Cashback bonuses are calculated based on the net losses that the player incurs while playing games. The net losses are calculated by subtracting any winnings or bonus cash received from the total amount bet by the player. This means that the player doesn't need to win a single game to qualify for a cashback bonus; simply playing the games and incurring some losses will be enough. Although the exact parameters may vary from casino to casino, most cashback bonuses are based on a certain percentage of the net losses incurred.