Here are some useful resources

The Canada Revenue Agency (CRA) administers tax laws for the Government of Canada and for most provinces and territories, and administers various social and economic benefit and incentive programs delivered through the tax system.

Service Canada provides Canadians with a single point of access to a wide range of government services and benefits. They are committed to improving services for Canadians by working with partners to provide access to the full range of government. 

Administrative information for Alberta corporate and commodity taxes and levies, exemptions, health cost recovery and GST-free entities.