In this paper, the public budget is seen as an instrument of government action capable of making government actions feasible or not, depending on how it is formalized. The point of reference is that decisions in the area of the public budget have a strong correlation with the central ideas of the mandates and have repercussions on the public administration as a whole. Consequently, budgetary issues influence the possibilities and mode of action of the state beyond its specific field. This centrality places the instrument as a vector, or veto, in the formulation of public policies.