Chevron Deference

What Chevron Deference Was

Chevron deference was a rule that told federal courts to defer to a government agency’s reasonable interpretation of an unclear law that the agency administers. If Congress wrote an ambiguous statute, judges were supposed to accept the agency’s reasonable reading rather than substitute their own. The Supreme Court created the rule in 1984 and overruled it in 2024, so courts now decide for themselves what an ambiguous federal law means.

The practical meaning was that on unclear laws, the expert agency, not the judge, usually had the last word. A specialist at the EPA who read an ambiguous clean-air statute one reasonable way would win, even if the judge would have read it another way. That is what changed in 2024.

How the Two-Step Test Worked

Under Chevron, a court reached the question of deference only after it decided Congress had left a gap. First the court asked whether the statute answered the question in plain text. Only if the text was genuinely unclear did the court move to the second question, where the agency usually won.

How a court reviewed an agency's reading of a law under Chevron, 1984-2024

1. 1 Step one Is the statute clear? If Congress directly answered the question, its words control and the case ends there.
2. 2 Step two If not, is the agency reasonable? The court asks only whether the agency picked a permissible reading, not the best one.
3. 3 Result The agency reading stands The court defers even if it would have read the law differently.

Source: Chevron v. NRDC (1984); Cornell LII.

That second step is where most of the fights happened, because “reasonable” let agencies fill gaps Congress left. Over time the Court added limits. Mead (2001) added a threshold question, later called “Step Zero”: deference applied only when Congress had given the agency power to act with the force of law and the agency used it. The major questions doctrine from West Virginia v. EPA (2022) carved out agency decisions of “vast economic and political significance,” which courts would not let an agency claim from a vague statute. The weaker fallback was Skidmore deference (1944), which gave an agency’s view only the weight of its “power to persuade.”

Chevron Reached Nearly Every Federal Agency

One ruling moved power across the whole government, because every agency that writes binding rules had worked under Chevron.

Justice Kagan’s Loper Bright dissent called Chevron “as embedded as embedded gets in the law,” and her examples ran from FDA rules on biological products to Medicare payments to hospitals. The FCC’s net neutrality rules show how far the room stretched: the agency classified broadband one way, then the other, then back again under the same 1934 statute, and courts upheld both readings as reasonable.

How the Doctrine Was Made and Unmade

The arc runs from a 1984 decision that created the two-step test, through Mead in 2001 and Massachusetts v. EPA in 2007, the King v. Burwell sidestep in 2015, the major questions doctrine crystallized in West Virginia v. EPA in 2022, to Loper Bright overruling Chevron in 2024 and Corner Post restarting the challenge clock that same summer.

1. 1984 Chevron creates the test Justice Stevens writes a 6-0 opinion (three justices not participating) upholding an EPA clean-air rule and setting up the two-step test.
2. 2001 Mead adds Step Zero The Court limits Chevron to agency action taken with power to act with the force of law.
3. 2007 Court rejects EPA's reading Massachusetts v. EPA holds greenhouse gases fit the Clean Air Act's definition of an air pollutant.
4. 2015 King v. Burwell sidesteps On a question of deep economic and political significance, the Court reads the statute itself instead of deferring.
5. 2022 Major questions doctrine West Virginia v. EPA carves out decisions of vast economic and political significance.
6. 2024 Loper Bright overrules Chevron The Court ends Chevron 6-3 and puts statutory interpretation back with judges.
7. 2024 Corner Post restarts the clock The six-year challenge clock runs from a plaintiff injury, reopening old rules.

Sources: Justia; supremecourt.gov; CRS R44954.

