The management of IT carve-out projects is very challenging due to the strict time frame, the severe contractual penalties, the huge number of stakeholders and the various as well as unique IT tasks that have to be conducted. Up to now, there is no instrument for evaluating the readiness of the IT for a carve-out and also not for managing such a project. In order to address this, we develop a maturity model based on expert interviews and a literature review on success factors of IT carve-outs. The elements as well as the usage of the IT carve-out maturity model are explained. The maturity model has been evaluated theoretically based on design principles and during a case study in the financial services industry. The developed maturity model can be used by practitioners for the management of IT carve-outs and also by researchers to examine IT carve-outs in empirical research.