An advisory opinion is a formal interpretation of law issued by a court, agency, or government lawyer in response to a specific question, and whether it legally binds anyone depends entirely on who issued it and under what authority. Some advisory opinions carry no legal force at all. Others bind only the person who asked for them. A few create safe harbor protections that extend to anyone engaged in materially identical conduct. Treating all of them the same is how people end up exposed to liability they thought they had avoided.
Who Issues Advisory Opinions
Federal courts don’t. Article III of the U.S. Constitution limits them to actual cases and controversies, which rules out answering hypothetical questions or giving legal advice outside a live dispute.1Constitution Annotated. ArtIII.S2.C1.4.2 Advisory Opinion Doctrine The bodies that do issue advisory opinions fall into four main groups.
State Supreme Courts
About 11 state constitutions authorize the state’s highest court to issue advisory opinions to the governor, the legislature, or both.2Legal Information Institute. Advisory Opinion These let elected officials check the constitutionality of a proposed bill or executive action before committing to it.
State Attorneys General
Issuing legal opinions to government officials has been a core function of state AGs since the office was created. Agencies, legislators, governors, and local officials send legal questions to the AG every day, and formal written opinions answering those questions are typically published.3National Association of Attorneys General. Attorney General Opinions In a few states these opinions bind state agencies; in most, they are advisory only.
Federal Agencies
Several federal agencies issue advisory opinions within their regulatory areas. The FDA issues opinions that represent the agency’s formal position and obligate the FDA itself to follow that position until it is amended or revoked.4eCFR. 21 CFR 10.85 – Advisory Opinions The HHS Office of Inspector General issues opinions on whether proposed healthcare arrangements would violate the federal anti-kickback statute.5Office of Inspector General. Advisory Opinion Process The Federal Election Commission issues opinions on whether planned political activities comply with campaign finance law. The Office of Government Ethics advises federal employees on conflicts of interest and ethics rules. Each agency operates under its own statute, and the legal weight of each opinion varies.
The International Court of Justice
The ICJ issues advisory opinions when requested by the UN General Assembly, the Security Council, or other authorized UN organs and specialized agencies.6United Nations. Charter of the United Nations – Chapter XIV: The International Court of Justice These opinions do not bind the requesting body or any member state, but they shape international legal norms and are cited in treaty negotiations and domestic court decisions.
Is an Advisory Opinion Legally Binding?
The term covers a wide spectrum, from zero legal force to enforceable safe harbor protection. Three categories cover most situations.
Opinions That Bind the Requestor
HHS OIG advisory opinions are binding on the party that requested them. If you ask the OIG whether a proposed healthcare arrangement violates the anti-kickback statute and receive a favorable opinion, you can legally rely on that answer. Third parties cannot. The OIG publishes redacted versions for informational purposes, but someone who wasn’t part of the request cannot claim protection under someone else’s opinion.5Office of Inspector General. Advisory Opinion Process The statutory authority comes from HIPAA, which directed the Secretary of HHS to publish advisory opinions on anti-kickback and safe harbor provisions.7Office of the Law Revision Counsel. 42 U.S. Code 1320a-7d – Guidance Regarding Application of Health Care Fraud Statutes
Opinions That Create Safe Harbor Protections
Some advisory opinions extend protection to anyone engaged in materially identical activity. FEC opinions work this way. If the Commission approves a particular type of campaign finance activity, any person involved in activity “indistinguishable in all its material aspects” from what was approved receives legal protection, as long as they act in good faith.8FEC. The Advisory Opinion Process The Office of Government Ethics offers a similar shield: a federal employee who acts in good faith reliance on a formal OGE advisory opinion will not be prosecuted under the federal conflict-of-interest statutes or disciplined based on the legal authority cited in that opinion.9eCFR. 5 CFR 2638.209 – Formal Advisory Opinions
Opinions That Are Purely Advisory
State court advisory opinions and most attorney general opinions sit at the other end. A governor who receives an advisory opinion from the state supreme court isn’t legally required to follow it, though ignoring it carries political risk and can signal bad faith if the issue later reaches court. AG opinions in most states are not binding either, but courts tend to give them significant weight, especially when interpreting ambiguous statutes for the first time.3National Association of Attorneys General. Attorney General Opinions
