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.
LLC members are taxed on their personal tax returns. The LLC itself is not taxed. S-Corp shareholders are taxed on their personal tax returns. The company itself is not taxed. C-Corps are taxed both at the corporate level and again on shareholders' individual returns. Non-Profits are taxed on a corporate level but may also enjoy a host of tax-exempt benefits. Sole Proprietorships are taxed only on their owner's tax return.