceed the available NRB, inheritance tax is generally charged at 40% on the excess.

The Residence Nil Rate Band (RNRB)

The Residence Nil Rate Band (RNRB) provides an additional allowance where a qualifying UK residential property is left to direct descendants.

Key points:

Currently up to £175,000 per person
Only one RNRB is available per individual, regardless of how many properties they own.
Applies only to UK residential property
Available where the property passes to direct descendants
Like the NRB, unused RNRB can usually be transferred to a surviving spouse on death

However, the RNRB:

Tapers away once an estate exceeds £2 million
Can be lost entirely for larger estates
Does not apply to non-residential UK property
The RNRB can be applied to one qualifying residential property only. It cannot be split across multiple homes. If more than one property could qualify as a residence, the personal representatives must choose which single property the RNRB applies For internationally mobile families with valuable UK property, this taper can significantly reduce the expected benefit.

Non-dom spouses and the spouse exemption

Transfers between spouses or civil partners are generally exempt from UK inheritance tax. However, special rules apply where one spouse is not UK domiciled.

Where a UK-domiciled individual leaves assets to a non-UK domiciled spouse:

The spouse exemption is limited (rather than unlimited)
The current exemption limit is £325,000 unless action is taken

To address this, a non-UK domiciled spouse may:

Elect to be treated as UK domiciled for inheritance tax purposes, which allows full spouse exemption

This election:

Can be effective, but
Brings the spouse’s worldwide estate into the UK IHT net, so it must be considered very carefully

Alternatively, planning may involve:

Trust structures
Lifetime gifting
Insurance-based solutions to manage the exposure

Why this matters in practice

For many people who leave the UK:

The IHT tail applies to worldwide assets for a limited time, but UK situs assets remain exposed indefinitely. This creates a layered risk:
Short- to medium-term exposure via the IHT tail
Long-term exposure via UK assets that never fall outside the UK tax net

Understanding how UK situs assets interact with:

The NRB and RNRB
Spouse exemptions
Non-dom rules

is critical to avoiding unpleasant surprises and ensuring that planning decisions made years earlier still achieve their intended outcome.

The length of the IHT tail depends on how long you were UK resident before leaving. Broadly:

Resident for 10–13 out of the previous 20 tax years
→ UK IHT typically continues to apply for around 3 further tax years after departure
Resident for longer periods
→ The IHT tail generally extends by one additional year for each extra year of UK residence, up to a maximum of 10 years

By way of illustration:

Resident for 15 out of 20 years → around 5 years of continued IHT exposure
Resident for 17 out of 20 years → around 7 years
Resident for 20 out of 20 years → up to the full 10-year IHT tail

During this tail period:

Worldwide assets can remain within the UK inheritance tax net
Lifetime gifts may still be treated as UK-chargeable transfers
Trust planning and gifting strategies can have different outcomes than expected if undertaken too late

Why this matters

This is where many people are caught out. There is a common assumption that once UK residence ends, UK inheritance tax ends too. In reality, the UK system is designed to unwind gradually, reflecting the depth of a person’s long-term connection to the UK.

As a result, exit planning is just as important as entry planning.

Understanding how many years of UK residence sit in your recent history — and how long the IHT tail is likely to last — can materially affect decisions around:

The timing of departure
When gifts are made
Whether trust planning is appropriate
How assets are structured before and after leaving the UK

Leaving without a plan can mean carrying UK inheritance tax exposure for years longer than expected, even while living permanently elsewhere.

Using Whole of Life Policies During the IHT Tail

For individuals who face an inheritance tax tail after leaving the UK, Whole of Life (WOL) insurance can play a useful supporting role in planning.

A Whole of Life policy is designed to pay out on death whenever it occurs, rather than for a fixed term. When structured correctly, it can provide liquidity at exactly the point inheritance tax becomes payable, without requiring assets to be sold at an inconvenient time.