From the 1984 two-step test to the 2024 overruling: 1984: Chevron creates the test (Justice Stevens writes a 6-0 opinion (three justices not participating) upholding an EPA clean-air rule and setting up the two-step test.). 2001: Mead adds Step Zero (The Court limits Chevron to agency action taken with power to act with the force of law.). 2007: Court rejects EPA's reading (Massachusetts v. EPA holds greenhouse gases fit the Clean Air Act's definition of an air pollutant.). 2015: King v. Burwell sidesteps (On a question of deep economic and political significance, the Court reads the statute itself instead of deferring.). 2022: Major questions doctrine (West Virginia v. EPA carves out decisions of vast economic and political significance.). 2024: Loper Bright overrules Chevron (The Court ends Chevron 6-3 and puts statutory interpretation back with judges.). 2024: Corner Post restarts the clock (The six-year challenge clock runs from a plaintiff injury, reopening old rules.).

1984: Justice Stevens wrote the opinion in Chevron v. NRDC for a bare quorum of six justices, upholding an EPA “bubble” rule under the Clean Air Act and creating the two-step test.

2001: In United States v. Mead Corp. the Court added the threshold later called “Step Zero,” holding that Chevron applied only when Congress gave the agency power to make rules carrying the force of law and the agency used that power.

2007: In Massachusetts v. EPA the Court held that greenhouse gases fit the Clean Air Act’s definition of an air pollutant, rejecting EPA’s view that it lacked authority to regulate them.

2015: In King v. Burwell the Court sidestepped Chevron on an Affordable Care Act question of deep “economic and political significance,” reasoning that Congress would have assigned it to an agency expressly.

2022: In West Virginia v. EPA the Court crystallized the major questions doctrine, holding that agencies need clear congressional authorization for decisions of vast economic and political significance.

2024: In Loper Bright v. Raimondo the Court overruled Chevron, holding that the Administrative Procedure Act requires judges to use their own judgment on what a law means. Justices Thomas and Gorsuch, who had questioned Chevron in earlier opinions, each wrote separately.

2024: In Corner Post v. Board of Governors the Court held the six-year clock to challenge a rule runs from when a plaintiff is first injured. Justice Jackson’s dissent warned that this makes challenges to “decades-old agency decisions fair game.”

What Loper Bright Decided

The case that ended Chevron started with herring fishermen, not a sweeping legal theory. A group of Atlantic herring fishermen, including the family business Loper Bright Enterprises, challenged a National Marine Fisheries Service rule that made them pay for the at-sea monitors riding on their own boats.

By the agency’s own estimate, a monitor would cost up to $710 a day and cut a vessel owner’s annual returns by up to 20%. The fishermen argued the agency had no clear authority to make them pay. The Supreme Court used their case to decide a much larger question about who interprets unclear law.

On June 28, 2024, Chief Justice Roberts wrote for a 6-3 majority across the two cases that overruled Chevron. The Court held that the Administrative Procedure Act requires judges to “decide all relevant questions of law” and exercise independent judgment, and it leaned on Marbury v. Madison for the principle that interpretation is the judiciary’s duty. Justice Jackson was recused from Loper Bright, so that case was decided 6-2, and she joined the dissent in the companion case, Relentless, Inc. v. Department of Commerce.

It is emphatically the province and duty of the judicial department to say what the law is.

Marbury v. Madison, quoted by Chief Justice John Roberts in Loper Bright v. Raimondo, 2024

What replaced Chevron is a search for the single best reading of the statute. The court does that work itself and treats the agency’s view as one argument among others.

How a court reviews an agency's reading of a law after Loper Bright, 2024 onward

1. 1 First Did Congress delegate? If the statute gives the agency discretion, such as to define a term, the court checks only that the agency stayed inside it.
2. 2 If not The court finds the best reading The judge reads the text with ordinary legal tools. Ambiguity no longer tips the case to the agency.
3. 3 Weight The agency view may persuade Under Skidmore, a careful, consistent agency reading can carry weight. It cannot control.

Source: Loper Bright v. Raimondo (2024), slip opinion.

The Court kept its old rulings in place. Prior cases that upheld a specific agency action under Chevron, including the Clean Air Act holding in Chevron itself, still stand as precedent. Three days later, Corner Post changed who could sue and when.

