A writ of certiorari is an order from the U.S. Supreme Court directing a lower court to send up the record of a case so the justices can review it. The Court uses the writ to choose which cases it will hear, and it says no far more often than yes: during the October 2024 Term, the justices granted just 68 of roughly 4,000 petitions they considered. Because review is entirely discretionary, getting a “cert” petition granted is less about proving the lower court was wrong and more about showing the case raises a legal question the nation needs answered.
Why the Supreme Court Grants Certiorari
Supreme Court Rule 10 lists the reasons the justices agree to hear a case, and the common thread is conflict or national importance rather than error correction.1Legal Information Institute. Rule 10 – Considerations Governing Review on Writ of Certiorari The most familiar trigger is a circuit split: two or more federal appellate courts have reached opposite conclusions on the same legal question, so the law effectively means different things depending on where you live. Only the Supreme Court can fix that.
The Court also steps in when a federal appellate court or a state court of last resort decides an important federal question that conflicts with Supreme Court precedent, or when a significant federal issue has never been settled at the national level. Rule 10 warns that these categories are illustrations, not a checklist. The justices keep broad discretion to deny review even when a case technically fits. Petitions that frame a clear, recurring conflict affecting many people do far better than those that simply argue the lower court got it wrong.
How the Justices Choose Cases: The Rule of Four
Most justices participate in a “cert pool,” where their law clerks divide up incoming petitions and write summary memos recommending whether each one deserves attention.2Legal Information Institute. Certiorari – Wex – US Law Any justice who wants a petition discussed at the private conference places it on the “discuss list.” Petitions that never make the list are automatically denied.
At conference, the justices vote on the discussed petitions under what is known as the Rule of Four. If at least four of the nine justices agree a case warrants full review, certiorari is granted.3Legal Information Institute. Writ of Certiorari – Wex – US Law Fewer than four means denial, and the lower court’s decision stands. This threshold is deliberately lower than the five-vote majority needed to decide a case on the merits; the idea is that a substantial minority of the bench should be enough to put a legal question on the national stage.
What Goes Into a Certiorari Petition
Supreme Court Rule 14 sets out the required contents of every certiorari petition, and the order is fixed.4Legal Information Institute. Rule 14 – Content of a Petition for a Writ of Certiorari The single most important element is the “Questions Presented,” which must appear on the first page after the cover with nothing else on that page. Vague or sprawling questions signal that the petitioner does not know what the case is really about, and clerks notice.
After the questions presented, the petition must include:
- A list of every party from the lower court proceeding, unless the caption already names them all.
- A jurisdictional statement explaining how the Court has authority to hear the case, typically citing 28 U.S.C. § 1254 for cases from a federal appellate court or 28 U.S.C. § 1257 for cases from a state court of last resort.5Office of the Law Revision Counsel. 28 USC 1254 – Courts of Appeals; Certiorari; Certified Questions6Office of the Law Revision Counsel. 28 USC 1257 – State Courts; Certiorari
- A concise statement of the relevant facts and procedural history.
- An argument explaining why the case meets Rule 10’s criteria and why the lower court’s decision was wrong.
- An appendix with full copies of every opinion and order from the courts below.
Any petition longer than 1,500 words also needs a table of contents and a table of cited authorities, which in practice means almost every filing includes both.
Formatting, Length, and Copies
The Court is exacting about the physical document, and petitions that don’t comply get bounced. Paid petitions must be printed in booklet format on 6⅛-by-9¼-inch paper, with a white cover for the petition, orange for the brief in opposition, and tan for the reply.7Legal Information Institute. Rule 33 – Document Preparation: Booklet Format; 8 1/2 by 11 Inch Paper Format Forty printed copies of the petition must be filed, plus one unbound copy on standard 8½-by-11-inch paper.
