[jahewson]

Switzerland has a tax treaty with the US which avoids double-taxation.

https://sigtax.com/en/switzerland-united-states-tax-treaty

[tonfa]

Yes, most countries do so you're not double taxed. But you still need to declare, and esp. for Switzerland likely pay extra taxes to the US.

[tim333]

The UK has a tax treaty with the US but it didn't stop one Boris Johnson being hit with many thousands in US taxes when he sold his house in spite of having lived in the UK most of his life.

[MeinBlutIstBlau]

Was his house in the US or UK? If it was in the US the it doesn't matter, the local government is gonna get theirs.

[tim333]

In the UK. The UK has no cgt on your main residence when you sell but the US does.