WORK INCENTIVES IN CROATIA AND SLOVENIA: ANALYSIS USING MICROSIMULATION MODELS The paper analyzes the impact of the tax-benefit system on work incentives in Croatia and Slovenia. Unemployed and inactive persons and their hypothetical transitions to employment are considered. As the main indicator of work incentives, the participation tax rate (PTR) is estimated, as it represents a portion of additional income that is lost because taxes increase and benefits decrease in transition of a person from non-employment into employment. Unlike previous research, which was made for both countries on hypothetical data, in this paper for the first time the calculations and analysis of PTR are based on survey data, which for both countries gives a realistic picture of the situation in the field of work incentives. The analysis is carried out on data and the tax-benefit system for 2017, and the main tool used is EUROMOD, a tax-benefit microsimulation model for the EU countries. The results show that the average PTR in Croatia is of a moderate size of 31.3%, while in Slovenia it is 11.3 percentage points higher. People with higher number of dependent children and those with lower level of market income obtained by other household members are more likely to have a high PTR in both countries, and in Croatia people with only primary education will also have it. Key words: participation tax rate, work incentives, EUROMOD, Croatia, Slovenia