It seems that aside from all of the horrible things that Hitler was responsible for, he was guilty of having a major issue with the tax man. In fact, he had a habit of not paying taxes. It even resulted in him getting into trouble with his own party back in 1934 when he had, once again, not paid what he was due to pay.
However, this was something that Hitler was not exactly going to have any difficulty in overcoming. So because of the power that he held in his party and the country in general, he made sure that he was then made exempt from paying tax at any further point in his life, making him pretty much a unique individual.