The purpose of this study is to identify the attributes that determine the customers loyalty to its IT consulting services suppliers. We started this study with a bibliographical research on the concepts of services, quality, satisfaction, loyalty, relationship, retention, customer bonding and characteristics of the IT consulting market. After that, it carried through interviews with executives from different segments. A survey was elaborated based on the bibliographical research and the interviews. A loyalty model was created using the independent variables brand, relationship with the sales team, support, relationship with the consultants team, price, service, switch barriers and the dependent loyalty variable, resultant of the agglutination of satisfaction, repurchases and recommendation. The research findings showed that the attributes brand, relationship of the consultants team, price and service had been most important to explain the loyalty. The findings showed that 54% of the customers are truly loyal, 19% as prisoners (spurious loyalty), 6% as accessible (latent loyalty) and 21% as of high risk (loyalty absence). It also showed that the public sector is less loyalty (25%) than other sectors.