UK-US CROSS-BORDER TAX SPECIALIST
Navigating the UK-US tax landscape is one of the most complex challenges any taxpayer can face. From ISAs that lose their tax-free status under US law to UK pensions that trigger trust reporting requirements, British-American dual citizens and UK expats living in the United States face a web of overlapping obligations that most tax preparers simply do not understand. Qorri Tax provides specialized, year-round support for every aspect of UK-US cross-border taxation.
Free 15-minute call. No commitment. Completely confidential.
The United States is one of only two countries in the world that taxes its citizens on worldwide income, regardless of where they live. This means that if you are a US citizen, a green card holder, or meet the substantial presence test, you must file a US federal income tax return every year, reporting all income earned anywhere in the world. For UK expats and British-American dual citizens, this creates a dual filing obligation that touches nearly every aspect of financial life.
The UK tax system, administered by HM Revenue and Customs (HMRC), operates on fundamentally different principles from the US system managed by the Internal Revenue Service (IRS). The UK tax year runs from 6 April to 5 April, while the US tax year follows the calendar year from 1 January to 31 December. Income categories, allowable deductions, and tax rates differ significantly between the two jurisdictions. What qualifies as a tax-advantaged account in the UK may receive no special treatment whatsoever under US tax law, and certain UK investment vehicles can trigger punitive US tax consequences that most taxpayers never anticipate.
British-American dual citizens face a particularly difficult set of challenges. Many acquired US citizenship at birth through a parent but grew up entirely in the UK, unaware of their US filing obligations until they attempted to open a bank account, apply for a mortgage, or travel to the United States. Others are UK nationals who moved to the US for work, obtained green cards, and now hold financial accounts in both countries. In every scenario, the interplay between UK and US tax rules creates complexity that requires deep expertise in both systems.
Common issues include the US taxation of UK Individual Savings Accounts (ISAs), the classification of UK investment funds as Passive Foreign Investment Companies (PFICs), the reporting of UK pension schemes as foreign trusts, and the requirement to file Foreign Bank Account Reports (FBARs) and FATCA disclosures for UK financial accounts. Each of these issues carries significant penalties for noncompliance, making it essential to work with a tax professional who understands both sides of the Atlantic.
At Qorri Tax, we specialize in exactly this type of cross-border work. Tajma Qorri has spent over a decade handling complex international tax matters at top-tier accounting firms and now brings that experience directly to individual clients facing UK-US tax challenges. Whether you are a longtime dual citizen who has never filed US returns, a recent transplant navigating your first year of dual reporting, or a US citizen returning home after years in the UK, we have the expertise to guide you through every step.
UK pensions are among the most misunderstood topics in cross-border tax planning. The UK offers several types of pension arrangements, including the State Pension, workplace pensions (both defined benefit and defined contribution), personal pensions, and Self-Invested Personal Pensions (SIPPs). Each type raises distinct US tax questions, and getting them wrong can lead to double taxation, missed reporting deadlines, and substantial IRS penalties.
The UK State Pension is funded through National Insurance contributions and provides a regular income in retirement. For US tax purposes, UK State Pension payments are generally treated as social security benefits. Under the US-UK Income Tax Treaty, specifically Article 17, these payments are typically taxable only in the country of residence. This means that if you live in the United States and receive a UK State Pension, the payments are generally taxable in the US but exempt from UK tax. However, treaty elections must be properly claimed on your US return using Form 8833 to secure this treatment.
Workplace pensions and personal pensions present a more complex picture. Contributions made by a UK employer to a qualifying pension scheme may be excludable from US income under the treaty, but only if the pension meets certain requirements and the proper elections are filed. Distributions from these pensions are generally taxable as ordinary income in the US when received, and the timing of taxation can differ from the UK treatment.
SIPPs are particularly problematic from a US perspective. A SIPP is a type of personal pension that gives the holder wide discretion over investment choices. The IRS may treat a SIPP as a foreign grantor trust, which triggers annual reporting obligations on Forms 3520 and 3520-A. These forms are due annually and carry penalties of $10,000 or more per form for late or incomplete filings. Many UK expats are completely unaware of these requirements until they receive an IRS notice.
