A professional corporation does not lower the tax on the income you spend. What it changes is the income you leave invested: that money is taxed at the small business rate until it comes out, instead of at your personal rate today. This tool takes one year of net professional income two ways, as a sole proprietor and through a corporation, delivers the same take-home on both, and shows what each leaves to invest, what remains once the corporation's share is paid out and taxed, and how CPP and RRSP room differ.
This tool is for illustration purposes only and does not constitute financial or tax advice. It models a single year on 2026 rates and projects nothing: no investment return, passive income tax, practice growth, or change in spending. Whether to incorporate also depends on matters the tool cannot assess, including your regulator's requirements for a professional corporation, lender and insurer requirements, family circumstances, and how long you expect to practise. Review the decision with your accountant and lawyer before acting.