China initiated a major reform for capital taxation in 2004. Completed in 2009, it introduced permanent tax incentives for firms' investment in fixed assets. We explore a unique firm-level dataset from years 2005–2012 and utilize a quasi-experimental design to test the impacts of the reform on firms' investment and productivity. We find that, on average, the reform raised investment and productivity of the treated firms relative to the control firms by 38.4 percent and 8.9 percent, respectively.