How The US-UK Estate Tax Treaty Prevents Double Taxation And Where It Fails

Imagine doing everything right: building a life across borders, buying property, investing carefully, supporting your family, and assuming the US-UK estate tax treaty will prevent double taxation when you’re gone. Then your heirs learn the worst-case math: two governments with 40% rates and two different ways of deciding who gets to tax what. We unpack how that nightmare happens for US citizens in the UK and why it’s more common after the UK’s April 2025 shift to a strict long-term resident test for UK inheritance tax.We start with the “two laws of physics” problem. The United States ties federal estate tax to citizenship and worldwide assets, while the United Kingdom ties inheritance tax to residence and now pulls in worldwide wealth once you’ve been resident 10 out of the last 20 tax years. That clash sets the stage for the 1980 US-UK estate and gift tax treaty: the Article 4 treaty domicile tiebreakers, the way situs rules handle US real estate versus intangible accounts, and the Article IX foreign tax credit system that’s meant to keep you from paying twice.Then we get to the 2026 twist that catches smart people off guard: the “zero credit trap.” When a higher US estate tax exemption pushes your US tax bill to $0, your treaty credit can also be $0, even while HMRC calculates a full UK inheritance tax charge on the same asset. We also talk practical cross-border estate planning moves, including gifting strategies, marital planning, and why common US trust structures can become risky under UK treatment and long-term resident rules.If you have US assets, UK residence, or family on both sides of the Atlantic, this is the episode to pressure-test your plan. Subscribe, share this with a friend who’s moved abroad, and leave us a review with your biggest US-UK inheritance tax question so we can tackle it next.You can find more information in the article "US and UK Estate and Gift Tax Considerations for a US Citizen Resident of the UK with US Assets". If you have questions, contact us.Send us Fan MailMoving, Working, and Investing for Americans Abroad