The federal court system, explained at its simplest, runs on three tiers: 94 U.S. district courts try cases, 13 U.S. courts of appeals review the trial rulings for legal error, and the U.S. Supreme Court sits above both as the final authority on federal law and the Constitution. Article III of the Constitution created this independent judiciary so federal law would be read the same way nationwide, and roughly 865 authorized Article III judgeships staff the structure. A handful of specialized courts sit alongside the main pipeline to handle technical areas like bankruptcy, tax, international trade, and veterans’ benefits.
What Kinds of Cases Belong in Federal Court
Federal courts are courts of limited jurisdiction. They can hear only the categories of cases spelled out in Article III, Section 2. Two doors get most litigants in.
The first is federal question jurisdiction. If a claim rests on the Constitution, a federal statute, or a U.S. treaty, a federal court can hear it. Civil rights suits, federal criminal prosecutions, patent cases, and challenges to federal regulations all qualify. Who the parties are doesn’t matter.
The second is diversity jurisdiction, which applies to disputes between citizens of different states. Two conditions must be met: every plaintiff has to be a citizen of a different state than every defendant, and the amount in controversy must exceed $75,000.1Office of the Law Revision Counsel. 28 USC 1332 – Diversity of Citizenship; Amount in Controversy; Costs The point is neutral ground: a New York resident sued in Texas state court can, in theory, be disadvantaged by a hometown forum. Citizenship here means domicile, not just where someone currently lives.
Federal courts also handle admiralty and maritime cases, disputes involving foreign ambassadors, and lawsuits between state governments. These categories keep matters with national or international stakes out of any single state’s courts.
A case that qualifies for federal jurisdiction but was filed in state court can often be moved. A defendant has 30 days from receiving the complaint to file a notice of removal.2Office of the Law Revision Counsel. 28 USC 1446 – Procedure for Removal of Civil Actions For diversity-based cases, removal is blocked if any defendant is a citizen of the state where the suit was filed, and there’s a one-year outer limit from when the case began.
U.S. District Courts: Where Cases Start
Nearly every federal case begins in a U.S. district court. These are the trial courts. Witnesses testify, evidence comes in, juries render verdicts, and judges rule on the law. There are 94 judicial districts, with at least one in every state, plus the District of Columbia and four U.S. territories (Puerto Rico, the Virgin Islands, Guam, and the Northern Mariana Islands).3United States Courts. About U.S. District Courts Larger states are split into several districts; Texas and New York each have four. Smaller states have one.
The system authorizes 677 district court judgeships.4United States Courts. Status of Article III Judgeships – Judicial Business 2025 District judges handle both civil and criminal matters, from drug trafficking prosecutions to multimillion-dollar contract fights. Most federal litigation ends here. Trials, settlements, plea agreements, and dismissals resolve the bulk of cases without any appeal.
District judges are joined by magistrate judges, who are appointed by the district court judges they work alongside for renewable eight-year terms. Magistrate judges issue warrants, conduct arraignments, handle pretrial matters, and can try misdemeanor cases when the defendant consents.5United States Courts. Types of Federal Judges
U.S. Courts of Appeals: The Middle Tier
A party who believes the district court got the law wrong appeals to the U.S. Court of Appeals for the circuit covering that district. There are 13 circuits: 12 cover defined geographic regions, and the Federal Circuit hears specialized nationwide appeals in patent cases, international trade, and government contract claims.6United States Courts. About U.S. Courts of Appeals The system authorizes 179 appellate judgeships.4United States Courts. Status of Article III Judgeships – Judicial Business 2025
Appeals courts don’t retry cases. No new witnesses. A panel of three judges reads the trial record, hears oral argument, and decides whether the lower court applied the law correctly. The panel’s decision binds every district court in that circuit, which is how legal interpretation stays reasonably uniform within a region. Different circuits can and do reach opposite conclusions on the same legal question, and those splits are one of the main reasons the Supreme Court agrees to step in.
