This article is the final part of the complex author's research, and is a continuation of the previously published sections of the article in this journal (DOI: 10.18184/2079-4665.2016.7.1.136.140; DOI: 10.18184/2079-4665.2016.7.3.132.136).In the previous sections, the author examined the features of modern Russian socio-economic state policy in general and its financial component in particular. The answers to the questions were found and a systematic view of the essence of the state socio-economic policy was given. It was shown that the economic potential of the state determines the level of development and use of the three only possible production resources at all times. This is living labor (human resources companies), materialized (past) labour (main production funds) and material and energy resources developed and being in production turnover. Russia, like no other state in the world, has the potential all these production resources for timely, complete and quality provision of reasonable material and spiritual needs of all its citizens.Purpose: the aim of the presented final part of the research is a critical assessment of the tax legislation in force in Russia, and the reasoned justification that a reasonable tax system is an essential tool for sustainable economic growth.Methods: the methodological basis of the research was the General scientific methods of cognition (dialectic; coexistence of historic and logistic approaches; structure and function analysis; expert evaluation of social-economic policy).Results: considering Russia's economic potential and its use, it was noted that the modern state socio-economic policy is contrary to the objective economic laws of the formation of the social state. This creates favorable prerequisites for the formation of state-oligarchic capitalism in Russia, that is, the merging of private business with government officials. In words, this is accompanied by a fierce fight against corruption in the higher echelons of power, but in reality only contributes to its prosperity. Such a socio-economic policy inevitably leads to a greater lag in the economic development of Russia from the advanced post-industrial countries, rolling it to the margins of world development, and the transformation of our state into a raw material appendage and supplier of cheap labor for the progressively developing countries. It is inadmissible not to understand this to persons responsible for state social and economic policy.Conclusions and Relevance: the proposals on improving the Russian state tax policy as one of the most important conceptual bases of the country's successful social and economic development have been developed. When deciding on documents so crucial for the country, it is necessary to be guided not by the lobbying of narrowly departmental and personal interests, but by conceptual scientific bases. They should determine the social and economic effectiveness of such a policy in the development of a society that really strives to achieve the main values in the life of each person: the knowledge of the truth, a longer life expectancy, sufficiency and well-being.