One way to reduce taxation is to invest your corporation.
If you invest through your own corporation, the money you make is taxed much more leniently than if you invest in your own name.
In the United States, corporations come with other benefits, too.
For example, debts and liabilities are placed in the corporation's, not the owner's, name, which insures against limited losses on investments gone awry.
When you're an employee, you earn, get taxed, and then try to live on what's left.
When you're protected by a corporation, you earn, invest or spend as much as you can, and then get taxed on what's left.
It's no surprise, then, that corporations can help people get rich very quickly.