부가가치세 납부면제 및 간이과세 기준금액 설정에 관한 연구

Recently, the administrative authority has increased the exemption and simplified taxation threshold in response to the request for re-organization of the simplified VAT system. To investigate whether this action maximizes social welfare, we review the literature and discuss the optimal threshold for exemption and simplified taxation through empirical analysis using actual VAT payment data. To this end, we extend the theoretical model of Keen and Mintz(2004) to reflect the VAT system in Korea to provide a theoretical background. We also utilize VAT payment data following Brashares et al.(2014). By introducing various assumptions to the parameters and cost structure introduced in the theoretical model, we set 24 scenarios and evaluate optimal threshold for maximizing social welfare using grid search. The optimal thresholds for exemption and simplified taxation are 6～33 million KRW and 12～38 million KRW, respectively. Despite considerable variation in optimal thresholds, all results lead to a common fact：the threshold for VAT exemption or the share of individual businesses lying between the thresholds for exemption and simplified taxation turns out to be small. This observation supports the idea of revising the simplified taxation system. This paper has importance in that reflect Korea’s VAT system by expanding the preceding research. Also, another significance of this paper is that we conducted an empirical analysis using the administrative data of the National Tax Service and provide policy implications.