The aims of this study are to examine and analyze: The effect of socialization of the Law on the Harmonization of Tax Regulations on knowledge of taxation and tax revenue, The effect of the voluntary disclosure program (PPS) on tax knowledge and tax revenue, The tax knowledge in mediating the effect of socialization of the Law on the Harmonization of Tax Regulations on tax revenues, The tax knowledge in mediating the effect of voluntary disclosure programs on tax revenues. The research population is a personal taxpayer registered at the KPP Pratama North Makassar. The number of research samples was 100 respondents using the slovin formula. Data analysis using Partial Least Square (WarpPLS) analysis tool. The results showed that the Socialization of the Law on the Harmonization of Tax Regulations had a significant effect on increasing tax knowledge, but had no significant effect on tax revenues. The voluntary disclosure program has a significant effect on increasing tax knowledge and tax revenue. Tax knowledge is a mediating variable in the effect of socialization of the Law on the Harmonization of Tax Regulations on tax revenue, while tax knowledge is not a mediating variable in the effect of voluntary disclosure program on tax revenue.Keywords: Socialization, voluntary disclosure program, personal taxpayer