Cross-Border Property Planning for US Citizens: Insights from Middleton Advisors’ Tax Series Webinar

Written by James Sellon, CFA, CFP™

Recently, I had the pleasure of joining a discussion hosted by Middleton Advisors as part of their Tax Series, alongside my colleague Terence Sivakumar and Ashley Wilsdon, Head of London Buying at Middleton. The session was chaired by Juliette Stacey from the Middleton Advisory Board, and together we explored a topic that has become increasingly relevant: how US citizens can successfully navigate the financial and tax complexities of buying property in the UK.

With more American families relocating to the UK for education, career, and lifestyle reasons, I find myself having similar conversations with many clients around how to consider and structure UK property ownership in a way that avoids double taxation, unnecessary charges, and long-term inefficiencies.

Below are some of the principal insights shared during the session

Keep It Simple

Many Americans arrive in the UK with a desire for complex ownership structures, often through LLCs, companies, or trusts, because that is what makes sense back home. Unfortunately, these structures can create real problems across the US and UK tax systems.

US LLCs, for example, can be challenging from a cross-border tax perspective. They are often viewed as corporations by HMRC, which can lead to mismatches and double taxation. In most situations, I have found that the simplest structure, direct personal ownership, tends to be the most effective and tax efficient approach.

Overcomplicating ownership can result in unnecessary annual compliance fees, exposure to the Annual Tax on Enveloped Dwellings (ATED), and even being taxed twice on the same income or gain.

Dual Tax Obligations: Coordination Is Key

Being a US citizen abroad means dealing with two tax systems at once. You will always have to file with the IRS, no matter where you live, and once you have been in the UK for four years, you will also fall under UK tax on your worldwide income and gains.

This dual exposure does not have to be a hinderance, but success depends on proactive coordination between your US and UK advisers. Dual filing can work smoothly, but only if your advisers talk to each other and align strategies from the outset.

Understanding Entry Costs and the FIG Regime

The cost of entering the UK property market has risen sharply in recent years. Stamp Duty Land Tax (SDLT) can reach up to 12% on properties above £1.5 million, plus a 5% surcharge for additional homes and an extra 2% for overseas buyers. As Ashley rightly pointed out during our session, understanding these costs upfront is critical.

In addition, the High Value Council Tax Surcharge (HVCTS) was announced as part of the 2025 Autumn Budget. Coming into effect from 1 April 2028, properties worth more than £2 million will suffer a flat rate surcharge in line with the below table:

Property Value Threshold	HVCTS Rate
£2 – £2.5 million	£2,500
£2.5 – £3.5 million	£3,500
£3.5 – £5 million	£5,000
£5 million +	£7,500

The UK introduced a new Foreign Income and Gains (FIG) regime in April 2025, which offers up to four years of exemption from UK taxation on non-UK income and gains for individuals who have not been UK tax resident in the previous ten years.

For many Americans moving here, this regime provides valuable clarity. It gives newcomers time to plan effectively, perhaps rent first, and bring funds into the UK without immediate tax exposure. This can be helpful when needing to fund the up-front cost of SDLT. After the four year window, however, your global income and gains will come fully within UK scope, so ongoing reviews are essential to remain efficient.

Managing Money Flows and Currency Risk

Transferring money across borders is another area that requires caution. Bringing funds into the UK that include income or gains not previously taxed in the UK can inadvertently trigger a UK tax liability. Before moving any money, it is important to get specialist advice to ensure you do not create a taxable event by mistake.

Currency fluctuations can also have an unexpected tax impact. I have seen “dry” tax charges arise simply from loan repayments or refinancing during volatile exchange rate periods. Coordinating between your mortgage and tax advisers can go a long way toward reducing this risk.

Estate Planning: Bridging Two Systems

Estate planning is often where the biggest disconnect occurs between US and UK rules. While the US estate tax exemption is further increasing to $15 million for 2026, and to be adjusted for inflation annually thereafter, the UK inheritance tax threshold starts at just £325,000 or increases to £500,000 with the residence nil rate band.

For mixed nationality couples, the rules can become especially complex because the respective spousal exemptions do not automatically apply across jurisdictions. In many cases, I recommend dual wills, one compliant with US law and another with UK law, as the most practical and efficient solution.

Equally important is maintaining good records. Keep detailed documentation of your property’s purchase price, mortgage repayments, and any improvements. You will need this for accurate capital gains reporting in both countries.

The Value of Integrated Advice

If there is one takeaway from all of this, it is that early, holistic advice matters. Too often, people act first and ask questions later, whether it is buying a home, refinancing, or moving capital. But when advisers collaborate early, the outcome is almost always better: fewer surprises, lower costs, and greater long-term flexibility.

The UK remains a highly attractive destination for American buyers, but navigating its dual tax environment demands foresight, simplicity, and teamwork. With the right planning, the cross border challenges are entirely manageable, and the rewards of getting it right are significant.

The Legal Stuff

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Risk Warnings:

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Your capital is always at risk.
Fluctuation in currency exchange rates may cause the value of an investment and/or a portfolio to go up or down.
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