BBUSINESS & CORPORATE TAX SERVICES – US & UK ADVISORS
As US & UK Tax Advisors, we help freelancers, small businesses, and international companies manage US corporate tax in the UK, HMRC compliance, Form 5471 filings, GILTI, and UK corporation tax returns. Our cross-border specialists simplify dual tax compliance so you can stay compliant and focus on growth.
Cross-Border Corporate Tax Services for UK & US Companies
As expert US UK Tax Advisors, we specialise in supporting businesses with operations across the Atlantic. From US corporate tax in the UK to HMRC compliance, our dual- qualified team ensures smooth, accurate reporting in both jurisdictions.
We provide expert guidance on Form 5471 compliance in London, GILTI and CFC reporting, UK corporation tax returns, and business structuring. Whether you are a freelancer, small business, or a UK company with US operations, our advisors deliver tailored solutions that keep you compliant.
Our goal is simple — to make dual tax compliance clear and efficient, helping you avoid double taxation and penalties while focusing on what matters most: growing your business.
Our Services
UK Tax Services for Americans in the UK – Expert HMRC Support
US Corporate & International Reporting
IRS filings for US citizens and businesses with foreign entities, including Forms 5471, 8858, and 8865, ensuring accurate and timely compliance to avoid costly penalties.
GILTI, CFC, and Foreign Shareholding Compliance
Guidance on Controlled Foreign Corporations (CFCs) and GILTI tax rules, aligning IRS requirements with HMRC obligations to prevent double taxation and ensure compliance.
UK Company Accounts & Corporation Tax Returns
UK company accounts and corporation tax returns, helping reduce liabilities and coordinating filings with US tax requirements for seamless cross-border compliance.
Structuring International Businesses (LLCs, LLPs, Ltd Companies)
We advise on the best structures for cross-border businesses, including LLCs, LLPs, and Ltd companies, ensuring tax efficiency and minimising risks under both IRS and HMRC rules.
Freelancer & Small Business Cross-Border Advisory
Our team supports freelancers and small businesses with dual reporting (US, UK), double taxation relief, and treaty planning—affordable, practical solutions for cross-border growth.
Cryptocurrency Tax Reporting (IRS & HMRC)
We help businesses and individuals report crypto gains, investments, and holdings correctly under both IRS and HMRC rules, ensuring compliance and avoiding penalties.
Why It’s Important to Have Specialist Corporate Tax Advisors
Managing business tax across the US and UK is highly complex, with different reporting rules, deadlines, and entity structures. A general accountant may not fully understand how IRS corporate tax rules interact with HMRC requirements, leaving businesses exposed to double taxation, missed filings, or costly penalties.
By choosing specialist US & UK corporate tax advisors, you gain the expertise needed to handle Form 5471 compliance, GILTI tax, CFC reporting, and UK corporation tax returns seamlessly. Our dual-qualified team ensures filings in both jurisdictions are aligned, accurate, and tax-efficient.
Every freelancer, small business, or international company faces unique challenges when trading across borders. Dedicated specialists provide the tailored advice and strategic planning required to protect profits, remain compliant, and support long- term growth.
Key Industry Insights:
19-25%
Combined effective corporate tax rates for US-UK businesses, varying significantly based on structure and planning.
Source: International Corporate Tax Report 2023
31%
Average tax savings achieved by multinational businesses through strategic corporate tax planning.
Source: Corporate Tax Optimization Study 2023
£500K+
Typical annual tax savings for mid-market businesses through proper US-UK tax structure optimization.
Source: Business Tax Planning Analysis 2023
Get in Touch
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.
US owners of UK companies face both HMRC and IRS obligations, including UK corporation tax, Form 5471 and GILTI. We structure entities, coordinate corporation tax with US reporting, and plan owner remuneration so cross-border businesses and freelancers stay compliant without paying tax twice on the same profits.
Key Takeaways
- US owners of foreign companies generally file Form 5471 with the IRS
- GILTI can tax a profitable UK company's earnings currently in the US
- Check-the-box elections change IRS treatment of your UK entity
- US LLCs held by UK residents can create double-tax mismatches if unmanaged
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 AssessmentBusiness & Corporate Tax — Frequently Asked Questions
I'm a US owner of a UK limited company — what do I have to report to the IRS?
A US person who owns or controls a foreign corporation, including a UK limited company, generally must file Form 5471 with their US return. Ownership can also expose you to the GILTI regime, taxing certain foreign company profits currently in the US. These filings are complex and carry steep penalties for omission, so early structuring advice is valuable.
What is GILTI and how does it affect US shareholders of a UK company?
GILTI (Global Intangible Low-Taxed Income) can tax US shareholders on a foreign company's profits in the year they arise, rather than when distributed. UK corporation tax already paid can reduce the impact, and elections may help, but without planning a profitable UK company can create an unexpected current US tax charge for its American owner.
How does UK corporation tax interact with a US owner's tax position?
The UK company pays UK corporation tax on its profits. For a US owner, those same profits may also be relevant for US purposes through GILTI, Subpart F or on distribution as dividends. Foreign tax credits and careful structuring coordinate the two systems so profits are not effectively taxed twice at unrelieved rates.
Should my UK company make a US check-the-box election?
A check-the-box election can change how the IRS treats your UK entity — as a corporation, partnership or disregarded entity — which affects GILTI, Form 5471 versus other filings, and how credits flow. The right choice depends on ownership, profit levels and your wider position. It is a decision to model carefully, as elections have lasting consequences.
Do freelancers with a US LLC face UK tax?
If you run a US LLC while UK resident, HMRC may treat the LLC differently from the IRS, which can create mismatches in how profits and credits are recognised. This is a well-known trap that can lead to double taxation if handled incorrectly. We review the entity's UK treatment and align it with your US filing to avoid unrelieved tax.
How are owner salaries and dividends taxed across the US and UK?
Remuneration taken as salary or dividends is taxed in the country where you are resident and, for US persons, also by the IRS on worldwide income. The mix of salary and dividends, plus the timing, affects both UK and US liabilities and the credits available. We plan extractions so both authorities are satisfied and total tax is minimised.
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.