The objective of this research is to determine the critical success factors of a tax collector website in a country with an emerging economy. In the method, a questionnaire is applied to 488 taxpayers in Northeastern Mexico, and factor analysis is a statistical tool. The results show that the top five success factors are citizen satisfaction, service quality, information quality, ease of use, and confidence. The results show the need to adapt the technologies to the citizens for their better performance and usefulness, so the originality of the research is that there are few empirical studies in the country.