Subject This paper studies hardly-predictable factors causing a significant decrease in the regional economic reliability of planned decisions on investment. Such factors arise due to the diversity of local conditions and the level of development of the regions' social structure. Objectives The paper aims to study the directions of improvement of planning of investment volume in projects at the regional level. It also aims to assess the economic reliability and factor impact on budgetary means usage. Methods For the study, we used the methods of analysis and synthesis, statistical and cause-and-effect analyses of the business projects material. Results The paper develops an organizational structure of the investment corporation and enlarged structural and functional model of assessment of the economic component of reliability of the planned decisions taking into account destabilizing factors of project investment. It offers options for the improvement. Also, the paper presents a developed model of level of risk impact on profit indicators. Conclusions The main destabilizing factors leading to reduction of the reliability of planned decisions in subsystems of corporate structures can be divided into three components: social, organizational-technological, and the economic ones.
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