Advisory Opinion vs. Declaratory Judgment
These get confused, and the difference matters when you’re deciding what to ask for. A declaratory judgment is a binding adjudication that conclusively establishes the rights and legal relations of the parties. It requires an actual controversy between real parties with adverse legal interests and “sufficient immediacy and reality” to justify judicial intervention. An advisory opinion addresses a hypothetical or prospective question without any live dispute.10Constitution Annotated. ArtIII.S2.C1.4.3 Advisory Opinions and Declaratory Judgments
The practical difference is enforceability. A declaratory judgment settles a contested issue “conclusively and finally” and differs from other judgments only in that it doesn’t order immediate relief like damages or an injunction. It can be appealed and can serve as the basis for further enforcement. An advisory opinion creates no judgment at all and resolves nothing between opposing parties. If you need a definitive ruling that other parties must respect, you need a declaratory judgment.10Constitution Annotated. ArtIII.S2.C1.4.3 Advisory Opinions and Declaratory Judgments
How Much Weight Courts Give Agency Advisory Opinions
For decades, courts gave significant deference to federal agency interpretations of ambiguous statutes under the Chevron framework. In 2024, the Supreme Court overruled Chevron in Loper Bright Enterprises v. Raimondo, holding that courts “must exercise their independent judgment in deciding whether an agency has acted within its statutory authority.” Courts can no longer automatically accept an agency’s reasonable reading of a statute just because the statute is ambiguous.
What replaced Chevron is essentially the older Skidmore standard, which treats agency interpretations as persuasive rather than controlling. Under Skidmore, a court deciding how much weight to give an agency advisory opinion considers the thoroughness of the agency’s analysis, the validity of its reasoning, its consistency with earlier positions, and the agency’s specialized expertise. A well-reasoned opinion from an experienced agency still carries real influence. A hastily drafted opinion, or one that contradicts the agency’s prior stance, gets far less.
If you’re relying on an agency advisory opinion, that reading must now earn its credibility on the merits in any court challenge. The opinion is still worth having. It’s no longer close to a guarantee that a court will see the law the same way the agency does.
What Happens If an Advisory Opinion Is Revoked
Agencies can amend or revoke their advisory opinions, and the consequences for people who relied on the old guidance vary. The FDA’s rules are relatively protective: action taken in conformity with an advisory opinion that is later amended or revoked remains acceptable unless the Commissioner specifically determines that “substantial public interest considerations” require otherwise. When possible, the FDA states in the amended or revoked opinion whether previously completed actions remain acceptable and whether any transition period applies.4eCFR. 21 CFR 10.85 – Advisory Opinions
Other agencies follow a similar general principle: an advisory opinion obligates the agency to follow it until formally changed, and the agency cannot typically penalize someone for conduct that complied with the opinion at the time. This isn’t universal. The safe harbor protections generally apply to conduct undertaken while the opinion was in effect, but the specifics depend on the statute and regulation governing each agency. If you’re operating under an advisory opinion, track whether it has been amended.
How to Request an Advisory Opinion
Procedures differ by agency, but a few requirements recur. Most agencies require that you be directly involved in the activity you’re asking about. The FEC lets anyone request an opinion as long as the requestor is personally affected by the question. You can’t ask about someone else’s activities, pose purely hypothetical questions, or submit general legal inquiries. The OIG limits requests to parties involved in an actual or proposed arrangement.
Build the timeline into your plans. The HHS OIG commits to an initial response within 10 business days of receiving a request, either accepting it, rejecting it, or requesting additional information.5Office of Inspector General. Advisory Opinion Process The final opinion can take significantly longer. FEC opinions have statutory deadlines tied to elections, and requests from candidates within 60 days of an election receive expedited treatment. For most agencies, expect to provide detailed documentation of the proposed arrangement and wait weeks or months for a response. If a transaction depends on a favorable opinion, don’t start the clock the week before you need the answer.