Specifically wondering about Amex but curious about everybody else. Under certain conditions an LLC does not need to have an EIN and can use the owner's Social Security number for tax purposes and in fact the LLC owner can file a consolidated tax return. I'm curious if an LLC without an EIN can get a business card. On the Amex website it says: "For Partnerships and Corporations, Federal Tax ID (EIN) is required to activate an American Express business account." Would the Social Security number work if there is no EIN?