Why this can matter during the IHT tail

During the IHT tail period:

UK inheritance tax can still apply to worldwide assets
The liability may arise even though you are no longer UK resident
Assets may be illiquid, overseas, or poorly timed for sale

A WOL policy can be used to fund all or part of the potential IHT liability, helping to protect the underlying estate from forced asset sales.

Trust ownership is key

To be effective for inheritance tax planning, a Whole of Life policy is typically:

Written into an appropriate trust, and
Structured so the policy proceeds fall outside the taxable estate

When done properly:

The policy payout is not itself subject to UK inheritance tax
Funds can be made available quickly to beneficiaries or trustees
The policy can act as a buffer during the tail period while longer-term planning continues

A bridging solution, not a silver bullet

It’s important to be clear about what WOL policies do — and don’t — achieve.

They do not remove inheritance tax.
They do help manage the financial impact of it.

In many cases, a Whole of Life policy works best as a bridging or risk-management tool, sitting alongside:

Gifting strategies
Trust planning undertaken at the right time
Asset restructuring before or after departure

As the IHT tail shortens and exposure reduces, the need for cover can be reviewed, adjusted, or potentially reduced.

Speak with an expert

If you would like to know more about this topic, get in touch today

Contact Jess Cook

Planning considerations

Whole of Life policies are not suitable for everyone. Key considerations include:

Cost and affordability over time
Health and underwriting requirements
Jurisdictional issues for expats
Ensuring trust documentation aligns with wider estate planning

Used thoughtfully, however, they can provide certainty in an otherwise uncertain period, particularly where UK inheritance tax exposure lingers after leaving the UK.

Does Citizenship or Passport Matter?

No.

Under the current UK inheritance tax system:

Citizenship is irrelevant
Nationality is irrelevant
Place of birth is irrelevant

What matters is UK tax residence, assessed under the Statutory Residence Test.

Why This Rule Matters

Inheritance tax is charged at 40% above available allowances.

For internationally mobile families, the difference between:

Being inside the worldwide IHT net, and Being outside it can amount to millions of pounds. The new rules reward early awareness and forward planning — not last-minute decisions.

Frequently Asked Questions:

What is the UK 10-year inheritance tax rule?Jess Cook2026-01-22T09:34:22+00:00

What is the UK 10-year inheritance tax rule?

It is the rule that brings worldwide assets into UK inheritance tax if you have been UK tax resident for 10 out of the last 20 tax years at the time of death.

Do years before April 2025 count?Jess Cook2026-01-22T09:34:46+00:00

Do years before April 2025 count?

Yes. UK tax residence years before the rule change still count towards the 10-year total.

If I returned to the UK four years ago, am I subject to UK IHT on overseas assets?Jess Cook2026-01-22T09:35:11+00:00

If I returned to the UK four years ago, am I subject to UK IHT on overseas assets?

Generally no. With fewer than 10 UK-resident years, overseas assets are usually outside the UK inheritance tax net at present.

If I have only been in the UK for 4 years and stay in the UK for another six years, will my worldwide assets be taxed?Jess Cook2026-01-22T09:35:32+00:00

If I have only been in the UK for 4 years and stay in the UK for another six years, will my worldwide assets be taxed?

Potentially yes. At that point you would likely meet the 10-out-of-20 test.

Is inheritance tax based on calendar years or tax years?Jess Cook2026-01-22T09:35:54+00:00

Is inheritance tax based on calendar years or tax years?

It is based on UK tax years, not calendar years.

Does transferring money to the UK trigger inheritance tax?Jess Cook2026-01-22T09:36:23+00:00

Does transferring money to the UK trigger inheritance tax?

No. Inheritance tax is assessed on the value of your estate at death, not on transfers during life.

Are overseas pensions included in inheritance tax?Jess Cook2026-01-22T09:36:45+00:00

Are overseas pensions included in inheritance tax?

This depends on the type of pension and evolving legislation. Pension planning should be reviewed separately but UK schemes are all in scope.

Next Steps

Understanding how long UK inheritance tax exposure may continue — and when planning is most effective — depends on your personal residence history and future plans.

