UK Inheritance Tax for Australians: 2025 Rules, Tail Risk and Planning

General information only, not personal tax, legal, or estate planning advice. UK inheritance tax is complex and the right answer depends heavily on your UK residence history, where assets are located, and your family circumstances. The UK rules changed significantly from 6 April 2025, and further changes are coming in 2026 and 2027. If you have meaningful UK links or assets, get UK specialist advice.

This article was substantially rewritten in May 2026 to reflect the UK’s move from a domicile-based to a residence-based inheritance tax regime from 6 April 2025, and the further changes coming in 2026 and 2027. If you read an earlier version of this article, please note that the underlying UK rules have changed and the current version supersedes everything you may have read previously.

If you are an Australian living in the United Kingdom (UK), returning to Australia after time in the UK, or you have UK assets through family, there is one topic that catches people badly off guard, UK Inheritance Tax (IHT).

Not because it is impossible to plan for, but because most Australians are used to a system where there is no Australian inheritance tax, and they assume the UK works the same way.

It does not.

And the rules just changed. From 6 April 2025, the UK rewrote the test for who is exposed to IHT on worldwide assets. A lot of older guidance you may find online is now out of date, including guidance that focuses heavily on “UK domicile”.

This guide is the plain-English version of what matters now, what tends to go wrong, and the practical steps to take before a family event forces you to learn IHT at high speed.

1) What is UK Inheritance Tax (IHT)?

UK IHT is a tax that can apply when someone dies and leaves assets. It can also apply to certain lifetime gifts.

The headline rate is 40% on the value of an estate above available thresholds and reliefs. A reduced rate of 36% can apply where 10% or more of the net estate passes to charity.

The key point for Australians is that the UK system is not just about where you live at the moment of death. It can depend on:

• whether you are treated as a UK “long-term resident” for IHT purposes
• whether you own UK-situs assets (for example UK property), which are always in scope regardless of where you live
• how assets are held (joint names, trusts, companies, pensions)

2) The concept Australians miss: long-term residence (it replaced domicile in 2025)

Until 6 April 2025, UK IHT exposure on worldwide assets turned on a concept called “domicile”, and a stickier version called “deemed domicile”. This was the trap most older articles warned about.

From 6 April 2025, that test has been replaced for IHT purposes.

Now, your exposure to UK IHT on non-UK assets depends on whether you are a “long-term resident” of the UK. In broad terms, you are a long-term resident in a tax year if you have been UK tax resident for at least 10 of the previous 20 UK tax years.

Three things flow from this that Australians need to understand:

• The test is mechanical, not subjective. Whether you were UK tax resident in a given year is generally decided by the UK’s Statutory Residence Test, the same test used for UK income tax and CGT. You can largely work it out from your travel and accommodation records.
• The 10-year threshold can be crossed faster than people expect. Many Australians do extended secondments, return home, then come back. Those years stack up inside the 20-year look-back.
• There is a “tail” after you leave. Becoming a long-term UK resident is the easy bit. Getting out of long-term resident status takes years, sometimes a full decade. The detail of how this works is in Section 3 below, because it is the single most misunderstood part of the new system.

Separate transitional rules apply to people who were deemed UK domiciled on 30 October 2024 and to those who left the UK before 6 April 2025. The answer for Australians who returned home in earlier years is fact-specific and worth checking.

3) The “IHT tail” explained (this is the bit that catches returning Aussies)

This is the most important section in the article. If you read nothing else, read this.

Under the old domicile rules, when you finally shook off UK domicile, you were out. Under the new rules, leaving the UK does not immediately get you out of the worldwide IHT net. There is a “tail” of continued exposure that runs for between 3 and 10 years after you leave, depending on how long you were UK resident.

How the tail is calculated

The length of the tail is tied to how many of the last 20 UK tax years you were tax resident for. The more years of UK residence behind you, the longer the tail.

