Companies expect significant long-term gains in efficiency and productivity through digital transformation (DT). New ways of combining products, processes, and data-driven services, as well as new business models emerge. However, the rapid development of the DT leads to constraints regarding its realization. Barriers hinder companies to realize possible advantages out of DT. If firms promptly recognize potential barriers, they can reflect upon these challenges and can take well-coordinated countermeasures. Social, technical and socio-technical problems address different stakeholders and ask for specific solutions. Therefore, our study aims at developing a taxonomy for barriers to DT to enable researchers and practitioners to identify and classify existing barriers. For deriving the dimensions and characteristics, we collected data by conducting 46 semi-structured interviews with experts and enriched these by looking at the literature on DT barriers.