The aim of this paper was to investigate the impact of determinants of accounting service quality. Data were collected from accounting service firms in Hanoi from 2017 to 2018. Both qualitative and quantitative meth-odologies were employed to analyze the impacts of each determinant. Questionnaires were designed with a 5 - point Likert scale, and the validity of the data were measured using Cronbach’s Alpha and Exploratory Factor Analysis (EFA). The results of the implementation of multiple regression method show that four determinants; namely Tangibles, Effectiveness, Empathy and professionalism had positive correlations with the accounting service firm quality in Hanoi, at different levels. Some recommendations were also made for improving the quality of the accounting service firms.