Lets say a non-resident alien files his W8-Ben (with no tax treaty provisions). According to the IRS, capital gains are tax free in the US as well as "interest-related dividends or short-term capital gain dividends". I have tested the latter by owning an ETF that made a capital gain distribution and there was no 30% withholding. Has anyone tested the former? ETFs such as IEF, TLT, SHY probably qualify as 'interest-related dividends' so in theory these distributions are tax free. I could test it myself but I don't want to wait months for the answer