In Ontario, I registered the business name(not my name) just to ensure that I held the name that I wanted. That gives you a Business Identification Number for about $60 for 5 years(in Ontario) At tax time, I don't put my SIN on tax receipts, I only print out the BIN, which the accountant and CRA can cross-reference to link to my business, and I don't have to worry about giving out my personal information.