PT. Sinar Ragamindo Utama , in the term of inventory sub section, needs an information system for an office expense the information system of the office. expense refers to manual system. The manual system that has been concern nowadays is less effective and efficient. The data system of documentation in bundle form causes the accumulation stack of document that has difficulties, in this case, the research, the deceleration of information needs (fulfillment) and report making (fulfillment). In this information system development process of the office employee expense, the writer uses the descriptive research method, which the collecting data the use is observing by examine the work process directly that has been done in the distance in order to get clearly illustration from the object observed, interview, that is, making a dialogue directly with treated arbitrarily people who gives authority in giving the explanation or information of data needed, and studying literature by finding out supporting bibliographies in data analyzed technique. The writer uses the method which is supporting the software according to waterfall whereas for data modeling uses the structured method. That is DFD (Data Flow Diagram) in illustrating functional model and ERD (Entity Relationship Diagram) to illustrate data model. After having through this phase in accordance with developing of method chosen, then in an office employee expense system implementation, the writer has taken advance in system examination that consist of alpha examination which the examination uses the method of black box examination focused of software functional requirement, and beta examination. That is field examination with data tabulating as an accurate value selection result. The aim of this study that the write achieved from the making of information system is for help in processing and managing office employee expense, and finding out office employee expense easily. So that it can make the fast and valid information.