This article addresses the question of how the courts of integration unions, the Eurasian Economic Union and the European Union, embody ideas of social justice in taxation through their legal positions. By analyzing decisions of the EU and EAEU courts on indirect taxation in cross-border transactions, the author substantiates the thesis that, by formulating legal positions based on individual factual circumstances, the court is able to ensure not only formal fairness in the integration union law but also embody the idea of social justice in its tax system.