Further complicating matters, the investments held inside a SIPP may themselves trigger additional US reporting. If the SIPP holds UK-domiciled funds such as OEICs or unit trusts, those funds are likely classified as PFICs under US law, requiring annual Form 8621 filings for each fund. The combination of trust reporting for the SIPP wrapper and PFIC reporting for the underlying investments can result in a substantial compliance burden and significant tax preparation costs.
Proper planning is essential. With the right treaty elections, foreign tax credit claims, and reporting strategy, it is possible to minimize double taxation on UK pension income while remaining fully compliant with both HMRC and the IRS. Our team has extensive experience navigating every type of UK pension arrangement and can help you develop a strategy that protects your retirement savings on both sides of the Atlantic.
For a deeper look at Form 3520 requirements, visit our dedicated service page.
Individual Savings Accounts (ISAs) are one of the most popular savings and investment vehicles in the United Kingdom. They come in several varieties, including Cash ISAs, Stocks and Shares ISAs, Innovative Finance ISAs, and Lifetime ISAs. Under UK law, all income and capital gains generated within an ISA are completely tax-free. There is no requirement to report ISA income on a UK self-assessment tax return, and ISA providers do not issue tax certificates for the income earned inside these wrappers.
However, the United States does not recognize the tax-exempt status of ISAs. There is no provision in the US-UK Income Tax Treaty that extends the UK's ISA tax exemption to US taxpayers. This means that for US citizens, green card holders, and anyone else required to file a US tax return, all interest, dividends, and capital gains earned inside an ISA are fully taxable in the United States in the year they are earned. This is true regardless of whether the funds are withdrawn from the ISA.
Cash ISAs are the simplest case. Interest earned in a Cash ISA must be reported as ordinary interest income on your US federal return. Because the UK does not tax this income, there is no foreign tax credit available to offset the US tax liability. The result is that Cash ISA interest is taxed at your full US marginal rate, which can be significantly higher than the zero percent rate you enjoy in the UK.
Stocks and Shares ISAs present a far more serious problem. These ISAs typically hold UK-domiciled funds, including Open-Ended Investment Companies (OEICs), unit trusts, and exchange-traded funds (ETFs) domiciled outside the United States. Under US tax law, most of these funds are classified as Passive Foreign Investment Companies (PFICs). The PFIC tax regime is one of the most punitive in the entire Internal Revenue Code. Unless a specific election is made, gains on PFIC shares are taxed at the highest ordinary income rate regardless of how long the shares were held, and an additional interest charge is applied to the tax liability for each year the investment was held. Each PFIC position requires a separate Form 8621 filing, and the calculations involved are extraordinarily complex.
Lifetime ISAs, which are designed to help UK residents save for their first home or retirement, create the same issues. Contributions receive a 25 percent government bonus in the UK, but the US does not recognize this bonus as tax-exempt. It must be reported as income on your US return. Any investments held within a Lifetime ISA that qualify as PFICs will trigger the same punitive tax treatment described above.
If you hold ISAs and are subject to US tax obligations, it is critical to evaluate your position as soon as possible. In many cases, the ongoing compliance costs and adverse tax treatment make it worthwhile to consider restructuring your investments into US-compliant alternatives. We can help you assess the tax impact of your current ISA holdings, prepare the required US filings, and develop a plan to transition your portfolio into a more tax-efficient structure for someone in your cross-border situation.
Learn more about Form 8621 and PFIC reporting on our dedicated service page.
The Passive Foreign Investment Company (PFIC) rules are among the most feared provisions in US tax law, and for good reason. Any non-US fund that derives 75 percent or more of its gross income from passive sources (such as dividends, interest, rents, and capital gains) or holds 50 percent or more of its assets in passive income-producing investments is classified as a PFIC. Virtually all UK-domiciled investment funds meet this definition, including OEICs (Open-Ended Investment Companies), unit trusts, investment trusts, and UK-domiciled ETFs.
