UK Inheritance Tax and Offshore Assets in 2025

How UK inheritance tax now reaches offshore assets in 2025, the move to residence-based scope, excluded property, and planning for international families.

Inheritance tax is the quiet tax. It is easy to defer thinking about, because the cost lands on the next generation rather than the planner. Yet for international families with UK connections, it has become one of the most consequential exposures in their entire structure, and the rules defining who and what falls within its reach have shifted decisively.

The central change is the move away from domicile as the test for worldwide exposure, toward a system anchored in long-term residence. For 2025 and beyond, the question of whether UK inheritance tax reaches your offshore assets increasingly turns on how long you have lived in the UK rather than on where your permanent home is deemed to be.

This guide explains how IHT now interacts with offshore assets, what excluded property still means, and where the genuine planning opportunities and traps now lie for international families.

From Domicile To Long-Term Residence

Historically, UK inheritance tax exposure depended on domicile. A UK-domiciled individual was within scope on their worldwide assets; a non-domiciled individual was, broadly, within scope only on UK-situated assets, with deemed-domicile rules eventually pulling long-term residents into worldwide exposure.

The reformed framework reorients this around residence. In essence, individuals who have been UK resident for a sufficient number of years become exposed to inheritance tax on their worldwide estate, including offshore assets, while those who have not yet reached that threshold remain within scope principally on UK assets. There is also a tail: leaving the UK does not necessarily remove worldwide exposure immediately, and a period of continued exposure can follow departure depending on how long someone was resident.

The precise qualifying periods, the length of the post-departure tail, and the transitional rules are the subject of detailed and evolving legislation, and the specifics should always be confirmed against the current position. The principle, however, is settled: time spent UK resident, not inherited domicile, is now the lever that determines worldwide inheritance tax reach.

Why Asset Situs Still Matters

Even under a residence-based system, the location, or situs, of an asset retains real importance, particularly for those not yet within worldwide scope and for non-residents.

UK-situated assets, such as UK land and, in many cases, UK shares, generally remain within the UK inheritance tax net regardless of the owner's residence history. This is why offshore investors holding UK residential property have long faced exposure, and why the situs of each asset, where shares are registered, where real estate sits, where a bank account is held, remains a core part of any analysis.

The interaction can be subtle. Holding a UK asset through a non-UK company once changed its situs character for these purposes, but anti-avoidance rules now look through certain structures, especially those holding UK residential property, so that the underlying UK asset is brought back into charge. Situs planning that ignores these look-through provisions can give a false sense of safety.

Determining situs is also less mechanical than it sounds. Shares are generally situated where the company is registered or its register is kept, debts where the debtor resides, and bank accounts by reference to the branch. For internationally diversified estates, this means each holding may have a different situs and a different consequence, and a single portfolio can straddle the UK net and fall outside it at the same time. A careful situs schedule, asset by asset, is the foundation on which any reliable exposure analysis is built.

Excluded Property And Its Narrowing Role

Excluded property is the category of assets that fall outside the scope of UK inheritance tax. Classically, foreign assets held by a non-domiciled individual were excluded property, and foreign assets settled into trust by a non-domiciled settlor could be excluded property held outside the IHT net, including potentially the periodic and exit charges that apply to trusts.

The shift to a residence basis reshapes this. Whether assets, including those in trust, qualify as excluded property increasingly depends on the settlor's residence position over time rather than their domicile, and the protected status of trusts established under the old rules has had to be re-examined. Trusts that were confidently outside the net under domicile-based rules may now be exposed depending on the settlor's residence history and the timing of contributions.

For families who set up offshore trusts on the strength of the old excluded-property treatment, this is the single most important area to revisit. The structure may be perfectly valid; its inheritance tax efficiency may not survive the new rules untouched.

Common Traps For International Families

Assuming offshore means out of scope. Long-term UK residents are now potentially exposed on worldwide assets. The mere fact that wealth sits offshore no longer answers the question.

Overlooking the departure tail. Leaving the UK does not switch off worldwide exposure on the day you go. Planning a move without accounting for the continuing exposure period can leave an estate caught despite a genuine relocation.

Relying on old trust protections. Trusts established under domicile-based assumptions need a fresh review. Protected status cannot be assumed to carry over unchanged.

Ignoring double charges and reliefs. Other countries levy their own estate, inheritance, or succession taxes, sometimes on the same assets. Estate tax treaties and unilateral reliefs can mitigate double taxation, but only if the structure is arranged with them in mind. Forced-heirship rules in civil-law jurisdictions can also cut across UK planning.

Forgetting liquidity. Inheritance tax is generally payable before assets are fully distributed. An estate rich in illiquid offshore holdings can face a charge it cannot easily fund, forcing rushed sales. Life cover written appropriately, and liquidity planning, matter as much as the structuring itself.

Building A Durable Plan

Sound inheritance tax planning for international families starts with a clear map: each individual's residence history and trajectory, the situs of every material asset, and the status of any trusts or holding structures. From there, the work is to align the structure with the residence-based rules, to time any change of residence with the exposure tail in view, and to coordinate UK treatment with the succession and tax rules of every other relevant country.

Because the rules are in transition, plans built even a few years ago deserve a deliberate review rather than quiet confidence. The cost of getting this wrong falls on the people least able to fix it.

How HPT Helps

We help international families understand and manage UK inheritance tax exposure under the residence-based rules, including reviewing trusts established under the former regime, analysing asset situs, planning the timing of residence changes against the departure tail, and coordinating UK treatment with overseas succession and estate taxes. We also address the practical side, liquidity and the funding of any eventual charge, so that a legacy is preserved rather than diminished.

If your family has UK connections and assets held across borders, we can review where you stand and what the current rules mean for the next generation.