The paper analyzes the regulations regarding professional ethics, deontology and discretion, in the hypothesis of professionals providing legal assistance during financial transactions. The research deepens the contradictions that appear between the obligation to respect ethical conduct and the obligation to disclose information regarding transactions that violate financial discipline in the light of the provisions of the EU law. The DAC6 Directive establishes that the potential fraudulent character of a financial operation shapes the obligation of disclosure to the competent authorities, incumbent on the intermediaries involved in any stage of the respective financial transaction. This prevision collides with the legal nature of professional secrecy, regulated mainly by national law, and affects the scope and the values protected in the domestic legal framework. The theoretical approach is followed by the jurisprudential perspective, both on relevant ECtHR and CJEU recent opinion. The result of the research highlights the conflict between the regulations of different levels when the obligation to inform counterbalances the legal protection of the fundamental rights and freedoms of citizens. It is pointed out that the EU law on disclosure obligation interferes with the professional discretion legal framework. The interest for further research emerges for establishing the ranking of legal norms that protect the fundamental rights and freedoms of citizens, against the higher interest of protecting the legal framework for carrying out legal financial operations.