Abstract: Enterprise income tax is an important component of enterprise tax payable. Excessive tax burden occupies enterprise funds, thus reducing enterprise R&D output (Li , 2013). This paper uses the "income tax expense" and "main business income" items in the financial reports of Chinese a-share listed companies to construct tax burden indicators and the cumulative value of effective invention patents of enterprises to measure the R&D output of enterprises. It is found that corporate income tax burden is negatively correlated with R&D output, and this negative relationship is only significant in non-high-tech enterprises. This article has the reference significance to the present tax revenue optimization reform and the promotion profession healthy development..
Keywords:pharmaceutical industry; Tax burdens; High-tech enterprise
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