The judicial branch is the federal court system that interprets U.S. law, resolves disputes under it, and decides whether acts of Congress and the President stay within constitutional limits. It is built on Article III of the Constitution and runs from trial-level district courts up through the courts of appeals to the Supreme Court, which has the final word on what federal law and the Constitution mean. Federal judges serve for life and cannot have their pay cut, so the branch is designed to work without having to please voters or politicians.
Where the Judicial Branch Comes From
Article III of the Constitution does two things. It creates “one supreme Court,” and it gives Congress the power to create whatever lower federal courts the country needs.1Congress.gov. U.S. Constitution – Article III Every federal court below the Supreme Court exists because Congress passed a statute creating it. That is why the system has grown from a small handful of courts in 1789 into the structure that exists now.
The Constitution says nothing about how many justices sit on the Supreme Court. The number changed six times before Congress set it at nine in 1869, where it has stayed.2Supreme Court of the United States. The Court as an Institution The current Court has one Chief Justice and eight Associate Justices.
Two features of Article III protect the branch from pressure. Federal judges hold office “during good Behaviour,” meaning they serve for life unless removed by impeachment. And their pay “shall not be diminished during their Continuance in Office,” so Congress cannot punish an unpopular ruling by cutting a judge’s salary.1Congress.gov. U.S. Constitution – Article III For 2026, district judges earn $249,900, circuit judges $264,900, Associate Justices $306,600, and the Chief Justice $320,700.3United States Courts. Judicial Compensation
What the Judicial Branch Actually Does
The core power of the judicial branch is judicial review: the authority to strike down laws and executive actions that violate the Constitution. The Constitution does not spell out that power. It comes from the 1803 Supreme Court decision in Marbury v. Madison, where Chief Justice John Marshall wrote that “it is emphatically the province and duty of the judicial department to say what the law is.”4Congress.gov. Marbury v. Madison and Judicial Review If a statute conflicts with the Constitution, and the Constitution is the supreme law, the statute is void. Courts have exercised that authority over federal and state laws ever since.
There is a hard limit on when courts can use this power. Federal courts only decide actual cases brought by real parties with real injuries. They do not issue advisory opinions, answer hypothetical questions, or weigh in on policy before a dispute arises.1Congress.gov. U.S. Constitution – Article III Someone has to file a case first.
Federal courts also interpret statutes, enforce federal regulations, resolve disputes between states, handle bankruptcy, and hear admiralty and maritime claims. Most everyday legal disputes in the United States — criminal prosecutions, family law, probate, most contract and injury cases — are handled in state courts, not federal ones. The federal judiciary works in a narrower lane.5United States Courts. Comparing Federal and State Courts
The Three Tiers of Federal Courts
The federal judiciary runs on three levels. A case starts at the bottom and only moves up if someone appeals.
District Courts
District courts are the trial courts of the federal system. This is where federal cases begin, witnesses testify, juries hear evidence, and judges decide facts. There are 94 federal judicial districts, with at least one in every state and one in the District of Columbia. Each district also includes a bankruptcy court.6United States Courts. About U.S. District Courts
District judges share the work with magistrate judges, who handle warrants, initial appearances in criminal cases, pretrial motions, and civil trials when all parties agree. Magistrate judges are appointed by the district court itself rather than by the President and serve renewable terms rather than for life.7United States Courts. Types of Federal Judges
Courts of Appeals
A party that loses in district court can appeal to one of the 13 U.S. Courts of Appeals. Twelve are regional circuits covering different parts of the country. The thirteenth, the Federal Circuit, hears specialized matters like patent cases from across the nation. Appeals courts do not hold new trials or take new evidence. A panel of three judges reviews the record from below and decides whether the law was applied correctly.8United States Department of Justice. Introduction To The Federal Court System
Occasionally all active judges on a circuit will rehear a case together, which is called an en banc rehearing. Circuits typically reserve that for cases where a panel’s ruling conflicts with Supreme Court precedent, with another circuit, or with the circuit’s own prior decisions, or when the case raises a question of exceptional importance. These rehearings are uncommon, and most petitions requesting one are denied.9U.S. Court of Appeals for the Fourth Circuit. Rehearing and Rehearing En Banc
The Supreme Court
The Supreme Court is the final court of appeal. It also has original jurisdiction — meaning cases can start there — over a narrow set of disputes, including cases between states and cases involving ambassadors.10Legal Information Institute, Cornell Law School. U.S. Constitution Article III For everything else, parties file a petition for a writ of certiorari asking the Court to take the case. The Court receives 5,000 to 7,000 petitions each term and grants full review with oral argument in roughly 80.11Supreme Court of the United States. The Supreme Court at Work Four of the nine justices must vote to accept a case, a threshold called the Rule of Four.12United States Courts. Supreme Court Procedures
Once a case is accepted, each side gets about 30 minutes of oral argument, most of which is consumed by questions from the bench. The Court hears arguments from October through April. After argument, the justices meet in a private conference. The Chief Justice votes first, then each justice in order of seniority. The most senior justice in the majority assigns the opinion. A justice who agrees with the result but not the reasoning may write a concurrence; a justice on the losing side may write a dissent.12United States Courts. Supreme Court Procedures A tie vote leaves the lower court’s decision in place.
