Almost all countries tax foreign income of residents. In your example you would be taxed on gains beyond the initial amount in all countries that aren't conside

Almost all countries tax foreign income of residents. In your example you would be taxed on gains beyond the initial amount in all countries that aren't considered to be tax havens. (The non-domiciled rule in the UK being one notable exception) https://en.wikipedia.org/wiki/International_taxation https://en.wikipedia.org/wiki/International_taxation