That ruling means a newly formed or newly affected business can now challenge a rule that has been on the books for decades, because the clock starts when the plaintiff is first injured rather than when the rule was issued.

Rulings Since 2024 Struck Some Rules and Kept Others

Courts have struck agency rules when the agency’s reading stretched the statute, and kept them when Congress wrote in discretion or deference. The table lists the landmark rulings through September 2026. It leaves out hundreds of lower-court decisions that cite Loper Bright, because no neutral tracker counts them by outcome.

Tipped workers: The Fifth Circuit threw out the Labor Department’s limit on how much side work a tipped worker could do while the employer still paid the lower tipped wage (Littler summary of the ruling).

Overtime: Citing Loper Bright, Judge Sean Jordan ruled that the 2024 overtime rule made “salary predominate over duties for millions of employees,” beyond the department’s authority (Proskauer).

Net neutrality: The Sixth Circuit said that without deference, the FCC could no longer choose between two readings of the Communications Act, and it picked the lighter one (CRS). The net neutrality explainer covers what those rules did and which states still enforce their own.

Ghost guns: In Bondi v. VanDerStok, the Court upheld the ATF rule against a facial challenge by reading the Gun Control Act itself (opinion). An agency can still win after Loper Bright when its reading is the best one.

Asylum: In Urias-Orellana v. Bondi, a unanimous Court said Loper Bright “is not applicable” when a statute itself calls for deferential review (opinion).

How the White House Uses Loper Bright

The Trump administration has made Loper Bright a main tool for repealing rules. Everything in this section is agency action or a proposal, not law passed by Congress.

Executive Order 14219, signed February 19, 2025, directed agencies to list several kinds of regulations, including those based on “anything other than the best reading” of the statute (Federal Register). An April 9, 2025, memo named ten Supreme Court rulings, Loper Bright first, and told agencies to repeal rules that conflict with them. Where the “good cause” exception allows it, the memo said, agencies should skip public notice and comment (White House).

Two final rules in July 2026 show the method. On July 14, the Fish and Wildlife Service and NOAA Fisheries rescinded the definition of “harm” under the Endangered Species Act. That definition counted significant habitat modification that actually kills or injures wildlife as harm, and the Supreme Court had upheld it under Chevron in Babbitt v. Sweet Home (1995). On July 24, the Education Department cut the disparate-impact portions of its Title VI rules, which had let the department act against school policies that fall hardest on one race or national origin, without proof of intent. Both rules cite Loper Bright to argue that the statute has one “best” meaning and the old regulation went past it.

The same standard runs in both directions. A repeal like these also rests on a reading of the statute, and after Loper Bright a court, not the agency, decides whether that reading is the best one. EPA’s 2026 repeal of the greenhouse gas endangerment finding is a test of exactly that, because the agency rests it on its own “best reading” of the Clean Air Act. A separate 2026 ruling concerned the president’s control of agencies. In Trump v. Slaughter (June 29, 2026), the Court ruled 6-3 that the law letting a president remove Federal Trade Commission members only for cause is unconstitutional, and it overruled what was left of Humphrey’s Executor (1935) (opinion).

Congress has two opposite bills on the table, and both are proposals.

• Separation of Powers Restoration Act (H.R. 1605, S. 33). It would write de novo review into law and extend it to agencies’ readings of their own rules. The House Judiciary Committee approved it 15-12 on May 21, 2025. No floor vote has followed (GovTrack).
• Stop Corporate Capture Act. It would restore Chevron-style deference by statute. It was last introduced in the 118th Congress (H.R. 1507 in 2023, S. 4749 in 2024), and we found no version in the current Congress (govinfo).

What Loper Bright Did Not Change

The shift is real, but it is narrower than the headlines suggested. Judges now have the last word on what an unclear law means. Several kinds of deference survived.

