Incorporation Tax Calculator

Incorporation vs Sole Proprietorship Tax in Canada

Canadian-controlled private corporations (CCPCs) benefit from the Small Business Deduction (SBD), which reduces the federal corporate tax rate to 9% on the first $500,000 of active business income. Combined with provincial rates, the total small business rate ranges from 9% in Manitoba and Yukon to 12.5% in Ontario and 12.2% in British Columbia. This is dramatically lower than the top personal marginal rates, which exceed 50% in most provinces. The tax advantage lies in deferral: income left inside the corporation is taxed at the low corporate rate, and the remaining funds can be reinvested in the business.

However, integration means that when corporate profits are eventually paid out as dividends, additional tax is owed at the personal level. The Canadian tax system is designed so that the combined corporate-plus-dividend tax burden roughly equals what would have been paid had the income been earned personally. The real advantage of incorporation is deferral—if you do not need all the business income for personal living expenses, the retained earnings grow at the lower corporate rate. Incorporation also offers liability protection, income splitting opportunities (subject to TOSI rules), and access to the lifetime capital gains exemption on qualifying shares.

Combined Small Business Tax Rates by Province (2026)

Incorporation is most beneficial when annual business income exceeds personal spending needs by a significant margin—typically $80,000 or more in retained earnings. Below that threshold, the administrative costs (annual corporate filing, separate bank accounts, bookkeeping, and legal fees) may outweigh the deferral benefit. Consult a Canadian tax professional to model your specific situation, especially regarding the Tax on Split Income (TOSI) rules that limit income splitting with family members.