I have thrashed around on this blog about the APA distinction between legislative and interpretive rules, focusing principally on regulations. Briefly, the key points I have asserted in the blogs and elsewhere are:
• The APA distinction between legislative and interpretive regulations continues to be viable despite claims from some scholarly quarters that they are not.
• The distinction between the two categories is: Legislative rules (must be by regulation) are like statutes; they are the law; they do not interpret the law. Interpretive rules (can be by regulation) are not the law but are interpretations of the law (here the statute).
• A legislative regulation like the consolidated return regulations authorized by specific delegation under § 1502 is the law just as if it were a statute. A legislative regulation does not interpret the statute.
• An interpretive regulation does interpret the statute. Interpretations of statute can be tested for the reasonableness of the interpretation. That is what Chevron does in the context of agency interpretations in interpretive regulations.
• An agency may adopt interpretive rules, at its choice in the form of notice and comment regulations, pursuant to the authority in “general authority” statutes (such as § 7805 of the IRC) or implied authority in the agency’s formative legislation.
• For example, § 482 which shares a provenance with § 1502 under the Revenue Act of 1928 when the prior version of the two statutes were split, with the 1928 predecessor of § 1502 conferring express delegated authority to Treasury to make the law in statute-like legislative regulations and the 1928 predecessor of § 482 not having that authority. Can you imagine the howls from scholars, the practitioner community and the courts if the IRS asserted the authority to make legislative rules like the consolidated return rules under § 482 via its general authority in § 7805?
• Adopting interpretive rules in notice and comment format does not make the interpretive rule legislative for purposes of the APA distinction.
• Legislative rules (must be by regulation) are not entitled to Chevron deference because legislative rules are the law and are not interpretations of the law. Chevron only tests reasonableness of interpretation against the text of a statute. Chevron cannot test the reasonableness of either a statute or a legislative regulation (said to be statute-like). Chevron can and does test interpretations in interpretive regulations to determine if the interpretations are reasonable within the scope of the statutory ambiguity.
Some, perhaps many, of these claims are not mainstream. For example, some claim that Chevron applies only to legislative regulations. This claim could be partially truth if their further claim that the legislative regulations category has taken over the interpretive regulation category, so that all notice and comment regulations are legislative even if all they do is to reasonably interpret ambiguous statutory text. It is my claim that the interpretive regulation category continues viable (has not been taken over by the legislative regulation category) and that Chevron deference applies to interpretive regulations and does not apply to legislative regulations.