In tax law, whether and to what extent a dispute over tax assessment between the tax administrative authority and the taxpayer can be resolved through the conclusion of a compromise with the taxpayer are not fully clarified in either practice or theory in Taiwan. Moreover, the tax administrative authority in our country practice often used to consult together about taxation levy in order to settle the dispute of tax assessment. What really means this nature and effectiveness of tax consultation, which exactly has also been a difficult problem in our practice. The author will attempt to clarify these issues and propose answers in this article through the comparative law study.