In this paper, we use meta-analytic methods to investigate possible sources for the large variation in empirical findings about the income elasticity of money demand. Our results suggest that the broadness of the monetary aggregate, the inclusion of wealth and the consideration of financial innovation exert a significant influence on estimated income elasticities. Furthermore, we find substantial cross-country differences, in particular between the US and other countries. These differences can, to some extent, be explained by the macro-feconomic environment and the dissemination of payment cards.