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One of the biggest risks for US expats living in the UK is falling behind on tax filing deadlines. Whether it’s your US return, FBAR, or UK self-assessment, missing a deadline can result in serious fines, interest charges, and even IRS scrutiny.

Living in the UK as a US expat brings exciting opportunities — but it also brings complex tax obligations. With both the IRS and HMRC expecting accurate reporting, staying tax efficient is essential if you want to avoid overpaying or triggering audits.

One of the most common misconceptions among US expats in the UK is that filing taxes in the UK alone is enough. Unfortunately, the US is one of the only countries in the world that taxes its citizens on worldwide income, no matter where they live.

If you’re a US citizen or green card holder residing in the UK, the chances are high that you fall under the reporting obligations for FBAR (Foreign Bank Account Report) and FATCA (Foreign Account Tax Compliance Act).

Frequently Asked Questions – Xerxes Associates LLP

What USA Expats Should Look Out for When Appointing a US & UK Tax Specialist in the UK

Double Taxation Relief Explained: How Xerxes Associates LLP Helps US Expats in the UK

Xerxes Associates LLP, a leading advisory firm for international professionals and US expats in the UK, breaks down what’s new, what’s stayed the same, and how to stay compliant while protecting your wealth.

As the UK’s tax year draws to a close, thousands of individuals – from freelancers and landlords to company directors and expats – are bracing for the annual challenge of completing their Self Assessment Tax Return. For many, the complexities of tax codes, allowances, and HMRC deadlines can turn tax season into a minefield. Fortunately, the expert accountants at Xerxes Associates LLP are helping individuals across the UK and abroad navigate the process with precision, clarity, and peace of mind.

The rise of cryptocurrencies has introduced new complexities in tax compliance, particularly for US and UK expatriates. Many investors mistakenly believe that profits from crypto activities are tax-exempt; however, both the IRS and HMRC have clarified that gains from cryptocurrency transactions are subject to taxation. Xerxes Associates LLP, a London-based firm of chartered accountants and tax advisors, offers specialised services to help clients understand and meet their crypto tax obligations.Xerxes Associates LLP+8Xerxes Associates LLP+8Xerxes Associates LLP+8Xerxes Associates LLP

The United Kingdom’s tax system can be challenging for U.S. citizens working in the UK. Understanding key components such as the tax year structure, filing deadlines, and the Pay As You Earn (PAYE) system is crucial for ensuring compliance and optimising tax obligations.​

The complexities of international taxation requires expertise and a personalised approach. Xerxes Associates LLP, based in London, stands as a beacon of proficiency in both UK and US tax matters, offering a comprehensive suite of services tailored to the unique needs of expatriates.​

The intricacies of both U.S. and U.K. tax systems can be challenging for individuals and businesses alike. Xerxes Associates LLP, based in London, offers comprehensive tax advisory services tailored to meet the unique needs of clients dealing with cross-border taxation issues.

Xerxes Associates LLP offers a wide array of services designed to meet the unique needs of expatriates

For US expatriates residing in the UK, staying informed about the latest tax regulations is crucial to ensure compliance and optimise tax liabilities. The Internal Revenue Service (IRS) has recently released the tax inflation adjustments for the tax year 2025, introducing several changes that may impact US expats.

Expert US-UK Tax Services: Xerxes LLP, The Leading Authority for US Expats in the UK

For US expatriates residing in the UK, navigating the complexities of US tax compliance while adhering to UK tax regulations can be a daunting challenge. With the IRS (Internal Revenue Service) requiring US citizens to file taxes regardless of their residence, understanding the dual tax obligations and avoiding penalties is crucial.

Moving to the United Kingdom for work is an exciting step, but understanding the local tax system can be daunting, especially for U.S. citizens used to the complexities of dual taxation. This guide simplifies the basics of UK taxes and helps you stay compliant while optimising your financial situation.

Living as a U.S. expat in the UK brings exciting opportunities but also unique financial challenges, especially when it comes to taxes. As of 2025, compliance with U.S. tax obligations remains critical for expatriates, and understanding key concepts such as dual taxation, reporting requirements, and available exclusions can save you time, stress, and money.

Managing tax obligations across borders is no small task, especially for US citizens residing in the UK. Xerxes Associates LLP specialises in offering comprehensive US expat tax services in the UK to ensure that clients meet their tax requirements efficiently and accurately. With expertise in filing US taxes from the UK and understanding UK tax implications, our team is dedicated to providing tailored solutions for American expats, helping to minimise liabilities while ensuring full compliance with both IRS and HMRC regulations.

Tax obligations across borders can be challenging, especially for expats. Xerxes Associates LLP, a leading US-UK tax accountant firm, offers specialised expat tax advice in the UK for US citizens, green card holders, and those with dual residency. Our dedicated US tax advisors in the UK help clients address complex tax requirements, minimise tax liabilities, and maintain compliance with both UK and US tax regulations.

