ObjectiveThis study sought to understand the prospective relationship between parents' jobs, parenting, and adolescents' subsequent school performance.BackgroundRecent research shows that parents' poor job quality and work–family conflict (WFC) are adversely associated with young people's mental health and socioemotional well‐being, with much less known about impacts on adolescents' academic outcomes.MethodWe used data from a nationally representative Australian cohort study to test a longitudinal model linking parents' job characteristics, WFC, and parenting warmth and irritability in early high school, and adolescents' academic achievement in middle high school. Separate models were run for mothers (N = 2,676) and fathers (N = 2,615), and additional multigroup models examined differences between low‐income and middle‐ and high‐income parents.ResultsFindings suggest that parents' WFC increases parenting irritability, which in turn is adversely associated with academic outcomes, particularly for low‐income mothers. Findings also showed that low‐income fathers' WFC was directly associated with poorer academic outcomes.ConclusionParents' WFC in early high school may affect adolescents' achievement in middle high school, with some risks compounded for low‐income households.ImplicationsThis study is among the first to establish a relationship between parents' WFC and adolescents' academic performance and highlights the importance of parents' job resources in supporting adolescent academic outcomes.