This article discusses the evolution of the total and social public expenditure in Uruguay during the 20th century. It analyzes the growth path of the social public expenditure and the extent up to which it could be preserved from the cyclical economic downturns and the fiscal constraints of the Public Sector. The paper finds a low long-run elasticity of public spending to GDP – leading to a slow growth of social public expenditure and a remarkable procyclical pattern of total and social public expenditure. It also shows that social spending, especially education expenditure, has often been used as an instrument to curb budget deficits. No distinctive «fiscal regimes» for the period could be identified.