The adequacy of old-age pension systems depends on the efficiency of retirement plans offered to individuals. The purpose of this study was to identify which macroeconomic factors influence the investment efficiency of voluntary pension funds and employee pension funds in Poland. We verified whether there is any relationship between the rates of return of voluntary and employee pension funds and selected macroeconomic factors. We found that nominal and real rates of return of employee pension funds depend on the WIG rate of return. In case of voluntary pension funds higher nominal rates of return resulted from both more aggressive investment policy and better competencies of asset managers. The research findings are relevant for social policy as they provide useful information how to tailor investment policy of supplementary pension plans to better achieve the social and economic goals of the old-age pension system.