The research work is aimed at finding out the impact that internal control system plays to prevent fraud in financial institution. The case study for the study is Access Bank. The sample size of the respondents is 100 which comprised both the senior and junior cadre. The instruments employed to generate the information needed is Questionnaire and other financial document available as a secondary source. The statistical instrument used as analysis to gather the data is simple percentage and Chi-square. The research was able to find out the following result at the end of the research work:
- Ø That the effective "internal control system can prevent fraud
- Ø That despite the introduction of internal control system we still experience fraud
- Ø That there is effective internal control over what goes in and comes out of computer
- Ø That despite the fact that fraud is still experienced in the bank with the internal control system on ground. Internal control system is very important to check banking fraud.