Administrative Procedure Act: Rulemaking, Review, and Remedies

The Administrative Procedure Act is the 1946 federal statute that sets the ground rules for how every federal agency writes regulations, resolves disputes, and defends its decisions in court. Codified primarily in Title 5 of the United States Code, it creates a baseline of transparency and fairness across the executive branch: agencies have to give notice before adopting binding rules, hold fair hearings when they apply those rules to specific people, and answer to federal judges when someone challenges what they did. A 2024 Supreme Court decision made that last piece considerably more powerful by ending judicial deference to agency readings of ambiguous statutes.

Which Federal Bodies the Law Applies To

The APA’s definition of “agency” is deliberately broad. It reaches every authority of the federal government, whether or not that authority answers to another agency.¹ Cabinet departments, independent regulatory commissions, and specialized offices are all covered. If a federal entity writes rules, issues licenses, or makes decisions that affect your rights, it almost certainly falls under the Act.

The statute excludes Congress, the federal courts, and territorial governments entirely. Courts martial, military commissions, and military authority exercised in wartime or occupied territory are also outside its reach.¹ The Act focuses on the executive branch’s civilian regulatory machinery.

How Federal Regulations Get Written

Most federal regulations go through notice-and-comment rulemaking, the APA’s default method for creating binding rules. The process starts when an agency publishes a notice of proposed rulemaking in the Federal Register describing the legal basis for the rule and what it would do.² That notice opens a window for anyone to submit written feedback. The APA itself sets no specific minimum for how long that window stays open, but Executive Order 12866 directs agencies to provide at least 60 days for significant regulatory actions.³ In practice, most agencies allow 30 to 60 days.

After the comment period closes, the agency reviews the feedback and decides whether to finalize the rule, modify it, or withdraw it. If it moves forward, it must publish the final rule at least 30 days before the rule takes effect.² Agencies that skip these steps or ignore substantive comments risk having a court strike the rule down as procedurally defective. Comments that include specific data, real examples, or technical analysis carry more weight than general statements of support or opposition.⁴

When Agencies Can Skip Public Comment

Not every agency action goes through the public comment process. The APA exempts several categories outright. Rules involving military or foreign affairs functions, and matters related to agency management, personnel, public property, loans, grants, benefits, or contracts can all skip notice-and-comment entirely.² Those carve-outs are broad, and a significant volume of agency activity never sees public input as a result.

Three additional categories are also exempt: interpretive rules, general statements of policy, and rules of agency organization, procedure, or practice.⁵ The distinction matters because agencies sometimes characterize what is really a binding rule as a mere “policy statement” or “guidance document” to avoid public comment. Courts police that boundary, and an agency that publishes what amounts to a binding regulation without comment risks invalidation.

The Act also includes a “good cause” exception, allowing an agency to skip public notice when it would be impracticable, unnecessary, or contrary to the public interest. The agency must include its reasoning in the published rule.⁵ Agencies typically invoke it during emergencies. Courts treat the exception narrowly and reject vague or boilerplate justifications.

Formal Rulemaking

A heavier version, called formal rulemaking, applies only when another federal statute specifically requires a rule to be made “on the record after opportunity for an agency hearing.”⁶ When that trigger language appears, the agency must hold a trial-like hearing where parties present evidence and cross-examine witnesses, and the final rule must rest entirely on the hearing record.⁷ Congress has largely stopped writing that trigger language into new statutes, so formal rulemaking is rare in modern practice.

Agency Hearings and Adjudication

Where rulemaking creates generally applicable standards, adjudication applies existing rules to specific people or companies. A license revocation, an enforcement action against a business, a claim for government benefits — all are adjudications. The APA’s formal adjudication provisions apply when a federal statute requires the decision to be made on the record after a hearing.⁸

In a formal adjudication, an Administrative Law Judge presides. The ALJ functions as an independent decision-maker within the agency, insulated from the staff who investigated or prosecuted the case. That separation matters: the same people who built the case against you cannot advise the judge who decides it.⁸ Parties present documents and testimony, cross-examine witnesses, and make legal arguments. The ALJ issues an initial decision, which the agency head can adopt, modify, or reverse.

The vast majority of federal adjudications, however, are informal. Social Security disability claims, immigration proceedings, and veterans’ benefits decisions all involve agency adjudication, but many don’t follow full trial-type procedures. For informal adjudication, the APA provides a thinner set of protections: the right to retain counsel, the right to appear before the agency, and the right to receive an explanation when the agency denies a request.⁹ The specific procedures often come from the agency’s own regulations or the statute that created the program.

