The U.S. Supreme Court is the highest court in the country and the final word on what federal law and the Constitution mean. Understanding how the US Supreme Court works comes down to a few moving parts: nine justices appointed for life, a narrow set of cases the Court chooses to hear each year, and rulings that bind every other court in the nation.1National Archives. Federal Judiciary Act (1789)
Who Sits on the Court
The Court has nine members: one Chief Justice and eight Associate Justices. That number isn’t in the Constitution. Congress sets it by statute, and it has changed six times before settling at nine in 1869.2Supreme Court of the United States. The Court as an Institution
The Constitution lists no formal qualifications. No minimum age, no citizenship requirement, no requirement to hold a law degree or any legal training.3Supreme Court of the United States. Frequently Asked Questions – General Information Every justice who has ever served happened to be a lawyer, but that’s tradition. In theory a President could nominate anyone.
How a Justice Gets the Job
The process starts with a presidential nomination to fill a vacancy. The nomination goes to the Senate Judiciary Committee, which holds public hearings where senators question the nominee about their legal views, record, and temperament. After the committee votes, the full Senate votes on confirmation. A simple majority is enough.
How Long They Stay
Once confirmed, a justice serves for life. Article III, Section 1 provides that federal judges hold office “during good behavior,” a standard borrowed from English law that in practice means they serve until they retire, resign, or die in office.4Constitution Annotated. Article III Section 1 – Overview of Good Behavior Clause Lifetime tenure is designed to insulate the judiciary from political pressure; a justice who never faces reelection has little reason to bend to popular opinion.
The only way to force a justice off the bench is impeachment by the House followed by conviction in the Senate, for “treason, bribery, and other high crimes and misdemeanors.”5USAGov. How Federal Impeachment Works Only one Supreme Court justice has ever been impeached, Samuel Chase in 1805, and the Senate acquitted him. The practical result is that once a justice joins the Court, they stay for as long as they want to.
What the Court Has the Power to Do
The Court’s most important function is judicial review: the power to strike down a federal or state law that conflicts with the Constitution. The Constitution doesn’t say the Court can do this in so many words. The power traces back to Marbury v. Madison in 1803, where Chief Justice John Marshall wrote that it is “emphatically the province and duty of the judicial department to say what the law is.”6Constitution Annotated. Article III Section 1 – Marbury v Madison and Judicial Review A law the Court declares unconstitutional is effectively dead unless the Constitution itself is amended, which requires supermajorities in both Congress and the state legislatures.
Two Kinds of Jurisdiction
The Constitution gives the Court two different ways cases reach it. In a narrow set of disputes, the Court acts as the trial court itself. It has exclusive original jurisdiction over lawsuits between two or more states, which usually means boundary fights or disputes over shared water. It also has original (but not exclusive) jurisdiction over cases involving foreign ambassadors, suits between the federal government and a state, and certain suits by a state against citizens of another state.7Office of the Law Revision Counsel. 28 USC 1251 – Original Jurisdiction
Everything else is appellate. Cases arrive from the 13 federal courts of appeals or from a state’s highest court. For a state case to qualify, there must be a “federal question” at stake: the case has to challenge a federal statute or treaty, raise a conflict between state law and the Constitution or federal law, or assert a right under federal law.8Office of the Law Revision Counsel. 28 USC 1257 – State Courts; Certiorari Appellate review focuses on legal questions. The Court does not reweigh witness testimony or second-guess a jury’s credibility findings.
How a Case Actually Reaches the Court
Nearly every case arrives through a petition for a writ of certiorari, a formal request asking the justices to review a lower court’s decision. The Court receives more than 7,000 petitions each year and accepts only a small fraction for full review.9United States Courts. Supreme Court Procedures Cases that get picked tend to involve splits between federal appeals courts on the same legal question or constitutional issues of national significance.
The Rule of Four
The Court doesn’t need a majority to take a case. Under an internal practice called the Rule of Four, just four of the nine justices must vote to grant a petition.9United States Courts. Supreme Court Procedures When the Court denies a petition, the lower court’s ruling stands. A denial doesn’t mean the justices agree with that outcome; it means they chose not to weigh in.
Deadlines and Fees
A petition for certiorari must be filed within 90 days after the lower court enters judgment. For good cause, a justice can extend that window by up to 60 days. Missing the deadline without an extension kills the petition.10Legal Information Institute. Supreme Court Rule 13 – Review on Certiorari: Time for Petitioning
The filing fee is $300.11Legal Information Institute. Supreme Court Rule 38 – Fees Petitioners who can’t afford it can ask to proceed in forma pauperis by filing a motion with a sworn financial statement. If the Court grants the motion, the case goes on the docket without any fee. A significant share of annual petitions come from prisoners filing without counsel under this provision. The Court can reject the motion if the underlying petition is frivolous.12Legal Information Institute. Supreme Court Rule 39 – Proceedings In Forma Pauperis
What Happens Once the Court Takes a Case
Both sides submit written briefs laying out their legal arguments, the relevant precedent, and the facts they think matter most. Outside parties with a stake in the outcome can file amicus curiae (“friend of the court”) briefs offering additional perspectives, often from federal or state agencies, trade groups, civil rights organizations, or legal scholars.13Legal Information Institute. Supreme Court Rule 37 – Brief for an Amicus Curiae High-profile cases attract dozens.
