Interlocutory Judgments: When Pretrial Orders Are Appealable

Interlocutory judgments are rulings a federal trial court issues while a case is still active, and most of them cannot be appealed until the case ends. The final judgment rule in 28 U.S.C. § 1291 limits appellate courts to reviewing decisions that resolve every claim.¹ A narrow set of exceptions lets a party appeal a pretrial order right away, because some rulings carry consequences too severe to survive years of litigation before anyone checks whether the trial judge got it right.

Four main routes exist: appeals available as of right, the collateral order doctrine, discretionary certification under § 1292(b), and class certification review under Rule 23(f). A writ of mandamus sits behind all of them as a last resort. Each path has its own criteria and its own short deadline.

Pretrial Orders You Can Appeal as of Right

Under 28 U.S.C. § 1292(a), three categories of pretrial orders are immediately appealable without needing anyone’s permission:²

Orders granting, refusing, modifying, or dissolving an injunction. Because an injunction restrains conduct immediately, an incorrect one can cause harm that no later ruling repairs.
Orders appointing a receiver or refusing to wind up a receivership. A receiver’s decisions can fundamentally alter the value of the property under control.
Admiralty determinations of the rights and liabilities of the parties, before the court calculates exact damages.

A separate statute, 9 U.S.C. § 16, governs arbitration-related rulings. If a court refuses to stay litigation in favor of arbitration, denies a motion to compel arbitration, or denies confirmation of an arbitration award, the losing party can appeal immediately. The statute is deliberately asymmetric. Orders that push a case toward arbitration, including granting a stay or compelling arbitration, generally cannot be appealed until the case ends.³ A court that says “go arbitrate” is harder to challenge than one that says “no arbitration.”

The Collateral Order Doctrine

Some important pretrial rulings fit no statutory exception. The collateral order doctrine, which traces back to Cohen v. Beneficial Industrial Loan Corp., allows an immediate appeal of a pretrial order only when it meets three strict requirements: the order must conclusively resolve a disputed question, address an issue entirely separate from the merits, and be effectively impossible to correct if the parties have to wait for a final judgment.⁴ All three prongs must be satisfied, and courts read them narrowly.

Qualified Immunity and Other Immunity Denials

The best-known application involves qualified immunity. When a government official invokes qualified immunity and the trial court denies it, the official can appeal immediately. The Supreme Court held in Mitchell v. Forsyth that qualified immunity is not just a defense to liability but an immunity from being subjected to trial at all, a protection destroyed the moment the case proceeds.⁵ The same reasoning applies to denials of sovereign immunity and similar immunity-from-suit claims.

Where the Doctrine Stops

The Supreme Court has refused to stretch the doctrine to cover every serious pretrial ruling. In Mohawk Industries v. Carpenter, the Court held that orders requiring disclosure of attorney-client privileged materials are not immediately appealable under the collateral order doctrine.⁶ The Court reasoned that other mechanisms, including mandamus, remain available, and that expanding the doctrine into privilege disputes would open the floodgates to interlocutory appeals in essentially every discovery fight.

Discretionary Appeals Under Section 1292(b)

If an order qualifies for neither an appeal by right nor the collateral order doctrine, a party can still seek review under 28 U.S.C. § 1292(b). This route requires two gatekeepers to agree.

First, the trial judge must certify the order by stating in writing that it involves a controlling question of law on which reasonable judges could disagree and that an immediate appeal could meaningfully speed up the resolution of the case.⁷ Many judges are reluctant to certify their own orders, so clearing this step is harder than it sounds.

Second, even with certification, the appellate court has complete discretion to accept or reject the appeal. Many certified petitions get turned down.

One critical detail: filing a § 1292(b) appeal does not pause the trial court. The case keeps moving unless a judge specifically orders a stay.⁷ A party who assumes everything freezes upon filing can miss trial court deadlines while waiting on the appellate court.

Class Certification Appeals Under Rule 23(f)

Federal Rule of Civil Procedure 23(f) gives the appellate court discretion to review an order granting or denying class certification. The petition must be filed within 14 days of the certification order, or 45 days if the federal government is a party.⁸

Class certification is often the single most consequential ruling in a case. A defendant facing a certified class of thousands of plaintiffs carries enormous settlement pressure regardless of the merits; a plaintiff whose class is denied may lose the economic viability of the lawsuit altogether. Courts are most willing to grant Rule 23(f) review when certification turns on an unsettled legal question or when the ruling will likely determine whether the case settles or continues.⁸

Writs of Mandamus

When no statutory appeal and no collateral order route is available, a party may petition for a writ of mandamus under 28 U.S.C. § 1651, the All Writs Act.⁹ Mandamus asks the appellate court to order the trial judge to do or stop doing something. It is an extraordinary remedy.

