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It is extremely important for the budget process to obtain accurate forecasts of potential tax revenues, especially in periods of disruption and crisis. The paper is devoted to the study of dynamics of tax revenues’ volumes in the budget of Ukraine and the forecast of their values during the crisis.The dynamics of tax revenues in the Consolidated Budget of Ukraine, studied by using randomized R|S-analysis, fractal and probabilistic analyses as well as entropy calculation based on the data on monthly tax revenues for the period 2011–2021, is anti-persistent, fractal-like and unpredictable based on parametric dependencies, simple and complex trends. The topological dimension of the lines of dynamics for tax revenues of all types of taxes is much higher than 1, and the Hirst index indicates either fractal similarity of dynamics or its chaos. The map of dissipation periods of tax revenues in Ukraine, determined on the basis of entropy calculation and periods of negative entropy production according to the dynamics of tax revenues, coincided with the periods of maximum reduction in their volumes. The most crisis periods in the formation of tax revenues are 2019–2020, for certain types of taxes – 2016–2020, but the dissipation of tax revenues is projected for 2021–2022.The comparison of the level of fractal similarity in dynamics of the volume of tax revenues and peculiarities of the dynamics of entropy and entropy production, allowed to substantiate the division of taxes into nine types, of which five were found in Ukraine.

The paper investigates issues, concerning financial planning at the enterprise. Methods and models of financial forecasting are analyzed and their unification is proposed. The main problems of financial instruments using (such as financial planning) are described. Planning is important element of management, which ensures achievement of strategic priorities. Effective financial planning is essential tool of achieving of the main goals of the enterprise - profit maximization and cost of the enterprise. As market conditions in Ukrainian market of goods and services have its own specificity, which is defined, on the one hand, by means of analysis, formation and allocation of financial resources, and, on the other hand, the sources of reserves increasing, in order to implement the operating and investment activities to ensure their sustainable financial development. It should be noted that the formation of these processes has a significant impact on both objective and subjective factors, such as instability of tax policy and regulatory legislation for national currency, the impact of the global economic crisis, reducing the resources and available current assets etc. Thus, the increasing volatility of external environment requires managerial entities to speed decision-making and direct financial planning and forecasting, in order to reduce the impact of exogenous and endogenous factors on the financial activities of enterprises.