How to Write a Case Brief (IRAC Format, With an Example)

I have read a great many case briefs that were really summaries wearing a brief’s clothes. The student had read the opinion, understood most of it, and written down what happened. Then someone asked what test the court applied and why the case came out that way, and the page had no answer. That gap, between what happened and why it mattered, is the whole reason briefs exist.

A case brief is a short, structured account of a court decision that you write for your own use. It pulls out of a long opinion the handful of things you will need again: what happened, what legal question the court had to answer, what rule it used, how that rule met these facts, and what the court decided. It is in your own words, it fits on a page or two, and it is built to be glanced at under pressure. Nobody grades the prose. What gets tested is whether you found the reasoning.

It helps to be plain about what a brief is not. It is not a summary of the opinion in the order the judge wrote it, and it is not a reaction piece on whether the court got it right. Those are fine assignments; they are different ones. This guide teaches the brief with IRAC, works two real appellate decisions I have checked against the public record, and explains why a famous criminal trial does not fit the same mold. Every worked example here is a model to learn from and then set aside.

The case brief format: IRAC, taken seriously

IRAC stands for Issue, Rule, Application, Conclusion. It is a method for organizing legal analysis, and it fits an appellate opinion naturally, because an appellate court answers a question of law and shows how it got there. Some courses add a Facts step at the front and call it FIRAC; others state the conclusion first and again at the end and call it CREAC. The engine in the middle is the same.

The Issue is harder to write than it looks, because a good one carries the decisive facts inside the question. “Does squeezing a bus passenger’s soft luggage count as a search under the Fourth Amendment?” tells a reader what the case is about in a single line. “Did the agent violate Bond’s rights?” tells them nothing.

The Rule wants precision over coverage. If the court applied a named test, name it and state its parts. If it construed a statute, quote the operative words.

The Application is where the grade lives. A judge does not simply announce that the rule applies; the judge explains why these facts fall on one side of the line and not the other, often by comparing them to an earlier case. Your job is to capture that bridge in two or three sentences of your own. If your Application could be dropped into a brief of a different case without anyone noticing, it is not an Application.

The Conclusion is short and includes the procedural result; “reversed” and “affirmed” are different outcomes for the parties even when the principle sounds the same.

One reading habit makes all four steps easier. Read the opinion backward: find the disposition in the last paragraph, find the sentence that states the holding, and only then go back to the facts with the holding in mind.

The holding tells you which facts mattered.

Case brief example: Bond v. United States (2000)

Citation. 529 U.S. 334 (2000). United States Supreme Court, decided April 17, 2000. Majority opinion by Chief Justice Rehnquist, 7 to 2, with Justices Breyer and Scalia dissenting.

Facts. A Border Patrol agent boarded a bus in Texas during an immigration check. Walking the aisle, he squeezed the soft luggage in the overhead racks and felt a brick-like object inside a bag belonging to Steven Bond. Bond acknowledged the bag was his and agreed to open it; inside was methamphetamine. Bond argued that the squeeze itself was a search the agent had no right to make.

Issue. Does a law enforcement officer’s physical manipulation of a bus passenger’s carry-on bag, without a warrant or suspicion, count as a search under the Fourth Amendment?

Rule. The Fourth Amendment forbids unreasonable searches. Under the two-part test from Katz v. United States, government conduct is a search when it intrudes on an expectation of privacy that the person actually held and that society is prepared to recognize as reasonable.

Application. The Court accepted that a traveler who puts a bag in an overhead rack expects other passengers or employees to move it, push it aside, or brush against it. What the traveler does not expect is someone feeling the bag in an exploratory way to learn what is inside, which is what the agent did. Because the bag was opaque and Bond kept it close, his expectation of privacy in its contents was real, and it was one society would accept as reasonable.

Conclusion. The physical manipulation of the bag was a search and violated the Fourth Amendment. The judgment below was reversed.

Second case brief example: Awad v. Ziriax (2012)

Citation. 670 F.3d 1111 (10th Cir. 2012). United States Court of Appeals for the Tenth Circuit, on appeal from the Western District of Oklahoma.

