If I play a slot machine, put in $100 (proof from an ATM withdrawl in that casino on that day), I hit a $2000 jackpot, a W2G is issued. I continue playing that slot machine and lose all of, including the $100 I started with.
I understand that I can't deduct the $100 loss (money I started with), but I can report on my tax return that I lost the $2000 to show a net of $0 gain.
My question: how do I prove that I lost all $2000 plus the $100 I started with?
I don't use a players card, so a casino statement isn't possible. I also don't have a cash out receipt (since I played until I lost all of it). Where is my proof? Other than a record on a spreadsheet I maintain?
