Here’s a real world example that happened while I was in Vegas for the UNLV game and had to do tax stuff with.
I hit a jackpot on Keno and won $1750.
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They gave me a W2G form (after writing down your social and signing a paper) with what I won and the machine number and the attendant etc. They can remove any percentage you want for fed taxes. Then they give you cash or a check for the amount and you gotta keep that form for tax season and report it under “other income”.
But what that form doesn’t say is that I gave all that money back the subsequent days gambling. I have to report that loss. I can prove that with a few atm transactions with the name of the casino on the transaction.
Boom $1750 in winnings + $1750 in losses = $0 winnings and no tax liability.
Also remember you only have to prove if you get audited but I have a folder of ATM transactions saved by year just in case plus I have an excel I track my win/loss personally.