The default PFIC tax regime under Section 1291 of the Internal Revenue Code is intentionally punitive. When a US taxpayer sells PFIC shares at a gain, the gain is allocated ratably over the entire holding period. The portion allocated to the current year is taxed at ordinary income rates. The portions allocated to prior years are taxed at the highest marginal rate in effect for each prior year, and an interest charge is added on top to reflect the deferral of tax. This means that even a modest gain can result in an effective tax rate well above 50 percent. Losses on PFIC shares are generally not deductible against ordinary income.
There are two alternative tax regimes that can reduce the impact of the PFIC rules, but each comes with significant requirements. The Qualified Electing Fund (QEF) election requires the fund to provide the US taxpayer with an annual PFIC Annual Information Statement. Most UK fund managers do not provide this statement and have no obligation to do so, making the QEF election impractical for the majority of UK investments. The Mark-to-Market election is available for PFIC shares that are traded on a qualifying exchange. Under this election, the taxpayer reports the increase (or decrease) in the fair market value of the shares each year as ordinary income (or ordinary loss, subject to limitations). While this avoids the punitive Section 1291 calculations, it requires the taxpayer to recognize income annually even if no distributions are received and no shares are sold.
Each PFIC position requires a separate Form 8621 to be filed with the taxpayer's annual return. For a UK expat holding multiple funds across an ISA, a workplace pension, and a personal brokerage account, it is not uncommon for a single tax return to require ten or more Form 8621 filings. The data collection, calculations, and form preparation for PFIC reporting are among the most time-intensive and technically demanding tasks in cross-border tax compliance.
If you hold UK investment funds and are subject to US taxation, we strongly recommend a comprehensive portfolio review. In many cases, liquidating PFIC positions and reinvesting in US-domiciled mutual funds or ETFs can dramatically simplify your compliance obligations and reduce your overall tax burden going forward. The decision to liquidate must be carefully timed and analyzed, as the sale itself will trigger PFIC tax consequences that need to be managed strategically.
Our team has prepared hundreds of Form 8621 filings and understands the nuances of each PFIC tax regime. We can analyze your portfolio, calculate the tax cost of each option, and help you make an informed decision about how to restructure your investments for long-term compliance efficiency. Visit our Form 8621 (PFIC) service page for more detail.
The United States and the United Kingdom have maintained a comprehensive income tax treaty since 1975, with the current version entering into force in 2003 and amended by protocol in 2004. This treaty is one of the most detailed bilateral tax agreements in the world and covers a wide range of income types, including employment income, business profits, dividends, interest, royalties, pensions, and capital gains.
One of the most important features of the US-UK treaty is the foreign tax credit mechanism. Article 24 of the treaty ensures that US citizens and residents who pay UK income tax can generally claim a credit against their US tax liability for the UK taxes paid. This credit is intended to prevent double taxation, although it does not always eliminate it entirely. The US foreign tax credit is limited to the US tax attributable to foreign-source income, and differences in how the two countries categorize and time income can result in situations where full relief is not available in a single year. Excess credits may be carried back one year or forward ten years.
The treaty's "saving clause" in Article 1(4) is critical for dual citizens and US residents. The saving clause preserves the right of each country to tax its own citizens and residents as if the treaty did not exist. This means that US citizens living in the UK cannot use the treaty to avoid US taxation on their worldwide income. However, certain treaty benefits survive the saving clause, including benefits related to pension contributions, social security payments, and the elimination of double taxation through credits.
Treaty elections are made using Form 8833, Treaty-Based Return Position Disclosure. Filing this form correctly is essential to claim reduced withholding rates, pension exemptions, and other treaty benefits. Failure to file Form 8833 when required can result in penalties and the disallowance of treaty-based positions on your return.
Other key treaty provisions include Article 17 (pensions and annuities), Article 17A (social security), and Article 14 (income from employment). Each of these articles contains specific rules about which country has the primary right to tax certain types of income and how relief from double taxation is provided. Proper application of these provisions requires detailed knowledge of both the treaty text and each country's domestic tax law.
