The most common and the simplest form of business is the sole proprietorship. In a sole proprietorship, a single individual engages in a business activity without necessity of formal organization. If the business is conducted under an assumed name (a name other than the surname of the individual), then an assumed name certificate (commonly referred to as a DBA) should be filed with the office of the county clerk in the county where a business premise is maintained. If no business premise is maintained, then an assumed name certificate should be filed in all counties where business is conducted under the assumed name.
No formation documents are required.