A question raised by the demise of deference pronounced in Loper Bright Enterprises v. Raimondo, 603 U. S. ____, 144 S. Ct. 2244 (2024) is the continuing viability or application of Auer/Kisor deference. Recall that Auer/Kisor deference applied Chevron-type deference framework to agency subregulatory guidance interpreting ambiguity in agency regulations. Loper Bright did not speak to the continuing viability of Auer/Kisor deference. The Loper Bright opinion of the Court cited Kisor for other propositions, but did not speak to whether Auer/Kisor was viable after Loper Bright.
Although Loper Bright did not speak directly to the continuing viability of Auer/Kisor deference, I think that the inevitable logic of Loper Bright pronounces the demise of Auer/Kisor deference. Of course, because the Supreme Court did not expressly overrule Auer/Kisor deference, some pundits and courts may still pay homage to it until and unless the Supreme Court speaks to its continuing viability. See e.g., Fourth Circuit Applies Auer/Kisor Deference to Include in Guidelines "Loss" the Commentary Inclusion of "Intended Loss" (Federal Tax Procedure Blog 8/24/24), here; and More on United States v. Boler (Federal Tax Procedure Blog 8/25/24), here.
However, a confident lower court reading Loper Bright as I do might be willing to step out on that issue by holding that Loper Bright is inconsistent with Auer/Kisor deference. Or, alternatively, as happened in Coplan, a Court of Appeals might signal in an opinion that there is a major conceptual problem that the Supreme Court should address. See Is It Too Much to Ask that the Defraud Conspiracy Crime Require Fraud? (Federal Tax Crimes Blog 8/3/24; 8/6/24), discussing United States v. Coplan, 703 F.3d 46 (2d Cir. 2012), cert. den. 571 U.S. 819 (2013).
Now, I will state why I think Auer/Kisor deference is not consistent with the demise of Chevron deference pronounced in Loper Bright.