Parallel career tracks have become more prevalent today, especially in Brazil, where more than a quarter of all postgrads have one. Despite its growing popularity, little research has tapped into this new career phenomenon. This study examines whether having a parallel career track leads to negative work outcomes related to sustainable careers, such as higher absenteeism and lower engagement, in comparison to a single career track. Cross-sectional and longitudinal data were gathered from 380 and 102 Brazilian professionals respectively, who filled out an online survey. A normal and a repeated-measures multivariate analysis of variance were used to examine whether work outcomes differed between those with parallel career tracks versus single career tracks. The findings indicate that parallel career tracks do not have different effects on individual sustainable employability outcomes when compared to single career tracks, including employability, engagement, absenteeism, presenteeism, and burnout. Therefore, organizations can face this new career trend without reluctance as it does not harm individual work outcomes related to sustainable careers. This study contributes significantly to improving the understanding of this new career format by examining the impact of parallel career tracks on individual work outcomes through a longitudinal design.