Introduction US and UK Tax Advisors who advise US citizens on the interaction between the UK non-dom position and US federal estate and gift tax must explain one counterintuitive fact: being non-domiciled for UK IHT purposes does not reduce a US citizen’s US federal estate tax exposure. The identical non-UK assets are still owned by […]
US and UK Tax Advisors who advise US citizens on the interaction between the UK non-dom position and US federal estate and gift tax must explain one counterintuitive fact: being non-domiciled for UK IHT purposes does not reduce a US citizen’s US federal estate tax exposure. The identical non-UK assets are still owned by a US citizen who has obtained non-dom status and is not subject to UK IHT on those assets. federal estate tax purposes. The non-dom position shields the assets from the UK 40 percent IHT charge. Still, the assets remain fully subject to the US federal estate tax at rates up to 40 percent, with no UK IHT credit available to offset that liability (because no UK IHT was charged).
This guide explains how US citizens in the UK who hold non-dom status manage their US estate and gift tax exposure — and how the interaction between the UK non-dom framework and the US estate and gift tax framework creates both planning opportunities and hidden traps. Visit our advisory service:
https://www.jungletax.co.uk/services/us-uk-tax/
US and UK Tax Advisors for non-dom estate tax planning understand both the UK non-resident, non-domiciled (non-dom) framework — which shields non-UK assets from UK IHT — and the US federal estate and gift tax framework — which applies to US citizens on their worldwide estate, regardless of UK non-dom status. For a US citizen in the UK with non-dom status, the two frameworks operate in parallel: the non-dom status shields the non-UK assets from UK IHT, but the US federal estate tax still applies to those same assets.
The IRS guidance on US citizens’ worldwide estate tax is at:
https://www.irs.gov/businesses/small-businesses-self-employed/estate-tax
A UK tax adviser can structure a non-dom plan that minimizes KIHT on non-UK assets — by confirming non-dom status, managing the UK-situs assets that remain in scope of UK IHT, and using the available exemptions and reliefs. They cannot advise whether the non-dom position creates or exacerbates US federal estate tax exposure — or whether a different UK structure might reduce the combined UK IHT and US estate tax exposure. A US estate planning attorney can plan for the US federal estate tax — but cannot advise whether the plan is consistent with the non-dom position or how the UK non-dom status affects the US estate tax credit. Only US and UK Tax Advisors who understand both systems simultaneously can optimize the combined position.
The US federal estate tax applies to the worldwide estate of every US citizen — including non-UK assets held by a UK non-dom. The same non-UK assets that are outside the scope of UK IHT (because of non-dom status) are fully subject to the US federal estate tax. The US federal tax rate is up to 40 percent on the taxable portion of the estate above the exemption threshold (USD 13.61 million in 2026, indexed annually). For a US non-dom in the UK with a worldwide estate of USD 20 million, the US federal estate tax exposure is approximately USD 2.544 million, and the non-dom status provides zero relief against that exposure.
The US allows a Foreign Tax Credit on foreign taxes paid on the same estate, but only to the extent the credit does not exceed the US federal estate tax on that same property. For a US non-dom in the UK, non-UK assets are outside the scope of UK IHT entirely — so no UK IHT is paid on those assets. No UK IHT means no FTC credit is available. The non-UK assets are subject to the full US federal estate tax with no credit offset.
Our guide to US estate tax exposure for US citizens in the UK is at:
https://www.jungletax.co.uk/jungle-tax-news-updates/us-and-uk-tax-advisors-estate-planning-non-dom/
A US non-dom in the UK can make gifts to UK beneficiaries that are outside the scope of UK IHT (no UK gift tax) — but the same gifts may still be subject to the US federal gift tax. The US annual gift exclusion (USD 18,000 per donee in 2026) applies, and gifts above that amount reduce the US lifetime exemption. A UK non-dom who makes significant gifts to UK beneficiaries — intending to reduce the UK IHT estate — may inadvertently use up their US lifetime exemption, reducing the exemption available for the eventual US federal estate tax.
The first step is to calculate the worldwide estate value and confirm whether it exceeds the US federal estate tax exemption threshold (USD 13.61 million in 2026). For US non-doms with significant worldwide wealth, the estate typically exceeds the US federal estate tax threshold, triggering US federal estate tax exposure. If the estate is below the threshold, no US federal estate tax arises regardless of the non-dom status.
The second step is separating the estate into UK-situs assets (which may be in scope of UK IHT even with non-dom status) and non-UK assets (which are outside the scope of UK IHT if non-dom status is confirmed). UK-situs assets include UK real property, UK-listed shares held directly, and UK bank accounts. Non-UK assets include US and other foreign investments.
The third step is modeling the UK IHT on the UK-situs assets (the portion in scope even with non-dom status) and the US federal estate tax on the worldwide estate. Then calculate the combined position — the total of UK IHT on UK-situs assets plus US federal estate tax on the worldwide estate, less any FTC credit available on the US side.
The fourth step is optimizing the trust or disposal structure to minimize the combined position. This may mean: disposing of certain UK-situs assets to stay below the UK nil-rate band, reducing the worldwide estate through pre-death gifting, establishing a US trust or dynasty structure, or using the non-dom position in combination with UK trust structures that benefit non-UK-domiciled beneficiaries.
