he short answer is no. Only people who are professional gamblers need to pay taxes. Casual players like you and me are not required to pay any tax on winnings from any slot games or any other online casino games as well as winning earned on sports betting sites. If you happen to be deemed as a professional poker player with your only source of income coming solely from poker tournaments and online casinos, then you may find yourself in trouble with Canada Revenue Agency (CRA) if you don’t report your winnings. As long you’re a casual player you should have nothing to worry about.