Oral argument gives the justices a chance to press the lawyers directly. Each side typically gets 30 minutes, though the Court occasionally grants extra time for cases of unusual complexity or when the federal government participates as a separate party. These aren’t polished speeches. Justices interrupt constantly with hypotheticals and probing questions designed to test the limits of each side’s position. The Chief Justice controls the clock and the order of questioning. Audio recordings are released to the public, usually the same day.
Conference and Opinion Writing
After oral argument, the justices meet in a private conference to discuss the case and cast preliminary votes. No one else is allowed in the room. The Chief Justice presents each case and states a view first, then the other justices speak in order of seniority.
If the Chief Justice is in the majority, the Chief assigns who will write the majority opinion. If the Chief is in dissent, the most senior justice in the majority makes the assignment. Opinion writing takes weeks or months, with drafts circulating. Votes can shift during this period. A justice initially in the majority might switch after reading a compelling draft dissent.
Three Kinds of Opinions
- The majority opinion is the Court’s official ruling. It states the outcome and the legal reasoning, and every lower court in the country must follow it.
- A concurring opinion comes from a justice who agrees with the result but reaches it through different reasoning. Concurrences can signal where the law might go next or flag concerns about the majority’s logic.
- A dissenting opinion comes from a justice who disagrees with the outcome. Dissents carry no legal force, but they can influence later Courts, shape public debate, or give Congress a blueprint for legislative response.
What Happens After the Decision
Opinions come out across the term, with the most divisive cases often arriving in the final weeks before the summer recess. When the Court reverses a lower court, it usually remands the case, sending it back for the lower court to redo its analysis under the framework the Supreme Court has now established. The lower court then applies that standard to the facts, which can lead to further proceedings, a new trial, or a settlement. A Supreme Court win doesn’t always end the case; it often means the next phase begins.
The Court’s Annual Calendar
Federal statute sets the Court’s term to begin on the first Monday in October.14Office of the Law Revision Counsel. 28 USC 2 – Terms of Court The term technically runs until the first Monday of the following October, but the justices typically finish issuing opinions and recess by late June or early July.15Supreme Court of the United States. The Court and Its Procedures During active months, the Court alternates between “sittings,” when it hears oral arguments and releases decisions, and “recesses,” when the justices study briefs, draft opinions, and review incoming petitions. The summer break is misleading. Justices continue handling emergency applications and preparing the next term’s docket throughout.
Emergency Orders and the Shadow Docket
Full briefing, oral argument, and a signed opinion represent the Court’s standard process, but a growing share of consequential decisions happen outside that framework. Commentators use the term “shadow docket” to describe the Court’s non-merits orders: everything from routine procedural housekeeping to emergency requests that can freeze or revive major government policies overnight.16Congressional Research Service. The Interim Docket or Shadow Docket: Non-Merits Matters at the Supreme Court
The most significant shadow docket actions are emergency applications: requests to stay a lower court’s order or to issue a preliminary injunction while a case is still being litigated. These come up when waiting for the normal appeals process would cause irreparable harm, such as a state enforcing a law a lower court blocked, or a federal agency implementing a regulation under legal challenge. The All Writs Act gives the Court broad authority to issue whatever orders are necessary to protect its jurisdiction.17Office of the Law Revision Counsel. 28 USC 1651 – Writs
Each justice is assigned to one or more of the 13 federal circuits and handles initial emergency requests from them.18Supreme Court of the United States. Circuit Assignments The assigned justice can act alone, deny the request, or refer it to the full Court. Shadow docket orders can have sweeping nationwide effects despite receiving far less briefing, no oral argument, and sometimes no written explanation. In some instances the Court doesn’t even disclose how individual justices voted.16Congressional Research Service. The Interim Docket or Shadow Docket: Non-Merits Matters at the Supreme Court
Ethics and Recusal
For decades, the Supreme Court was the only federal court without a formal ethics code. Lower federal judges have been subject to the Code of Conduct for United States Judges since 1973, but the justices considered themselves outside its reach. That changed on November 13, 2023, when the Court adopted its own Code of Conduct organized around five canons covering integrity, the appearance of impropriety, impartial performance of duties, outside activities, and political activity.19Supreme Court of the United States. Code of Conduct for Justices of the Supreme Court of the United States
The code addresses gifts, financial dealings, teaching engagements, and the circumstances requiring recusal. Its most discussed limitation is the lack of any independent enforcement body. Each justice decides individually whether to comply, and no external institution can compel them.19Supreme Court of the United States. Code of Conduct for Justices of the Supreme Court of the United States
On recusal specifically, federal law requires any federal judge, including Supreme Court justices, to step aside from a case whenever their impartiality could reasonably be questioned.20United States Department of Justice. Judicial Disqualification Common triggers include a financial interest in one of the parties, a prior professional relationship with a lawyer in the case, or having publicly taken a position on the legal issue at stake. Lower courts can simply swap in another judge. At the Supreme Court there is no substitute. The Court decides that case with eight or fewer members, which means a 4–4 tie is possible. A tie affirms the lower court’s ruling without setting any national precedent.