The objective of this thesis is to determine the influence of technology (Electronic Data Interchange and Electronic Invoicing) adoption and implementation on buyer-seller relationships in business-to-business market. In addition, this study aims to identify if the impact on the buyer-seller relationship differs depending whether a company implementing electronic invoicing is an EDI-user or a non-EDI company is adopting digitalization from scratch. As a theoretical framework, this study applies the taxonomy designed by Cannon and Perreault. The framework has been tested and found appropriate in an earlier research examining the impact of electronic invoicing on buyer-seller relationships in the business-to-business market. The empirical part of this thesis focuses on identification of changes in the business-to-business relationships along the corresponding framework dimensions. The methodology applied in this thesis is qualitative. The research comprises the study of three case companies that operate in different fields, such as textile production and marketing, machinery and power plant building, and airlines.