The importance of identity statuses for individuals' well-being and psychosocial functioning has been demonstrated abundantly in high school and college samples. The present longitudinal study complemented this research line by (a) focusing on identity clusters or statuses in a sample of 300 working young adults (21–40 years of age), and (b) investigating the concurrent and prospective implications of these identity statuses for work engagement and burnout. Based on a recently developed dimensional model of personal identity formation, five distinct statuses were obtained, largely replicating previous research on identity clusters. These five statuses were meaningfully differentiated on the basis of their associations with the outcome measures, with the identity achievement status showing the most optimal profile (low burnout, high engagement) and the diffused diffusion status the least adjusted profile across time. Implications and suggestions for future research are discussed.