A certiorari petition cannot exceed 9,000 words. A reply brief is capped at 3,000. Those limits exclude the questions presented, tables, counsel listing, and appendix, but they include footnotes. Petitioners filing on standard paper instead of booklet format face page limits of 40 pages for the petition and 15 for the reply.
Deadline, Extensions, and Filing Fee
A certiorari petition must be filed within 90 days after the lower court enters its judgment.8Legal Information Institute. Rule 13 – Review on Certiorari: Time for Petitioning The clock starts from the date judgment is entered, not from the date the court issues its mandate. If any party timely files for rehearing in the lower court, the 90-day window resets and runs from the denial of rehearing or, if rehearing is granted, from the new judgment.
A single justice may extend the deadline by up to 60 days for good cause, but extensions are disfavored. The application must be filed at least 10 days before the original deadline expires, must explain the specific reasons for the delay, and must name each party seeking the extension. The filing fee is $300.9Legal Information Institute. Rule 38 – Fees
Filing Without Paying: In Forma Pauperis
Petitioners who cannot afford the fee or the cost of printing 40 booklet-format copies can seek in forma pauperis (IFP) status, Latin for “in the manner of a pauper.” That requires a motion for leave to proceed IFP along with a notarized affidavit or declaration of indigency on the form prescribed by the Federal Rules of Appellate Procedure.10Supreme Court of the United States. Rules of the Supreme Court of the United States – Rule 39 If the lower court already appointed counsel, the affidavit is unnecessary, and citing the appointment order suffices.
IFP filers submit an original and 10 copies of the petition on standard 8½-by-11-inch paper rather than in booklet form.11Supreme Court of the United States. Guide for Prospective Indigent Petitioners for Writs of Certiorari IFP cases go on the Court’s Miscellaneous Docket and are not subject to the $300 fee.
What Happens After the Petition Is Filed
Once the Clerk’s office dockets the petition and notifies the opposing party, the respondent has 30 days to file a brief in opposition.12Legal Information Institute. Rule 15 – Briefs in Opposition; Reply Briefs; Supplemental Briefs Opposition is optional in most cases, though the Court can order one; in capital cases it is mandatory. The petitioner may then file a reply addressing new points, but the Court will not delay its review to wait for it.
Outside parties who want to weigh in can file amicus curiae (“friend of the court”) briefs at the certiorari stage, provided they have the written consent of all parties or the Court’s permission.13Legal Information Institute. Rule 37 – Brief for an Amicus Curiae When a petition draws multiple amicus briefs, especially from the federal government, the justices tend to take notice. It is one of the informal signals that a case raises issues of broad significance. After all papers are in, the Clerk distributes the materials for the next available conference, and the justices vote under the Rule of Four.
If Certiorari Is Granted
A grant is the starting line, not the finish. The petitioner has 45 days from the date the writ is granted to file a brief on the merits, a full-length argument that goes deeper than the petition.14Legal Information Institute. Rule 25 – Briefs on the Merits: Number of Copies and Time to File The respondent then gets 30 days after the petitioner’s brief for its own merits brief, and the petitioner may reply within 30 days after that. The reply must reach the Clerk by 2 p.m. at least 10 days before oral argument.
Oral argument typically gives each side 30 minutes to address the justices directly, and the justices frequently interrupt with questions.15Supreme Court of the United States. The Court and Its Procedures Arguments are held on Mondays, Tuesdays, and Wednesdays when the Court is in session, with two cases usually heard per morning. Afterward the justices meet in private conference to vote on the outcome, and the senior justice in the majority assigns the opinion. The full decision can take weeks or months to issue.
If Certiorari Is Denied
When the Court denies a petition, the lower court’s ruling becomes the final word in that case. A denial carries no precedential weight. The Court has said repeatedly that refusing to hear a case says nothing about whether the lower court was right; there may simply not have been four justices interested enough in the legal question to take it on. Lawyers sometimes read denials as tacit approval of the ruling below, but that misunderstands how the process works. The Court picks cases to resolve national legal conflicts, not to grade individual decisions.