Christopher is a US citizen. He has been a UK non-dom for six years. His estate: London property £2.1 million (in scope of UK IHT even with non-dom status), non-UK investments USD 8.5 million (outside scope of UK IHT due to non-dom status), and a US retirement account USD 1.2 million. Combined estate: approximately USD 14.2 million. Christopher is unmarried.
On the UK situs assets (London property £2.1 million), the UK IHT exposure is £844,000 (40 percent above the nil-rate band after exemptions). The non-UK assets (USD 8.5 million) are outside the scope of UK IHT. The total UK IHT exposure is therefore £844,000 only — much lower than if Christopher were UK domiciled (which would trigger worldwide UK IHT of approximately £2.4 million).
On the worldwide estate (USD 14.2 million), the US federal estate tax applies to the amount above the exemption (USD 13.61 million in 2026). The taxable estate is approximately USD 590,000. The US federal estate tax rate of 40 percent is approximately USD 236,000. But this is deceptively low because the exemption is temporary and sunsets after 2026 — in 2027, the exemption falls to USD 7 million (approximately), and the taxable estate would jump to USD 7.2 million, producing a US federal estate tax of approximately USD 2.88 million.
Jungle Tax recommended accelerating gifts in 2026 — the final year of the USD 13.61 million exemption. Christopher made gifts of USD 1.5 million to a US charitable donor-advised fund (in 2026) and assigned USD 1.2 million of the retirement account to a US charitable remainder trust (over 2026–2027). These actions reduced the worldwide estate to approximately USD 11.5 million — permanently below the exemption cliff that arrives in 2027. The US federal estate tax exposure was eliminated. The non-dom status continued to shield the non-UK assets from UK IHT. The combined estate-planning position was optimized for both systems.
The most common mistake is assuming that non-dom status — which shields non-UK assets from UK IHT — also reduces the US federal estate tax on the same assets. It does not. Non-UK assets are still subject to the full US federal estate tax at rates up to 40 percent
A non-dom plan that minimizes UK IHT (by holding non-UK assets outside UK IHT scope) may create or exacerbate the US estate tax exposure. The combined position must be modeled—not just the UK side.
The current USD 13.61 million exemption is temporary. In 2027, the exemption is scheduled to fall to approximately USD 7 million — unless Congress extends the higher exemption. Many HNW clients are unaware of the scheduled cliff. Planning actions to reduce the estate below the 2027 exemption level must be completed in 2026.
Pre-death gifts are outside the UK IHT scope if the donor survives for seven years — but gifts above the US annual exclusion amount reduce the US lifetime exemption, thereby reducing the exemption available for the eventual estate tax. The adviser models the gift tax consequence before recommending gifting as a planning action.
The IRS guidance on the 2026 exemption and post-2026 rules is at:
https://www.irs.gov/taxtopics/tc708
Jungle Tax is a specialist US-UK cross-border tax advisory firm with US and UK Tax Advisors who include IRS Estate Tax experts and UK-qualified IHT advisers experienced in non-dom estate planning. We calculate the combined UK IHT and US federal estate tax exposure on the worldwide estate. We model the impact of the non-dom status on both the UK IHT and US estate tax positions. We identify planning opportunities to reduce the combined exposure — including pre-death gifting in 2026 before the exemption cliff, charitable transfers, and trust structures that optimize both UK IHT and US federal estate tax.
Read our guide to US estate tax exposure for US citizens in the UK:
https://www.jungletax.co.uk/jungle-tax-news-updates/us-and-uk-tax-advisors-estate-planning-non-dom/
Non-dom estate tax planning for US citizens requires US and UK Tax Advisors who model both the UK IHT exposure (on UK-situs assets in scope even with non-dom status) and the US federal estate tax exposure (on the worldwide estate, regardless of non-dom status) — and who optimise the combined position by using the non-dom advantage to shield non-UK assets from UK IHT, while simultaneously planning the US estate tax through the available federal exemption and charitable mechanisms.
Three points matter most. First, non-dom status shields non-UK assets from UK IHT — but does not reduce the US federal estate tax on those same assets. Second, the combined UK IHT and US estate tax exposure must be calculated — not just the UK side. Third, the 2027 US federal exemption cliff (from USD 13.61 million to USD 7 million) requires planning in 2026 for HNW clients who wish to reduce their estates below the 2027 threshold permanently.
Jungle Tax | hello@jungletax.co.uk | 0333-8807974 | https://www.jungletax.co.uk
No. The US federal estate tax applies to your worldwide estate regardless of your UK domicile status. Non-dom status shields non-UK assets from UK IHT — but the US applies its 40% estate tax rate to those same non-UK assets.
Only if UK IHT was actually paid on those assets, Non-UK assets are outside UK IHT scope with non-dom status — so no UK IHT is paid on them, and no FTC is available.
USD 13.61 million in 2026, indexed annually. In 2027, it is scheduled to drop to approximately USD 7 million unless Congress extends the higher amount. Plan in 2026 for the cliff.
Not if you are non-dom and giving to non-UK-domiciled beneficiaries — gifts are outside UK scope. But the US federal gift tax may still apply — gifts above USD 18,000 per donee reduce your US lifetime exemption.
Potentially — but only after confirming the gift tax consequences and whether the gifts serve your overall estate planning goals: a specialist models the consequences in both the UK and the US before recommending gifting.
Trusts can be useful for IHT planning — but the trust structure must be structured to avoid triggering US grantor trust or estate tax inclusion consequences. Specialist advice is required before establishing a trust.
