IRS Filing Checklist for UK Residents
Filing your US taxes while living in the UK requires meticulous record-keeping. You will need your UK P60 (End of Year Certificate) or P45, along with statements for any UK interest, dividends, and capital gains. It is vital to use the correct exchange rates as mandated by the IRS. Compliance involves more than just income reporting; you must also satisfy the Foreign Account Tax Compliance Act (FATCA) requirements. Use the FinCEN BSA E-Filing System to submit your FBAR if your total foreign balances exceeded $10,000.
Deadlines to Remember
US expats are granted an automatic two-month extension to June 15th to file their return, but any tax due must be paid by April 15th to avoid interest charges.
Avoiding Common UK-US Compliance Errors
One of the most frequent mistakes for US expats is failing to report UK 'employer contributions' to a pension as income on the US return, though the treaty may allow for a deferral. In 2026, the IRS is utilizing AI to cross-match UK bank data (FATCA) with individual tax returns. The penalty for a 'non-willful' failure to file an FBAR is: $$Penalty \\approx \\$10,000 \\times (Inflation\\ Adjustment)$$. For 2026, this amount has been adjusted significantly upward.
Key Compliance Documents
Beyond the P60, ensure you have your 'Self Assessment' tax calculation from HMRC. LSI keywords include 'Statement of Foreign Financial Assets,' 'Electronic Filing (e-file),' 'Extension Form 4868,' 'Tax Preparer,' and 'Streamlined Filing.' If you have a UK 'Limited Company,' you must file Form 5471, which is notoriously complex and time-consuming. Refer to HMRC's official site for UK tax year summaries. For US-side help, the IRS Interactive Tax Assistant can help determine your filing status. Always maintain a digital copy of your 'Certificate of Tax Residence' from the UK to prove your status to the IRS if audited. Proper tracking of your 'foreign tax carryovers' is also essential for maximizing future credits.