Facts. On November 2, 2010, Oklahoma voters approved State Question 755, the “Save Our State Amendment,” by roughly seventy percent. It would have amended the state constitution to forbid Oklahoma courts from considering international law or Sharia law. Muneer Awad, a Muslim resident of the state, sued the members of the Oklahoma State Election Board, including Curt Ziriax, to stop certification. The district court granted a temporary restraining order that November and then a preliminary injunction. The board appealed.

Issues. First, did Awad have standing to challenge the amendment before it took effect? Second, was he likely to succeed on his claim that the amendment violated the Establishment Clause?

Rule. A plaintiff has standing when he can show a concrete, personal injury traceable to the challenged law. On the merits, a law that discriminates among religions is subject to strict scrutiny under Larson v. Valente: the state must show that the law is closely fitted to a compelling governmental interest.

Application. On standing, the court found that a constitutional amendment condemning one faith by name inflicts a real injury on a member of that faith, not a generalized grievance. On the merits, the amendment singled out Sharia, treating one religion differently from all others, so Larson applied. The state could not identify a compelling interest the amendment served, and so could not satisfy the test.

Conclusion. The Tenth Circuit affirmed the preliminary injunction, and the amendment stayed blocked. In August 2013 the district court entered final judgment striking it down.

Why a trial does not brief like an appeal: State v. Chauvin

Every year a few students bring me a brief of the Derek Chauvin trial with an Issue, a Rule, and a Holding neatly filled in. It is an honest mistake, and working out why it fails teaches a great deal about briefing.

State of Minnesota v. Derek Michael Chauvin was tried in Hennepin County District Court before Judge Peter Cahill from March 8 to April 20, 2021. Chauvin was charged in the death of George Floyd on May 25, 2020, with second-degree unintentional murder, third-degree murder, and second-degree manslaughter. On April 20, 2021, the jury found him guilty on all three counts. On June 25, 2021, the court sentenced him to twenty-two and a half years.

Nothing in that record is a holding. A jury verdict is an answer on the facts, reached by twelve people who wrote nothing down. There is no opinion explaining a rule and applying it. If you write “Rule: a police officer who kneels on a suspect’s neck commits murder,” you have invented a legal rule that no court stated.

What a trial does have is a structure of its own, and a written analysis should follow it:

• Charges. Each count the prosecution brought, with the statute it rests on.
• Elements. For each count, what the state had to prove beyond a reasonable doubt.
• Evidence. The key testimony, video, and expert opinion for and against each element.
• Instructions and verdict. How the jury was told to apply the elements, and what it decided on each count.
• Analysis. Your account of why the evidence met, or fell short of, each element.

That framework mirrors how a trial decides guilt, count by count and element by element, and it keeps your paper analytical instead of sliding into a retelling of the news coverage, the commonest way a trial essay goes wrong.

One more wrinkle. Chauvin appealed. The Minnesota Court of Appeals affirmed his conviction on April 17, 2023, the Minnesota Supreme Court declined further review that July, and the United States Supreme Court denied certiorari in November 2023. That appellate decision is a written opinion, and it can be briefed with IRAC. The right question is never “can this case be briefed” but “which document am I holding.”

A student brief against the opinion it comes from

Students sometimes treat the published opinion as an answer key and reproduce it in miniature. Knowing how the two documents differ tells you what to cut.

The right column is smaller in every row, and that is the point.

Common mistakes

1. Copying the headnote, or a commercial brief, instead of writing your own. The understanding is produced by the writing; a borrowed brief leaves you a page you cannot defend.
2. Writing facts plus outcome and stopping. That is a summary with headings; the Application is the section being tested.
3. Stating the rule as a slogan. “Unreasonable searches are unconstitutional” is true and useless; the Katz two-part test is the rule Bond turns on.
4. Ignoring procedural posture. A preliminary injunction, a motion to dismiss, and a final judgment ask different questions, and the holding is only as strong as the posture allows.
5. Treating a trial verdict as a holding. With no written opinion there is no rule to extract; switch to the charge-to-verdict structure above.

What to take from this

The method travels. Once you can isolate the legal question, state the rule the court used, and explain in your own words how the court connected that rule to the facts, you can brief nearly any appellate opinion, and you can tell at a glance when a document, like a trial record, needs a different shape. Find the holding first, write from a blank page, and aim to make the moves on the next case with no model in front of you.