The aim of this study is to develop an expert system application called SME Emergency for working capital management (WCM) in Small and Medium-Sized Enterprises (SMEs). SME Emergency performs financial analyses for WCM and thus evaluates the WCM performance of the enterprise. There is no independent audit obligation for SMEs operating in Turkey. Therefore, the data of 283 enterprises listed in the BIST All Shares between 2012 and 2020 were used in the development of this application since they do not differ in terms of working capital characteristics, and the data of publicly traded enterprises are subject to independent auditing. The SME Emergency presents the general performance of the enterprise about WCM. In addition, it evaluates the success of the enterprise according to the industry within the framework of WCM determinants and presents its position compared with enterprises in the industry. In this context, the enterprise’s financial performance in terms of WCM can be interpreted, and suggestions can be made in the case of unsuccess.