The Duty to State Reasons: Why Every Administrative Decision Must Explain Itself

This page is a translation of the original Portuguese text, provided for convenience. It deals with Brazilian law. If there is any discrepancy, the Portuguese version prevails. Read the original in Portuguese

Every administrative act that imposes a restriction, denies a right, or decides a case must state clearly why it was taken. When that explanation is missing, vague, or merely repeats the wording of the law without tying it to the facts, the person affected has a concrete way to challenge the decision and, often, to have it annulled.

The duty to state reasons is not a formality. It is a safeguard

A statement of reasons sets out the factual and legal grounds that justify a decision by the public administration. It is not the same as the ground itself (the situation that authorizes the act). It is the written explanation that connects that situation to the conclusion reached. It is how citizens come to understand why they were refused, denied, or penalized.

Law 9.784 of 1999, which governs federal administrative proceedings, is explicit on this point. Article 50 lists the cases in which a statement of reasons is mandatory, including acts that deny, limit, or affect rights, acts that impose sanctions, and acts that decide appeals. The rule also reaches states and municipalities that have no law of their own, through application by analogy recognized by the courts.

The ultimate foundation is in the Constitution. Article 37 binds the administration to the principles of legality, impersonality, morality, publicity, and efficiency. Without a statement of reasons, none of them can be measured. There is no way to know whether an act was lawful, impartial, or efficient if the official does not reveal the reasoning that led to the conclusion.

There is also an important procedural consequence. The so-called theory of determining grounds (teoria dos motivos determinantes) holds the administration to the reasons it declared itself. If an act was justified with stated reasons, its validity depends on whether those reasons are true and sufficient. A false or nonexistent ground taints the entire act, even if the authority could, in theory, have reached the same decision on some other basis.

When the reasoning is insufficient or merely apparent

There is a practical difference between an act with no reasons and an act with defective reasons. The first simply explains nothing. The second contains words, sometimes many of them, but does not let you understand why that decision was made in that particular case. Both open the door to a challenge, and the second is the more common.

Generic reasoning is reasoning that could be used in any case. Phrases such as “for failing to meet the legal requirements” or “given the absence of normative support,” without saying which requirement was not met and why, do not truly state reasons. They are boilerplate that could be cut and pasted into thousands of different decisions, which shows that no individual analysis took place.

Insufficient reasoning cites the legal provision but does not connect it to the facts. The official names the applicable article and stops there, as if merely referring to the rule explained how it applies. The decisive step is missing: showing why that body of evidence and those circumstances do (or do not) fit the legal provision invoked.

There is also contradictory reasoning, in which the grounds cancel each other out, and mismatched reasoning, in which the authority decides one thing and justifies another. A denial that acknowledges the requirements were met and still rejects the request is the classic example of internal inconsistency that undermines validity.

A statement of reasons sets out the factual and legal grounds that justify a decision by the public administration.

Sufficient versus generic reasoning: the difference in practice

Comparing two hypothetical denials helps fix the standard. Both reject the same request, but only one meets the duty to state reasons.

The right-hand column tells the person concerned exactly what to contest or fix. The left-hand column leaves them in the dark, forced to guess at the authority’s reasoning. That inability to mount a defense is what makes the decision open to attack.

How to spot the flaw and turn it into a challenge

The first step is to read the decision and ask: can I, from this text alone, reconstruct why I lost? If the answer is no, that is a strong sign of a defect in the reasoning. The test is that of the lay citizen, not of the specialist who already knows the case file from the inside.

The second step is to compare the stated grounds with the evidence in the file. If the authority said a certain document was missing when it was in fact submitted, the theory of determining grounds applies: the ground is false and brings down the act. If it said no request was filed when one exists, the same reasoning holds.

The third step is to check whether the decision addressed the arguments the interested party raised. The administration does not have to rebut every word, but it must respond to the central arguments. Deliberate silence on a point capable of changing the outcome is a significant omission and supports a request for annulment or for the case to be sent back.

In practice, a defect in the reasoning can be raised both in administrative proceedings and in court. In the administrative sphere, a hierarchical appeal (an appeal to a higher authority) or a request for reconsideration can point out the nullity and ask for a new, properly reasoned decision. In court, the mandado de segurança (a special writ to protect a clear and undisputed right against an unlawful act of a public authority) is a frequent tool when there is a clear and undisputed right and documentary proof of the defect, with no need to gather further evidence.

One important limit is worth noting. Recognizing a defect in the reasoning generally leads to annulment of the act and a return of the case to the administration, which must decide again, this time with proper reasons. It does not always, by itself, result in the right being granted directly. Even so, that reopening is often decisive, because it forces the authority to state its real reasons and frequently reveals that the denial could not be sustained.

Frequently Asked Questions

Must every administrative act state its reasons?

The requirement is broad, but not absolute. Article 50 of Law 9.784 of 1999 focuses the obligation on acts that deny, limit, or affect rights, impose sanctions, decide appeals, or depart from settled case law, among others. Routine or purely internal management acts with no effect on rights allow more flexible treatment. When in doubt, the duty to state reasons prevails, because the statement of reasons is what makes it possible to review the decision’s legality.

Is citing the article of the law enough to count as sufficient reasoning?

No, not if the citation stands alone. Referring to the provision is the beginning of the reasoning, not the end. The decision must show why that article applies to the facts of that specific case, linking the rule to the evidence and the concrete circumstances. A bare legal reference without that connection is usually insufficient reasoning and opens the way to challenging the decision.

I found out the stated reason is false. Does that annul the decision?

As a rule, yes. Under the theory of determining grounds, the administration is bound by the reasons it declared. If the stated ground is false or nonexistent, the act loses its support and can be annulled, even if the authority could, in theory, have decided the same way on another ground it did not invoke. What counts in review is what was actually written in the decision, not what could have been said.

As informações deste artigo são de caráter informativo e não substituem consulta jurídica individualizada. Cada caso possui particularidades que exigem análise específica.