Tax avoidance
Tax avoidance strategies and loopholes tend to emerge within income tax codes. They get created when taxpayers find legal methods to avoid paying taxes. Lawmakers then attempt to close the loopholes with additional legislation. That leads to a vicious cycle of ever more complex avoidance strategies and legislation. The vicious cycle tends to benefit large corporations and wealthy individuals that can afford the professional fees that come with ever more sophisticated tax planning, thus challenging the notion that even a marginal income tax system can be properly called progressive.