This paper studies the optimal contracting problem between shareholders and the agent in a general cash-ow setup, and offers a framework to quantitatively assess the impact of agency problems. Under the structural model of capital structure studied in Leland (1994), we solve the optimal employment contract explicitly, and nd that debt-overhang lowers the optimal leverage. Consistent with the data, our model delivers a negative relation between pay-performance sensitivity and rm size, and the interaction between debt-overhang and agency issue leads smaller rms to take less leverage relative to their larger peers. During nancial distress, a rm’s cash-ow becomes more sensitive to underlying performance shocks due to debt-overhang. We also consider the possibility of debt covenants to alleviate the debt-hang problem.