The purpose of this study is to ascertain the impact of e-billing, tax literacy, tax socialization, and the quality of financial information on the efficiency of self-assessment. This study uses primary data. Respondents in this study are taxpayers who have NPWP. The analytical tool used is multiple linear regression. The results of the partial test (t-Test) of the e-Billing variable on self-assessment, where the t-count value is greater than the t-table value, namely 1.985 (4.079 > 1.985), tax Literacy is a variable on self-assessment, and the t-account value is greater than the t-table value, namely 1.985 (2.821 > 1.985), financial accounting information on self-assessment, and the t-count value is greater than the t-table value, namely 1.985 (2.305 > 1.985) which can be interpreted as meaning that e-Billing tax literacy, financial accounting information has a positive and significant effect on self-assessment. Tax socialization is a variable on selfassessment, and the t-count value is smaller than the t-table value, namely 1.985 (1.838 < 1.985). This means that the socialization of taxation has a positive but not significant effect on self-assessment. Based on the results of the F test, the calculated F value is 51.364, while the F table value is 2.47, so the calculated F value is greater than the F table value (51.364 > 2.47), and the significant level is 0.000 < 0.05, so it can be concluded that the independent variable has a significant effect simultaneously on the dependent variable.