The United States is one of only two countries that taxes its citizens on worldwide income no matter where they live. Add the UK's own rules on residence, domicile and remittance, and an ordinary life — a job, a house, a pension, some savings — produces filing obligations in two jurisdictions that rarely line up neatly.
Most people end up with a UK accountant who does not touch US forms and a US preparer who has never seen an SA100. The gap between them is where penalties, double taxation and missed elections live. We closed that gap by doing both.
Alongside the compliance work, our ITIN team handles Form W-7 applications — the single biggest source of delay for non-US clients — from eligibility check through to the IRS notice, and we always tell you which identity-verification route keeps your original passport in your own hands.