Ensuring the sustainable development requires economic growth stimulation through fiscal relaxation policies, preserving, at the same time, the stability of budgetary resources necessary for social programmes financing. The efficiency of a taxation diminution measure is determined by the surplus of budgetary revenues entailed by the economic growth surplus and the budgetary revenues diminution due to legal rate decrease. The respective impact measuring is possible by using macroeconomic models, especially those related to financial programming. The article presents an algorithm for budgetary revenues assessment in correlation with the indicators of real economy, developed by the author based on a financial programming model.