This article discusses the main possible directions for coordinating the tax policy of member countries of economic and monetary unions. The regulatory role of tax instruments in regional integration associations is assessed. The relevance of the article is due to the fact that with the accelera tion of integration processes in various regions of the world, fiscal policy becomes particularly important. Therefore, the research of representatives of various scientific schools pays much attention to the analysis of the impact of the fiscal component on the economies of the member countries of the associations. At the same time, approaches to the organization of taxation within economic unions differ significantly. The activation of integration processes in the Eurasian Economic Union (EEU) necessitates the convergence of the legislation of the member States in the field of taxation. At the same time, the harmonization and unification of legislation on indirect taxes is particularly relevant, since these taxes have a significant impact on price formatio n and provide a significant part of budget revenues. According to the authors of the article, in the conditions of deepening integration in the EEU, a well-thought-out distribution of powers in the field of tax regulation between state and supranational bodies that ensure a consistent convergence of the tax systems of the participating countries, taking into account the economic situation and the interests of all members of the Association, becomes particularly relevant. Measures to ensure the elimination of double taxation within the Union are proposed. The authors conclude that it is necessary to harmonize the tax policies of the member States of the Eurasian Union. At the same time, the harmonization of taxation in the countries of the Union should become a condition for the formation of a currency zone on the territory of the EAEU.