HSA (Private Health Services Plan) is a Canada Revenue Agency-approved method to provide medical, dental, and vision benefits in a tax efficient manner. Did you know? A corporation can write off 100% of the costs related to its HSA and all expenses reimbursed are tax-free to the employees. Every business owner who has an incorporated company should have one. It is the most tax effective way to run health, dental, and vision expenses through the corporation. If an employer wishes to offer benefits to their employees, they can create a custom plan arranged by class.