Notes from the overlap between two tax systems.
Plain-English writing on the filings, thresholds and reliefs that come up most, and the assumptions that quietly cost people the most money.
US tax
Filing a US return from the UK: what actually changes
The obligation does not go away when you move. What changes is which reliefs you claim and in what order.
Catch-up
Streamlined filing: getting current, penalty-free from abroad
The route back for people who did not know they had to file. Narrower than it looks, and worth assessing before you submit anything.
Investments
Your ISA is tax-free in the UK. The IRS disagrees.
The wrapper does not travel. Worse, most of what sits inside one is a PFIC, and PFIC treatment is punishing by default.
Pensions
UK pensions under US rules: where the treaty helps and where it does not
A UK pension is usually fine to hold. The tax-free lump sum is where assumptions get expensive.
Property
Selling a UK home when the IRS is also watching
Private Residence Relief covers the UK side. The US calculates a different gain, in a different currency, with a smaller exclusion.