Purpose: Over the last three decades, the role of intellectual capital (IC) in ensuring an organization’s competitiveness has increased significantly. The purpose of this paper is to analyse and evaluate the evolution of the concept of (IC) by showing its transformation from resource to capital, while offering a new perspective on the structure of (IC). Design/methodology/approach: The formation and development of (IC) is studied on the basis of literature review, logical and comparative analysis. The new structural components of (IC) are defined upon studying the relationships of the relevant concepts and the content of the concept at organizational level today. Findings: In the scientific literature, (IC) is mainly viewed as a resource or set of resources an organization uses for creation of competitive advantage and value. Using the information gathered about different views on (IC), this study shows the development of the sources of the organization’s competitiveness: from resource to (IC). Research limitations/implications: This study offers the authors’ view on the nature of the concept of (IC) showing (IC) as a business asset. The analysis of the concept is focused at organizational level. Originality/value: The study explains the differences between the interrelated concepts: knowledge, competence, performance and (IC). The authors offer an improved definition of (IC) by showing the evolution of its content and offer their own approach to the structure of (IC) that might facilitate tracking this asset in the organization’s accounts and promote effective management of the asset.