Emerging or early adulthood is the life stage spanning 18–25 years of age. In Australia, anxiety and affective disorders (often classifi ed as ‘common mental disorders’) are prevalent in this age group and suicide is also a concern. Professional mental health care can reduce the long-term impact of these mental health problems and protect against the development of severe forms of these disorders. However, up to three-quarters of young people with mental health needs do not seek professional help for their condition. This study aimed to examine the extent to which belief in the need for autonomy and intentions to seek help from informal help-sources act as barriers or facilitators to seeking help from a mental health service for symptoms of a common mental disorder and suicidal thoughts, in a sample of 641 emerging adults aged 18–25 years. For common mental disorders and suicidal thoughts, results reveal that the family of origin has an important influence on mental health service access among emerging adults, but also, that the growing independence and autonomy of emerging adults needs to be accommodated if mental health treatment services are to be accessible to this important age group.