The article proposes a scientific and methodological approach to assessing the level of promotion of fiscal policy of sustainable development, uniting a set of indicators of realization in the country of 17 SDGs. Applying the principle of the hierarchy of diagnostic knowledge, the assessment of the level of support for fiscal policies for sustainable development is presented through the linguistic variable, with the separation of measures of influence on the economic, social and environmental blocs. The hierarchical relationship between the state parameters and the level of support for fiscal policies for sustainable development is graphically presented as a logical inference tree The approach has been tested by measuring the level of promotion of fiscal policies for sustainable development in Ukraine for two scenarios, This will make it possible to predict the impact of the country’s policies. According to the results of the study, it has been proved that the level of support for the fiscal policy of sustainable development in Ukraine suppresses the implementation of 17 SDGs, and the nature of the changes tends to a pessimistic development scenario, and the total index for promoting fiscal policies for sustainable development decreases annually.