You also will need to file certain forms to fulfill your federal and state income tax obligations. The forms you need are determined by your business structure. A complete list of the forms each type of entity will need can be found on the SBA website. You can also find state-specific tax obligations there. Some businesses may also require federal or state licenses and permits to operate. You can use the SBA's database to search for licensing requirements by state and business type.
Unlike in many other Western countries, Canadian businesses generally only have one form of incorporation available. Unlimited liability corporations can be formed in Alberta "AULC", British Columbia "BCULC" and Nova Scotia "NSULC". The aforementioned unlimited liability corporations are generally not used as operating business structures, but are instead used to create favorable tax positions for either Americans investing in Canada or vice versa. For U.S. tax purposes the ULC is classified as a disregarded entity.