The bar is deliberately high. The party seeking mandamus must show that its right to relief is clear and indisputable, that no other adequate remedy is available, and that the circumstances are exceptional.¹⁰ Mandamus most commonly arises in discovery disputes where a court orders disclosure of privileged or highly sensitive material; the Supreme Court pointed to it as the appropriate vehicle after closing off the collateral order doctrine in Mohawk Industries.⁶ Most mandamus petitions are denied. If the trial judge exercised any reasonable discretion, mandamus will not issue, even if the appellate court might have decided differently.

Deadlines You Cannot Miss

Interlocutory appeal windows are short, and courts enforce them strictly:

Discretionary appeals under § 1292(b): file the petition with the appellate court within 10 days after the trial court enters the certified order.⁷
Appeals by right (injunctions, receivership, admiralty): file the notice of appeal with the district court clerk within 30 days of the order.¹¹
Class certification under Rule 23(f): file the petition within 14 days, or 45 days if the federal government is a party.⁸

When computing these deadlines, exclude the day the order is entered, count every calendar day including weekends and holidays, and if the deadline falls on a Saturday, Sunday, or legal holiday, the period extends to the next business day.¹² Missing the 10-day window under § 1292(b) is almost always fatal. Extensions are granted only under extraordinary circumstances, if at all.

A petition for permission to appeal under Federal Rule of Appellate Procedure 5 must include the facts needed to understand the legal question, the question itself, the relief sought, the reasons the appeal should be allowed, and copies of the order and any written opinion, along with the judge’s certification if the appeal proceeds under § 1292(b).¹³

Filing an Appeal Does Not Pause the Trial Court

One of the most costly misconceptions about interlocutory appeals is that filing one freezes the case below. It does not. Section 1292(b) explicitly provides that an application for appeal does not stay district court proceedings unless a judge orders otherwise.⁷ Discovery, motions, and trial preparation can continue while the appeal is pending.

A party who wants a pause must separately request a stay. Under Federal Rule of Civil Procedure 62, a party can obtain a stay of a judgment by posting a bond or other security approved by the court. The bond protects the other side by guaranteeing that the money or property at issue will be available if the appeal fails. Federal government parties are exempt from the bond requirement.¹⁴ Whether to grant the stay is a judgment call that typically turns on the likelihood of success on appeal, whether the moving party will suffer irreparable harm without a stay, whether a stay would harm the opposing side, and the public interest.

Sanctions for Frivolous Interlocutory Appeals

Interlocutory appeals that lack a reasonable legal basis carry financial risk. Under Federal Rule of Appellate Procedure 38, the court of appeals can award the opposing party damages and single or double costs if it determines the appeal was frivolous. Before imposing sanctions, the court must give the party reasonable notice and an opportunity to respond, either through a separately filed motion from the opposing party or notice from the court itself.¹⁵

Appellate courts already view most interlocutory appeals skeptically. Filing one without a solid legal foundation invites not only denial but a cost order on top of litigation that is already expensive. The narrow windows for these appeals exist precisely because the system does not want them used as delay tactics.

1
Office of the Law Revision Counsel. 28 USC 1291 – Final Decisions of District Courts
2
Office of the Law Revision Counsel. 28 USC 1292 – Interlocutory Decisions
3
Office of the Law Revision Counsel. 9 USC 16 – Appeals
4
United States Court of Appeals for the Third Circuit. Opinion in Graber v. Boresky, No. 21-1407
5
Library of Congress. Mitchell v. Forsyth, 472 U.S. 511 (1985)
6
Legal Information Institute. Mohawk Industries, Inc. v. Carpenter
7
Office of the Law Revision Counsel. 28 USC 1292 – Interlocutory Decisions
8
Legal Information Institute. Federal Rules of Civil Procedure Rule 23 – Class Actions
9
Office of the Law Revision Counsel. 28 USC 1651 – Writs
10
United States Department of Justice. Civil Resource Manual 215 – Mandamus
11
Legal Information Institute. Federal Rules of Appellate Procedure Rule 4 – Appeal in a Civil Case
12
Legal Information Institute. Federal Rules of Appellate Procedure Rule 26 – Computing and Extending Time
13
Legal Information Institute. Federal Rules of Appellate Procedure Rule 5 – Appeal by Permission
14
Legal Information Institute. Federal Rules of Civil Procedure Rule 62 – Stay of Proceedings to Enforce a Judgment
15
Legal Information Institute. Federal Rules of Appellate Procedure Rule 38 – Frivolous Appeal, Damages and Costs