Final answer:
The Employer Health Tax in Ontario is calculated on gross earnings, bonuses and incentives, and taxable benefits provided to employees.
Step-by-step explanation:
In Ontario, the Employer Health Tax is calculated on the total remuneration paid to employees. This includes A. Gross earnings, which are the total amount an employee is paid before any deductions. It also encompasses D. Bonuses and incentives, which are supplementary compensations above the base salary. Furthermore, the tax is levied on C. Taxable benefits that an employee receives as a part of their total employment package, such as health benefits. These benefits are often included in their income and, therefore, subject to taxes. In summary, the remuneration components upon which the tax is calculated can include wages, salaries, bonuses, or other incentives, as well as the monetary value of taxable benefits provided to employees.