Why one cross-border firm beats two good accountants
Your US accountant is excellent at US tax. Your UK accountant is excellent at UK tax. The expensive mistakes happen in the space between them — because that space belongs to nobody.
Five failures of the two-adviser model
The credit claimed in the wrong country
Foreign tax credit planning depends on which country taxed first, at what rate, in which year. Two advisers each assume the other has it covered; the taxpayer funds the difference.
The ISA nobody mentioned
A UK adviser sees a sensible tax-free wrapper. The IRS sees taxable income and, often, PFICs with punitive rates and heavy reporting. By the time it surfaces, there are years to unpick.
The election that helped one return and hurt the other
Choosing the Foreign Earned Income Exclusion, or a particular treatment of pension contributions, changes outcomes on the other filing — this year and for years after.
The pension drawn in the wrong shape
Periodic payment or lump sum, before or after a move: the treaty treats each differently. The wrong sequencing turns protected retirement savings into taxable ones.
The move planned around one system
Leaving the US or the UK triggers residence rules on both sides at once. A plan that optimises one side often walks straight into the other's rules.
What “one firm, both returns” changes
When the same practice prepares your US return and your UK Self Assessment, coordination stops being a hope and becomes a property of the process. The person deciding how to claim a foreign tax credit can see both returns and both payment dates. The person advising on a pension withdrawal knows how it lands in both systems before it happens. Elections are made once, with their full consequences in view.
It also changes the experience. You explain your situation once. You get one set of deadlines, one checklist, one fixed fee — and answers that never end with “you’d have to ask your other accountant about that.”
Talk to a US–UK tax specialist
Tell us about your situation and we’ll explain your position across both systems — what you need to file, what you can plan around, and what it will cost.
Or call +44 20 8064 3580 — we’ll tell you honestly whether you need help.