I don't know if all the states make them file yet. They were working on it. The way it was some states made you file on what you made within their borders. I know all the states with income tax were trying pass laws to collect. NFL, NBA. MLB MLS, NHRA, IHRA, and any other traveling circus would be targets.Let me expand on that: I was wondering how they would have to file, typically like any of us or do they have to file a return every state that they run an event in? This question is never covered, so I guess why not ask it. Do they apply to the same tax situations as we may? Probably not.