This study investigated the relationship of family socioeconomic status and proactive personality to career decision self‐efficacy in a sample of 336 Taiwanese college students. The results of the partial least squares path modeling analysis showed that both socioeconomic status and proactive personality were positively associated with career decision self‐efficacy. These findings support person input variables as being predictive of career decision self‐efficacy and provide career counselors with insight into how to design career interventions for improving college students’ career decision self‐efficacy. Implications for career counseling and suggestions for future research are discussed.