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Associate Consultant

Main Policy Areas: Fiscal and tax policy

Grzegorz is a fiscal economist with a strong flair for quantitative problems. Over his 12-year career, he has gained specialized knowledge and experience in estimating tax compliance gaps, tax expenditures, and the revenue and distributional impacts of tax reforms. Since 2012 he has been engaged in, and since 2015 led, the VAT Gap in the EU study. This pivotal study annually estimates forgone VAT revenue due to non-compliance and policy decisions. In addition to this, he has implemented and developed alternative methodologies for estimating tax gaps in all major tax instruments, using survey, audit, and national accounts data. Grzegorz possesses highly qualified expertise in using econometric, general equilibrium, and simulation models to assess the impacts of tax reforms.

Prior to joining Syntesia in 2024, Grzegorz has been an integral part of the Center for Social and Economic Research (CASE) in Warsaw, where he most recently held the positions of Director of Fiscal Policy Studies and Management Board Member. Over his 12 years with CASE, he led or contributed to over 60 research projects, evaluations, and impact assessments for the EU, governmental, and international organizations. Grzegorz’s consultancy work includes a tenure with the Eurasia Group, where he advised on political and economic risks, provided policy outlooks, and conducted thematic analyses on Polish economic policies. Since 2018, he has also worked on various global assignments for the World Bank. Beyond the EU, his work has impacted fiscal policies in countries such as Afghanistan, Indonesia, Georgia, Ghana, Kosovo, Kyrgyz Republic, Moldova, Oman, Serbia, Solomon Islands, and Turkey. Furthermore, collaborating with the IFC, he co-authored a study on investment determinants in emerging markets.

Grzegorz obtained his PhD from the Department of Theoretical Economics at the Warsaw School of Economics (Poland), where he has also served as Assistant Professor teaching courses at the undergraduate, graduate and postgraduate levels. Additionally, he holds an MA in Empirical and Theoretical Economics from the Paris School of Economics (France) and a joint MA in Models and Methods of Quantitative Economics from the University of Paris 1 Panthéon-Sorbonne (France) and the Autonomous University of Barcelona (Spain). Grzegorz also completed an MA and a BA in Quantitative Methods in Economics and Information Systems at the Warsaw School of Economics.

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