This ER diagram for customers and loans was created based on loan management requirements. During the transaction, the system can encode the debtors' information. The admin can see the status of the debtors and their transactions. They can handle the data required for information management and record the customer's request. The security and monitoring of lending/bank information and debtors' information status were features included in the ER diagram for customers and loans. These features were recorded in reports that served as the system's transaction history. Thus the system can handle and secure the debtors' transactions and their personal information.