Social communication and executive functioning challenges as well as co-occurring anxiety/depression may make acquiring the skills needed to manage daily life tasks difficult for diploma-track autistic youth, thus limiting their participation in adult roles. This study describes the associations between executive function, social communication skills, and internalizing behaviors on task management in academically capable autistic adolescents (n=46) using multiple regression with mediator analysis. The three predictors and youth age explained a moderate amount of variance in task management. Metacognition mediated the effect of social communication skills and internalizing behaviors on task management. Relations between underlying factors that influence self-management of daily life tasks are complex, supporting the need for multifaceted assessment and intervention approaches for academically capable autistic youth. [This is the advance online version of an article published in "Journal of Autism and Developmental Disorders."]