I have argued in various postings on this blog that:
1. Chevron means that, for ambiguous statutory text, the court may apply reasonable agency regulations interpretations. (Please note that in this opening statement I do not call Chevron a deference regime.) Further, reasonable agency interpretations include (i) interpretations that are the better interpretation of the statute (by definition a reasonable interpretation) and (ii) interpretations that are not the better interpretation of the statute but still reasonable (whatever that means). Finally, based on my anecdotal but I think representative review of the cases where courts of appeals invoke Chevron to apply the reasonable agency interpretation but do not declare which of the subcategories the agency reasonable interpretation falls into, most of the time the court is at category (i) which is not deference. If that is right (I think it is), courts are not deferring to the agency interpretation in subcategory (i). Chevron deference applies only in subcategory (ii).
a. Chevron deference generally applies only to regulations promulgated with notice and comment. For this discussion, I assume that the Chevron-qualified notice and comment regulations were properly promulgated (i.e., no foot-faults in the procedures to promulgate notice and comment regulations).
2. Skidmore is not deference, because it does not permit a court to adopt an agency interpretation that is not the better of the possible reasonable interpretations. Rather, Skidmore only requires consideration of the agency interpretation in determining the better interpretation of the statute. Skidmore does not require or even permit the court to defer to an agency interpretation that is not persuasive as the better reading of the statute. Skidmore is not even weak deference, as often claimed. Hence careful judges and scholars avoid referring to Skidmore as a deference authority. Even Justices when discussing Skidmore recently have noted that Skidmore is not deference. See Really, Skidmore "Deference?" (Federal Tax Procedure Blog 5/31/20; 2/14/21), here, where I quote the Justices’ discussion in oral argument in Kisor v. Wilkie, 588 U.S. ___, 139 S.Ct. 2400 (2019), with a link to the transcript of and local page citations to the oral argument.
a. Skidmore respect generally applies only to subregulatory agency interpretations not entitled to Chevron deference. (I use the term subregulatory guidance as agency guidance other than in a procedurally properly promulgated notice and comment regulation.) However, logically, Skidmore respect can apply at Chevron Step One if the agency interpretation is determined the better interpretation, thus pre-empting Chevron Step Two which is the only step in the Chevron Framework where a court can defer to an agency interpretation. (Caveat: my anecdotal reading of the cases and inferences therefrom is that courts rarely invoke Skidmore at Chevron Step One but probably do some type of Skidmore-type analysis without naming it at Step Two where they determine the agency regulation interpretation is reasonable and thus seem to defer (of course, the better interpretation is reasonable and needs no deference; I’ll come back to this later.)
b. I noted that Skidmore can apply at Chevron Step One. It may also apply before the Chevron Framework is invoked--i.e. before Step One. If the agency interpretation is the better interpretation of the statute, it might even resolve ambiguity which is the predicate to the Chevron Framework.
I now extend those arguments.