Broadly, the published scale works like this:

• UK resident for 10 to 13 of the previous 20 years: tail of 3 years after departure
• UK resident for 14 of the previous 20 years: tail of 4 years
• UK resident for 15 of the previous 20 years: tail of 5 years
• UK resident for 16 of the previous 20 years: tail of 6 years
• UK resident for 17 of the previous 20 years: tail of 7 years
• UK resident for 18 of the previous 20 years: tail of 8 years
• UK resident for 19 of the previous 20 years: tail of 9 years
• UK resident for all 20 of the previous 20 years: tail of 10 years (the maximum)

So a sustained UK career of, say, 15 to 20 years means a tail of 5 to 10 years after you fly home to Australia. During the tail, your worldwide estate (your Australian home, your shares, your SMSF balances, your overseas property) is still inside the UK IHT system if you were to die in those years.

What “during the tail” actually means in practice

While you are still a long-term UK resident (whether physically in the UK or in your post-departure tail), the IHT rules treat you as if your worldwide estate is in scope. If you die in those years:

• UK IHT can apply to non-UK assets, not just UK assets
• UK lifetime gifts you have made in the previous 7 years are tested under UK IHT rules
• Certain trusts you set up while a long-term resident may still attract UK IHT consequences

Once the tail expires, and assuming you have not returned to the UK in the meantime, you fall out of long-term resident status for IHT. Your non-UK assets are then outside the worldwide IHT net. Your UK-situs assets (such as a London flat) remain in scope of UK IHT regardless, because UK IHT always applies to UK assets, irrespective of residence.

What can shorten or lengthen the tail

Two important wrinkles:

• Returning to the UK restarts the clock. If you leave and then come back to the UK before your tail has run out, your tail does not pick up where you left off. You go back to building UK tax years and your status is reassessed under the long-term resident test all over again.
• The 20-year look-back keeps moving. The test is always “10 out of the previous 20 tax years”. As years pass without UK residence, your UK years gradually drop out of the look-back window. After enough time, you cease to meet the 10-of-20 threshold and the tail ends.

A worked example

Take a hypothetical Australian, Anna.

Anna moved to London in 2007 and returned permanently to Sydney on 1 July 2025. She was UK tax resident for 18 of the 20 UK tax years before her departure.

Under the published scale, Anna’s tail is 8 years. That means for 8 years until roughly the 2033/34 UK tax year, Anna’s worldwide assets, including her Sydney home and her Australian investments, remain in scope of UK IHT if she were to die in that period. She would still be entitled to the UK nil-rate band and (where applicable) the residence nil-rate band, but everything above her thresholds could be exposed to 40% UK IHT.

Anna’s planning options during the tail look very different to her planning options after the tail ends. That is why the residence history map (Section 8A) is the first piece of work to do.

Transitional cases

Special rules apply to people who:

• were “deemed domiciled” for IHT on 30 October 2024, or
• left the UK before 6 April 2025

These transitional rules can give a different (often shorter) tail than the standard scale above. If you fall into either category, your position needs to be checked specifically, not assumed.

4) When can UK IHT apply to an Australian?

Common real-world scenarios we see:

Scenario A: Australian living in the UK long-term

If you have been UK resident for around a decade or more in the last 20 years, you are heading into “long-term resident” territory, which puts your worldwide estate in scope of UK IHT, not just your UK assets. The earlier you map your residence years, the better your planning options.

Scenario B: Australian who lived in the UK, then returned to Australia

The old rule of thumb was “leave the UK and the domicile clock eventually runs out”. The new rule is more mechanical: if you were a long-term resident when you left, the tail rules in Section 3 apply and your worldwide estate can stay in scope of UK IHT for between 3 and 10 years after departure.

This is one of the most common surprises for returning expats. Coming home does not automatically end the exposure.

Scenario C: You own UK property (even if you live in Australia)

UK-situs assets, particularly UK residential property, are within UK IHT regardless of residence or long-term resident status. This is unchanged by the 2025 reforms.

