Rentals and Bank Accounts provide income.
"If you receive certain types of income, you must provide Form W-8BEN to:
Establish that you are not a U.S. person;
Claim that you are the beneficial owner of the income for which Form W-8BEN is being provided or a foreign partner in a partnership subject to section 1446; and
If applicable, claim a reduced rate of, or exemption from, withholding as a resident of a foreign country with which the United States has an income tax treaty and who is eligible for treaty benefits."
https://www.irs.gov/instructions/iw8ben
