Let's imagine that I, without acting as a business, took income for work and then paid other people to do the work. All of that income would get double taxed, not just the profit. Corporations get a huge tax benefit compared to individuals. Imagine if you could deduct cost of living from your income tax.

Also a lot of that money only gets taxed the second time as capital gains, so while it's taxed twice it's two very discount taxes.