The allocation is as described above, the money you made in that state divided by the total income. You expenses would be the actual expenses to go with that state's income.
As an athlete, you may be hit with the "jock" tax. You may have to file if you had income regardless of the expenses to go against it, depending on the state's threshold. Rates and filing requirements vary from state to state. On top of the state income tax, some cities, such as Pittsburgh, Pennsylvania, can charge a municipal tax (in addition to state income tax) on athletes for games played in certain venues.
If you want to reply with the state's that you don't want to file, we can go in search of when you must file.
@Tennisfam
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