Purpose The purpose of the paper is to study available methods and principles of taxation and substantiate a necessary introduction of technical innovation principle. Methodology The methodology background is systematization and classification methods. Also, we applied ones of regression and correlation analysis. Results We revealed available methods of taxation and presented that the selection should be based on the tax principles. These principles should be proceeded from the peculiarities and priorities of social and economic system development and be divided into three categories: the constitutional principles of taxation, the principles of tax process management and the principles of resolving tax disputes. We managed to illustrate it owing to proprietary structural and logical scheme of principles and methods of taxation in the tax system. Collectively, they are aimed at the tax system improvement. Therewith, application of technical innovation plays an important role. Recommendations On the base of revealed close and direct dependence of the tax system competitiveness on the extent of E-services integration in the tax practice through the countries worldwide in 2018, it is advised to add the technical innovation principle to the principles of the tax process management.