Form W8-BEN: You must give Form W-8BEN to the withholding agent or payer if you are a non-resident foreign individual who is the beneficial owner of an amount subject to withholding or if you are an account holder of the FFI documenting yourself as a non-resident foreign individual. If you are the single owner of a disregarded entity, you are considered the beneficial owner of income received by the disregarded entity. Submit Form W-8BEN when requested by the withholding agent, payer, or FFI whether or not you are claiming a reduced rate of, or exemption from, withholding. See the W8-BEN Instructions.
Form W8-BEN-E: Foreign corporations, partnerships, trusts or a beneficial owner solely claiming foreign status or treaty benefits.
Form W8-ECI: A foreign individual or entity claiming that income is effectively connected with the conduct of trade or business within the U.S. (unless claiming treaty benefits). If you are a foreign person & you are the beneficial owner of U.S source income that is (or is deemed to be) effectively connected with the conduct of a trade or business within the U.S. W8-ECI Instructions