The present work deals with the Defense budget in Brazil, analyzing the budget elaboration process of the Ministry of Defense and the Armed Forces, as well as the political and administrative mechanisms used for its consolidation at the federal level, and its approval by the Congress. From that point of view, the high degree of autonomy of the Arms in developing their budgets and defining their financial agenda is evident. The supremacy of civil power over the Armed Forces is one of the pillars that constitute a democratic regime. Although there have been significant advances in civil-military relations over the past 30 years, the high level of autonomy of the Armed Forces on issues such as the Defense budget, which should be widely discussed by civilian institutions, is an indication that the Ministry of Defense is not relevant to civil control over the barracks. In its organization as a corporation, the Armed Forces aim to maintain and guarantee its interests. Thus, in the scope of budgetary issues, to ensure their demands, various mechanisms are used, including an intense work of parliamentary advisory within the Congress.