Tax Neutrality Between Self-Employed and Corporate Income: An Overview 

In the Canadian tax landscape, the concept of “Integration” plays a pivotal role. The essence of this concept is that the Canadian tax system, in its ideal form, ensures that the total tax burden on personal and corporate income, whether derived from salary or dividends, remains consistent for the individual taxpayer. 

This principle of Integration significantly influences decisions related to: 

• Salary-type distributions: This approach shifts taxable income from the corporate level to the individual level. 

• Taxable dividends: Here, the taxable income remains within the corporation, leading to a secondary layer of taxation at the individual level. This is subject to the gross-up and credit treatment applicable to dividends from taxable Canadian corporations. 

To provide a clearer picture, consider a professional earning of $10,000 for an individual in Ontario’s highest tax brackets. The comparison between an unincorporated (self-employed physician) and an incorporated physician is as follows: 

• For an Individual: 

• Earning: $10,000 
• Tax payable at 53.53%: -$5,353 
• Net amount: $4,647 

• For a Corporation  

• (with Small Business Deduction for Annual Corporate Profits < $500,000): 
• Earning: $10,000 
• Corporate Tax at 12.20%: -$1,220 

• Available for distribution: $8,780 
• Tax payable by individual at 47.74%: -$4,192 
• Net amount to the individual: $4,588 

• For a Corporation  

• (without Small Business Deduction for Annual Corporate Profits > $500,000): 
• Earning: $10,000 
• Corporate Tax at 26.5%: -$2,650 
• Available for distribution: $7,350 
• Tax payable by individual at 39.34%: -$2,891 
• Net amount to the individual: $4,459 

From the above, it’s evident that there’s a minor initial cost when earning through a professional corporation compared to direct earnings (0.59% for income eligible for small business deduction). However, a significant tax deferral advantage exists for income retained within the corporation, primarily because corporate tax rates are substantially lower than personal tax rates. This deferred tax becomes payable only when distributed to shareholders. 

For instance, if a physician retains $100,000 within the corporation for investments after accounting for personal expenses, a tax deferral of $41,330 is achieved ($27,030 when the small business deduction isn’t applicable). The real advantage emerges when these tax-deferred earnings accumulate over several years within a professional corporation’s passive investment portfolio. 

In conclusion, if your unincorporated practice generates more income than your personal living expenses and you can save around $100,000 annually within the corporation, incorporation becomes a viable option. It also offers flexibility in terms of when and how you distribute corporate earnings, potentially allowing for distributions at reduced marginal tax rates upon retirement.