This guide outlines important tax considerations for individuals transitioning from employee to business owner. It begins by discussing the various business structures available, including sole proprietorships, corporations, and partnerships, and how each structure affects taxation. The Canada Revenue Agency's definition of a business is provided, along with details on calculating net business income or loss, which includes allowable deductions for expenses. The guide explains the implications of operating as a sole proprietor, including personal liability and tax reporting on personal returns. It also covers the characteristics of corporations, including tax rates and the concept of deferring personal taxes through dividends. Additionally, the guide emphasizes the importance of separating business and personal expenses to facilitate accurate tax reporting. The conclusion highlights the complexity of business taxation and advises consulting with tax and legal professionals for tailored guidance.