Next Tax Source ✦ Specialisms ✦ US & UK
US–UK Cross-Border · Individuals

US & UK Expat Tax Accountant

One firm for both sides of your tax life. We prepare your US federal return and your UK Self Assessment together, apply the treaty so you are not taxed twice, and a licensed professional signs every filing.

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If you are American and live in Britain — or you are a dual US/UK citizen, or a Brit with US income — you sit inside two tax systems at once. The United States taxes its citizens on worldwide income wherever they live; the United Kingdom taxes you as a resident. Handled separately by two firms, the two returns fight each other. Handled together, the treaty and the foreign tax credit make sure the same income is not taxed twice. That is the whole point of a single US–UK adviser.

Behind on past years? Start with our guide to the IRS Streamlined Foreign Offshore Procedure, or read what happens with missed US tax returns from abroad. We bring you current first, then keep you current.

What We Handle

Who This Is For

The people we most often act for are living an ordinary life in Britain and only want their tax done correctly on both sides:

How The US And UK Systems Fit Together

The US taxes on citizenship, the UK on residence, and the US–UK tax treaty and foreign tax credit exist to stop that overlap becoming double taxation. In practice most of our clients pay UK tax first and then credit it against any US liability, so the extra US tax is frequently small or nil — but the return still has to be filed, correctly, every year.

The two systems do not line up neatly. The US runs on a calendar year and the UK on 6 April to 5 April, so income has to be apportioned between them. UK ISAs and many UK pensions get favourable UK treatment but are not automatically recognised by the US, which is where careful treaty and PFIC analysis earns its keep. The exclusion amounts, credit rules and reporting thresholds are set each year and can change; we confirm the current figures against IRS, HMRC and FinCEN guidance before anything is prepared, and never assume last year's number still holds.

How Next Tax Source Handles It

Our specialist AI agents prepare both returns and all supporting forms to a ready-to-sign standard with full workpapers. A licensed US CPA or Enrolled Agent signs the US side and a UK chartered accountant signs the UK side. You sign and submit your own returns; we never file to the IRS or HMRC on your behalf. One relationship, both countries, every figure checked.

Planning a company as well as a personal move? See our US–UK cross-border business tax service, or model the numbers with the US vs UK vs UAE calculator.

Questions People Ask

Do I really have to file US taxes if I live in the UK?
Yes. The US taxes its citizens and green-card holders on worldwide income regardless of where they live, so the filing obligation follows you to Britain. Filing and owing are different, though — with the Foreign Earned Income Exclusion and Foreign Tax Credit, most Americans in the UK owe the US little or nothing once their UK tax is credited. The return still has to be filed each year.
Will I be taxed twice by the US and the UK?
Usually not. The US–UK tax treaty and the foreign tax credit are designed to stop the same income being taxed by both countries. In most cases you pay UK tax first and credit it against any US liability. Getting the ordering and the treaty positions right is exactly what a single cross-border adviser is for.
Do you handle both my US return and my UK Self Assessment?
Yes — that is the point of the service. We prepare the US federal return and the UK Self Assessment together and reconcile them, so the two filings support rather than contradict each other. A US CPA or Enrolled Agent signs the US side and a UK chartered accountant signs the UK side.
Are my ISA and UK pension a problem for US tax?
They can be. ISAs and some UK pension and investment structures are tax-advantaged in the UK but are not automatically recognised the same way by the US, and many UK funds are treated as PFICs, which carry punitive US treatment if left unanalysed. We identify and handle these as part of preparing your return rather than letting them surprise you.
I am several years behind — can you still help?
Yes. Most people who come to us behind on US filings qualify for the IRS Streamlined Foreign Offshore Procedure, which brings you current — typically with no penalties where the failure to file was non-willful. We assess eligibility honestly, get you compliant, then keep you current going forward.
Who prepares and who signs my returns?
Our specialist AI agents prepare the full package to a ready-to-sign standard with complete workpapers. A licensed US CPA or Enrolled Agent reviews and signs the US return, and a UK chartered accountant signs the UK return. You, as the taxpayer, sign and submit your own returns; we never file on your behalf.

Every Filing, Signed By A Professional

We prepare it all to a ready-to-sign standard; a US CPA or Enrolled Agent and a UK chartered accountant review and sign before anything is filed. Tell us your situation and we'll return a scoped proposal within one business day.

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