UK property is often the single biggest trigger of UK IHT exposure for Australians who have otherwise minimal UK links.

Scenario D: You inherit from UK family

Even if you never lived in the UK, family wealth can drag you into UK estates, UK probate, and IHT questions, plus Australian tax consequences when assets later flow to you or are sold.

5) The key IHT thresholds (and why “I’m not that wealthy” is no longer a safe assumption)

Before we get into the planning, you need to understand what the UK lets you pass on before any inheritance tax bites. There are two main allowances, and they stack on top of each other.

The nil-rate band: £325,000 per person

This is the basic tax-free allowance. The first £325,000 of your estate passes to your heirs with no UK inheritance tax. Anything above it can be taxed at 40% (or 36% if a big enough chunk goes to charity).

The £325,000 figure has been frozen at that level since 2009 and is now frozen until 5 April 2031, confirmed at the November 2025 Budget. While the allowance sits still, every house price rise and every market rally quietly drags more estates over the line into the IHT net. UK tax advisers call this “fiscal drag”. You can call it a stealth tax. Either way, “I’m not wealthy enough to worry about this” is an assumption that gets less true every year.

The residence nil-rate band: an extra £175,000 if you leave a home to your kids

The name is a mouthful, but it tells you exactly what it does. “Nil-rate” means the rate of tax is zero, so it is another tax-free allowance. “Residence” means you only get it if your estate includes (or recently included) a home you lived in, and that home passes to direct descendants. So, togerher it refers to a tax-free allowance, tied to passing on a residence.

On top of the £325,000 nil-rate band, you get this additional allowance of up to £175,000 if you pass a qualifying home to direct descendants. Direct descendants means children, grandchildren, stepchildren, adopted children, foster children, and their descendants. Spouses of those descendants can also qualify in certain circumstances.

Pass the home to anyone else (a sibling, a friend, a niece or nephew, a discretionary trust where the descendants are not clearly entitled) and this allowance generally does not apply. The UK government introduced it specifically to help people pass the family home to the next generation, not to give a general top-up allowance for everyone.

Stack the two allowances together and a single person can pass on up to £500,000 IHT-free in the right circumstances: £325,000 of basic nil-rate band, plus £175,000 of residence nil-rate band. The residence nil-rate band is also frozen until 5 April 2031.

The married couple bonus: up to £1 million combined

Anything left to a spouse or civil partner generally passes IHT-free, with no upper limit. But the more useful feature is that whatever allowance the first person did not use can be transferred to the surviving spouse. So when the survivor eventually dies, their estate can use both allowances.

That means a married couple or civil partnership can potentially shelter up to £1 million between them: £325,000 plus £175,000 each, doubled. This is the headline number you will see quoted in UK financial press.

The catch: the transfer between spouses is not automatic. The executors (the people legally responsible for sorting out the deceased’s estate) have to actively apply for it using specific HMRC forms, within set time limits, and with the right paperwork from the first death. If they don’t, the transferred allowance can be lost. We have seen families lose six-figure sums of allowance simply because nobody knew to claim it on the first death and the paperwork was never lodged. This is a real and avoidable problem.

The £2 million wealth taper

The £175,000 residence nil-rate band gets clawed back for larger estates. For every £2 your estate is worth above £2 million, you lose £1 of the residence nil-rate band. By the time the estate hits roughly £2.35 million, the £175,000 has been fully withdrawn (it tapers to zero), and you’re back to just the £325,000 basic allowance. So wealthier estates lose the extra “home” allowance entirely. The basic £325,000 nil-rate band is not affected by this taper, only the residence one.

Pensions: the big change coming in 2027

Until now, most UK pension pots have sat outside the estate for IHT. That has made pensions one of the most tax-efficient ways to pass wealth to the next generation in the UK. Many UK retirees have deliberately spent other money first and left their pension untouched, knowing it could pass to children with minimal tax.

