A federal agency gets its authority from statutes enacted by Congress. Those laws establish the agency’s powers and responsibilities, setting the boundaries within which it may act.
That boundary matters: an agency cannot treat its mission as permission to do anything it considers useful. To understand what a federal agency can require, regulate or enforce, start with the statutes that created it or assigned it specific duties—and with the limits Congress placed in those laws.
| Question | What to check | Legal significance |
|---|---|---|
| What gives the agency power? | The statute enacted by Congress | Source of rulemaking authority |
| Was discretion delegated? | The statute’s text and scope | May permit administrative choices |
| Is the rule within the grant? | The rule compared with the statute | Courts use independent judgment |
| Does federal law preempt state law? | 5 U.S.C. § 601(a) conditions | Requires the specified statutory basis |
| Can a modest adjustment become a transformation? | Biden v. Nebraska (2023) summary | The summary distinguishes adjustment from transformation |
- 1 Primary source of agency rulemaking authority identified here: statutes enacted by Congress.
- 2 Core questions in review: what the statute means and whether the agency acted within its authority.
- 3 Preemption conditions named in 5 U.S.C. § 601(a): express provision, other clear evidence of congressional intent, or the stated statutory condition concerning state-law exercise.
Where does a federal agency get its authority to regulate?
Federal agencies get authority to issue regulations from statutes enacted by Congress. The Federal Register’s A Guide to the Rulemaking Process identifies those statutes as the source of an agency’s rulemaking power: an agency does not create its own legal mandate simply by publishing a regulation.
Start with the statute
For a particular regulation, the statute it administers is the first place to check what Congress authorized. A statute may give an agency discretion in carrying out its requirements, but that discretion remains bounded by the law; it does not amount to general authority to regulate beyond the statute’s scope.
Then examine the regulation
The regulation must fit within the authority the statute grants. That test matters when a rule’s reach is disputed: courts must use their independent judgment to decide whether an agency acted within its statutory authority, rather than defer to the agency’s interpretation merely because the statute is unclear. The practical check is to compare the rule’s requirements with the statute’s text and the authority Congress gave the agency.
How does Congress delegate discretion to an agency?
A federal statute delegates discretion when Congress authorizes an agency to choose among permissible ways of administering that law. The Congressional Research Service’s An Introduction to Judicial Review of Federal Agency Action explains that, in some cases, the statute’s best reading is that Congress intended to give an agency that room to decide.
Discretion has a statutory boundary
That authority is tied to the statute being administered: it allows an agency to make choices the law leaves open, not to claim a general power to rewrite the law. The distinction is between selecting an authorized way to carry out a statutory requirement and taking an action the statute does not permit.
Courts determine whether an agency has stayed within that boundary by exercising independent judgment about the statute’s meaning. The end of Chevron deference means ambiguity alone does not require a court to accept an agency’s interpretation; it does not erase discretion Congress actually delegated.
How do courts decide whether agency action exceeds statutory authority?
Courts decide whether federal agency action exceeds statutory authority by independently interpreting the statute and checking whether the action fits the authority Congress granted. The Administrative Procedure Act (APA) is relevant to that judicial review; the KFF summary describes independent judgment as part of the Supreme Court’s reasoning.
Interpret the law independently
The Supreme Court’s rejection of the Chevron doctrine means a court cannot treat statutory ambiguity, by itself, as a reason to accept an agency’s interpretation. Instead, the court must determine the statute’s meaning for itself, then assess the agency action against that meaning.
Check the limits of the grant
Independent judgment does not erase discretion that Congress actually delegated. The court must distinguish between an agency choosing how to exercise discretion the statute grants and an agency claiming power the statute does not provide.
- Delegated discretion: The court can recognize authority Congress assigned to an agency to administer a statute.
- Statutory boundary: The agency’s action must remain within the grant; ambiguity alone does not expand it.
What limits an agency’s authority beyond the statute’s subject?
An agency’s authority is limited by the text and scope of the statute Congress enacted: it may regulate only within the powers that law grants, and a regulation cannot expand those powers on its own. In Biden v. Nebraska (2023), the Supreme Court described statutory authority to modify provisions as permitting modest adjustments and additions, not transformations of existing provisions.
