On August 26, 2025, I gave a talk to a Houston tax group, the Wednesday Tax Forum. The paper I circulated was a high-level summary of a longer article that I have submitted for publication in the ABA Tax Lawyer in Spring 2024; the submitted article addresses the tax implications of Loper Bright Enterprises v. Raimondo, 603 U.S. 369, 377-378 (2024), see Preliminary Print here. I link that summary here so that readers may download if they wish. Note that the linked summary is redlined to show changes that I made shortly after giving the talk. I will not attempt to further summarize the arguments.
I address in this blog entry the overarching claim that I make. The domain of Chevron was a state of ambiguity where the court was not able to determine whether the agency interpretation or an opposing interpretation was the best interpretation. I call that state interpretive equipoise to relate it to the more familiar concept of factual equipoise where a factfinder is unable to determine whether a critical fact exists or not. In a state of factual equipoise, the factfinder resolves the issue by holding against the party bearing the burden of persuasion on that fact. In a state of interpretive equipoise, the court cannot find that either the agency interpretation or the opposing interpretation is the best interpretation. Chevron resolved the case in that state of interpretive equipoise, effectively placing on the opponent of the agency interpretation a burden to persuade the court that its opposing interpretation was “best.”
Why did Chevron tilt in favor of the agency interpretation in a state of interpretive equipoise? First consider the alternatives. Would it be acceptable for courts to decide in equipoise by flipping a coin, consulting a ouija board or soothsayer, or some other unprincipled way of resolving the ambiguity? Of course, that would not be acceptable. Still, courts must resolve interpretive issues in equipoise in some way. Chevron offered that way. I will address below why that is a principled resolution based on the APA, but I ask first what Loper Bright offered in lieu of Chevron to resolve cases of interpretive equipoise?
Loper Bright offers nothing for interpretive equipoise other than the ill-considered notion that courts can always interpret out all ambiguity to derive the single best interpretation. That would be nice if it made logical sense or experiential sense. Courts have the same interpretive skills after Loper Bright that they had under Chevron where they were admonished by Chevron’s famous footnote 9 to use those skills to avoid ambiguity where possible. Nevertheless, in some cases, ambiguity remained. I submit that cases of ambiguity—interpretive equipoise—will remain under Loper Bright. Loper Bright offers no guidance on what a court does where, using its best interpretive skills in de novo review, ambiguity exists.
Traditional Skidmore will not solve the problem of interpretive equipoise. Traditional Skidmore simply requires courts to respect agency interpretations in determining the best interpretations. The phenomenon I address here is where, after using all of those tools of interpretation (including Skidmore), the court cannot determine, as between the agency interpretation and the opposing interpretation, which is the best interpretation. Both interpretations must be in play—that is reasonable within the scope of the statutory ambiguity—but neither is the best interpretation. In that state of play, Loper Bright offers no way to resolve the case.
Of course, I say traditional Skidmore. Skidmore has traditionally been called Skidmore deference even though it was not deference but simply a consideration in reaching the best interpretation. See Really, Skidmore "Deference?" (Federal Tax Procedure Blog 5/31/20; 2/14/21), here. It is possible that, post-Loper Bright, courts may reimagine Skidmore to fill some of the conceptual space on the spectrum between respect and deference, sort of more than respect but less than deference, if that is a possible thing, say deference “light.” I can’t offer anything meaningful on that possibility.