The last years the tax systems of the Republic of Uzbekistan have been carried out to improve by government. There is a number of changes have been particular, the most important directions of reforming the system of state tax service of the Republic of Uzbekistan. Therefore, how to implement effective measures to ensure full coverage of taxable items and expand the tax base through a system analysis of the dynamics of macroeconomic indicators and tax potential of the regions. In this article, we are discussing about improving the new way mechanism of assessment, analysis of the taxes process and tax capacity of regions.