We investigate how marginal corporate tax rate affects corporate policy changes in response to a regulatory credit crunch. With a surge in debt due to a fiscal stimulus after 2008, the Chinese government rolled out the “deleveraging” program in 2015 which, through tightening monetary policies, restricting credit flows, and regulating shadow banks, significantly increased firms’ cost of debt and the incentive to deleverage. With a difference-in-differences design, we find that high-tax-rate firms reduce leverage to a less extent than low-tax-rate firms after the initiation of the deleveraging program. This effect is stronger in non-state-owned firms and firms with less non-debt tax shields. More importantly, through retaining more debt, high-tax-rate firms reduce dividend and switch to equity financing to a less extent, and also cut less investments in fixed assets, R&D and human capital. We conclude that tax constitutes an important factor in shaping the micro-economic consequences of a credit crunch.