Chevron Deference After Loper Bright: What Changed

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Chevron deference was once a central rule of federal administrative law. For four decades, it directed courts in certain cases to accept a reasonable federal agency interpretation of an ambiguous statute, even when the court might have preferred a different reading.

That framework is no longer controlling. In 2024, the Supreme Court’s decision in Loper Bright Enterprises v. Raimondo overruled Chevron U.S.A. Inc. v. Natural Resources Defense Council, Inc. Courts must now use independent judgment to identify the best reading of a federal statute. The change affects how courts evaluate agency authority, but it does not make agencies legally irrelevant or erase every rule previously upheld under Chevron.

What the Chevron case originally held

The 1984 Chevron case involved the Environmental Protection Agency’s interpretation of the Clean Air Act. The dispute concerned whether multiple pollution-emitting devices at one industrial plant could be treated as a single “stationary source” under an EPA permitting program.

The Supreme Court articulated a two-step approach. At the first step, a court asked whether Congress had directly answered the precise statutory question. If Congress’s intent was clear, the court and agency had to follow it.

If the statute was silent or ambiguous, the second step asked whether the agency’s interpretation was permissible or reasonable. When the framework applied and the interpretation was reasonable, the court deferred even if it would not have selected that interpretation independently.

Chevron did not mean that agencies always won. Later decisions limited the doctrine’s domain, including questions about whether Congress had authorized the agency to act with the force of law and whether the interpretation came through an appropriate exercise of that authority. Courts also used other doctrines for constitutional questions, major questions, informal guidance, and agency interpretations of their own regulations.

Why Loper Bright overruled Chevron

Loper Bright arose from a federal fisheries program. The challengers disputed a National Marine Fisheries Service rule requiring certain fishing businesses to pay some costs of government-approved observers carried aboard their vessels.

The Supreme Court resolved the deference question by interpreting Section 706 of the Administrative Procedure Act. That provision directs reviewing courts to decide all relevant questions of law and interpret statutory provisions. The majority concluded that this command requires courts to exercise their own judgment about statutory meaning.

Under Loper Bright, ambiguity alone does not create an implied delegation to an agency. A court may not stop after finding more than one reasonable reading and then accept the agency’s choice simply because it is reasonable. The court must determine the statute’s best meaning using the ordinary tools of legal interpretation.

The decision was based on the APA. The majority did not decide the challengers’ separate constitutional arguments. Six justices joined the judgment overruling Chevron, while three dissented.

What independent judgment means now

Independent judgment places responsibility for legal interpretation on the reviewing court. The court examines statutory text, structure, context, relevant precedent, and other accepted interpretive tools without applying Chevron’s mandatory second-step deference.

This does not necessarily make every statutory challenge easy. Technical laws can contain gaps, broad standards, cross-references, and specialized terminology. Judges can disagree about the best reading, and ordinary rules governing precedent, procedure, evidence, and remedies still apply.

The new framework also does not turn every policy disagreement into a legal defect. An agency may choose among options that Congress lawfully left within its discretion. The reviewing court’s role is then to identify the delegation’s boundaries and determine whether the agency remained within them and engaged in reasoned decision-making.

Agency interpretations can still persuade

Loper Bright distinguished mandatory Chevron deference from the respect described in the older case Skidmore v. Swift & Co. Under Skidmore, an agency interpretation can have persuasive weight based on factors such as thoroughness, valid reasoning, consistency, expertise, and the overall power to persuade.

The difference is control. A persuasive agency explanation may help a court identify the best statutory reading, but it does not bind the court merely because the text is ambiguous. A conclusory, inconsistent, or poorly reasoned interpretation may carry little weight.

Longstanding agency practice can also matter as evidence of meaning, especially when it is contemporaneous with a statute or rests on relevant technical experience. Its significance depends on the interpretive context rather than a categorical command to defer.

Congress can still delegate authority

Loper Bright did not hold that Congress is unable to give agencies discretion. Statutes often expressly direct an agency to define a term, fill in details, make factual findings, or regulate according to standards such as what is “appropriate” or “reasonable.”

When a statute grants that authority, a court must respect the lawful delegation. It independently identifies the limits Congress imposed, then reviews whether the agency acted within those limits and used reasoned decision-making. The existence of discretion comes from the statute, not from ambiguity alone.

