I recently updated a post on Corner Post. See Does Corner Post Permit § 2401(a)’s 6-year Statute of Limitation to Apply from Date of Regulation for Procedural Challenges? (Federal Tax Procedure Blog 7/10/24; 7/11/24), here. In the update (in red), I argued that the Corner Post holding was meaningless because Loper Bright compels that the best interpretation controls whether or not incorporated in a regulation (previously required for deference) and whether or not such a regulation was procedurally or substantively valid. So, whenever a court adjudicates, the best interpretation should now be applied from the effective date of the enacted statute.
One consequence of that for tax is that § 7805(b), here, is rendered meaningless unless, as I note here, there is a continuing role for deference. A reminder on what § 7805(b) does. From my Federal Tax Procedure Book 71 (2023.2 Practitioner Edition) (footnotes omitted and emphasis supplied), here:
(1) if issued within 18 months of the date of the statute, then to “the date of the enactment” of the statute;
(2) if issued later than 18 months, then the earliest of the following dates: (a) the date the final regulation was published; (b) the date on which any Proposed or Temporary Regulation was published; and (c) the date on which any notice substantially describes the contents of the expected Proposed, Temporary or Final Regulation;
(3) if necessary “to prevent abuse,” with no limitation as to the date of retroactivity;
(4) “to correct a procedural defect in the issuance of any prior regulation,” with no indication as to the date of retroactivity;
(5) if “relating to internal Treasury Department policies, practices, or procedures,” with no limitation as to the date of retroactivity.
These are limitations on the regulations but not the interpretation. If the [Treasury] interpretation is the best interpretation of the statutory text, then perforce the interpretation will apply from the effective date of the statute (whether or not the interpretation is in a regulation). In other words, if the IRS [Treasury] were to include the interpretation in a regulation which violated the time limitations, that would not invalidate the interpretation or prevent the interpretation from applying from the effective date of the statute; it would just invalidate the regulation.