Auer deference is a federal administrative law doctrine that requires a court to accept an agency’s reasonable interpretation of its own ambiguous regulation instead of imposing the court’s own reading. It applies only when the regulation is genuinely ambiguous and the agency’s interpretation clears a demanding set of conditions set out by the Supreme Court in Kisor v. Wilkie (2019). With the Court’s 2024 decision overruling Chevron deference, Auer now stands as the last major deference doctrine in federal administrative law.
Where the Doctrine Comes From
The rule began with Bowles v. Seminole Rock & Sand Co. in 1945. The Supreme Court held that when a regulation’s meaning is in doubt, the agency’s own interpretation controls “unless it is plainly erroneous or inconsistent with the regulation.”1Justia. Bowles v. Seminole Rock and Sand Co., 325 U.S. 410 (1945)
The modern name comes from Auer v. Robbins in 1997. The case asked whether St. Louis police sergeants and lieutenants qualified as salaried employees exempt from overtime under the Fair Labor Standards Act. The Department of Labor’s regulation required pay on a “salary basis,” and the dispute turned on how to read the phrase “subject to” in that rule. The Court accepted the Secretary of Labor’s interpretation because it was not “plainly erroneous.”2Justia U.S. Supreme Court Center. Auer v. Robbins, 519 U.S. 452 (1997) From then on, courts and commentators called the Seminole Rock standard Auer deference.
The Kisor Test Courts Must Work Through
For over two decades, courts applied Auer loosely. If a regulation looked ambiguous and the agency’s reading was not plainly wrong, deference usually followed. The Supreme Court changed that in Kisor v. Wilkie, a 2019 decision about how the Department of Veterans Affairs read its own regulation on “relevant” records in a benefits claim. The Court kept Auer alive but made deference anything but automatic.
A court must first find genuine ambiguity. Before deferring, it has to exhaust the traditional tools of interpretation — text, structure, history, and purpose. If the court can resolve the meaning on its own, the inquiry ends and the agency gets nothing.3Justia. Kisor v. Wilkie, 588 U.S. (2019) This step alone eliminates many cases where deference used to be reflexive.
If real ambiguity survives, the agency’s interpretation still has to clear several more hurdles:
- It must fall “within the bounds of reasonable interpretation.” The Court was explicit that this is a genuine constraint, not a rubber stamp.3Justia. Kisor v. Wilkie, 588 U.S. (2019)
- It must be the agency’s authoritative position, not a stray remark from a low-level employee or an informal statement outside the agency’s established policymaking process.
- It must implicate the agency’s substantive expertise. When the dispute involves a generic legal question far from the agency’s technical domain, the case for deference weakens.
- It must reflect the agency’s fair and considered judgment. Courts must reject what the opinion called “convenient litigating positions” and “post hoc rationalizations advanced to defend past agency action.”4Supreme Court of the United States. Kisor v. Wilkie
The fair-and-considered-judgment requirement also blocks interpretations that create “unfair surprise” for regulated parties. If an agency reverses a longstanding reading and applies the new one to past conduct, courts will decline to defer. People and businesses that followed the earlier guidance should not be penalized for doing so.
What Happens When Auer Doesn’t Apply
When an interpretation fails the Kisor test, the agency’s view does not vanish from the case. Courts generally fall back on Skidmore deference, from the 1944 decision in Skidmore v. Swift & Co. Under Skidmore, the agency’s position is not binding; it carries whatever weight the court finds it deserves.5Justia. Skidmore v. Swift and Co., 323 U.S. 134 (1944)
Courts gauge persuasiveness by looking at how thoroughly the agency considered the question, whether its reasoning holds together, and whether it has stuck with the same interpretation over time. An agency that has studied the issue and applied a consistent reading for years will fare better than one offering a new theory mid-litigation. The practical difference is real. Under Auer, the court must accept any reasonable agency interpretation of a genuinely ambiguous rule. Under Skidmore, the court decides for itself and merely considers what the agency thinks.
Auer Deference Versus Chevron Deference
Auer is often confused with Chevron, but the two doctrines address different things. Auer applies when an agency interprets its own regulation. Chevron applied when an agency interpreted a statute passed by Congress that the agency was responsible for administering.6Congressional Research Service. Has Judicial Deference to Agency Regulatory Interpretations Reached Its Final Auer? The source of the text matters. A regulation is written by the same agency that later interprets it, which raises concerns about an agency serving as both author and judge of its own rules. A statute is written by Congress, making the agency a third-party interpreter.
Chevron no longer exists. On June 28, 2024, the Supreme Court overruled it in Loper Bright Enterprises v. Raimondo, holding that courts must exercise independent judgment when deciding whether an agency has acted within its statutory authority. Courts “may not defer to an agency interpretation of the law simply because a statute is ambiguous.”7Justia. Loper Bright Enterprises v. Raimondo, 603 U.S. (2024) Auer now stands alone as the surviving major deference doctrine in federal administrative law.
Why Auer Matters and Where It May Be Headed
The doctrine affects real disputes constantly. Agencies issue thousands of regulations, and the language inevitably admits more than one reading. When an agency publishes guidance saying what its regulation means, that interpretation can determine whether a business owes a fine, whether a veteran receives benefits, or whether a workplace safety rule reaches a particular industry. If a court defers, the agency’s view effectively becomes the law for that question.
Critics argue that letting agencies both write and interpret their rules rewards vagueness, because a loose regulation can later be “clarified” with judicial backing. Four justices in Kisor would have overruled Auer entirely, and the Court’s willingness to discard Chevron in 2024 has sharpened the question of whether Auer is next. The Kisor plurality grounded Auer in a different part of the Administrative Procedure Act than the provision addressed in Loper Bright, so the 2024 ruling does not clearly overrule it as a matter of reasoning.8Yale Journal on Regulation. Auer after Loper Bright, by Chad Squitieri Lower courts have continued to apply Auer under the Kisor framework. Whether the Supreme Court formally overrules the doctrine, lets it fade through strict application of Kisor, or leaves it in place remains one of the most watched questions in administrative law.