@ remsta, while the article quoted is correct but the situation is different --- the general case is a Non-Resident Alien investing is stocks/bonds/capital asset while being a Non-resident ( and generally implying the source of the investment is foreign and therefore the person's US connection is tenuous. In such cases mostly the country of citizenship is going tax the gain under its laws.
In your case you invested while a US resident and therefore there is closer connection. One can assert treaty benefits ( I need the country of citizenship ) if and only if one can show "closer connection " to another country or home country. Also note that , even if you submitted the final paperwork , leaving the USA, the date when this is recognized may be much later than the actual submission date. So could you please provide your exact dates and situation when exiting this country -- i.e. what forms were filed when -- please
pk
