This study analyses the impact of information systems on the daily work of accountants in Baixo Alentejo and Central Alentejo. For this purpose, questionnaire surveys were used to assess the perception of information systems users regarding seven dimensions: satisfaction; productivity; management control; innovation; decision-making; quality and information security. Data were processed and treated using descriptive and multivariate statistical analysis techniques. The results of the study showed that the dimension with the higher impact was decision-making and that the computer application most used by accountants was Primavera. The study also revealed that the computer application used by the accountant influences their perception of impacts in the dimensions studied.