I think you're misunderstanding some of the moving parts here. All of those deductions you described would be taken either way, whether the tax is on the individual or on the corporation. They are already taken today to shave down corporate tax liability. So at best, the objection you're raising is a zero sum game. But even worse than that, and as a matter of fact, there would be less incentive to fulfill all of the compliance burden of tracking those deductions if corporations were not taxed but individuals were.