• Fact-finding and technical judgment. Arbitrary-and-capricious review under the State Farm standard still asks only whether the agency reasoned carefully. In Seven County (2025) the Court told judges to give agencies “substantial deference” on how deep an environmental review should go.
• Deference Congress writes in. When a statute tells courts to defer, or hands an agency the power to define a term, courts follow the statute (Urias-Orellana, 2026).
• Agency readings of their own rules. Loper Bright addressed statutes. Deference to an agency’s reading of its own regulation, narrowed in Kisor v. Wilkie (2019), was not before the Court. The Separation of Powers Restoration Act would end it.
• Old rulings. Cases decided under Chevron keep their force as precedent, though Corner Post lets new plaintiffs attack the underlying rules.

The Honest Disagreement

Serious people disagreed about whether Chevron should have survived, and the disagreement is worth stating fairly. The two sides split over a single question: who should resolve a genuine ambiguity in the law, the expert agency or the court.

The case for deference came from Justice Kagan’s dissent. It argued that agencies have expertise on scientific and technical questions that courts lack, that agencies report to a president who answers to the public while judges do not, and that Congress knows it cannot write perfectly complete laws and would usually prefer the agency, not a court, to fill the gaps. Kagan called the majority’s move a shift from a rule of judicial humility to one of judicial hubris.

A rule of judicial humility gives way to a rule of judicial hubris.

Justice Elena Kagan, dissenting in Loper Bright v. Raimondo, 2024

The case against Chevron came from the Loper Bright majority, Justices Gorsuch and Thomas, and the scholar Philip Hamburger. They argued that Article III and Marbury make saying what the law is the courts’ job, that the Administrative Procedure Act tells courts to decide all relevant questions of law themselves, and that deference let agencies flip their readings between administrations and tilted close cases toward the government.

The two years since have given each side evidence. Net neutrality’s end fits the majority’s complaint about readings that flipped with each administration. The Texas overtime ruling, which erased a raise in the salary line for millions of workers, fits the dissent’s warning that judges would override expert policy calls. Deference on scientific fact-finding stays strong, while deference on pure legal interpretation ended. We do not declare a winner on these close calls.

Frequently Asked Questions

Is Chevron deference still law?

No. The Supreme Court overruled it in Loper Bright v. Raimondo on June 28, 2024.

Does this mean agencies get no deference at all?

Not quite. Courts decide legal questions themselves, but they may still credit an agency’s view under Skidmore when it persuades, and they still defer to agency fact-finding under arbitrary-and-capricious review.

Are old regulations now void?

No. Prior rulings that relied on Chevron still stand. But Corner Post lets newly injured parties challenge old rules going forward.

Does Loper Bright apply when an agency repeals a rule?

Yes, when the repeal rests on the agency’s reading of the statute, as the April 2025 White House repeal memo directs. Loper Bright tells courts to decide for themselves whether an agency stayed within its statutory authority. A repeal that skips public comment can also be challenged under the Administrative Procedure Act, which requires notice and comment unless an exception such as good cause applies.

Is Chevron deference connected to the Chevron oil company's Ecuador case?

No. The doctrine takes its name from Chevron U.S.A., a party to the 1984 Clean Air Act case. The long legal fight over oil pollution in Ecuador is a separate matter.

What You Can Do

1. Comment on proposed rules and repeals at Regulations.gov. A comment explaining how a rule affects you becomes part of the record a court reviews when the rule is challenged.

2. Ask your representative how they will vote on H.R. 1605, the Separation of Powers Restoration Act. It cleared the House Judiciary Committee in May 2025 and would end deference to agencies’ readings of their own rules too.

3. Track the rules that affect your paycheck and your health. Overtime, tipped-wage, net neutrality, and clean-air rules have all been relitigated since 2024. The executive orders explainer covers how agencies make policy, and the judicial review explainer covers the courts’ power to interpret law.

4. Send the letter below asking Congress to restore deference to agency experts on technical health and safety questions.