If you’d like help reviewing how the 10-year rule, the IHT tail, and your existing structures interact, a confidential discussion can help clarify your position and next steps.

Online enquiry

Jessica Cook Chartered MCSI
Financial Planner for UK Residents and Specialist in Cross-Border Wealth for International Professionals & Globally Mobile Families

Hello, I’m Jessica.

Financial planning begins with your life, not your money. I help international professionals and families design their wealth with purpose, so they can enjoy today while protecting tomorrow.

I’m Jessica Cook, Chartered MCSI, featured in the Times Guide to the UK’s Top-Rated Financial Advisers. I specialise in international financial planning, cross-border wealth management, and tax-efficient strategies for UK residents, expatriates and globally mobile families.

With a background in law, a former career at the Financial Times, and as a regular financial columnist, I help clients organise, protect, and grow their wealth with confidence.

Reviews and Ratings for Financial adviser Jessica Cook, London

Chartered Status & Academic Background

Academic

LLB (Hons), Bournemouth University: Law degree completed at 2:1 (2000 to 2004). Provides the legal foundation underpinning trust law, contract law, succession and estate planning, all of which overlap heavily with senior financial planning work.

Chartered status

Chartered MCSI: Chartered Member of the Chartered Institute for Securities & Investment, in Wealth Management. The senior Chartered designation in this profession, awarded by a Royal Chartered body. Signals one the highest professional standing in UK wealth management.

Advanced Financial Planning Qualifications (CII)

Statutory gateway qualification (Level 4)

DipFA: Level 4 Diploma for Financial Advisers, awarded by the London Institute of Banking & Finance. Satisfies the FCA’s minimum requirement to give regulated financial advice in the UK and is the gateway qualification through which Jessica progressed to Chartered MCSI.

Advanced units (Ofqual Level 6, Chartered Insurance Institute)

AF5 – Advanced Financial Planning Process: The applied-planning examination at the highest level of the CII Advanced Diploma. Tests the ability to construct a full, integrated, written financial plan for a real client scenario.
AF7 – Pension Transfer Specialist: Demonstrating advanced technical knowledge of defined benefit and safeguarded benefit transfers, including APTA, TVC and CETV analysis. Applies this expertise within FCA rules and works alongside authorised Pension Transfer Specialists where required.
AF8 – Retirement Income Options: Covers the technical and behavioural complexity of decumulation, drawdown design and sustainable retirement income, including sequence-of-returns risk and longevity planning.

Diploma-level units (Chartered Insurance Institute)

R01 – Financial Services, Regulation and Ethics: The regulatory and ethical foundation underpinning all UK advice. Covers the FCA Handbook, Conduct Rules and ethical decision-making in practice.
R04 – Pensions and Retirement Planning: Foundational pensions knowledge spanning defined benefit, defined contribution, SIPPs, SSAS and retirement income strategies.
R06 – Financial Planning Practice: The applied case-study unit that integrates the rest of the Diploma into structured client-facing practice.

Specialist J-series unit (Chartered Insurance Institute)

J05 – Pension Income Options: Specialist study in retirement income strategies and product structures, complementing AF8 with deeper coverage at the J-series level.

FCA Registration & Professional Standing

FCA registration: Individual reference JXC15432, live on the Financial Conduct Authority Register. The publicly verifiable credential demonstrating current authorisation to give regulated financial advice in the UK.
Statement of Professional Standing: Annual confirmation that the adviser meets ongoing CPD requirements and ethical standards required under the FCA’s Retail Distribution Review rules. View Official CII Certificate
VouchedFor Top UK Advisers, 2026 Certificate of Excellence: Independent peer-reviewed recognition based on verified client reviews, audited by a third party. Inclusion is a recognised industry quality marker.

Jessica Cook LLB (Hons) Chartered MCSI, DipFA, AF5, AF7, AF8, J05, R01, R04, R06. FCA ref JXC15432. SPS 2025. VouchedFor Top UK Advisers 2026.

Independently verified on: FCA Register | CISI Directory | CII Directory

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