Does external assurance contribute to higher quality integrated reports?

Abstract

This paper contributes to the literature on internal benefits and positive capital market effects of integrated reporting by examining whether or not external assurance acts as a driver of high quality integrated reports. It answers calls for additional research on integrated reporting practice and is also timely, given the current discussions by standard-setters, regulators and other stakeholders on the need for integrated reports to be subject to some form of external verification. The research shows that an increase in the number of elements of an integrated report being subject to external assurance is associated with higher quality reporting. This is especially true when the assurance services are provided by one of the Big 4. The assurance engagements which contribute most significantly to report quality are those covering disclosures dealing broadly with social and environmental sustainability and compliance with the AccountAbility principles of materiality, inclusivity and responsiveness. In turn, if the assurance of only these aspects of an integrated report already improves report quality, there is a clear need for guidance on how the assurance process can be expanded to ensure that all material disclosures are subject to, at least, some form of verification.