Navigating the complexities of US taxes on foreign income and compliance requirements for US expats in the UK can be overwhelming. Xerxes Associates LLP specialises in US/UK tax advice, providing tailored solutions that simplify the process for US citizens and dual residents. With a focus on strategic tax planning and compliance, our team of expert advisors ensures that US expats can meet their tax obligations while maximising benefits from both tax systems.

Navigating the complexities of US tax obligations while living in the UK can be challenging. With many individuals and businesses in London seeking experienced guidance for their US tax returns and broader tax planning needs, Xerxes Associates LLP stands out as a trusted choice. Specialising in cross-border tax compliance, Xerxes Associates LLP offers a comprehensive suite of services to help clients manage their US tax returns in London effectively, ensuring both compliance and strategic financial benefits.

Whether you’re an individual with cross-border tax obligations or a family navigating complex international regulations, you deserve a bespoke approach that not only addresses your specific requirements but also provides full transparency on costs.

In this article, we will explore the multifaceted aspects of UK-US tax advisory services, outlining why you should trust Xerxes Associates LLP to handle your cross-border tax obligations.

Xerxes Associates LLP, a leading tax and business advisory firm based in London, offers specialised services for U.S. expatriates living in the UK. The firm is committed to transparency and client satisfaction, which is reflected in its clear and structured fee packages.

Xerxes Associates LLP is a leading London-based tax advisory and business consulting firm, renowned for its expertise in navigating the complex tax landscapes of both the United States and the United Kingdom.

Xerxes Associates LLP boasts a team of highly qualified tax advisors and business consultants with extensive knowledge in US and UK tax laws. Our professionals are equipped with the expertise needed to handle even the most complex tax scenarios.

Navigating the complex world of tax requirements can be particularly challenging for US expats living and working in London. Xerxes Associates LLP is here to simplify this process, offering comprehensive tax advice services tailored to the unique needs of US citizens residing in the UK.

In-Depth Overview of Xerxes Associates LLP’s Tax Services For US Expats

Commonly Asked Tax Questions By US Expats Working In The UK

UK & US Tax Accountants & Advisers: Xerxes Associates LLP

The Benefits of Hiring a Tax Accountant for US Citizens Employed in the UK

In light of the global development and implementation of information-sharing legislation (for instance, FATCA which mandates financial entities to disclose details about US account holders to the IRS)

It’s common knowledge in the realm of expat taxation that U.S. citizens residing abroad encounter a range of unique tax challenges and opportunities. This holds particularly true for self-employed expats

In a positive development for the American expatriate community, the U.S. Supreme Court has delivered a ruling that favours taxpayers and limits the scope of FBAR (Foreign Bank Account Report) penalties.

Working as a US expat in the UK can be an exciting opportunity, but it also comes with its own set of tax implications. In this article, we’ll explore some of the tax benefits available

Filing taxes can be confusing and complicated as it is, but when you are not living in your native country, the process becomes all the more complex.

Filing taxes can be confusing and complicated as it is, but when you are not living in your native country, the process becomes all the more complex.

Filing taxes can be confusing and complicated as it is, but when you are not living in your native country, the process becomes all the more complex.

Filing taxes can be confusing and complicated as it is, but when you are not living in your native country, the process becomes all the more complex.

This article is specifically devoted to US/UK dual citizens and their taxation queries. If you are a dual citizen of these two countries, you do owe taxes to both these countries.

If you are an American working in the UK, you probably have heard how overwhelming US tax processes can get. Besides worrying about the elaborate procedures to file your US taxes, other questions that could haunt you are as follows:

As an American living and working in London and or anywhere in the UK, you might get baffled by the US and UK tax processes. Even getting started can sometimes be overwhelming especially if it is your first time.

If you are a US expat living in the UK, you have to file US taxes every year and report the money you have in foreign banks with the help of the Foreign Bank Account Report (FBAR).

Xerxes Associates LLP makes filing US income taxes for US expats living abroad seamless and simple. We understand the dynamics of being a US citizen living abroad in countries like the UK and cities such as London.

US Tax Return London. Are you A US Expat Living Abroad & Haven’t Filed Your Taxes? You might be living overseas and concerned that you haven’t filed US taxes.

There are a variety of expat services available however, Xerxes Associates LLP offers you a premium and efficient service which has made us the number one choice for U.S. expats living in the UK.

No matter where they live, U.S. citizens and residents pay taxes on their worldwide income. Therefore, you must also report any income you report on your UK return on your US return.

A PAYE system is used by most UK employers to withhold taxes from employees’ paychecks.
You will need to file a UK tax return if ‘any’ of the following applies to you;

Xerxes Associates LLP have been preparing US taxes for Americans living in the UK for over 20 years. We are experts in all aspects of US tax procedures and we offer a professional, responsive and personalised service to all US and UK expats. Every US citizen including Green Card holders (equivalent to a permanent stay [...]

