This paper examines the direct effects of corporate tax on firm productivity along with the interaction effects of tax policy and R&D activity on productivity at firm level for over 13,062 firms during 2004-2011. Our main findings are first, that there is evidence for productivity convergence and we find that there is a positive robust relationship between R&D and firm productivity, whereas tax policy has a negative distortionary effect on TFP. Second, firms with greater export orientation do not seem to achieve much improvement in productivity, whereas the favourable productivity effect in the case of R&D-based firms suggests that if there are tax incentives in place for R&D type activity, it can promote innovation and drive productivity convergence (lagging firms closing the technology gap with those at the frontier), particularly so when there is a continued decline in overall economic activity. The results also show a significant non-linear effect of tax rate on firm-level productivity, identifying an inverse U-shaped relationship.
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Non-technical summary and policy implicationsThis paper argues that technological innovation is vital to enhancing firm-level productivity or efficiency growth, and thus investment in R&D can play a larger role in determining the differences in productivity across firms and help achieve productivity convergence. During periods of general economic slowdown, corporate tax policy may drive such innovation and therefore the paper examines the direct effects of corporate tax on firm productivity along with the interaction effects of tax policy and R&D activity on productivity at firm level for over 13,062 firms during 2004-2011. Our main findings are first, that there is evidence for productivity convergence and we find that there is a positive robust relationship between R&D and firm productivity, whereas tax policy has a negative distortionary effect on TFP. Second, firms with greater export orientation do not seem to achieve much improvement in productivity, whereas the favourable productivity effect in the case of R&D-based firms suggests that if there are tax incentives in place for R&D type activity, it can promote innovation and drive productivity convergence (lagging firms closing the technology gap with those at the frontier), particularly so when there is a continued decline in overall economic activity. The results also show a significant nonlinear effect of tax rate on firm-level productivity, identifying an inverse U-shaped relationship with a threshold level of around 45% as the optimum productivity-enhancing effective tax rate.