PT Agung Teknik Rental is a company engaged in heavy equipment rental services. In carrying out its business activities, PT Agung Teknik Rental experienced several problems caused by the absence of a system that could facilitate cash and payroll records. A cash and payroll information system is used to process data and transactions related to cash and salaries to produce useful information for planning, controlling, and operating a business. This study aims to create a desktop-based cash and payroll information system to help overcome problems in the object of study. The Rapid Application Development (RAD) method is used to develop the system. The system modeling language used is Unified Modelling Language (UML). The UML diagrams used in this study are use case diagrams, class diagrams, activity diagrams, sequence diagrams, and deployment diagrams. The system is built by using the Visual Basic .Net programming language. The output of this system is a sangu report, cash receipt report, cash disbursements report, weekly payroll report, monthly payroll report, and employees credit cards. The system that has been built can help in terms of recording, producing several reports needed by management, and bridging financial information between sections.