This article examines the interaction of regulation and employee voice in the residential aged care sector. In particular, it considers the regulatory forces shaping the expression of voice in the human services sector through the examination of three aged care providers. It suggests that in a sector characterised by low levels of unionisation and a preponderance of non-union workplaces, employee voice does not act as a significant regulator of managerial decision-making, rather a combination of external and internal constraints that regulates the expression of voice. This study identifies the regulatory role of location, labour law and social norms. It also highlights that the importance of these constraints will vary in different organisational contexts and as a consequence of interaction with internal regulation. Such internal regulation is most commonly expressed through the exercise of managerial prerogative.