Level 6
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I don't know why they would have issued a 1099-MISC instead of W-2g; unless the winning didn't meet the criteria for issuing a W-2G.

However, I would treat the winnings and losses just as if it were a W-2G.  Losses are itemized.

 

I would be very careful about trying to file a Sch C as a professional gambler.  The standard to file in that status is very high, and would definitely create a red flag for audit.

 

This is a Supreme Court Case that lays out some of the criteria in which the Court found taxpayer to be a professional gambler. 

COMMISSIONER OF INTERNAL REVENUE, Petitioner v. Robert P. GROETZINGER

https://www.law.cornell.edu/supremecourt/text/480/23