Example: You are a nonresident alien and are not engaged in a U.S. trade or business. You own a single-family house in the United States that you rent out. Your rental income for the year is $10,000. This is your only U.S. source income. As discussed earlier under The 30% Tax, the rental income is subject to a tax at a 30% (or lower treaty) rate. You received a Form 1042-S showing that your tenants properly withheld this tax from the rental income. You do not have to file a U.S. tax return (Form 1040NR) because your U.S. tax liability is satisfied by the withholding of tax.