Supreme Court decisions bind every court in the country. When different circuits read the same federal statute in different ways, the Court often takes a case to resolve the split so the law means the same thing nationwide.
Specialized Federal Courts
Not every federal court fits the three-tier picture. Congress has created several courts with specialized jurisdiction. The U.S. Tax Court lets taxpayers challenge an IRS deficiency notice before paying the disputed tax, with a 90-day window to file a petition (150 days from abroad).13Office of the Law Revision Counsel. 26 U.S. Code 6213 – Restrictions Applicable to Deficiencies; Petition to Tax Court The U.S. Court of Federal Claims handles money claims against the federal government, including contract disputes, military and civilian pay claims, tax refund suits, Fifth Amendment takings cases, and vaccine injury compensation.14United States Court of Federal Claims. Court Info Bankruptcy courts operate as units within the district courts but are staffed by judges who serve 14-year terms. They are Article I courts, created under Congress’s legislative power rather than Article III, so their judges have more limited authority than district judges.15Congress.gov. Bankruptcy Courts as Adjuncts to Article III Courts
How Judges Get There and Stay There
Every Article III judge — from district court through the Supreme Court — is nominated by the President and confirmed by the Senate. The Senate Judiciary Committee holds hearings, questions the nominee, and votes on whether to send the nomination to the full Senate, where a simple majority confirms.16United States Senate. U.S. Senate Roll Call Votes 119th Congress – 2nd Session That single track distinguishes the federal system from state judiciaries, where judges may be elected, appointed by a governor, or selected through merit commissions depending on the state.5United States Courts. Comparing Federal and State Courts
Once confirmed, a federal judge serves for life under the “good Behaviour” clause. Involuntary removal requires impeachment: the House impeaches by simple majority, and the Senate convicts and removes only on a two-thirds vote.17United States Senate. About Impeachment
Judges who want to step back without fully retiring can take “senior status” under what is informally called the Rule of 80: a judge qualifies when age plus years of active service reach 80, so a judge at 65 with 15 years of service qualifies, as does a judge at 70 with 10.18United States Courts. FAQs: Federal Judges Senior judges keep hearing cases on a reduced schedule, which opens their seats for new appointments while keeping their experience available to the court.
Checks on the Judicial Branch and By It
Judicial review is the branch’s main check on the other two. When a federal court strikes down a statute or blocks an executive order, it keeps Congress and the President within their constitutional authority. The power reaches to protecting individual rights under the Bill of Rights even when majorities disagree with the outcome.
The other branches push back. The President picks who sits on the bench. The Senate confirms or rejects those picks. Congress controls the judiciary’s budget, sets the number of judgeships, and can restructure the lower courts. If a constitutional ruling cannot be reversed through ordinary legislation, Congress can propose a constitutional amendment, which is the one move that overrides a Supreme Court decision directly. Impeachment remains available for judges whose conduct falls below what “good Behaviour” demands, though it is rarely used.17United States Senate. About Impeachment
Inside the branch, precedent does its own work. Supreme Court decisions bind every court. Circuit decisions bind the district courts within that circuit. That hierarchy gives the law predictability: people, businesses, and lower courts can plan around settled interpretations rather than guessing where the law will land next.