At Qorri Tax, we routinely prepare treaty-based return positions for UK-US taxpayers and ensure that every available treaty benefit is properly claimed and disclosed. If you are unsure whether you are taking full advantage of the US-UK treaty, contact us for a review.
US persons with financial accounts in the United Kingdom must comply with two separate reporting regimes: the Foreign Bank Account Report (FBAR) and the Foreign Account Tax Compliance Act (FATCA). These regimes have different thresholds, different filing requirements, and different penalties, but they often overlap for the same set of UK accounts.
The FBAR, formally known as FinCEN Form 114, must be filed by any US person who has a financial interest in or signature authority over one or more foreign financial accounts if the aggregate value of all foreign accounts exceeds $10,000 at any point during the calendar year. The $10,000 threshold applies to the combined total of all foreign accounts, not to each account individually. UK bank accounts, building society accounts, ISAs, pension accounts, and investment accounts all count toward this threshold. The FBAR is filed electronically through the BSA E-Filing System and is due on April 15 each year, with an automatic extension to October 15. Penalties for willful failure to file an FBAR can reach the greater of $100,000 or 50 percent of the account balance per violation. Even non-willful penalties can be as high as $10,000 per account per year.
FATCA reporting is accomplished through Form 8938, Statement of Specified Foreign Financial Assets. This form is filed with your annual income tax return and has higher thresholds than the FBAR. For taxpayers living in the United States, the filing threshold is $50,000 in total foreign financial assets at the end of the year, or $75,000 at any point during the year (these thresholds double for married taxpayers filing jointly). For taxpayers living abroad, the thresholds are significantly higher: $200,000 at year-end or $300,000 at any point during the year ($400,000 and $600,000 for joint filers). Form 8938 covers a broader range of assets than the FBAR, including foreign stock, securities, and interests in foreign entities, in addition to foreign financial accounts.
Many UK expats and dual citizens are unaware of these requirements until they receive a letter from their UK bank notifying them that their account information has been shared with the IRS under FATCA's automatic exchange agreements. At that point, it is critical to act quickly to come into compliance. The IRS Streamlined Filing Compliance Procedures offer a path to catch up on past-due FBARs and tax returns without the risk of willful penalties, provided certain eligibility requirements are met.
Learn more about our FBAR filing services and Form 8938 (FATCA) reporting.
Every UK-US tax situation is different. Here are some of the most common scenarios our clients bring to us, along with a brief overview of the issues involved.
Sarah moved from London to New York for work in 2022. She holds a Cash ISA, a Stocks and Shares ISA with three UK fund holdings, and a workplace pension through her former employer. She obtained a green card and now must file US tax returns. Her Cash ISA interest is taxable as ordinary income. Her Stocks and Shares ISA funds are classified as PFICs, requiring annual Form 8621 filings. Her workplace pension may need to be reported as a foreign trust on Forms 3520 and 3520-A. She also needs to file FBARs and potentially Form 8938 for all of these accounts. We help Sarah navigate each of these requirements and develop a plan to restructure her investments over time.
James is a US citizen living in Illinois who inherited bank accounts and a portfolio of UK investment funds from a relative in England. The inheritance itself is not subject to US income tax (though it may require Form 3520 reporting if it exceeds $100,000), but the ongoing income from the inherited assets is fully taxable. The UK investment funds are PFICs, and James now faces annual Form 8621 filings for each fund he inherited. He also needs to begin reporting the accounts on his FBAR. We help James understand his new obligations, calculate any taxes due, and evaluate whether to retain or liquidate the inherited UK investments.
Priya holds both US and UK citizenship. She was born in the UK to an American parent and has lived in London her entire adult life. She recently learned about her US filing obligations and wants to come into compliance. She has a SIPP holding six different UK-domiciled OEICs, a Cash ISA, and several UK bank accounts. Her SIPP is likely a foreign grantor trust for US purposes, triggering Forms 3520 and 3520-A. Each OEIC inside the SIPP is a PFIC requiring Form 8621. She may qualify for the Streamlined Foreign Offshore Procedures to catch up on multiple years of unfiled returns without penalties.
