This paper studies the effects of credit supply disruptions in a dynamic stochastic general equilibrium (DSGE) framework. First, this paper examines the effects of credit supply disruptions in the business sector. The model with financially constrained households generates a bigger decline in aggregate consumption and GDP than the model without financially constrained households. The reason is that the spillover effect from the business sector to the household sector occurs through a labor income channel. With financially constrained households in the model, a collateral channel strengthens the spillover effects and amplifies business cycles. Then this paper examines the effects of credit supply disruptions in the household sector. A tightening of household credit conditions causes a substantial drop in aggregate consumption, which pushes inflation downward. Debt deflation further depresses consumption, labor demand, and investment, altogether generating a sharp decline in GDP.