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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?
Found a great article (with bibliography) that covers taxation on investment activity by non resident aliens - even covers the special 15% tax on dividends for Canadian residents. It's (dividend tax rate) generally 30% for other NRAs  (your 2nd question). And it confirmed my suspicion that there are no capital gains taxes for NRAs. (1st Q) Source: http://invest-faq.com/articles/tax-non-us-nat.html