If there is a tax treaty with the U.S. and your home country and there is only effectively connective income, but not a permanent establishment you will not pay U.S. taxes. It is recommended to file a protective U.S. tax return along with the IRS form 8833 for the treaty-based return position disclosure. A single-member LLC would file form 5472 and if owned by a foreign entity it would file the protect return and 8833.