Stimulation of investment activities due to internal resources is one of the important task of Russian economy development this period of time. Legal regulation of investment activities of Russian legal entities cannot be full-fledged without using tax instruments. Current tax legislature suggests different options of reduced tax rates which are used in purpose of creation favorable investment conditions and attract investors to different territories. One of such friendly arrangement to potential investors appear to be agreements of business operation which are take into account interests and capabilities of legal entities. Essence and peculiarities of such agreements are not quite clear because of its legal nature and influence on tax relationships.