It's important to note that the company's exist in a Virtual World. What is meant by this is that although the Accounting Concepts that are explored are real, the consumption taxes, source deductions, employer contributions and income taxes do not adhere to a specific province's or country's structure.
These aspects of a company can change dramatically depending on the location, which is why they are used in a generic way for the purpose of understanding them, instead of forcing the user into a specific area's system.