A key feature of the International Integrated Reporting Council's (IIRC) agenda to improve corporate reporting is to encourage companies to use Integrated Reports to disclose their underlying business models. However, extant research suggests that the IIRC's distinctive business model concept is not well understood. This paper aims to unpack and critically evaluate the core features of the IIRC's business model concept. To unpack the IIRC's business model, the paper conducts a structured comparative analysis of the IIRC's model against eight influential alternatives in prior business model research. The paper then evaluates the extent to which Integrated Reporting's distinctive business model is: (1) internally coherent and consistent; and, (2) consistent with the IIRC's broader reporting objectives. The paper identifies tensions in both these areas. Since the IIRC's business model is central to its agenda to improve corporate reporting, these tensions are relevant to both Integrated Reporting research and broader discussions about whether, or how, disclosing business models advances mainstream reporting frameworks.