Can halving income tax improve the quality of export products in small and micro enterprises?
摘要
We employ a regression discontinuity design (RDD) to examine the effect of halving income tax on the quality of export products among small and microenterprises, leveraging the preferential tax policy introduced in 2014 as a quasi-natural experiment. A 50% reduction in income tax has a significant positive impact on the quality of export products in this sector. A series of robustness checks—including nonparametric regressions around the cutoff, local polynomial estimations, and placebo tests—confirm the consistency of our results. Mechanism analysis suggests that the policy operates through two main channels: increased investment in fixed assets and greater input into R&D. The study further finds that the quality-enhancing effect of the income tax halving policy is not universal across firms. The heterogeneity analysis shows that the effect is statistically significant for state-owned enterprises, industrial enterprises, and smaller firms, whereas it is insignificant for private enterprises, foreign-invested enterprises, non-industrial enterprises, and larger firms. These findings provide theoretical insights for optimizing future income tax policies to support small- and micro-exporters.