David is a US citizen who spent eight years working in London. During that time, he participated in his employer's UK pension scheme, opened ISAs, and accumulated savings in several UK bank accounts. Now that he is returning to the United States, he needs to understand the ongoing US tax implications of his UK assets. His employer pension will continue to accrue benefits even though he has left the UK. His ISAs will continue generating income that must be reported on his US return. We help David develop a comprehensive repatriation strategy that addresses the tax treatment of each UK asset, coordinates with any UK tax filings that may still be required, and positions him for efficient long-term compliance.
If you have UK financial accounts that you have not been reporting on your US tax returns, FBARs, or FATCA forms, you are not alone. Thousands of UK expats and dual citizens discover their US filing obligations each year, often after being contacted by their UK bank or receiving IRS correspondence. The good news is that the IRS offers formal programs designed to help taxpayers come into compliance without facing the harshest penalties.
The Streamlined Filing Compliance Procedures allow qualifying taxpayers to file three years of amended or delinquent tax returns and six years of FBARs. Taxpayers who reside outside the United States may qualify for the Streamlined Foreign Offshore Procedures (SFOP), which carry a zero-penalty outcome. Taxpayers residing in the United States may use the Streamlined Domestic Offshore Procedures (SDOP), which require a 5 percent miscellaneous offshore penalty calculated on the highest aggregate value of unreported foreign assets.
To estimate your potential penalty exposure under the SDOP, try our SDOP Penalty Calculator.
We have guided dozens of UK expats and dual citizens through the streamlined process. Our approach includes a thorough review of your UK financial history, preparation of all required US tax returns and international information returns, and a detailed certification statement explaining your non-willful conduct. The certification is the most important part of a streamlined submission, and we draft each one with the care and specificity needed to withstand IRS review.
Whether you need help with current-year compliance, catching up on past filings, or restructuring your investments for tax efficiency, our team is ready to help.
Book Your Free ConsultationYes. The United States taxes its citizens and green card holders on worldwide income, regardless of where they live. If you are a US citizen or permanent resident living in the United Kingdom, you are required to file a US federal income tax return every year reporting all of your worldwide income, including salary earned in the UK, UK bank interest, UK investment income, and UK pension distributions. You may also need to file state tax returns depending on your last US state of residence. The US-UK tax treaty provides mechanisms to avoid double taxation through foreign tax credits, but it does not eliminate the filing requirement itself. Failure to file US returns while living abroad can result in penalties, loss of treaty benefits, and complications if you ever wish to return to the United States or renounce US citizenship.
Yes. Individual Savings Accounts (ISAs) are tax-exempt under UK law, but the United States does not recognize this exemption. All income earned inside an ISA, including interest on Cash ISAs and dividends and capital gains on Stocks and Shares ISAs, must be reported on your US federal income tax return. There is no provision in the US-UK Income Tax Treaty that extends ISA tax-exempt status to US taxpayers. Furthermore, Stocks and Shares ISAs often hold UK-domiciled funds that are classified as Passive Foreign Investment Companies (PFICs) under US law, which can trigger punitive tax treatment and require annual Form 8621 filings for each fund held.
The US tax treatment of UK pensions depends on the type of pension. UK State Pension payments are generally treated as social security benefits under the US-UK treaty and may be taxable only in your country of residence if the proper treaty election is filed using Form 8833. Workplace pensions and personal pensions are generally taxable as ordinary income when distributions are received. Self-Invested Personal Pensions (SIPPs) may be treated as foreign grantor trusts, requiring annual reporting on Forms 3520 and 3520-A. Contributions to UK pensions may or may not be deductible for US purposes depending on treaty elections and the specific terms of the pension arrangement. Proper planning and treaty analysis are essential to minimize double taxation on UK pension income.
