The Latin expression ex lege designates the production of legal effects arising directly from the rule, regardless of the expression of will by the parties or a constitutive judicial ruling. It is a concept that cuts across the entire legal system, with special incidence in Civil, Administrative, and Tax Law, conferring automaticity and imperativeness to the legal command.
Concept and Doctrinal Foundation
The term ex lege (by operation of law) identifies normative efficacy that dispenses with volitional acts or judicial sentences for the constitution, modification, or extinction of rights and obligations. The legal nature of this institute lies in the self-executing capacity of the legal rule, which operates by virtue of the fulfillment of the factual assumptions provided for in the legal precept's factual support. It differs, therefore, from ex voluntate acts, where legal efficacy stems from private autonomy, and from ex judice acts, which depend on state intervention for the perfection of the right.
Origin and Historical Evolution
The root of the concept dates back to Roman Law, notably in the rigorism of the lex. The Roman legal system already distinguished effects that operated ipso iure (by the law itself) from those that required ope exceptionis. In the Brazilian legal system, the transposition of this concept was consolidated with the classic civilist codification, crystallizing in the idea that the rule is the primary and immediate source of rights, overcoming the need for judicial declaration in cases where the legislator's will is self-applicable.
Legal Provision and Practical Application
The incidence of the term is vast, covering various branches of Law:
- Civil Law: Article 1,784 of the Civil Code establishes the Principle of Saisine, by which the inheritance is transmitted immediately to the heirs, ex lege, upon the opening of the succession.
- Tax Law: Tax liability, in various modalities, operates by operation of law, in accordance with Article 121 of the National Tax Code (CTN).
- Administrative Law: The investiture in public offices or the vacancy of functions, under certain conditions, occurs by operation of the statutory rule (e.g., Law 8.112/90).
Current Jurisprudence and Understanding of Superior Courts
The Supreme Federal Court (STF) and the Superior Court of Justice (STJ) repeatedly apply the concept to rule out the need for judicial provision in situations of immediate efficacy. In the tax sphere, the STF, when judging cases of general repercussion, frequently emphasizes that tax incidence occurs ex lege, with the assessment being merely a declaratory act. Likewise, in Civil Procedural Law, procedural succession due to the death of a party (Art. 110 of the CPC/15) operates immediate effects, regardless of immediate formalization, by virtue of the material succession already operated ex lege.
Related Principles and Doctrinal Divergences
Modern doctrine, led by authors such as Miguel Reale, relates ex lege to the principle of legal certainty. The main divergence lies in the distinction between ipso iure efficacy and the need for subsequent judicial control. While positivist currents defend absolute self-applicability, the contemporary constitutionalist perspective argues that, even in ex lege effects, judicial control remains available for legality and constitutionality review, avoiding abuses under the guise of the "force of law."
Contemporary Relevance
In the current scenario, the application of ex lege is fundamental for dejudicialization and procedural speed. By recognizing that certain effects operate independently of a sentence, the legal system reduces the backlog of litigation, allowing the rule to fulfill its social purpose without the need for intervention by the Judiciary. Current interpretation prioritizes the objective efficacy of rules, reinforcing the role of the law as a self-sufficient instrument of social organization.
Legal and Jurisprudential References
- BRAZIL. Law No. 10,406, of January 10, 2002. Establishes the Civil Code. Art. 1,784.
- BRAZIL. Law No. 5,172, of October 25, 1966. National Tax Code. Art. 121.
- BRAZIL. Law No. 13,105, of March 16, 2015. Code of Civil Procedure. Art. 110.
- STF, RE 562.045/PR, Rapporteur Justice Ricardo Lewandowski, Plenary, judged in 2013 (Theme 237 - General Repercussion on the efficacy of tax rules).
- STJ, AgInt in AREsp 1,845,234/SP, Rapporteur Justice Marco Buzzi, Fourth Panel, judged in 2023.
