The paper builds upon the findings of Julia Black (2010) about the constitutional dimension of managing the financial crisis, and applies those findings to the context of Spain and Hungary. In particular it focuses on one of the recent quintessential EU agenda items, the constitutional debt-ceiling rules, and answers the question; how these rules interplay with the forming EU rescue mechanism for failing banks. It interprets the Spanish and Hungarian developments not only as a response to the requirements set out on a supranational level, but also as part of the post-crisis architecture of economic governance and the forming bank union. Either it is a Eurozone country like Spain or a non-Eurozone country like Hungary, these new constitutional provisions contribute to the strengthening of the EU and support the creation of a common economic policy. The sooner this happens the better it will enhance the global competitiveness of the EU.