This study explores how parenting couples use their relationship to support each other after their child's autism diagnosis by assessing the role of dyadic coping and parenting sense of competence as predictors of their coparenting quality. Mothers and fathers raising a child on the spectrum (N = 70 couples) individually completed self-report questionnaires measuring stress appraisal, dyadic coping, parenting sense of competence, and coparenting. Parents were recruited 1-36 months after their child's autism diagnosis and data were analyzed using the actor-partner interdependence model. Parents' dyadic coping and sense of competence were related to their level of coparenting. Partner effects were found as mothers' dyadic coping was positively linked to fathers' coparenting and a higher sense of competence among fathers predicted mothers' coparenting. Further research is needed to understand how these effects evolve throughout the child's development stages.