The subject matter analysed in the paper is a voice in the discussion about the catalogue and content of baking law principles, which combines a theoretical analysis of the law, reference to the existing achievements of scholars in the field, and current changes in the law of the financial markets. It is an attempt at systematizing existing principles, both old and new, concerning the activity of banks. In this context, it also presents the evolution of the Polish legal system under the influence of the EU law, an increasingly strong tendency for public law to encroach upon the sphere of private law, and a visible attempt to take a new, social, aspect into account in baking activity (a citizen’s legitimate economic interests). The analyses particularly take account of the impact on the content of the latest legislation concerning, for instance, orderly restructuring of banks and prevention of financial exclusion.