This article analyses the workings of the new Spanish system of intergovernmental transfers, which has been in operation since 2009, and compares its expected effects with those of the model that was in force until 2008. The paper considers the effects of the new model at the base year of application and the growth over time of these effects. On the positive side, the reform has significantly reduced the dispersion of the distribution of resources per unit of need. On the negative side, the system has become very complex and obscure regarding the distribution criteria it uses; also, of the five (1987, 1992, 1997, 2002, 2009) major revisions of the system, this is the most expensive.