?If the company needs a funding source by staying compliant with Islamic law, there is an option, namely to take financing at an Islamic bank or by issuing sukuk. Both financial instruments are sources of Islamic funding th at are currently growing and being widely studied by researchers. Along with its development the question arises how the existence of Islamic banks whose main business is in the financing sector with the continued growth of sukuk issued by corporations. This study examines the relationship between these two Islamic funding instruments by examining the impact of the growth of corporate sukuk on the ratio of Islamic banking in Indonesia. This study uses monthly secondary time series data from June 2016 to June 2019. The dependent variable is the ratio of Islamic banking to the Capital Adequacy Ratio (CAR) as an indicator of capital and Financing to Deposit Ratio (FDR) as an indicator of the level of liquidity, while the independent variable uses outstanding corporate sukuk and corporate sukuk yields as a proxy for sukuk growth. Testing data in this study uses quantitative methods with the Vector Auto Regression (VAR) model and the Granger Causality Test. This study also uses Impulse Response Function (IRF) and Variance Decomposition (VD) for further analysis. The results of this study indicate that the growth of the corporate sukuk market has a relationship with the ratio of Islamic banking. The increase in the volume of outstanding sukuk has a positive effect on Islamic bank CAR, but has a negative effect on Islamic bank FDR. While sukuk yield variables produce a positive relationship with Islamic bank FDR but have a negative relationship with Islamic bank CAR. So that the growth of corporate sukuk is relevant to be considered as an exogenous factor affecting the ratio of Islamic banking in Indonesia.