That changes from 6 April 2027. Section 7 covers it in detail, but the headline is: most unused UK pension pots will be brought inside the estate for IHT. If you have a UK pension you have been leaving alone for the kids, your strategy needs a rethink.

Quick summary

• For a single person passing a home to children: up to £500,000 IHT-free.
• For a married couple or civil partnership doing the same: up to £1 million combined, but only if the executors claim the transfer.
• For estates worth more than £2 million: the £175,000 residence allowance starts disappearing, and is gone entirely by £2.35 million.
• For anyone with a UK pension: the rules change in April 2027, and pensions are no longer the tax shelter they were.

6) The Australian angle: “Australia has no inheritance tax, so I’m fine” (not the full story)

Australia abolished inheritance and estate taxes in 1979 and has not reintroduced them. That part is true.

But Australians can still face tax issues around death and inheritance, including:

• Capital gains tax (CGT) when inherited assets are sold later
• A specific CGT trap when assets that are not “taxable Australian property” pass through an Australian estate to a non-resident beneficiary, which can trigger a CGT event at the date of death payable by the estate
• Income tax on income generated by inherited assets
• Tax on the taxable component of superannuation death benefits paid to non-dependant beneficiaries

So the combined risk for Aussie expats and UK-linked families is:

• UK IHT on the estate, plus
• Australian tax consequences later in the chain (often CGT-related)

This is why it is worth getting both sides looked at. A UK solicitor or UK tax adviser for IHT, and Australian tax advice for the downstream Australian tax implications. Neither side sees the whole picture on its own.

7) Upcoming changes to be aware of (2026 and 2027)

Two further changes are already legislated and matter for Australians with UK exposure.

Change #1: From 6 April 2026: Business Property Relief and Agricultural Property Relief capped

The 100% rate of IHT relief on qualifying business and agricultural assets will be capped at a combined £2.5 million per person from 6 April 2026. This figure was originally announced as £1 million in the October 2024 Budget but was raised to £2.5 million in a Treasury announcement on 23 December 2025 and carried through into Finance Act 2026. Value above the cap generally receives only 50% relief, producing an effective IHT rate of around 20% on the excess.

The allowance is transferable between spouses and civil partners, so a couple may in principle be able to pass on up to £5 million of qualifying agricultural and business assets between them before the reduced 50% relief applies, on top of the ordinary nil-rate bands.

Relevant if you have a stake in a UK family business or farm.

Change #2: From 6 April 2027: Pensions inside the estate for IHT

From 6 April 2027, most unused UK pension funds and pension death benefits will be brought within the value of the deceased’s estate for IHT. Some benefits are excluded, including qualifying death-in-service benefits paid from a registered pension scheme. Payments to exempt beneficiaries such as a spouse, civil partner or qualifying charity may be relieved under the ordinary IHT exemption rules.

However, personal representatives will generally still need to obtain pension values, include them in the estate account, and claim the appropriate exemption. So this is not simply a continuation of the old “pensions sit outside the estate” position, even where no tax ends up being payable.

For Australians who have left a UK pension pot behind, this is the moment to reassess whether the strategy of “leave it untouched and let it pass to the kids” still works.

8) Practical planning moves that are commonly relevant

This is not a “do these things and you are safe” list. It is a “here are the areas to review” list.

A) Map your UK residence history

Under the new long-term resident test, everything starts with how many UK tax years you have notched up in the last 20. Until you know that, you cannot tell whether your worldwide estate is in or out of UK IHT, and you cannot calculate your tail. This is the first piece of work to do.

B) Review your wills (and make sure they work together)

If you have assets and family links in both countries, you may need:

• one will that deals cleanly with everything, or
• separate wills for UK and Australia that are drafted so they do not accidentally revoke each other

Bad paperwork here creates real costs in probate and delays for families.

C) Understand how UK property is held

Joint ownership, tenancy type, and entity structures can change what happens on death, and they affect how the property is valued and taxed.

