Guides by topic
US-UK Tax: UK tax guides
If you are an American living in the UK or a Brit living in the US, you are inside both countries' tax nets at once, and getting the interaction right in the 2026/27 tax year is what keeps your total bill fair rather than doubled. The 8 guides in this section cover US-UK Tax Guide, Americans Living in the UK, The US-UK Tax Treaty Explained, and more. Each guide is written and kept current by Jordan Onraet-Wells, a Chartered Tax Adviser.
US-UK Tax Guide: Americans in the UK & Brits in the US
Americans in the UK and Brits in the US sit inside two tax nets at once. Getting the interaction right is what keeps the total bill fair rather than doubled.
12 min read Reviewed June 2026
Read the guideGuideAmericans Living in the UK: Tax Explained
How US citizens and green-card holders living in the UK are taxed by both countries, and how to avoid double tax: dual filing, the treaty, FBAR, FATCA, FIG and the big traps.
12 min read Reviewed June 2026
Read the guideGuideThe US-UK Tax Treaty Explained: How It Works for Individuals
How the US-UK double tax treaty works for individuals: the residence tie-breaker, the saving clause, pensions and US Social Security, dividends, interest and Form W-8BEN, explained by a UK Chartered Tax Adviser practice.
13 min read Reviewed June 2026
Read the guideGuideFBAR and FATCA Explained for UK-Based Americans
A plain-English guide to FBAR (FinCEN Form 114) and FATCA (Form 8938) for US persons in the UK: thresholds, deadlines, penalties, the difference, and how to catch up.
8 min read Reviewed June 2026
Read the guideGuideUK Tax on a US LLC: The Hybrid Entity Trap
How a UK resident is taxed on a US LLC, the transparent-versus-opaque hybrid mismatch, the Anson case, HMRC's December 2024 practice and the live 2026 reform.
9 min read Reviewed July 2026
Read the guideGuide401(k), IRA and Roth: UK Tax Treatment
How 401(k)s, traditional IRAs and Roth IRAs are taxed in the UK under the UK-US treaty: periodic payments, lump sums, the 2025 HMRC change, the Roth question and reporting.
8 min read Reviewed July 2026
Read the guideGuideUS Exit Tax: Giving Up a Green Card or Citizenship
A 2026 guide to the US exit tax under section 877A for Brits giving up a green card or US citizenship: covered-expatriate tests, the mark-to-market deemed sale, and pensions.
8 min read Reviewed July 2026
Read the guideGuideSelling US Property as a UK Resident
A UK resident selling US real estate is taxed in both countries: US FIRPTA withholding plus a US return, and UK CGT on the same gain, with credit relief to avoid double tax.
8 min read Reviewed July 2026
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