Can I save tax by setting up a professional corporation in Ontario?

Many regulated professionals in Ontario — including lawyers, doctors, accountants, engineers, and others — can incorporate through their governing body's rules. A professional corporation can qualify as a CCPC and potentially access the small business deduction on active professional income, producing the same deferral benefit available to other incorporated businesses.

The deferral works the same way: income retained inside the corporation is taxed at the lower corporate rate rather than your top personal marginal rate. Over time this can meaningfully increase the capital you accumulate if you do not need all your earnings personally each year.

However, professional corporations come with restrictions. Your governing body may limit who can own shares, what activities the corporation can carry on, and whether family income-splitting is permitted. The federal rules around personal services businesses and specified investment business can also affect whether corporate income qualifies for the lower rate. A professional incorporation is not a cookie-cutter decision — you need advice from both your regulatory college and a tax professional before proceeding.