A Passive Foreign Investment Company (PFIC) is any non-US corporation where 75 percent or more of gross income is passive income, or 50 percent or more of assets produce passive income. Virtually all UK-domiciled investment funds, including OEICs, unit trusts, investment trusts, and UK-domiciled ETFs, meet this definition. The PFIC tax regime is deliberately punitive, taxing gains at the highest ordinary income rate plus an interest charge for the deferral period. Each PFIC holding requires a separate Form 8621 filing. There are alternative elections (QEF and Mark-to-Market) that can reduce the tax impact, but each comes with its own requirements and limitations. Most cross-border tax professionals recommend that US persons avoid holding PFICs whenever possible and invest through US-domiciled funds instead.
If you are a US person and the aggregate value of all your foreign financial accounts exceeds $10,000 at any time during the year, you must file a Foreign Bank Account Report (FBAR) using FinCEN Form 114. This includes UK current accounts, savings accounts, ISAs, pension accounts, and investment accounts. Additionally, if your foreign financial assets exceed certain thresholds ($50,000 for US residents, $200,000 for those living abroad, with higher thresholds for joint filers), you must file Form 8938 under FATCA. Both filings are mandatory and carry severe penalties for noncompliance. UK banks also report US account holders' information directly to the IRS under automatic exchange agreements.
The saving clause, found in Article 1(4) of the US-UK Income Tax Treaty, preserves the right of each country to tax its own citizens and residents as if the treaty did not exist. In practical terms, this means that US citizens living in the UK cannot use the treaty to avoid US tax on their income. However, certain treaty provisions are specifically exempted from the saving clause, including those relating to pension contributions, social security benefits, and the mechanisms for eliminating double taxation. Understanding which treaty benefits survive the saving clause is essential for proper cross-border tax planning.
Yes. US citizens and residents can generally claim a foreign tax credit on their US return for income taxes paid to the United Kingdom. The credit is claimed on Form 1116 and is limited to the US tax attributable to foreign-source income. Because the UK and US categorize income differently and apply different rates, the foreign tax credit may not fully eliminate double taxation in every situation. Excess credits can be carried back one year or carried forward up to ten years. Proper categorization of income by source and type is essential to maximize your foreign tax credit and minimize your overall tax burden across both jurisdictions.
If you have not been filing US tax returns, FBARs, or FATCA forms to report your UK financial accounts, you may be eligible for the IRS Streamlined Filing Compliance Procedures. These procedures allow you to file three years of delinquent or amended tax returns and six years of FBARs. If you live outside the US, the Streamlined Foreign Offshore Procedures (SFOP) may allow you to come into compliance with no penalties. If you live in the US, the Streamlined Domestic Offshore Procedures (SDOP) require a 5 percent miscellaneous offshore penalty. Eligibility requires that your failure to report was non-willful, meaning it resulted from negligence, inadvertence, or a good-faith misunderstanding of the requirements. We strongly recommend addressing this as soon as possible, as the streamlined procedures are discretionary and could be modified or eliminated by the IRS at any time.
Not necessarily, but you should carefully evaluate each account. UK bank accounts can be maintained and reported on your FBAR and FATCA filings without significant tax complications, as long as the reporting is done properly. Cash ISAs generate taxable interest but are otherwise straightforward. Stocks and Shares ISAs and UK investment accounts holding PFICs are more problematic due to the ongoing compliance costs and punitive tax treatment. UK pensions generally should be retained and managed with proper treaty elections and reporting. We recommend a comprehensive review of all UK accounts to determine which are worth maintaining and which create unnecessary complexity or tax exposure.
The cost varies depending on the complexity of your situation. A straightforward return for a UK expat with a few bank accounts and a workplace pension will cost less than a return involving multiple ISAs, PFICs, SIPPs with trust reporting, and treaty elections. We provide transparent pricing and will give you a clear estimate after reviewing the details of your situation during an initial consultation. Visit our pricing page for general guidance, or book a free consultation to discuss your specific needs.
