What does a 40x wagering requirement actually cost me?

Wagering requirements tell you how much you must bet before bonus funds convert to withdrawable cash. A EUR 100 bonus at 40x means EUR 4,000 of qualifying bets. If the term reads 40x deposit plus bonus and you deposited EUR 100, the figure doubles to EUR 8,000. At a 96 percent RTP slot, EUR 4,000 of turnover carries an expected loss of about EUR 160, so the bonus is worth considerably less than its face value. Check whether the multiplier applies to the bonus alone or to deposit plus bonus before you accept it.