Whether formal or informal, you have the right to bring a lawyer or, if the agency permits, another qualified representative to any proceeding where you must appear.⁹ Because agency hearings can determine whether you keep a professional license, face a civil penalty, or receive benefits you depend on, showing up unrepresented is a serious gamble.

Challenging an Agency Action in Court

When an agency issues a rule you believe is unlawful or makes a decision that harms your business, the APA provides a path to challenge that action in federal court. Several prerequisites must be satisfied first.

The threshold question is standing. Under the APA, you must be someone who suffered a legal wrong because of the agency’s action, or who is adversely affected by it within the meaning of the statute the agency administered.¹⁰ The Constitution adds its own requirements: a concrete injury, a causal link between that injury and the agency action, and a likelihood that a court ruling can fix it. Abstract disagreement with a regulation isn’t enough.

The agency action must also be final. Only completed agency decisions that carry legal consequences are directly reviewable. Preliminary steps and procedural rulings can be raised when the final action is reviewed but not challenged on their own.¹¹ An agency action counts as final even if you haven’t applied for reconsideration or appealed to a higher official within the agency, unless the agency’s own rules both require that appeal and make the action inoperative while it is pending.¹² Courts cannot impose additional exhaustion requirements on their own. This is one of the most commonly misunderstood pieces of APA litigation: the old blanket rule that you must exhaust every internal remedy before going to court is not what the statute actually says.

You will also need the administrative record — the documents, data, public comments, and internal analysis the agency relied on when making its decision. You can often obtain this from the agency directly, or through a Freedom of Information Act request.¹³ The record matters because a reviewing court generally limits itself to what was in front of the agency at the time. Evidence you discover afterward, or arguments you never raised during the comment period, will usually be off-limits.

When Courts Cannot Review an Agency Decision

Two situations put agency action beyond judicial review. First, Congress can write a statute that explicitly bars court review of a particular type of agency decision. Second, some decisions are “committed to agency discretion by law,” meaning the statute gives the agency such broad judgment that no meaningful legal standard exists for a court to apply.¹⁴ Before investing in a challenge, check whether the statute that authorized the agency action provides standards a court could actually enforce. If it doesn’t, the case likely ends before it begins.

How Courts Review Agency Decisions

Once a challenge reaches federal court, the judge doesn’t start from scratch. Review operates under deferential standards, though how deferential depends on the type of action.

Arbitrary and Capricious Review

For informal agency actions, including most regulations created through notice-and-comment, courts apply the “arbitrary and capricious” test.¹⁵ An agency action fails when the agency relied on factors Congress didn’t intend it to consider, entirely failed to address an important aspect of the problem, offered an explanation that contradicts the evidence in the record, or reached a conclusion so implausible it can’t reasonably be attributed to a difference in expert opinion.¹⁶ The court doesn’t substitute its own policy judgment. But it does require the agency to show its work. Conclusory reasoning, ignored evidence, and unexplained departures from prior practice all provide grounds for invalidation.

Substantial Evidence Review

When the challenge targets a formal rulemaking or formal adjudication conducted on the record, courts apply the substantial evidence test.¹⁵ The question is whether a reasonable person, looking at the entire hearing record, could have reached the same conclusion the agency did. It’s somewhat more rigorous than arbitrary-and-capricious review because the court evaluates the record evidence directly, but it doesn’t allow the judge to reweigh testimony or second-guess credibility calls the ALJ made.

Legal Interpretation After Loper Bright

For decades, federal courts followed “Chevron deference,” a doctrine that required judges to accept an agency’s reasonable interpretation of an ambiguous statute the agency was charged with administering. That framework ended in June 2024 when the Supreme Court decided Loper Bright Enterprises v. Raimondo. The Court held that the APA requires courts to exercise their own independent judgment when deciding whether an agency has acted within its statutory authority, and that courts may not defer to an agency’s reading of the law simply because the statute is ambiguous.¹⁷

The practical shift is significant. Under Chevron, agencies prevailed in roughly 77% of lower-court cases where a court applied the deference framework. Under the pre-Chevron “Skidmore” standard, where agency interpretations could be considered persuasive but not controlling, agencies won only about 56% of the time.¹⁸ Courts must now interpret statutes using the traditional tools of statutory construction. An agency’s expertise and reasoning may be persuasive, but a judge who disagrees with the agency’s reading is no longer obligated to go along with it.¹⁷ For regulated businesses and individuals, this opens the door to challenges that would have been nearly impossible under the old regime.

