Pension reform is now on the national agenda in most post-Soviet countries.
These countries have highly informalized economies, which means that large areas of economic activity go unreported to the authorities. This paper deals with the problem of pension reform in a highly informalized post-Soviet economy, Ukraine. It includes an analysis of causes and consequences of informalization, a general description and analysis of trends in the Ukrainian pension system, and a discussion of different approaches to reform. The paper describes an approach to modeling labor and capital flows between the formal and informal sectors using a gravity model. It also reports and discusses results of simulations of different scenarios of pension reform in Ukraine.