Attention Doctors, Dentists and Engineers! What are Professional Corporations (PCs) and what are the benefits of them? A professional corporation (also called a prof corp.) is a legal entity that is used by doctors, lawyers, engineers, dentists, accountants, etc. They are allowed by the professional governing body and let the professional save money (think tax strategy and tax shelter) while keeping the integrity of the professional. Learn more about what professional corporations can and cannot do under Alberta law.