Remedies and Filing Deadlines

When a court finds an agency action unlawful, the most common remedy is vacatur: the court sets aside the rule or decision entirely, and the agency must start over if it wants to try again.¹⁵ Courts can also compel an agency to act when it has unreasonably delayed a decision it was required to make. In some cases, a court may remand the matter back to the agency for further explanation without vacating the rule. Remand without vacatur is used when the agency’s reasoning was flawed but the rule could survive better justification, and vacating it would cause serious disruption.¹⁹ The remedy is contested: the APA’s text says courts “shall hold unlawful and set aside” actions that fail judicial review, and critics argue that remand without vacatur lets agencies keep unlawful rules in place while they patch up the rationale.

The default statute of limitations for challenging federal agency actions is six years from the date your claim accrues.²⁰ The critical question is when the clock starts. In 2024, the Supreme Court held in Corner Post, Inc. v. Board of Governors that the six-year period begins when the plaintiff is actually injured by the agency action, not when the agency first issued the rule.²¹ A regulation might be 20 years old, but if it first harms your business today, your six-year window opens today. The ruling substantially expanded the window for challenging longstanding regulations.

Recovering Attorney Fees

Challenging a federal agency in court is expensive, and the APA itself doesn’t provide for recovery of legal costs. The Equal Access to Justice Act fills that gap. If you prevail against the government in a civil action, including judicial review of agency action, you can recover attorney fees and expenses unless the court finds that the government’s position was “substantially justified” or that special circumstances make an award unjust.²²

Eligibility is capped by net worth and size. Individuals must have a net worth of no more than $2 million. Businesses, partnerships, and organizations must have a net worth under $7 million and fewer than 500 employees at the time the case was filed. Tax-exempt charitable organizations and agricultural cooperatives can qualify regardless of net worth, but the employee cap still applies.²² Attorney fees are capped at $125 per hour under the statute’s base rate, though courts can approve higher rates based on cost-of-living adjustments or the limited availability of qualified attorneys. In practice, adjusted rates are significantly higher than the base.

The “substantially justified” test is where most fee disputes play out. The government doesn’t have to prove it was right. It only has to show its position had a reasonable basis in law and fact. If the agency’s legal theory was at least plausible, even if ultimately rejected, you may win the case but lose the fee petition. That asymmetry makes the decision to challenge an agency action a real financial calculation, especially for individuals and small businesses operating close to the eligibility limits.

1
Office of the Law Revision Counsel. 5 USC 551 – Definitions
2
Office of the Law Revision Counsel. 5 USC 553 – Rule Making
3
Administrative Conference of the United States. Executive Order 12866 – Regulatory Planning and Review
4
Regulations.gov. Public Comment on Federal Regulations
5
Office of the Law Revision Counsel. 5 US Code 553 – Rule Making
6
Office of the Law Revision Counsel. 5 USC 556 – Hearings; Presiding Employees; Powers and Duties; Burden of Proof; Evidence; Record as Basis of Decision
7
Office of the Law Revision Counsel. 5 USC 557 – Initial Decisions
8
Office of the Law Revision Counsel. 5 USC 554 – Adjudications
9
Office of the Law Revision Counsel. Title 5 – Section 555
10
Office of the Law Revision Counsel. 5 USC 702 – Right of Review
11
Office of the Law Revision Counsel. 5 USC 704 – Actions Reviewable
12
Legal Information Institute. Darby v Cisneros, 509 US 137 (1993)
13
FOIA.gov. Freedom of Information Act – How to Make a FOIA Request
14
Office of the Law Revision Counsel. 5 USC 701 – Application; Definitions
15
Office of the Law Revision Counsel. 5 USC 706 – Scope of Review
16
Legal Information Institute. Motor Vehicle Manufacturers Association v State Farm Mutual Automobile Insurance Co
17
Supreme Court of the United States. Loper Bright Enterprises v Raimondo
18
Congressional Research Service. Loper Bright Enterprises v Raimondo and the Future of Agency Deference
19
Administrative Conference of the United States. The Unusual Remedy of Remand Without Vacatur
20
Office of the Law Revision Counsel. 28 US Code 2401 – Time for Commencing Action Against United States
21
Supreme Court of the United States. Corner Post Inc v Board of Governors, FRS
22
Office of the Law Revision Counsel. 28 USC 2412 – Costs and Fees