Creditor reliance on accounting-based debt covenants suggests that debtors are potentially concerned with board of director characteristics that influence the integrity of financial accounting reports. In a sample of S&P 500 firms, we find that the cost of debt is inversely related to board independence and board size. We also find that fully independent audit committees are associated with a significantly lower cost of debt financing. Similarly, yield spreads are also negatively related to audit committee size and meeting frequency. Overall, these results provide market-based evidence that boards and audit committees are important elements affecting the reliability of financial reports.