Bonus is a reward from company for an employee who gave the best work to the company. Reward is important to get the employee's loyalty. Basically employee want to be appreciate what they do and Company want employee's loyalty. There must be 'win win' solution between them. Then this paper explain how to determine bonus in Enterprise Resource Planning at Human Resource Management module based Key Performance Indicator on. There are several ways to determine bonus. the bonus is determined by how long the employee has worked at the company. It makes some disadvantages for the company, it caused no efficient human resource. The company has to give them a bonus based on years of service, not experience and skill. There is no guarantee if an employee has more years of service, then more profit the company gained. Furthermore, it can impact customer loyalty.