Abstract: The relevance of this research is substantiated by the currently growing role of financial relations in the formation and execution of budgets of the constituent entities of the Russian Federation. The formation and implementation of budgetary policy of the Russian Federation determines the economic and financial framework for functionality of the region and life of the society as a whole. The goal is to assess the factors contributing to the formation of regional budget of the Khanty-Mansi Autonomous Okrug – Yugra. The subject of this research is the revenues and expenditures of the budget of Khanty -Mansi Autonomous Okrug – Yugra. Practical importance of the conducted research lies in the obtained results that allow the regional budgets to choose the way for improving budget security. The information base is comprised of the scientific works of Russian and foreign authors, educational-methodological publications, materials of the scientific conferences dedicated to the formation of regional budgets, legislative and normative acts of the Russian Federation,, reference materials of the Federal State Statistics Service Of the Russian Federation. The main conclusion consists in determination of the factors influencing the regional budget of the Khanty-Mansi Autonomous Okrug – Yugra. The author's special contribution lies in evaluation of the specificity of formation of budget of the Khanty-Mansi Autonomous Okrug – Yugra, as well as the methods aimed at minimization of budget risks for solution of the regional budgetary problems. The formulated recommendations for increasing budget security would promote the innovative development and improvement of budgetary and tax relations of the regional budgets. The theoretical significance consists in advancement of the theory of regional economy. The acquired results can be applied in theoretical substantiation of the strategic tasks of managing regional budgets.