Navigating Expat US Tax, Double Taxation US UK, and FBAR Requirements: Expert Insights from Xerxes Associates LLP

Living as a US expatriate in the UK can be an exciting adventure, but it also comes with unique financial responsibilities. One of the key challenges for expats is understanding and complying with the complex US tax requirements, avoiding double taxation, and staying on the right side of the law, especially when it comes to the Foreign Bank Account Report (FBAR). In this article, we’ll explore the essential aspects of Expat US Tax, the issue of double taxation in the US and UK, and demystify the concept of FBAR, with insights from Xerxes Associates LLP, trusted tax advisors specialising in assisting US expats in the UK.

Expat US Tax – A Crucial Obligation

US citizens and green card holders are required to report their worldwide income to the Internal Revenue Service (IRS), regardless of where they live. This means that even if you’re residing in the UK, you are still subject to US tax laws. The intricacies of the US tax system can be daunting for expatriates, but that’s where expert guidance from firms like Xerxes Associates LLP comes into play.

Expat US tax advisors can help you navigate the complexities of the US tax code, taking into account the specific tax treaties between the US and the UK to minimise your tax liability and ensure full compliance. They can also assist in understanding the Foreign Earned Income Exclusion, Foreign Tax Credit, and other provisions that can help reduce your US tax burden.

Double Taxation US UK – A Potential Pitfall

One of the most significant concerns for US expats living in the UK is the possibility of double taxation, where both the US and UK governments may attempt to tax your income. To prevent this, tax treaties play a crucial role in determining which country has the primary taxing rights on specific types of income. For example, wages earned in the UK by a US expat may be subject to UK tax, but the tax treaty can ensure that you receive a credit for those taxes when you file your US tax return.

Xerxes Associates LLP specialises in assisting clients in navigating the intricate web of international tax treaties to avoid double taxation, ensuring that you only pay the taxes you owe in one country while complying with the tax laws of both.

What Is FBAR and Why Does It Matter?

FBAR, or the Foreign Bank Account Report, is a mandatory filing requirement for US citizens, green card holders, and even US residents with foreign financial accounts exceeding $10,000 at any point during the year. Failure to report foreign accounts can result in severe penalties.

Xerxes Associates LLP emphasises the importance of understanding FBAR requirements and helping US expats in the UK comply with this regulation. By identifying foreign accounts that need to be reported and ensuring timely submission of the necessary forms, they help expats avoid hefty penalties that can arise from non-compliance.


Living as a US expat in the UK is a rewarding experience, but it comes with the responsibility of navigating complex tax regulations. Expat US tax, double taxation issues, and FBAR compliance are crucial aspects that require expert guidance to ensure that you meet your obligations and minimise your tax liability. For US expats in the UK, Xerxes Associates LLP stands as a trusted partner, providing invaluable insights and assistance in addressing these challenges. With their expertise, you can enjoy the benefits of life abroad while ensuring that your financial affairs remain in good standing on both sides of the Atlantic.

Contact us via or fill out our contact form to discuss your expat tax situation with us.

Read more here: Xerxes US Expats Living & Working in the UK Blog.