This study is designed to investigate the effect of job performance on employees’ Career Advancement (CA). Two aspects of job performance such as task performance (TP) and organizational citizenship behavior (OCB) have been investigated in this study. This study also contributed for a further knowledge by adopting the multiple sources of ratings on individuals’ job performance (e.g. self-ratings, superior-ratings). The data was gathered through mail survey method from 390 paired respondents. The result presented that self-rating of TP was the only factor that associated with employees’ intrinsic CA. There were no significant relationships between self-ratings of OCB on employees’ extrinsic as well as on employees’ intrinsic CA. This study also showed that superior-rating of OCB was the only factor that associated with employees’ intrinsic CA. There were no significant relationships between superior-ratings of TP on employees’ extrinsic CA, as well as on employees’ intrinsic CA. This study contributed some new knowledge which can be channeled to the Ministry of Education (MOE) to improve the level of TP and OCB among teachers, particularly in the Malaysian context.