Importance Forecasting of tax revenues income is actively used in the budget process. However, the level of reliability budget forecasts is regularly criticized, because quite often the actual volume of tax revenue is not the same as the forecast. The article deals with the problems of forecasting of economic and budgetary indicators during the budget process. Objectives The objective of the study is to analyze the reliability of forecast of Russia's social and economic development and the major fiscal indicators. Also, I aim to identify the factors that affect their level of reliability. Methods In this work, I use econometric methods to carry out a correlation analysis of linkages of economic and fiscal indicators projected in the budget process. A methodological research toolkit includes mathematical methods of statistical data processing. Results In order to identify possible limits to the level of confidence, different views of scientists on the existing limitations in the prediction process have been considered. This has demonstrated the feasibility and usefulness of determining the upcoming economic and budgetary processes. It was found that the indicators of the socio-economic development forecast of Russia are more reliable than the budget figures contained in the Federal Budget Act. This allows to prove the practicability of forecasting economic and budgetary processes. Conclusions and Relevance The obtained results can be used by the Government in the budget process. The study shows the level of reliability of forecasting economic and budgetary indicators in 2000–2015. Unfortunately, the developers of the project of Federal budget often underestimate the revenue projections.
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