Past empirical evidence has demonstrated that employees' positive moods enhance their task performance. This study extends previous research by proposing an integrative model that examines mediating processes underlying employee positive moods and task performance. Data were collected at two points in time from 306 employees and their immediate supervisors in five insurance companies in Taiwan. Results showed that employee positive moods influenced task performance indirectly through both motivational and interpersonal processes. Specifically, employee positive moods affected self-efficacy and task persistence, which in turn led to higher task performance. In addition, positive moods influenced interpersonal helping behaviors (i.e., helping coworkers and coworker helping), which in turn led to higher task performance.