The researchers have several differences of opinion regarding the most optimal SCAPM mathematical formula and predict returns on Islamic stocks. This study aims to compare the 3 SCAPM models with a proxy for Inflation, Zakat and SBIS so that the most optimal model and better explanatory power can be predicted in predicting stock returns . The sampling technique used was purposive sampling and obtained 13 shares. Data analysis is done by calculating the Mean Absolute Deviat ion (MAD), Mean Square Error (MSE) and the coefficient of determination through simple regression . Research proves that the Value Mean Absolute Deviation (MAD) and Mean Square Error (MSE) SCAPMI, SCAPMZ and SCAPMSBIS have the same result . Whereas SCAPMZ has the best explanatory power among the three SCAPM models as well as being better than the CAPM. I nvestor Islamic and conventional can use modeling SCAPMZ by proxy zakat in predicting the return stock.

Keywords : SCAPM , Stock , Zakat, Return.