United Kingdom & Australia: UK ⇔ Australia: The domicile trap expats don’t see coming

Principle 01 — Domicile: why moving to Australia is not enough

The most common misunderstanding in this corridor is the assumption that moving to Australia — even permanently — automatically removes UK Inheritance Tax exposure. It does not. Domicile is not the same as residence, and it is considerably harder to change.

Under UK common law, every person has a domicile — essentially, the country that is their permanent home. You are born with a domicile of origin. To change it, you must acquire a domicile of choice, which requires both physical presence in the new country and a clear, settled intention to reside there permanently.

UK courts have historically applied this test with rigour. Maintaining any UK ties — a property, visits to family, a UK pension, membership of UK clubs or institutions — can be treated as inconsistent with a firm intention to remain in Australia permanently.

1. Domicile of origin is persistent. A UK-origin domicile does not fade with time spent abroad. It remains until positively displaced by a domicile of choice. There is no automatic expiry — even after decades in Australia.
2. Acquiring a domicile of choice requires clear intent. The intention must be to remain in Australia permanently — not just indefinitely. Statements of intent, lifestyle evidence, and disposal of UK connections all carry weight in any subsequent assessment.
3. Deemed domicile adds a statutory layer. UK tax legislation deems UK-born individuals to be UK-domiciled for IHT purposes if they have been resident in the UK for a significant number of the preceding years — even if currently living abroad.
4. Domicile of origin revives. If a domicile of choice (e.g. Australian) is subsequently abandoned — for instance by leaving Australia — the UK domicile of origin automatically revives. There is no “banking” of a changed domicile if circumstances alter.

Principle 02 — UK Inheritance Tax: the worldwide reach

For a UK-domiciled individual, UK Inheritance Tax is assessed on the value of their entire worldwide estate at death — including Australian property, Australian bank accounts, Australian shares, and superannuation in some circumstances.

The key reliefs — spouse exemption, nil-rate band, residence nil-rate band — are fixed amounts that do not scale with the size of an international estate, and their real value erodes over time as asset values rise.

Principle 03 — Australia’s tax position: no estate duty, but CGT matters

Australia’s abolition of estate duty removes one layer of complexity from this corridor. But capital gains tax considerations mean the picture is not entirely clean.

When an Australian-resident beneficiary inherits assets, they do not pay Australian tax on receiving the inheritance itself. However, the cost base of those assets — for future CGT purposes — is generally set at the market value at the date of death. Any subsequent disposal of the inherited assets can trigger CGT on gains accruing after the date of death.

Principle 04 — Planning approaches: what can and cannot be done

There is no single clean solution to UK IHT exposure in the Australia corridor. But there are planning directions that, if pursued early, can reduce exposure.

The starting point for any planning is establishing the actual domicile position — not the assumed position. Many UK emigrants have never formally assessed this, and the gap between assumed and actual domicile status is where unexpected liability arises.

Planning triggers — You should be thinking about this if…

• You were born in the UK and have emigrated to Australia — your domicile of origin is UK and may not have changed regardless of how long you have been in Australia.
• You retain UK property or significant UK assets while living in Australia — these remain within the UK IHT charge regardless of where you are domiciled.
• Your beneficiaries are split across the UK and Australia — the combined tax impact depends on both jurisdictions’ rules, assessed independently.
• You have significant superannuation and have not had specialist advice on how it interacts with UK IHT obligations.
• Your will was drafted by a UK solicitor before you emigrated — it may not be valid in Australia and may not reflect your current intentions.
• You are considering returning to the UK — any Australian domicile of choice may be abandoned, reviving your UK domicile of origin.

What this guide cannot tell you

• Whether you are UK-domiciled, Australian-domiciled, or in a contested position — this requires a detailed facts-and-circumstances analysis by a specialist in both jurisdictions.
• Whether you meet the UK deemed domicile threshold — this depends on your specific residence history.
• How your superannuation interacts with UK IHT — this depends on fund structure and trustee discretion.
• What the Australian CGT position would be on inherited assets — this depends on asset type, cost base, and timing of any disposal.
• Whether a gifting strategy or restructure would materially reduce your exposure — modelling requires full analysis in both jurisdictions simultaneously.