A concentrated debt structure can facilitate creditor coordination, which reduces the financial distress cost in a liquidity default but also increases the risk of a strategic default. Debt concentration affects the sensitivity of leverage to tax through these two forces. We show that firms with a more concentrated debt structure are more responsive to state corporate income tax rate increases in increasing financial leverage, suggesting that when the tax rate increases, debt concentration's role in reducing the financial distress cost matters more. The impact of debt concentration on leverage is more pronounced when firms are subject to a high default risk, have low asset redeployability, or have a low liquidation value. Additional debt covenants can facilitate low debt concentration firms to increase leverage after tax rate increases. Our findings suggest that debt concentration is an important factor influencing the tax sensitivity of financial leverage.

U.S. multinational enterprises repatriated over $300 billion under the 2004 tax holiday. The repatriated funds can improve debt financing environment of nonrepatriating firms, especially those that are financially constrained. We document that such an externality of the tax holiday increases debt financing and consequently investments for financially constrained nonrepatriating firms relative to less constrained nonrepatriating firms. Using private loan market data, we further confirm a link from repatriated funds to increased debt financing for financially constrained nonrepatriating firms. Overall, the 2004 tax holiday appears to have benefited the U.S. economy through its positive externality on the debt market.