This distinction is important when evaluating a federal regulation. The legal question may be whether the agency chose the best interpretation of a fixed statutory command, whether Congress delegated a range of policy choices, or whether the agency followed required procedure. Those are related but separate inquiries.

What happened to earlier Chevron decisions

Loper Bright stated that it did not call into question prior cases that relied on Chevron to uphold particular agency actions. Those holdings remain subject to ordinary statutory stare decisis even though the interpretive method changed.

That statement does not mean every old regulation is permanently protected. A prior judgment about a particular action, a new challenge to a later action, and a claim involving a changed regulation can present different precedent and procedural questions. Courts must determine what an earlier case actually held and whether it controls the present dispute.

Overruling Chevron also did not itself reopen every expired deadline for judicial review. Filing periods, standing, final-agency-action requirements, preservation, and remedial doctrines operate independently. A person evaluating a live dispute needs the governing review statute and the current procedural history, not just a citation to Loper Bright.

Chevron is not the same as other review doctrines

Chevron addressed an agency’s interpretation of a statute it administered. It was not the general test for every kind of agency decision.

Under Section 706 of the APA, courts may also set aside agency action that is arbitrary or capricious, contrary to constitutional right, beyond statutory authority, procedurally defective, or unsupported by the evidence where the applicable review standard requires evidentiary support. Those grounds remain part of judicial review.

Auer or Kisor deference concerns an agency’s interpretation of its own genuinely ambiguous regulation, not its interpretation of a statute. The Supreme Court retained and narrowed that doctrine in Kisor v. Wilkie in 2019. Loper Bright did not decide whether Kisor should be overruled, so the doctrines should not be treated as interchangeable.

The major questions doctrine is different too. It concerns agency claims of authority involving matters of vast economic and political significance and asks for clear congressional authorization. The Supreme Court had applied that doctrine independently of Chevron before Loper Bright.

How the change affects agencies and regulated parties

Agencies can no longer defend a statutory interpretation in an APA case solely by showing that the statute is ambiguous and their reading is reasonable. A durable rulemaking record may therefore need a stronger explanation of statutory text, delegated authority, factual predicates, alternatives, and reasoned decision-making.

Regulated parties still do not receive an automatic victory by identifying ambiguity. A challenger must have a valid cause of action, satisfy jurisdictional and procedural requirements, and show why the challenged action fails under the governing standard. The court may independently conclude that the agency adopted the best reading.

The practical effect also varies by court, statute, agency, and dispute. The Supreme Court had rarely relied on Chevron in its final years, while lower courts used the framework more regularly. Post-Loper decisions are developing how independent judgment, Skidmore persuasion, express delegations, and existing precedent interact in particular statutory schemes.

How to read a post-Chevron dispute

Start by identifying what the agency interpreted. If the disputed language is in a federal statute, Loper Bright’s independent-judgment rule may be central. If the dispute concerns the agency’s own regulation, Kisor and other principles may instead frame the analysis.

Next, locate the exact statutory delegation. Broad rulemaking authority does not answer every interpretive question, but specific language can assign an agency discretion or fact-finding responsibility. The statutory text and binding precedent define that boundary.

Then separate the merits from procedure. A strong statutory argument can still fail if the lawsuit is untimely, the plaintiff lacks standing, the action is not final, or the issue was not properly preserved. Conversely, compliance with notice-and-comment procedure does not establish that the agency possessed the statutory authority it claimed.

Finally, read the actual opinions. “Chevron is overruled” is an accurate headline, but the operative rules include continued respect for persuasive agency reasoning, express delegations, prior holdings, and distinct review doctrines. Those qualifications determine how Loper Bright works in a specific case.

Sources

• U.S. Supreme Court — Loper Bright Enterprises v. Raimondo
• 5 U.S.C. § 706 — Scope of Judicial Review
• U.S. Supreme Court — Chevron U.S.A. Inc. v. NRDC
• U.S. Supreme Court — Skidmore v. Swift & Co.
• U.S. Supreme Court — Kisor v. Wilkie
• Congressional Research Service — Loper Bright and the Future of Agency Interpretations
• Congressional Research Service — Judicial Review of Federal Agency Action