Rule 23(f) was written in 1998 to supply the interlocutory review that certification orders lacked, and having it is precisely why the writ is rarely available.
A ruling that certifies or refuses to certify a class often decides the case. Certification can convert a modest claim into aggregate exposure that no defendant will take to trial; denial can end a case that no individual plaintiff could afford to bring. Neither ruling is a final judgment.
For twenty years the answer to that mismatch was that there was no answer, and litigants reached for the writ. Fed. R. Civ. P. 23(f) changed the arrangement in 1998 by creating a discretionary appeal, and in doing so it largely displaced mandamus for this category of order.
What the courts said before the rule existed
Coopers & Lybrand v. Livesay, 437 U.S. 463 (1978), addressed both theories that plaintiffs had used to appeal certification denials. It held that such an order is not appealable under the collateral order doctrine, because it is subject to revision in the district court, involves considerations enmeshed in the merits, and is reviewable after final judgment. It also rejected the death-knell doctrine, under which a denial that made continued litigation economically irrational was treated as final.
That left mandamus. In re Rhone-Poulenc Rorer Inc., 51 F.3d 1293 (7th Cir. 1995), is the best-known illustration from that period: the Seventh Circuit used the writ to set aside a certification order in a mass tort case, reasoning that the pressure to settle created by certification was itself the harm that could not be repaired on appeal. Decisions of that kind were rare, and they were the argument for a rule.
The text of Rule 23(f) and the deadlines it sets
The rule permits a court of appeals to allow an appeal from an order granting or denying class certification, but not from an order under Rule 23(e)(1) directing notice of a proposed settlement. A party must file a petition for permission to appeal with the circuit clerk within 14 days after the order is entered, or within 45 days if any party is the United States, a United States agency, or a United States officer or employee sued for an act or omission occurring in connection with duties performed on the United States' behalf. An appeal does not stay proceedings in the district court unless the district judge or the court of appeals so orders.
Fed. R. App. P. 5 supplies the mechanics of the petition. Fed. R. App. P. 26(b)(1) forbids extending the time to file a petition for permission to appeal, and in 2019 the Supreme Court relied on that prohibition in holding that the Rule 23(f) period, although a nonjurisdictional claim-processing rule, is not subject to equitable tolling. The fourteen-day window is therefore unforgiving in a way that few civil deadlines are.
Rule 23(f) petition compared with a writ petition
| Rule 23(f) petition | Mandamus petition | |
|---|---|---|
| Source of authority | Fed. R. Civ. P. 23(f); Fed. R. App. P. 5 | 28 U.S.C. § 1651; Fed. R. App. P. 21 |
| Deadline | 14 days, or 45 days with a United States party; not extendable | None fixed, but delay is held against the petitioner |
| What must be shown | Grounds for discretionary permission; the rule states no criteria | The three Cheney conditions |
| Standard applied if accepted | Ordinary appellate review of the certification decision, with Rule 23 findings reviewed for abuse of discretion | Clear and indisputable right, plus discretion to deny |
| Effect on district court | No automatic stay | No automatic stay |
| Who responds | The opposing party, under Fed. R. App. P. 5 | Nobody unless an answer is ordered; Fed. R. App. P. 21(b)(1) bars relief before then |
| Result of a loss | A denial of permission that decides nothing on the merits | Usually an unexplained denial that decides nothing |
Why the rule crowds out the writ
The first Cheney condition asks whether the petitioner has other adequate means to obtain the relief sought. Rule 23(f) is exactly such a means. That it is discretionary, and that the court of appeals may decline to use it, does not make it inadequate; the same is true of the writ itself.
The consequence is a rule of practice rather than a formal bar. A litigant who lets the fourteen days lapse and then files a petition for a writ is asking the court to supply what the rule would have provided, and the missed deadline is itself the reason relief is refused. A litigant whose Rule 23(f) petition was denied and who then seeks a writ on the same grounds is asking the same court to reconsider a discretionary decision it just made.
The space the rule does not cover
Rule 23(f) reaches an order granting or denying certification. Orders that do neither fall outside it, and that is where a writ petition still has a foothold.
- A refusal to decide. Where a district court defers certification indefinitely, there is no order to petition from, and the complaint is about failure to act rather than error, which is the classic mandamus posture.
- Collateral rulings. Appointment of class counsel under Rule 23(g), the content of notice under Rule 23(c)(2), and orders about communications with putative class members are not certification rulings.
- Structural objections. An argument that the district court had no authority to enter the order at all, rather than that it exercised its authority badly, is aimed at jurisdiction and fits the writ's traditional office.
- Non-parties. An absent class member or an objector may have no route under Rule 23(f) and no judgment to appeal.
The finality workaround, closed
Plaintiffs denied certification tried a different route: dismiss the individual claims voluntarily with prejudice, appeal the resulting judgment as final under 28 U.S.C. § 1291, and put the certification ruling before the court of appeals as of right. Microsoft Corp. v. Baker, 582 U.S. 23 (2017), held that this tactic does not create appellate jurisdiction.
The reasoning matters beyond its facts. The Court treated Rule 23(f) as the mechanism the rulemaking process designed for interlocutory review of certification orders, and declined to let a party displace it through case management. The same reasoning is what a court invokes when a writ petition is used to route around the rule.
What neither route delivers
The limits are consistent across both vehicles.
- No certification by appellate order. A court of appeals that finds error vacates and remands; it does not certify the class itself.
- Deference on the findings. Rule 23 determinations rest on a district court's assessment of predominance, typicality, and manageability, reviewed for abuse of discretion, which leaves little room for a clear and indisputable right.
- Revisable orders. Certification can be altered or amended before final judgment, which weakens any claim that the ruling is conclusive.
- No stay comes automatically. Neither a granted Rule 23(f) petition nor a pending writ petition stops the district court, and a separate stay motion is required.
- Settlement pressure is an argument, not a rule. The reasoning of Rhone-Poulenc has not been adopted uniformly, and a petitioner who relies on it is arguing from a circuit decision rather than from a settled standard.
Where the practice is uneven
Rule 23(f) states no criteria for granting permission, and the circuits have filled the gap themselves. Formulations vary: some emphasize a certification order that effectively ends the litigation for one side, some emphasize an unsettled and important legal question likely to escape review, and some emphasize a ruling that appears clearly erroneous. No Supreme Court decision harmonizes them.
The residual role of mandamus is uneven for the same reason. Some courts describe the writ as effectively unavailable for certification questions now that the rule exists; others treat it as available in the narrow categories the rule does not reach. A petitioner should expect the first framing and be prepared to explain why the case falls outside the rule rather than merely outside its deadline.
Key points
- Coopers & Lybrand v. Livesay, 437 U.S. 463 (1978), held certification orders are neither collateral orders nor final under a death-knell theory, which is the gap Rule 23(f) was written to fill.
- Rule 23(f) allows a petition within 14 days, or 45 days when the United States is a party, and Fed. R. App. P. 26(b)(1) makes that period unextendable.
- Because Rule 23(f) supplies an adequate means of review, its existence defeats the first Cheney condition in most petitions aimed at certification rulings.
- The writ retains a role where there is no order granting or denying certification at all, such as an indefinite refusal to rule, or where the objector has no route under the rule.
- Microsoft Corp. v. Baker, 582 U.S. 23 (2017), blocked the voluntary-dismissal path to appellate jurisdiction and treated Rule 23(f) as the designed route.