Ive been a CEO of my small construction company since 1996. Accountants will set up a corp according to your situation so a different corp has different rules. There are HUGE benefits to being a corp paying much less in taxes and investing back into company use the toys like cabins, boats, land...etc. Doesnt draw red flags like a sole proprietorship will.
While profits to shareholders are taxed as income, i believe the initial profit (because its passed on) is a tax deduction to the corp as expenses...like normal payroll.