The decentralisation of social security in general, and old-age pensions in particular, has been proposed by several nationalist parties in Spain. The purpose of this article is to analyse the rationality of this proposal, taking into account efficiency and equity issues. It is divided into four sections. The first introductory section reviews the most important literature on fiscal federalism, applying it to pensions. The second section analyses the division of competencies in Spanish old-age benefits, focusing specifically on legal aspects. The third describes the degree of decentralisation of public transfers for the elderly in several countries: Belgium, Canada, Germany, the United States and the United Kingdom. The final section evaluates the current Spanish system, considers the possibility of decentralisation in the light of economic efficiency, territorial equity and lessons learnt from other federal countries, and examines the evolution of the principal quantitative variables regarding the old-age pensions in the different Autonomous Regions.
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