The aim of the present study was to investigate whether parental daily distress in terms of negative emotions is associated with the daily variation in parental use of psychological control with their children. Whether parental positive emotions play a role in the use of psychological control was also investigated. The participants were 149 Finnish families with a child between the ages of 6 and 7 years. Parents' negative and positive emotions, children's misconduct, and parental use of psychological control when interacting with their children were measured daily using diary questionnaires filled in by the mothers and fathers over 7 successive days in the fall term of the children's first grade and, for replication purposes, again in the spring term. The results of multilevel modelling showed that, after controlling for the level of children's misconduct on a particular day, mothers' and fathers' negative daily emotions were related to a high level of psychological control in parenting. This relation was evident particularly when combined with parental perception of a high level of child misconduct. Positive emotions, in turn, were not found to be related to the daily variation in the use of psychological control. The results showed further that, at the level of individuals, mothers' and fathers' high overall level of negative emotions across the week was related to a high overall level of psychologically controlling parenting.