The Loper Bright decision, handed down by the Supreme Court on June 28, 2024, overturned 40 years of legal precedent by eliminating Chevron deference. In a 6-3 ruling, the Court held that federal judges must use their own independent judgment when interpreting statutes rather than automatically deferring to a federal agency’s reading of an ambiguous law.1Supreme Court of the United States. Loper Bright Enterprises et al. v. Raimondo, Secretary of Commerce, et al. The practical consequence is straightforward: federal agencies lost a powerful legal shield they had leaned on since 1984, and regulated businesses, individuals, and courts now operate in a different balance of power.
What the Court Actually Held
Chief Justice Roberts, writing for the majority, ruled that the Administrative Procedure Act requires courts to exercise independent judgment when deciding whether an agency has acted within its statutory authority. Courts may not defer to an agency’s interpretation of the law simply because a statute is ambiguous. Chevron is overruled.1Supreme Court of the United States. Loper Bright Enterprises et al. v. Raimondo, Secretary of Commerce, et al.
The Court grounded its holding in the text of the APA itself. Section 706 directs the reviewing court to “decide all relevant questions of law” and to “interpret constitutional and statutory provisions.”2Office of the Law Revision Counsel. 5 USC 706 – Scope of Review The majority read that as a clear instruction that legal interpretation belongs to judges, not agencies. An ambiguous phrase in a statute is not an invitation for the agency to write its own rules. It is a question for a court to answer.
The Court did leave room for agency input. Roberts wrote that “careful attention to the judgment of the Executive Branch may help inform” the inquiry, but drew a sharp line: considering an agency’s view is not the same as deferring to it.1Supreme Court of the United States. Loper Bright Enterprises et al. v. Raimondo, Secretary of Commerce, et al.
What Chevron Deference Was
Understanding what changed requires understanding the rule the Court replaced. In 1984, the Supreme Court decided Chevron U.S.A., Inc. v. Natural Resources Defense Council, Inc., establishing a two-step framework that became one of the most cited rules in American law.3Justia U.S. Supreme Court Center. Chevron U.S.A., Inc. v. NRDC
The framework worked like this. A court first asked whether Congress had directly addressed the precise question at issue. If the statute clearly answered it, the court followed the statute. But if the statute was silent or ambiguous, the court moved to step two: it accepted the agency’s interpretation as long as it was “reasonable” or “permissible.”4Supreme Court of the United States. Chevron U.S.A. Inc. v. Natural Resources Defense Council, Inc. The theory was that agencies had more technical expertise than judges, and that when Congress left gaps, it implicitly trusted the agency to fill them.
In practice, the government won most disputes over regulatory authority. An agency’s reading of a vague law didn’t have to be the best interpretation or even the one a judge would reach independently. It just had to be reasonable.
The New Standard: Best Reading, Not Reasonable Reading
Under Loper Bright, courts must find the single best reading of a statute using every traditional tool of interpretation: text, structure, legislative history, and purpose. A merely reasonable reading no longer suffices. The court must determine what the statute actually means, not just whether the agency’s answer falls within a range of plausible options.
Judges are not required to ignore what agencies think. The decision preserves what is known as Skidmore deference, a lighter-touch standard from a 1944 case. Under Skidmore, a court can give weight to an agency’s interpretation based on the thoroughness of its reasoning, its consistency over time, and its overall persuasive power.5Justia. Skidmore v. Swift and Co. But Skidmore weight is earned rather than automatic. An agency with deep expertise and a well-reasoned position may still carry significant influence with a court. An agency that shifts positions between administrations or stretches a statute beyond recognition will find judges far less sympathetic.
The practical difference is significant. Under Chevron, an agency could change its reading of a statute between presidential administrations, and the new reading received the same deference as the old one so long as it was reasonable. Under the new standard, a court looks for the best reading of the law itself, and that reading does not shift with the occupant of the White House.
What Loper Bright Means for Federal Agencies
Federal agencies now operate on a shorter leash when they claim authority that isn’t spelled out in clear statutory language. Before the ruling, an agency could point to a gap or ambiguity in a statute and assert the power to fill it, and courts typically went along. That safety net is gone. If a statute doesn’t clearly authorize a particular fee, enforcement mechanism, or regulatory program, the agency risks having it struck down by a court conducting its own independent analysis.
This creates pressure in two directions. Agencies must draft regulations that tie more closely to explicit statutory text. Congress faces pressure to write clearer laws. When legislators leave vague language in a bill because they expect an agency to sort out the details later, that approach now carries real legal risk. Courts may not read those gaps the way the agency does, and the agency no longer gets the benefit of the doubt.
The shift also changes how regulated industries approach compliance. A company that disagreed with an agency’s interpretation once faced long odds in court, because the “reasonableness” bar was relatively easy for the government to clear. Now, challengers have a more level playing field. They still have to convince a judge that their reading of the statute is better than the agency’s, but the judge is free to agree with them without first asking whether the agency’s position was at least defensible.
Are Existing Regulations Safe?
