by mgcfo » Wed Feb 13, 2013 8:18 pm
In the scenario you provide, there is probably nothing else you need to do (additional filings would be required if you were passing the income through a single member LLC taxed as an s-corp, but I doubt that's your situation).
As a professional gambler, you will file those earnings and expenses (if any) on Schedule C. In the contractor situation, those earnings will be listed on a second Schedule C. Make sure you track any out-of-pocket expenses to offset the contractor revenue on that applicable Schedule C.
In both cases, the payers will normally request a W-9 from you, but those are typically sent/mailed to you to complete which enables those entities to submit a 1099-Misc to you and the IRS each January.
I may be reading too much into your question, but on the paperwork question, there's always the possibility you may need a local business license in the contractor situation, but given the nature of the income, this is probably doubtful.