| This study contributes to an emerging literature that critically questions the effects of political connections on the innovation incentive implemented by government and the degree to which R&D, at the center of innovation subsidy and tax incentive, boosts firm performance. The relationship among political connections, government subsidies, tax incentive, R&D intensity and firm financial performance of manufacturing private firms listed on the small-and-medium size enterprises board in China is analyzed with data from 2011 to 2013 on a three-stage structure. Finally, to control for potential endogeneity, the study further employs the instrumental variable(IV), two-stage LS and Double Residual Analysis models to make a robust test.Out investigation and study indicate the following:(1) Private firms with politically connected managers enjoy more innovation subsidy and tax benefits.(2) Both subsidy and tax benefits have mixed effects on private firms’ R&D intensity.(3) Subsidy do lead to additional innovation output, which refers to patents here, but tax benefits do not.(4) A significant positive influence of R&D expenditure on its gross margin rate and firms’ value is exhibited, but in terms of firms’ value, the positive impact of R&D decreases significantly over time which is mainly caused by the imbalanced structure of R&D expenditure. |