Of course, you don't HAVE to pay taxes.
People do to avoid certain consequences.
You have to obey the law unless you want to pay the price for not doing so. Death, on the other hand, comes whether we want it to or not. The freedom to choose, I have said in previous lessons, is an integral part of being human and having free will. But, perhaps I have not explained freedom to choose well enough. He goes on to explain how intellectual beings comprehend a desired end and the means needed to achieve it.