This study aims to determine the effect of capital structure, profitability, and tax planning on the value of manufacturing companies listed on the Indonesia Stock Exchange (BEI) for the 2015-2018 period with managerial ownership as a moderating variable. The sample of this research is all manufacturing companies listed on the Indonesia Stock Exchange (IDX) for the 2015-2018 period using purposive sampling technique and the data obtained are 22 companies. The data analysis technique used descriptive statistical analysis, classical assumption test, and multiple linear analysis. The results of the partial analysis test show that capital structure has a negative effect on firm value, profitability has a significant positive effect on firm value, tax planning has a significant negative effect on firm value, managerial ownership is able to moderate the effect of capital structure on firm value, managerial ownership is able moderate the effect of profitability on firm value, managerial ownership is not able to moderate the effect of tax planning on firm value.