The majority anticipated the concern that overruling Chevron could trigger a wave of challenges to decades of existing regulations. Roberts wrote that the decision “does not call into question prior cases that relied on the Chevron framework.” Holdings that specific agency actions are lawful remain protected by statutory stare decisis, the principle that courts generally stand by their prior decisions interpreting statutes.1Supreme Court of the United States. Loper Bright Enterprises et al. v. Raimondo, Secretary of Commerce, et al. Simply pointing to the end of Chevron deference is not, by itself, a reason to overturn a prior ruling.
That protection has limits. It shields specific court decisions that upheld specific agency actions. It does not necessarily protect regulations that were never challenged in court or agency interpretations that were never formally litigated. New challenges to agency rules, even old ones, will be evaluated under the independent-judgment standard. The question in each case will be whether the agency’s interpretation reflects the best reading of the statute, not just a reasonable one. How broadly courts apply the stare decisis protection remains an open question that lower courts are still working through.6Harvard Law Review. How Much of the Regulatory State is Safe Post Loper Bright
A companion decision the same term compounds the exposure. In Corner Post, Inc. v. Board of Governors of the Federal Reserve System, the Court addressed when the six-year statute of limitations for challenging a federal regulation under the APA begins to run.7Office of the Law Revision Counsel. 28 USC 2401 – Time for Commencing Action Against United States Many courts had treated the clock as starting when the agency issued its final rule, meaning old regulations became effectively immune once six years passed. The Court rejected that approach and held that a claim does not accrue until the challenger is actually injured. A business that didn’t exist when a regulation was issued, or one that only recently became subject to it, can sue based on when it was first harmed.8Supreme Court of the United States. Corner Post, Inc. v. Board of Governors of the Federal Reserve System Combined with Loper Bright, regulations once considered settled may now face fresh challenges from new parties under a standard that no longer favors the agency.
How Loper Bright Relates to the Major Questions Doctrine
Loper Bright is not the only limit on agency authority. The major questions doctrine, established in the Court’s 2022 decision in West Virginia v. EPA, requires agencies to show “clear congressional authorization” when they claim authority over matters of vast economic and political significance.9Supreme Court of the United States. West Virginia v. EPA Under that doctrine, an agency cannot rely on vague or ancillary statutory language to justify sweeping regulatory programs that reshape entire industries.
The two doctrines are distinct but complementary. Loper Bright governs everyday statutory interpretation: when an agency reads a statute one way and a challenger reads it another, the court must independently find the best reading. The major questions doctrine is a higher bar that applies only to extraordinary assertions of agency power, and it requires an unmistakably clear grant of authority rather than a plausible reading. Courts have confirmed that Loper Bright did not alter the major questions doctrine; the two frameworks operate independently.
The Dissent’s Objection
Justice Kagan, joined by Justices Sotomayor and Jackson, wrote a sharp dissent. She argued that many regulatory questions involve scientific, technical, or policy judgments that courts are poorly equipped to make. Agencies report to a president who answers to voters; judges have no such accountability and “no proper basis for making policy.”1Supreme Court of the United States. Loper Bright Enterprises et al. v. Raimondo, Secretary of Commerce, et al.
Kagan characterized the decision as replacing “a rule of judicial humility” with “a rule of judicial hubris,” giving courts exclusive power over every open interpretive question in regulatory law regardless of how technical or policy-laden. She noted that Congress and agencies alike had relied on Chevron for 40 years when writing statutes and issuing rules, and warned that overturning it would cast doubt across the federal regulatory landscape.
The Case That Produced the Ruling
The dispute began with a 2020 rule from the National Marine Fisheries Service requiring certain Atlantic herring vessels to carry third-party monitors onboard. Instead of the government paying for the monitors, the agency required the fishing companies themselves to cover the cost, estimated at $710 per day.10Federal Register. Magnuson-Stevens Fishery Conservation and Management Act Provisions; Fisheries of the Northeastern United States; Industry-Funded Monitoring
The companies argued that the Magnuson-Stevens Fishery Conservation and Management Act did not give the agency authority to impose that cost. The statute allows fishery management plans to require observers on vessels but says nothing about forcing vessel owners to pay observer salaries for this particular fishery.11Office of the Law Revision Counsel. 16 USC 1853 – Contents of Fishery Management Plans Lower courts sided with the government by applying Chevron deference. The Supreme Court took the case along with a companion case, Relentless, Inc. v. Department of Commerce, raising the same question from the First Circuit. After the ruling, NOAA Fisheries moved to rescind the industry-funded monitoring requirements. A dispute over $710-a-day fees ended up reshaping how the entire federal government interprets the law.
Where Things Stand
Courts have begun applying the new standard to a range of federal regulatory disputes. The Eighth Circuit invalidated an IRS transfer pricing regulation in a case signaling more rigorous judicial review of tax rules. Challenges are proceeding against EPA rules designating certain chemicals as hazardous substances, and courts are reconsidering the scope of judicial review over agency settlements in contamination cases.
The immediate disruption has been more measured than some early predictions suggested. Many agency rules rest on clear statutory authority and would survive independent judicial review. The rules most vulnerable are those that depended on aggressive readings of ambiguous statutory language, particularly where the agency stretched a statute to cover something Congress likely didn’t contemplate. The structural shift is unmistakable: federal agencies can no longer treat statutory ambiguity as a blank check, and anyone regulated by the federal government now has a fairer shot at persuading a judge that the agency got the law wrong.