In Ontario, rental income earned in a corporation is considered passive income and is taxed at a 50% rate, but 30% is refundable when a taxable dividend is issued to the shareholder.
A corporation is a separate legal entity that can act as a shield for your personal assets, such as your primary residence, if a tenant sues. However, you will typically still need to provide personal guarantees for mortgages.
DIY online corporations may not meet the specific requirements of bankers, which can lead to financing disasters or the need to pay extra costs to fix the structure later.