Who Can Provide US Expats With Expat Accountant Service And Expat Tax Assistance? Xerxes Associates LLP are expert specialist US & UK tax accountants and advisers based in London with over 10 years of valuable experience. As US and UK tax accountants, we offer a professional, responsive and personalised service to all US and UK [...]

What Is A FBAR And Who Needs To File One? An FBAR form must be filed by all U.S. citizens, residents, corporations, partnerships, limited liability companies, trusts, and estates. The purpose of an FBAR is to notify a financial interest in a bank account including any type of authority over a financial account which is [...]

The IRS sends millions of notices to taxpayers every year. Reasons for sending these letters vary. The following list contains ten simple steps you should take when this notice arrives. 1. It shouldn't be ignored. The IRS mostly sends letters and notices in connection with federal tax returns. The letter or notice will tell you [...]

What are the most common reasons for not filing an IRS Tax extension? - IRS may raise a red flag when you extend, increasing your audit risk - I'm always late filing my tax returns - I may be late in October as well if I file an extension. - Everything I need for my [...]

Is it necessary to file a 1040 if my income is below the Foreign Earned Income Exemption (FEIE)? If the total income of a US citizen exceeds the standard deduction and exemption, you are required to file a US tax return. It is likely that there will be no tax due if the total income [...]

From simple to complex situations, we work with taxpayers from all over the United States who live in London or other parts of the UK. We at Xerxes Associates LLP make the process of filing US income taxes for expats living in the UK, seamless and refreshingly simple. We have certified tax advisors who are [...]

Xerxes Associates LLP provides US expats living in the United Kingdom with a range of tax filing services to meet your specific needs. Whether it’s preparing your US tax return or advising you on UK tax implications, our London based team of dedicated tax experts understand the complexities of expat tax. Citizens and permanent residents [...]

As an expat living in the UK, you might be concerned that you have not filed your US taxes. The following reasons may encourage you to make tax compliance a priority. - You must file US taxes even when earning income overseas. - If you owe US taxes, it could cause problems for your passport [...]

Strict US tax laws affect US expats living abroad and as a consequence employees and individuals need specialised advice from local tax experts such as Xerxes Associates LLP, to navigate US tax law minefields. Located in London, our US and UK tax advisors are ideally positioned to advise clients who are based in the UK [...]

US tax responsibilities If you remain a citizen or permanent resident of the United States while living in the UK, then you must file an annual US tax return with the US federal government based on your worldwide income. If you have assets outside the US, you may be required to file additional informational returns. [...]

US residents living in the UK are in safe hands with Xerxes Associates LLP with matters related to expat taxes (tax imposed on expatriates). Our team of dual qualified US and UK tax professionals specialise in preparing individual tax returns for US and UK residents and provide bespoke personal tax advice tailored to your unique [...]

Whether you are a US Expat already living in the UK, a US citizen looking to invest in the UK, or are a US citizen considering a new job opportunity to work in the UK, the interaction between the two countries' tax systems can be very confusing. The best way to structure your affairs in [...]

Do American Citizens Living In London Need to Pay Taxes? In short, Yes! If you are an American living in London or the UK, you must file a US tax return and pay US taxes on your British income. You are subject to the same rules when it comes to income taxation as Amercians are [...]

Expats are often required to file and pay taxes in both the US and their country of residence because you are required to file and pay US taxes on worldwide income, no matter where you live or work. By using special tax credits and exclusions for living abroad that the IRS has put in place [...]

Xerxes Associates LLP is an expert team of experienced US and UK tax accountants and advisors based in London. We specialise in meeting the needs of private clients and their businesses. We offer a cost-effective tax advisory service for US citizens and residents from our London offices. Our US tax department is overseen by our [...]

Being an expat in the UK can be very difficult - especially when you have to deal with the U.S tax process. Working with us makes it much easier! That's why we are working hard to earn your trust. Our team works seamlessly, which means you only have to focus on what matters most - [...]

HMRC issues tax return forms to individuals working in the UK. If you have other incomes such as self-employment and/or investment income, then you will need to file a tax return and pay the taxes on those additional income streams. You will also need to file a tax return if; - If you have income [...]

The UK tax system is known as Her Majesty's Revenue & Customs or HMRC for short. HMRC operates as the Government tax collection agency for the United Kingdom. HMRC also helps regulate governmental policies such as national minimum wage and state support and welfare. Key points to remember; - The UK tax year falls between [...]

Xerxes Associates LLP are expert specialist UK & US tax advisers based in London with over 10 years of valuable experience. As UK and US Tax Accountants, we offer a professional, responsive and personalised service to all US and UK expats. As UK & US Tax Accountants, Xerxes Associates LLP offer more than just the [...]