1) Having your own company is more risky as opposed to a Permanent employee role in the government's eyes, hence more opportunities to pay less taxes
2) Companies are far more likely to work towards creating employment than individuals working for companies, benefiting the economy
3) Dividend income is taxed at a reduced bracket to stimulate investment, regardless whether you're investing in your own company or getting dividends from a large public corporation by being a shareholder
10 years of filing corporate taxes, having every accountant follow this practice, and an official audit with no complaints shows the Canadian Revenue Agency has no issues with this system.