The purpose of this study was to examine the effect of thin capitalization with to cash effective tax rates as the proxy for tax avoidance. Control Variable  used in this research is key management compensation, firms size, and profitability.The method used in this research is an analytical descriptive. The sample used in this research consist of 20 companies from manufacturing sector listed in Indonesian Stock Shariah Index (ISSI) in 2011– 2016. Sample selection methods used in this research is purposive sampling. The analysis methods used in this research is multiple regression analysis.The results show that the thin capitalization has a significant influence on cash effective tax rates as the proxy for tax avoidance. Key management compensation  as control variable  has not been able to prove the effect on tax avoidance and   firms size profitability have a significant effect on cash effective tax rates as the proxy  for tax avoidance.