Guides by topic
US-UK Tax: UK tax guides
Americans living in the UK and Brits living in the US should rarely pay full tax twice on the same income, because the US-UK tax treaty and foreign tax credits exist precisely to stop that. The 11 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 July 2026
Read the guideGuideAmericans Living in the UK: Tax Explained
Americans living in the UK tax guide: how the US and UK both tax you, dual filing, treaty relief, FBAR and FATCA reporting and the traps to avoid.
12 min read Reviewed June 2026
Read the guideGuideThe US-UK Tax Treaty Explained: How It Works for Individuals
How the US UK tax treaty works for individuals: the residence tie-breaker, the saving clause, pensions, dividends and claiming double tax relief in practice.
13 min read Reviewed June 2026
Read the guideGuideFBAR and FATCA Explained for UK-Based Americans
FBAR and FATCA explained for Americans in the UK: filing thresholds, deadlines, penalties, key differences and how to catch up safely if you are behind.
8 min read Reviewed June 2026
Read the guideGuideUK Tax on a US LLC: The Hybrid Entity Trap
US LLC UK tax explained: why HMRC treats an LLC as opaque while the US sees it as transparent, the Anson case, double tax risk and the 2026 reform plans.
9 min read Reviewed July 2026
Read the guideGuide401(k), IRA and Roth: UK Tax Treatment
401k UK tax rules explained: how the UK-US treaty taxes 401(k) and IRA withdrawals, lump sums, the Roth IRA position and what UK residents must report.
10 min read Reviewed July 2026
Read the guideGuideUS Exit Tax: Giving Up a Green Card or Citizenship
US exit tax explained for 2026: who counts as a covered expatriate, the deemed sale of your assets and what giving up a green card or citizenship costs.
8 min read Reviewed July 2026
Read the guideGuideSelling US Property as a UK Resident
Selling US property as a UK resident: how FIRPTA withholding, your US return and UK capital gains tax fit together, and how credit relief stops double tax.
8 min read Reviewed July 2026
Read the guideGuideThe PFIC and ISA Traps for Americans in the UK
An ISA is not tax-free for a US citizen, and most UK pooled funds are PFICs with punitive US tax treatment. This guide explains both traps, the mirror-image UK trap for US funds, and how the FIG window changes the picture for new arrivals.
9 min read Reviewed July 2026
Read the guideGuideThe US to UK Arrival Year: How Your First Tax Year Works
Move from the US to the UK mid-year and you sit inside two tax systems at once. This playbook walks through the SRT, the split-year cases for arrivers, claiming the FIG regime on the SA109, the US side in outline and the treaty tie-breaker for the overlap.
8 min read Reviewed July 2026
Read the guideGuideUK Pensions When You Move to the USA: The Full Picture
Most people moving to the USA simply keep their UK pensions: the treaty protects growth, taxes regular withdrawals only in the US and covers the State Pension too. The 25% tax-free lump sum and the April 2027 inheritance tax change are where the planning lives.
8 min read Reviewed July 2026
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