This study determines the relationship between Cost Accounting Techniques and Financial Performance of Small and Medium Scale Enterprise in Kisii County. In this study, we have two variables, Cost Accounting Techniques as the independent variables and Financial Performance as the dependent variable. Both of these variables have their dimensions and measures which will assist the researcher to find out the relationship Cost Accounting Techniques have on Financial Performance of Small and Medium Scale Enterprise in Kisii County. The methodology adopted was descriptive survey design to collect both primary and secondary data. The population of this study consist OF 4,535 registered owners of small and medium scale enterprises in Kisii County. The sampling technique used was the non- probability sampling technique, also the sample size was determined using the Taro Yamane’s formula (1964) which was 367. The instrument used for data collection was the questionnaire in five Likert scale. 367 copies of questionnaire were distributed which 248 was retrieved for the analysis. The data were analyzed using simple percentage and mean score, while hypotheses were tested using the Spearman Ranking Order Correlation with the help of SPSS to establish the significance of relationship between the various variables used in the Study. The result indicated that there is a significant relationship between Cost Accounting Techniques and Financial Performance y. From the above it was recommended that Small scale business operator units should ensure that complete and accurate business records are kept because they are essential for decision making. This can be ensured by undertaking course training about records keeping, and hiring knowledgeable and skilled workers.