Any gambling winnings are subject to federal income tax. If you win more thanR$5,000 on a wager, and the payout is at least 300 times the amount of your bet, the IRS requires the payer to withhold 24% for income taxes.
Gambling winnings are fully taxable and you must report the income on your tax return. Gambling income includes but isn't limited to winnings from lotteries, raffles, horse races, and casinos.