CORPTAX is a research group led by Petr Janský at the Institute of Economic Studies, Faculty of Social Sciences, Charles University, Prague, Czechia. We aim to establish how much multinational corporations pay in taxes, to what extent these taxes are paid in tax havens, and which factors drive these patterns. Ultimately, we aim to use theoretical, methodological and empirical innovations to transform the understanding of corporate taxation in a globalised world. We are an international team of researchers collaborating with leading academics worldwide as well as influential international organisations. CORPTAX has been funded by various research grants, including since January 2021 by the Czech Science Foundation (21-05547M).