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Are there capital gains taxes or dividend taxes if I invest in the U.S. stock market from outside of the country?
I believe that tax will be withheld (at 30%?) on dividends paid to non-residents.  You can claim it back if your country has a tax treaty with the USA, but you will need to file.  You probably also need to file a W-series withholding form (eg a W9-BEN). Interesting question.  I would like to hear a more definitive answer.