Abstract: The digital transformation of business and the public sector has had a significant impact on business activities. New types of business have emerged, mainly carried out in the digital space. In addition, new means of payment have emerged: cryptocurrencies and digital financial assets. These facts are shocks to tax administration models created to interact with taxpayers engaged in traditional activities. In this regard, in 2020, the Organization for Economic Co-operation and Development (OECD) at the XIII plenary meeting of the Forum on Tax Administration proposed the concept of digital transformation of tax administration “Tax Administration 3.0: Digital transformation of tax administration.” Taking into account the noted factors, the article provides a theoretical analysis of the risks caused by digital transformation for the purposes of tax administration, and also considers the best practices for leveling risks, including through the digitalization of tax administration.
The subject of the study is the digital transformation of tax administration in the Russian Federation. The purpose of the study is to develop proposals for the development of tax administration in the Russian Federation, taking into account the best global practices, as well as using advanced technologies of the digital economy. As part of the study, the following research methods were used: retrospective analysis, synthesis, comparison and forecasting.
The article provides a general analysis of the phenomenon of digital transformation and the associated risks for the purposes of tax administration; OECD proposals for the digital transformation of tax administration were reviewed, including their advantages and disadvantages; actual approaches to the transformation of the tax administration model used in the Russian Federation are noted. The scientific novelty of the work is expressed in the proposed further directions for the development of tax administration in the Russian Federation, including: the development of electronic document management; expanding the use of Blockchain technology; using the capabilities of smart contracts to automate the process of calculating and paying taxes.
The solutions proposed in the study can be used in the practical implementation of measures to develop tax administration in the Russian Federation.

Abstract: An important role in the transformation of the economy of the Russian Federation is played by tax policy, which has a significant impact on the market for goods, services, capital and labor. In this connection, the article analyzes the theoretical aspects of the formation of the state tax policy under the mobilization model of economic development.
The subject of the study is tax policy as a tool for overcoming the economic crisis. The purpose of the study is to formulate principles for implementing tax policy in a mobilization economy, highlight its main elements and analyze their features.
The methodology of the work is based on general logical and historical-legal methods of scientific research, which allows, taking into account historical experience, to propose a theoretical basis for modern tax policy in the conditions of a mobilization economy.
The article provides a definition of the concept of tax policy in a mobilization economy. Based on the works of Russian scientists in the field of mobilization economics, the features of mobilization economics are highlighted for the purposes of forming tax policy. The study analyzes the historical experience of the Soviet Union in the period 1941-1945, on the basis of which the fundamental principles of tax policy in a mobilization economy are formulated. The article also develops a modern tax mechanism toolkit and describes its features. In addition, a comparison is made of tax regulation instruments for various models of economic development of economic macrosystems. An important part of the study is the structured and justified mobilization elements of tax policy.
The solutions proposed in the study can be used in the practical implementation of tax policy in a mobilization economy.

Abstract: In the article, the author examines the problems of taxation of income of foreign digital companies faced by the tax administrations of the countries of the world, including the Russian Federation.
The subject of the study is modern models of income taxation of foreign digital companies operating in Russia and the world.The purpose of the article is to develop new approaches to the tax administration of the income tax of foreign digital companies in the Russian Federation, both for the long term and to ensure the fiscal interests of the country in the near future.
Within the framework of the article, the author examines the modern concept of a permanent representative office of a foreign company, and also highlights the reasons why this concept is not applicable to organizations engaged in e-commerce. The author also gives an assessment of the feasibility of introducing a digital tax in Russia.
В  The scientific novelty of the work is expressed in the concept of the formation of a permanent representative office of a foreign digital company developed by the Author, as well as in proposals for its introduction into the tax system of the Russian Federation.
In addition, the author gives recommendations on the introduction of a digital tax in Russia, develops the main elements of the proposed tax, such as: the object of taxation, the tax base, the tax rate, the tax period and tax benefits for this tax.
Also, in order to assess the feasibility of introducing a digital tax by the Author in the conditions of limited open analytical data on cross-border e-commerce in Russia, an assessment of the economic effect for the country from the introduction of this tax is given.

Abstract: The article is devoted to the problems faced by the tax authorities of the Russian Federation in the tax administration of e-commerce, and possible ways to solve them. The subject of the study is approaches to improve the current model of tax administration in the Russian Federation.The purpose of the article is to describe the new approaches and methods developed by the Author, the use of which can contribute to improving the effectiveness of the e-commerce tax administration model in the Russian Federation.
Within the framework of the article, the author highlights the features of e-commerce, which currently do not allow tax authorities to apply existing models of tax administration. Taking into account the highlighted features, the author formulated proposals for the creation of an automated multifactor model of e-commerce tax administration using Blockchain technology. The scientific novelty of the work is expressed in the development of fundamentally new, previously unused approaches to the tax administration of e-commerce.
One of such approaches is the use of the risk matrix of transactions on the accounts of individuals for the purposes of tax administration of e-commerce in the B2C segment. This matrix allows you to verify the reports submitted by organizations engaged in e-commerce, as well as to identify individuals engaged in entrepreneurial activities without registration.
Also, the article formulates proposals for the introduction of a model of tax administration using online platforms, through which the bulk of e-commerce currently occurs.
In addition, the article reflects proposals for the development of the existing model of electronic document management, allowing tax authorities to introduce smart contract technologies, which are an integral part of the Blockchain network, into the process of tax administration.

Abstract: The subject of the research is the VAt tax base created in the process of rendering electronic services by foreign companies in the Russian Federation. The article is devoted to the development of the approach to evaluating the tax base of foreign suppliers of electronic services in the territory of the Russian Federation. Using the data provided by the Federal Tax Service and Central Bank, the authors calculate the bounds of the VAT tax base potential for transborder supplies of electronic services. They also evaluate the degree to which the applicable Russian legislation is observed as well as the correpsondence between the applicable Russian legislation and fundamental principles of VAT, in particular, the principle of neutrality in relation to international service trade. The methodology of the research is based on general logical adn empirical research methods that allow to calculate a potential VAT tax base for digital services rendered by foreign companies in the territory of the Russian Federation and to compare it to a declared one. The authors demonstrate that a potential VAT tax base for eletronic services significantly outstrips a declared one. Moreover, they conclude that exemption from VAT tax in accordance with Subclause 26 of Clause 2 of Article 149 contradicts to the VAT neutrality principle for transborder supplies. Recommendations made on the basis of the research results can be used by tax authorities and tax policy agencies to improve the quality of tax administration and harmonize the rules of taxation of transborder digital services.