Bonuses are an integral part of a player or a team contract. Spend time in painting your best and mid-case performance scenarios and attribute a monetary or marketing value to it. E.g.: 15 goals or more in the league will give your player x amount of extra income in the form of a bonus – a bonus could also be in the form of a marketing commitment, but be careful – marketing commitments in retainers and bonuses = a bad negotiation!