The empirical literature on the relationship between capital structure and firm cash flow volatility is inconclusive. We explore this relationship using several measures of a firm's cash flow volatility and econometric methods that account for the non-linear relationship of proportional variables. Overall, our evidence indicates that ceteris paribus a one standard deviation increase from the mean of cash flow volatility implies an approximately 24% decrease in the long-term debt ratio, a 26% decrease in probability of holding debt with over 10years to maturity, and a 39% increase in the probability of holding neither short nor long term debt.