Limited liability companies must pay state fees during the incorporation process. These fees can be deducted from taxes. S-Corps must pay state fees to legally incorporate. These fees can be deducted from taxes. C-Corps must pay state fees to become legally recognized. These fees can be deducted from taxes. Non-Profits pay state fees when they incorporate. These fees can be deducted from taxes. Since Sole Proprietorships aren't incorporated entities, they don't pay formation or compliance fees.
Since limited liability companies can be a pass-through entity, owners are taxed on their personal income. S-Corp shareholders are taxed personally. The S-Corp, however, is not. C-Corp income is taxed at the corporate level first, then again at the personal level. This is called "double taxation." Non-Profits are only taxed once and can write off most of their expenses. Sole Proprietors are taxed only on their personal tax return.
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.