This study is on the impact of effective accounting information system in fostering customer services and efficiency. The importance of accounting information cannot be overemphasized, Accounting records and statements are very essential tools in the achievement of firm’s goals. This research work was driven by certain objectives which include, to examine the efficiency of accounting information system in use in the banks and to ascertain the various approaches for presenting this information system that is being used by banks. Survey and sampling method were used for data collection. The relevant sources of data drawn for this work include questionnaire, interviews, textbook and journals Acts. The tools employed for data analysis were table, simple percentage method while the proposal hypothesis was tested with the chi-square (x2) statistic. Based on the research carried out, the researcher found out that the problems that led to ineffective use of accounting information in bank are the inconvenience customer’s encounter in the banks due to poor accounting information system, poor communication system and lack of good publicity of available product services To this end, the researcher recommended that the management should employ other modern and more reliable means of communications such as the internet and email, so that information will flow smoothly and continuously.