I did find this on the HR Block site
The payer must provide you with a Form W-2G if you win:
The payer must provide you with a Form W-2G if you win:
- $600 or more if the amount is at least 300 times the wager
- $1,200 or more in winnings from bingo or slot machines
- $1,500 or more in winnings from keno
- More than $5,000 in winnings from a poker tournament
- Any winnings subject to a federal income-tax withholding requirement
- More than $5,000
- At least 300 times the amount of the bet