With judgment no. 50/2026, the Constitutional Court has brought clarity to one of the most delicate and debated issues in Italian tax and criminal law: the relationship between a criminal res judicata of acquittal and tax proceedings. This long-awaited ruling carries concrete and significant implications for taxpayers, businesses, and the financial administration.
The Starting Point: What Art. 21-bis of Legislative Decree No. 74/2000 Provides
Legislative Decree No. 87 of 2024 introduced into Legislative Decree No. 74/2000 — the primary legislative framework governing tax offences — Article 21-bis, an innovative provision of considerable complexity. The provision establishes, in essence, that a final criminal acquittal judgment, rendered on the grounds that «the act does not exist» or «the defendant did not commit it», acquires the force of res judicata in tax proceedings concerning the same material facts against the same party.
In other words, if a taxpayer is acquitted in criminal proceedings because the alleged conduct either did not occur or cannot be attributed to them, the tax judge cannot reach a contrary conclusion regarding those same facts. This legislative choice aims to prevent the paradox of a dual judicial truth: fiscal condemnation of one who has been acquitted in criminal proceedings.
The Questions of Constitutional Legitimacy Raised
The provision was not, however, without its critics. The Tax Courts of Justice of Piedmont and Rome had raised doubts regarding its compatibility with the Constitution, with particular reference to the right of defence of the Financial Administration. The concern was that the Italian Revenue Agency (Agenzia delle Entrate), not being a party to the criminal proceedings, could find itself bound by a res judicata formed in proceedings in which it had not directly participated.
The Constitutional Court rejected these objections, declaring the questions unfounded — some in the terms set out in the reasoning — thereby upholding the legislative framework, albeit with important interpretive clarifications.
Why the Provision Was Upheld: The Court's Reasoning
In its analysis, the Court highlighted several elements in support of the legislative choice:
- The quality of criminal proceedings as an investigative instrument: the criminal trial, with its procedural guarantees, represents the most appropriate forum for establishing the material truth of the facts. It would be contradictory to disregard its outcomes in tax proceedings.
- The institutional coordination between the Public Prosecutor and the Italian Revenue Agency: Legislative Decree No. 87/2024 itself established a close connection between the two institutions, enabling the Agency to participate actively and meaningfully in criminal proceedings. The right of defence of the Treasury is therefore not
