What Is En Banc Review: Grounds, Process, and Precedent

An en banc review is a proceeding in which all the active judges of a federal appellate court hear a case together, rather than the usual panel of three. The phrase comes from French, roughly meaning “on the bench,” and signals that the court considers the case important enough for the full bench’s attention.¹ It is uncommon by design. The Federal Rules of Appellate Procedure state that en banc proceedings “are not favored,” and fewer than one percent of federal appeals reach the full court.²

Why the Procedure Exists

Federal appeals are normally decided by panels of three judges, at least two of whom must be judges of that court.³ That setup is efficient, but it has a side effect: different three-judge panels on the same circuit can reach opposite conclusions on the same legal question. When that happens, lawyers and lower-court judges have no clear rule to follow.

En banc review exists mostly to fix that problem. The full court steps in to settle the disagreement and establish one controlling rule for the entire circuit. The second reason the court uses the procedure is to take on cases of exceptional importance, such as major constitutional questions, significant policy issues, or situations calling for reconsideration of a long-standing precedent. The rules reinforce that en banc review is reserved for these situations and is not a second chance for a losing party unhappy with the panel.²

The Four Grounds for Rehearing En Banc

A petition for rehearing en banc must show that the case falls into at least one of four categories recognized by the Federal Rules of Appellate Procedure:²

Intra-circuit conflict. The panel’s decision conflicts with another decision from the same court, and the full court’s review is needed to maintain uniform law within the circuit.
Conflict with the Supreme Court. The panel’s decision conflicts with a ruling of the U.S. Supreme Court.
Inter-circuit conflict. The panel’s decision conflicts with a decision from a different federal circuit.
Exceptional importance. The case involves a question significant enough to warrant the full court’s attention even without a direct conflict.

The petition must identify which ground applies and cite the specific conflicting decisions. A general claim that the panel got it wrong does not meet the threshold. Courts look for concrete, demonstrable conflicts or genuinely extraordinary legal questions.

How a Party Asks for En Banc Review

The losing party before the three-judge panel can file a petition for rehearing en banc, and the clock is short. The petition must be filed within 14 days after the court enters judgment, or within 45 days if a federal government party is involved.² Missing that deadline generally forfeits the right to seek en banc review.

The petition itself is strictly limited in length. Under the federal rules, it cannot exceed 3,900 words if prepared on a computer, or 15 pages if handwritten or typewritten.² Individual circuits can modify these limits through local rules, but most keep petitions short. The constraint is intentional: the petition should identify a specific conflict or question of exceptional importance, not reargue the whole case.

A petition is not the only path. Any active judge on the court can independently call for a vote on whether to hear a case en banc, even if no party has asked.² This typically happens when a judge sees a conflict with existing circuit precedent or has serious concerns about the panel’s reasoning.

What Happens When En Banc Is Granted

Once a petition is filed or a judge calls for a vote, the request circulates to all active judges on the court. A majority of the circuit’s active, non-disqualified judges must vote in favor for en banc review to proceed.² That vote is itself a significant hurdle, which is one reason en banc grants are rare.

In most circuits, the original panel’s decision is vacated once en banc review is granted, meaning it loses its legal force and cannot be cited as binding precedent. The specific practice varies. Some circuits automatically vacate both the opinion and the judgment. Others vacate only the judgment or treat the panel opinion as non-precedential rather than formally vacating it. The practical effect is the same across circuits: the panel’s ruling no longer controls.

After granting review, the court has discretion over how to proceed. It typically orders new briefing and fresh oral argument, but the rules also allow the court to decide the case without further argument or to issue other procedural orders.²

Who Sits on the En Banc Court

By default, the en banc court consists of all circuit judges in regular active service. For most circuits that means somewhere between 6 and 17 judges, depending on the court’s authorized size. Senior judges generally do not participate. There are two exceptions: a senior judge may sit if they were a member of the original three-judge panel being reviewed, or if they were in regular active service when the en banc hearing was first ordered.³

The Ninth Circuit’s Limited En Banc Court

The Ninth Circuit is the largest federal appellate court, with 29 active judgeships. Convening all of them for a single case would be unwieldy, so federal law authorizes circuits above a certain size to use a “limited en banc” panel.³ The Ninth Circuit’s version consists of 11 judges: the Chief Judge and 10 others drawn at random for each case. The decision carries the same legal weight as a full-court en banc proceeding in other circuits.

The Weight of an En Banc Decision

An en banc ruling carries more legal force than an ordinary panel decision. A regular three-judge panel decision can be overturned by a later en banc court, but an en banc decision is the definitive word of that circuit. Every future three-judge panel on the court, and every federal district court within the circuit’s geographic boundaries, must follow it. Only the Supreme Court can reverse or modify an en banc ruling.

That is why these decisions attract so much attention. They resolve uncertainty and sometimes shift the law significantly within a circuit. Because the Supreme Court takes only a small fraction of the cases presented to it, the en banc decision is often the last word on the question for everyone inside that circuit’s boundaries.

What Comes After

If the court denies en banc review, the original panel decision stands as the final judgment of the court of appeals. The losing party can then petition the Supreme Court for a writ of certiorari. A party does not need to seek en banc review first before going to the Supreme Court, though a denial can sometimes spotlight a circuit split that makes the Court more likely to grant review.

If en banc review is granted and the full court decides the case, the losing party at that stage can also seek Supreme Court review. The en banc decision is the final judgment of the circuit, and the only route to overturning it runs through the Supreme Court. Given the Court’s limited docket, most en banc decisions stand as the practical end of the road.

Does En Banc Review Exist in State Courts

En banc review is primarily a federal procedure, but many state appellate courts have their own versions. Availability and mechanics vary widely. Some states allow their intermediate appellate courts to sit en banc under rules similar to the federal ones. Others have no en banc procedure at all, particularly states with smaller appellate systems or no intermediate appellate court. If you are involved in a state appeal, the state’s rules of appellate procedure will govern whether en banc review is available and how to pursue it.

1
Legal Information Institute. En Banc
2
Legal Information Institute. Federal Rules of Appellate Procedure Rule 40 – Panel Rehearing; En Banc Determination
3
Office of the Law Revision Counsel. 28 US Code 46 – Assignment of Judges; Panels; Hearings; Quorum