ENThe article analyzes changes in the risk of in work poverty and its determinants in Eastern European countries. The growing disposable income of the population in these countries and the population employment do not ensure the minimum subsistence needs of some workers. Having completed EUROSTAT data analysis of eight Eastern European countries of the period 2005–2017, it has been found that the growing income inequality has the most significant impact on the growth of in work at risk of poverty. The increasing of households work intensity and upper secondary and post-secondary educated workers reduces the risk of in work poverty, but this does not compensate for the effect of rising income inequality. A lowwage “floor” employment regime with low compensatory social policies and weaker than in the “old” EU countries bargaining power of workers support the current level of risk of in work poverty in Eastern European countries. Key words: In work at risk of poverty, employment, household work intensity, income inequality.