Preemption is a separate statutory limit
Under 5 U.S.C. § 601(a), an agency should construe a federal statute to preempt state law only if the statute expressly says so, other clear evidence shows Congress intended preemption, or the relevant state-law exercise is otherwise covered by the provision. That rule makes the statutory basis—not the agency’s preference—the test for whether federal law displaces state law.
A federal agency’s regulation does not, by itself, establish that Congress displaced state law. The agency must point to a statutory provision that supports the regulation and satisfies the preemption standard in 5 U.S.C. § 601(a); a rule that reaches beyond the statute’s subject or scope cannot supply the missing congressional authorization.
When does agency authority not extend as far as a rule claims?
A federal agency’s rule exceeds its authority when the statute enacted by Congress does not authorize the power the rule asserts. Courts must use their own judgment to decide what a federal statute permits; ambiguity alone does not require accepting the agency’s interpretation now that Chevron has been overruled.
Authority is not the same as expertise.
An agency’s knowledge of a regulated field, or its responsibility for administering a law, cannot replace a statutory grant of power. The relevant question is whether Congress’s statute gives the agency discretion over the specific matter the rule addresses—not whether the agency considers its approach useful or technically informed.
- Express discretion: A statute may authorize an agency to exercise discretion in administering the law. The scope of that authority depends on what Congress actually delegated.
- Ambiguity alone: Unclear wording does not itself expand an agency’s powers or settle the statute’s meaning in the agency’s favor.
- Modest adjustments: Authority to modify an existing provision may permit limited changes, but it does not automatically authorize a fundamental transformation. The Supreme Court’s 2022 decision in American Hospital Association v. Becerra is one concrete example of a case involving limits on modification authority.
How can a reader trace a regulation back to its legal authority?
A practical reading sequence
To trace a federal regulation to its legal authority, identify the statute it administers, then compare the regulation’s asserted power with the statute’s text and any discretion Congress expressly delegated. That sequence separates the legal basis for a rule from its practical consequences.
- Find the statute. Federal agencies derive regulatory authority from laws enacted by Congress. Read the cited statute first to see what activity it covers and what authority it gives the agency.
- Test the claimed power. Compare the rule’s requirements with the statute’s language. A statute may explicitly give an agency discretion in administering it, but that does not itself establish authority to go beyond the statutory scope.
- Separate policy from interpretation. An agency may choose among options Congress left open; whether the statute actually authorizes the rule is a question for a court to decide independently. The Supreme Court has overruled Chevron deference, so statutory ambiguity alone does not require a court to accept the agency’s interpretation.
- Check preemption separately. For a claim that a federal regulation displaces state law, 5 U.S.C. § 601(a) calls for an express preemption provision or other clear evidence that Congress intended preemption. A regulation’s practical effect on state rules is not a substitute for that inquiry.
This reading sequence keeps three questions distinct: what Congress authorized, how the agency exercised any delegated discretion, and whether Congress intended federal law to displace state law.
Frequently asked questions
Where does a federal agency get authority to issue regulations?
Does a statute’s ambiguity automatically give an agency the final say?
Can Congress give an agency discretion?
Can an agency use its authority to transform a statute?
Does an agency regulation automatically preempt state law?
Key takeaways
- Congressional statutes are the source of federal agencies’ rulemaking authority.
- A statute can delegate administrative discretion without granting unlimited power.
- Courts independently interpret statutes after Chevron was overruled.
- Biden v. Nebraska (2023) is described as distinguishing modest adjustments from transformation.
- 5 U.S.C. § 601(a) sets conditions relevant to construing federal preemption of state law.
Sources
- Library of Congress — “An Introduction to Judicial Review of Federal Agency Action | Congress.gov”
- uscode.house.gov — “5 USC 601: Definitions”
- KFF — “Supreme Court Decision Limiting the Authority of Federal Agencies Could Have Far-Reaching Impacts for Health Policy”
- uploads.federalregister.gov — “A Guide to the Rulemaking Process”
- supreme.justia.com — “Government Agencies Supreme Court Cases”
