Extended external reporting assurance: Current practices and challenges

This paper summarizes the UNCTAD ISAR WBCSD Webinar—Assurance on Sustainability Reports: Current Practices and Challenges, which explored views and practices on assurance of extended external reporting (EER) and identified challenges and potential ways forward. Stakeholders are demanding more accountability, as reflected in increased publication of EER and regulatory developments. EER can play an important role in rebuilding trust by catalyzing corporate focus and disclosure of business-centric matters material to stakeholders including strategy, business model, governance, and greater transparency on other material non-financial matters. Relatedly, EER cannot rebuild trust unless disclosures are credible and viewed as credible. Therefore, it is important that assurance, and other credibility enhancing techniques, is developed alongside EER frameworks and takes account of regulatory initiatives. We expand on lessons outlined during the Webinar by highlighting questions posed by participants, providing a historical overview of European regulatory developments (e.g., Directive 2014/95/EU and a forthcoming revision), providing a historical overview of the IAASB’s development of ISAE 3000 and forthcoming guidance on addressing major challenges aimed at supporting EER assurance, and providing an overview of practice-focused publications addressing EER assurance. We conclude with an assessment of the way forward in regard to possible changes in the EER institutional setting, potential harmonization of EER standards, and the ability to provide reasonable versus limited assurance. Along with our companion paper (Venter and van Eck, 2021, 32), we contribute to the current discussion on EER assurance by providing a comprehensive assessment of the EER assurance landscape.