A clean understanding of managerial functions is very important for the accountant who must provide the necessary information which managers need to perform their functions. In a modern competitive economy the availability of relevant, timely and accurate information especially for planning controlling pricing and other decisions are the immense concerns to modern managers. Accounting provides information for decision making in any organization, information is very vital and indispensable for the success and survival of any organization. The concept of information in organization is more complex and difficult than the frequent use of this common word would suggest. Accounting information which is tool that provides information that can be sued by all non professionals as well as professionals who are willing to sue it properly to form a bank and information requirement in management decision making for a company to ensure and establish its existence, as a going concern it must aim at a food profitability scheme, profit optimization. This can only be achieved through efficient use of accounting information. Hence, this research work is prepared to show the need or ways in which accounting information serve as an aid to banks banking sector in decision making. In order to accomplish this research work, various types of data collection methods were adopted such as distribution of questionnaires, interviews and observations method which were basically adopted for both primary and secondary data. Also table and judgment techniques were used to analyses the data collected to prove the importance of use of accounting information as an aid to managerial decision making in banks banking sector. There was also a test of hypothesis where a decision rule was taken to reject the null hypothesis. In the course of this research, the researcher discovered some problems which militated against effective and efficient performance of banking sector ranged from the interpretation of data information to decision making. However, some recommendations were offered as to improving the supply and use of accounting information in assessing control and performance.