US UK Tax Mistakes Expats 2026: Top Errors and Fixes
META DESCRIPTION: Discover the top US and UK tax mistakes expats make in 2026 and learn expert strategies to fix them, ensuring compliance and maximising tax efficiency. TAGS: US UK tax mistakes expats 2026, US expat tax UK, UK expat tax US, Form 1040 foreign income, IRS expat compliance, HMRC US tax, US-UK tax planning, foreign tax credit, expat tax errors, UK-US tax advisory, FATCA compliance, CRS reporting Navigating the tax obligations between the United States and the United Kingdom is a complex challenge for expats. Many make critical errors that can lead to fines, penalties, and unnecessary tax liabilities. Understanding the most common US-UK tax mistakes expats make in 2026 is essential for anyone holding assets, earning income, or investing across borders. Mistakes are costly, and with new regulations and reporting requirements coming into effect in 2026, the stakes are higher than ever. The IRS and HMRC actively exchange financial information, increasing the risk of ...