For all the people from HN dreaming of American immigration, be aware that 'US citizens' in this article (any anything else pertaining to taxation) should generally be read as 'US citizens and permanent residents'.
Also be aware that while renouncing permanent residency is much simpler (and you'll be sure to lose it if you're out of the country long enough), you may be exposed to significant tax liabilities for doing so - especially if you're holding illiquid startup stock.
Also be aware that while renouncing permanent residency is much simpler (and you'll be sure to lose it if you're out of the country long enough), you may be exposed to significant tax liabilities for doing so - especially if you're holding illiquid startup stock.