The study investigated the client-enterprise profitability and loan failure of microfinance banks' (MFBs) borrowers in Ogun State with a population of forty seven MFBs where twenty MFBs were selected as sample size for this study. The survey design was used through the administration of questionnaire. The linear regression method was used in analysing data and it was found out that effective monitoring and constant record checking were ensured by the microfinance banks' staff that made the borrowers keep records of their business transactions through the positive correlation with loan size structuring, (X 2 =171.859; p-value<0.01 and correlation coefficient =0.416; p-value <0.01); enterprise profitability further confirmed the highest hazard on period of default with further evidence from the Omnibus tests of model coefficients (X 2 = 38.645, degree of freedom=5, P-value<0.001) as indicated in the statistical relevance of the model. It was recommended that there should be an interactive session (interview) between the loan manager and borrower for the establishment of facts stated in the loan request form; quality cash-flow analysis of the enterprises should be properly done before loan is granted to small and medium scale enterprises (SMEs) likewise there should be an effective monitoring of loan usage by monitoring team of the microfinance banks to avoid diversion.

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