Research On The Income Redistribution Effect Of Personal Income Tax Refor

China’s personal income tax has undergone seven major reforms since 1994,and has played an important role in giving play to the effect of tax redistribution and shrinking rich and the poor gap,but its regulating effect is still not ideal.In 2019,after the new Tax Law,which adjusted the number of deduction for basic expenses,added special additional deductions,optimized the tax rate structure,and turned the collection model to a combination of classification and comprehensiveness.Due to the reduction of the average tax rate,the tax burden of some people is largely affected by this reform,but it still needs to be improved in its income redistribution function.Whether the new round of the reform can narrow the income gap and promote common prosperity,and how to further improve the shortcomings such as the "narrow upper and lower width" of the tax rate bracket and the imperfect deduction of expenses,is more conducive to reflecting the principle of fair tax burden and reasonable burden.Based on the above questions,the content consists of five parts.In the introduction,the background and significance of the research are briefly elaborated,and the relevant literature at home and abroad is sorted out and summarized,and the methods,innovations and shortcomings of this research are pointed out.The second part is the theoretical part,which uses the theory of income distribution,the theory of tax fairness,the theory of optimal tax system and the indicators to measure the effect of income redistribution,and uses a combination of qualitative and quantitative to compare and analyze the mechanism of the influence of various tax system elements on the income redistribution effect.The third part is the analysis of the current situation and problems,and analyzes the element changes in the past ten years through statistical data such as residents’ income and tax revenue.The fourth part is an empirical analysis,based on the CGSS(China Comprehensive Social Survey)data and measurement indicators in 2018 and 2021,showing the impact of different IIT elements on income redistribution before and after the reform.Section V makes recommendations on the results of the study.The main findings show that:(1)through the implementation of the 2019 New Individual Income Tax Law,many measures have led to a significant reduction in the average tax rate,which ultimately adversely affects the vertical fairness effect;(2)Compared with the different impacts in the reform measures,the increase in the exemption amount and the new additional deduction have increased the progression of personal income tax more obviously,the change of tax rate structure plays a leading role in the reduction of the average tax rate,and the overall function on income distribution is affected;(3)Different regions and different income groups will benefit from the reform effect after the implementation of the new tax law,and economically more prosperous regions and high-income groups will benefit more from this tax reform.Accordingly,this paper puts forward the following suggestions:(1)optimize the tax structure of individual income tax,increase the proportion of individual income tax in tax revenue,and expand the scope of syndrome revenue;(2)Flexibly adjust the deduction of basic expenses and refine the special additional deduction standards;(3)Strengthen the management level of China’s tax collection and payment,and improve the multi-party tax-related information sharing and individual tax credit system.