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If you are a sole proprietor, the business is filed as part of your T1 personal tax return using for example form T2125. For a corporation, a T2 return must be filed every year. A corporation is a separate entity from shareholders and must therefore file it's own tax return. So a T1 for personal income and a T2 for a corporate return. TurboTax has products for both these filings.

Hope this helps