The monograph is devoted to the study of the financial (primarily tax) system at various stages of the development of feudal Russia of the XIV-XVI centuries. The monograph introduces into scientific circulation a large complex of sources (published and unpublished), gives a theoretical formulation of the question of feudal finances. The author explores two sides of the history of the tax system in Russia: firstly, the origin and modification of taxes, duties and duties in connection with the course of the socio-economic process, and secondly, the tax policy of the princely governments, the degree of its dependence on objective economic conditions and on the needs of the state related to the performance of its internal and external functions.