Each online casino bonus has a unique wagering requirement associated with it. Often called playthrough requirements, these rules indicate what a player must do to withdraw winnings. For example, a 25X wagering requirement on a $100 bonus indicates that the bonus will have to be wagered 25 times $100 = $2500 before any winnings can be withdrawn. It’s really important to read the T&C of every bonus to ensure compliance with the rules.