Summary When conceptualizing work performance as requiring self‐control, scholars often employ a resource‐depletion perspective. However, this perspective neglects the role of self‐control motivation and self‐regulation strategies. In this diary study, we examine self‐control motivation (viz. motivation to control impulses) and depletion at the beginning of work and at midday as predictors of afternoon task performance. Additionally, we investigate morning aversive tasks as an antecedent of increased depletion and decreased self‐control motivation. Further, we examine the role of self‐regulation strategies (organizing, meaning‐related strategies, and self‐reward) for maintaining and improving performance when depleted or low in self‐control motivation. Data from a 2‐week diary study with three daily measurements (N = 135 employees; n = 991 days) were analyzed. Multilevel path modeling showed that self‐control motivation at the beginning of work and depletion at midday predicted afternoon task performance. We found that self‐reward in the afternoon counteracts the negative relationship between depletion and task performance. Further, we found an indirect effect from morning aversive tasks on task performance via depletion at noon buffered by afternoon self‐reward. Organizing and meaning in the afternoon were positively related to afternoon task performance. Findings suggest that self‐control motivation is important for task performance, in addition to low depletion. Moreover, results highlight that self‐regulation strategies are beneficial for task performance.