D) Lifetime gifting and the 7-year rule

Gifts to individuals are generally treated as “potentially exempt transfers”. If you survive 7 years from the date of the gift, they fall out of your estate for IHT.

Die within 7 years and the gift may be brought back into the IHT calculation. Taper relief can reduce the tax payable on certain gifts made more than 3 years before death, but it does not reduce the value of the gift itself, and in practice it often only matters where the gift, together with earlier transfers, exceeds the available nil-rate band.

Two traps that catch people:

• Gifts with reservation of benefit. If you give an asset away but keep using or benefiting from it (the classic example is gifting the family home to the kids but continuing to live there rent-free), the 7-year clock generally does not start at all and the asset stays in your estate.
• Gifts into trusts are treated differently from gifts to individuals and can attract an immediate 20% IHT charge.

The 7-year rule survived the November 2025 Budget despite pre-Budget speculation about a lifetime gift cap, but the political pressure on it is real, so do not assume it will look the same forever.

E) Check beneficiary designations (pensions, life insurance)

Some assets pass outside the will. That can be helpful, or it can create new problems, especially with the 2027 pension change coming.

F) Plan around the tail, not against it

If you are inside an IHT tail, “wait until it runs out” can be a legitimate planning answer for some decisions, but it can be the wrong answer for others (for example, lifetime gifts where the 7-year clock should be started sooner rather than later). The right move depends on the length of your tail and what you want to achieve. This is precisely the kind of question to take to a specialist.

9) The “don’t get smashed” checklist for Australians with UK links

If any of these apply, get advice sooner rather than later:

• you own UK property
• you have lived in the UK for around 10 years or more in the last 20
• you are inside (or unsure whether you are inside) an IHT tail after leaving the UK
• you have UK pensions
• you have a UK spouse or expect to inherit from UK family wealth
• you have an interest in a UK family business or farm

And here is what to gather before you speak to an adviser. It will save time and fees:

• a list of assets, with values and locations (UK vs Australia vs elsewhere)
• your residency timeline, year by year, for the last 20 UK tax years
• copies of your wills, any trust deeds, and pension nominations
• UK property ownership documents
• details of any significant gifts you have made in the last 7 years

10) Official resources (starting points)

We strongly recommend using primary sources for the baseline rules.

• GOV.UK, How Inheritance Tax works: thresholds, rules and allowances
• GOV.UK, Inheritance Tax if you’re a long-term UK resident (the post-6 April 2025 rules, including the tail)
• GOV.UK, If you die when you are based outside the UK
• GOV.UK, Rules on giving gifts
• GOV.UK, Transferring an unused nil-rate band between spouses
• GOV.UK / HMRC, Inheritance Tax thresholds and interest rates
• GOV.UK / HMRC, Technical note: Inheritance Tax on pensions (from April 2027)
• ATO, How CGT applies to inherited assets

Book a UK IHT and Australian tax review

If any of the warning signs above apply to you, the most useful thing you can do this month is get the two sides of this looked at together: UK IHT (including your long-term resident status and your tail, if any) and the Australian CGT and superannuation consequences. Most lawyers and accountants only see one side. We work across both.

In a 60-minute consultation with us, we will walk you through:

• whether you are inside the UK long-term resident net, and if so for how long
• the length of your IHT tail (in years) if you have left the UK, or are planning to
• which of your assets, UK and Australian, are exposed to UK IHT today, and which are not
• which of the 2026 and 2027 changes affect you, and what (if anything) to do before they take effect
• the two or three highest-value planning moves available to your situation

It is a direct conversation in plain English. No jargon. No “scene setting” hour. You ask the questions, we give you the answers, and you leave the call knowing where you stand and what to do next.

Book your UK IHT and Australian tax review

If you would prefer to start by email, tell us in one sentence which bucket you are in (currently in the UK, recently returned to Australia, UK property owner, beneficiary of a UK estate), and we will reply with the three questions that matter most for your situation.