The International Public Sector Accounting Standards have been seen as a path towards the modernization of governmental accounting, and many countries have made efforts to adopt them. The purpose of this article is to analyse the stimuli and barriers to the adoption of International Public Sector Accounting Standards, as well as their main benefits, using a structural equation model. The research methodology is based on a questionnaire sent to American and European Union countries that has been used to construct a structural model, and our results show that comparability and modernization are direct benefits of International Public Sector Accounting Standards implementation, and that both adopter and non-adopter countries value these positive impacts. This justifies the process of harmonization that the European Commission recently started.