US & UK Tax Specialists for High-Net-Worth Individuals
As specialist US UK tax accountants, we deliver tailored tax and wealth solutions for high-net-worth individuals, families, and non-doms with assets in the US, UK, and beyond. From trust and estate planning to expatriation advice and global investment structuring, our dual-qualified experts simplify complex cross- border rules, protect your wealth, and ensure full compliance with both IRS and HMRC.
Smart Global Tax Solutions for High-Net-Worth Clients
At US UK Tax Advisors, we deliver bespoke tax and wealth solutions for high-net-worth individuals, thriving families, and international clients with US and UK connections. Managing wealth across two jurisdictions requires more than basic compliance—it demands a strategic approach that accounts for complex tax rules, multi-jurisdiction assets, and long-term wealth preservation.
Our services cover every aspect of high-value cross-border tax planning, from trust and estate structuring to cross-border investment reporting, non-domicile tax UK strategies, and expatriation planning. We take on the complexity so you can focus on your family, your business, and your lifestyle.
We understand that wealth management is never one-size-fits- all. That’ s why we adapt our approach to your unique story, whether that means restructuring global investments, coordinating IRS and HMRC filings, or preparing for a move between the US and the UK. With us, you gain trusted partners who simplify compliance while safeguarding your wealth.
We advise high-net-worth individuals with US and UK ties on structuring wealth efficiently across both tax systems. Our work spans foreign account and asset reporting, PFIC and property taxation, residence and domicile planning, and cross-border estate strategies that preserve wealth for the next generation.
Key Takeaways
- US persons are taxed on worldwide income and gains, so investments and property need coordinated planning
- FBAR, FATCA Form 8938 and foreign trust/entity reporting commonly apply at higher wealth levels
- Non-US funds and ISAs can be PFICs with punitive US tax unless properly structured
- The US-UK estate tax treaty helps relieve double inheritance and estate tax charges
US–UK Cross-Border Tax: Key Facts
$10,000
Aggregate in foreign accounts at any point in the year triggers a mandatory FBAR (FinCEN Form 114) for US persons.
Source: IRS — FBARWorldwide
US citizens and Green Card holders must file a US return on worldwide income every year, regardless of where they live.
Source: IRS — Citizens Abroad$120,000+
The Foreign Earned Income Exclusion lets qualifying Americans abroad exclude over $120,000 of earned income (indexed annually).
Source: IRS — FEIE31 January
UK Self Assessment online returns and any tax owed are due by 31 January following the 5 April tax year end.
Source: GOV.UK — Self AssessmentOur Expertise at a Glance
Every high-net-worth client' s journey is unique, and so are their financial priorities. That' s why we offer more than generic advice—we become a strategic partner invested in your long-term success
- Extension of Your Finance Team – We manage the day-to-day tax reporting, IRS and HMRC filings, and compliance tasks so you don't have to.
- Strategic Advisor – We guide family offices, trusts, and global investments, ensuring your wealth is structured for growth and protection across borders.
- Controller When Needed – For clients who want a hands-on partner, we take on the role of financial controller, overseeing every detail of your tax and financial obligations
Our particular expertise includes non-domicile tax UK planning, expatriation and renunciation advisory (Form 8854), and trust and estate taxation under both US and UK rules. This allows us to deliver bespoke strategies for clients with significant global wealth, protecting assets, reducing liabilities, and ensuring compliance with both IRS and HMRC regulations.
Trusted Tax Advisors for High-Net- Worth People with Global Assets
Our clients are families and individuals with significant UK and global assets—businesses, properties, portfolios, and trusts spread across multiple jurisdictions. For them, managing tax obligations in two systems is more than just paperwork—it’ s about protecting wealth for today and future generations. As specialist accountants for high-net- worth people, we provide the expertise and foresight needed to manage complex cross-border finances.
We handle the compliance grind with both the IRS and HMRC, preparing everything from Form 1040s and SA100s to Form 3520s and 706 estate returns. But we don ’t stop at filings—we go further, providing tailored tax strategies that reduce liabilities, maximise treaty reliefs, and protect your wealth from unnecessary double taxation.
Whether you ’ re a UK family moving overseas, a non-domicile resident planning for tax efficiency, or an international client relocating to London, our dual-qualified advisors ensure your global tax position is aligned, efficient, and secure.
High Net Worth — US-UK Tax FAQs
How are US-connected high-net-worth individuals taxed on worldwide wealth?
US citizens and Green Card holders are taxed by the IRS on worldwide income and gains no matter where they live, while UK residents are taxed by HMRC on their UK and, depending on status, foreign income. For dual filers we coordinate both systems, using treaty relief and foreign tax credits to avoid double taxation on investments, property and business interests.
What foreign account and asset reporting applies to wealthy US persons abroad?
Beyond the FBAR for foreign accounts exceeding $10,000 in aggregate, wealthier US persons often trigger FATCA Form 8938 for specified foreign assets above higher thresholds, plus reporting for foreign trusts, corporations and partnerships. Accurate, coordinated reporting is essential because penalties for omitted forms are severe and apply per form, per year.
Are non-US pooled funds and ISAs a tax problem for US investors?
Often yes. Most non-US mutual funds, ETFs and investment trusts are treated as PFICs for US tax, triggering punitive taxation and Form 8621 reporting unless properly elected. UK ISAs lose their tax-free status for US purposes. We review portfolios to identify PFIC exposure and restructure holdings toward US-compliant, tax-efficient investments.
How does UK residence affect a high-net-worth individual's tax exposure?
UK tax exposure depends on your residence and domicile position, which determines how your foreign income and gains are taxed. Following recent reforms to the remittance basis and the move toward a residence-based regime, planning around arrival, departure and long-term UK residence is increasingly important. We model your position before major moves or asset sales.
How is real estate on both sides of the Atlantic taxed?
US and UK property each carry their own income, gains and transfer taxes, and the ownership structure affects both. US persons face IRS reporting on UK property income and gains, while UK situs assets can attract UK inheritance tax. We advise on ownership structures, financing and timing to reduce combined exposure and avoid unexpected double taxation.
Can you help with estate and inheritance tax across the US and UK?
Yes. The US imposes estate and gift tax on worldwide assets of citizens and domiciliaries, while the UK charges inheritance tax based on domicile and UK situs assets. The US-UK estate tax treaty helps allocate rights and relieve double charges. We plan gifting, trusts and structures to preserve wealth across generations in both jurisdictions.
Written & reviewed by the US-UK Tax Advisors cross-border tax team — chartered specialists in US and UK taxation, IRS and HMRC compliance, FATCA/FBAR reporting and double-taxation treaty planning.
Last reviewed: July 2026. This page is for general information and is not personal tax advice.
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Managing cross-border taxes doesn't have to be complicated. Whether you're a US citizen living in the UK, a UK resident with US tax obligations, or a business operating internationally, our team of specialist US UK tax accountants in London is here to help.