What is the role of the presidency and ministries in the legislative production of the Executive Branch? From a transactional approach to the relationship between the president and ministers we seek, through the identification of the authorship of the legislative initiatives of the Executive, evaluate the factors that influence the president to delegate legislative decisions to the ministries or centralize decisions in the presidency. The hypotheses tested using a logistic model for rare events is that the increase in ideological distance, the number of ministers involved in the decision and the institutionalization of the presidency increases the probability of centralization, while the increase in the legislative strength of the parties of the ministers involved decreases the probability of centralization. The results indicate that these factors matter to understand the process of legislative formulation within the Executive and the choice that the president does.