Occasionally the full bench of a circuit rehears a case instead of leaving it to the three-judge panel. This is en banc review, and it isn’t granted casually. A majority of the circuit’s active judges must vote for it, and the case has to conflict with prior circuit or Supreme Court precedent, conflict with another circuit, or raise a question of exceptional importance.7Legal Information Institute. Federal Rules of Appellate Procedure Rule 40 – Panel Rehearing; En Banc Determination An en banc decision carries more weight than a panel decision because it represents the whole circuit.
The U.S. Supreme Court
The Supreme Court is the final word on the meaning of federal law and the Constitution. Its nine justices bind every federal and state court in the country. And unlike the courts beneath it, the Court largely controls its own docket. It receives roughly 7,000 petitions a year and agrees to hear only about 100 to 150.8United States Courts. Supreme Court Procedures
Most cases arrive by writ of certiorari, a formal request that the Court review a lower court’s decision. There is no right to Supreme Court review. At least four of the nine justices must vote to grant cert, a convention known as the rule of four. The Court tends to take cases where the circuits have split or where a constitutional question is unusually significant.
A narrow category of cases can be filed directly with the Supreme Court. Article III gives it original jurisdiction over cases involving foreign ambassadors and disputes where a state is a party.9Legal Information Institute. Constitution Annotated – Article III, Section 2, Clause 2 – Original Jurisdiction In practice, the Court uses this power sparingly. Border disputes between states are the most common example.
Specialized Federal Courts
Not every federal case belongs in the general trial-appeal-Supreme Court pipeline. Several specialized courts handle technical areas that benefit from focused judicial expertise.
Bankruptcy Courts
Bankruptcy courts operate as units of the district courts, and every one of the 94 districts has one. They handle debt relief, asset distribution, and creditor claims.3United States Courts. About U.S. District Courts Bankruptcy judges aren’t Article III judges. The circuit courts of appeals appoint them for 14-year terms.10Office of the Law Revision Counsel. 28 USC 152 – Appointment of Bankruptcy Judges
Tax Court
The U.S. Tax Court lets a taxpayer challenge an IRS deficiency determination before paying the disputed amount. If you receive a Notice of Deficiency (also called a 90-day letter), you have 90 days from the date on the notice to file a petition, or 150 days if you’re outside the country.11Internal Revenue Service. Understanding Your CP3219N Notice In most other tax disputes, you’d have to pay first and then sue for a refund in district court.
Court of International Trade
The Court of International Trade has exclusive jurisdiction over civil suits against the United States involving import revenue, tariffs, duties, and other customs matters.12Office of the Law Revision Counsel. 28 USC 1581 – Civil Actions Against the United States and Agencies and Officers Thereof It sits in New York City but its jurisdiction is nationwide, and appeals go to the Federal Circuit.
Court of Federal Claims
Monetary claims against the federal government (contract disputes, takings of private property, certain tax refund claims) typically go to the Court of Federal Claims. For claims over $10,000, this court has exclusive jurisdiction. Claims at or below $10,000 can also be filed in a district court.13Office of the Law Revision Counsel. 28 USC 1346 – United States as Defendant Tort claims against the government require a preliminary step: you first file an administrative claim with the responsible agency and wait for a written denial or for six months to pass, whichever comes first.14eCFR. Administrative Claims Under Federal Tort Claims Act
Foreign Intelligence Surveillance Court
The FISA Court reviews government applications for national-security surveillance warrants, and it operates largely in secret. The Chief Justice designates 11 federal district judges from at least seven different circuits to serve, each for a maximum of seven years without redesignation.15Office of the Law Revision Counsel. 50 USC 1803 – Designation of Judges
Military and Veterans Courts
Two Article I courts serve service members and veterans. The U.S. Court of Appeals for the Armed Forces has worldwide appellate jurisdiction over people subject to the Uniform Code of Military Justice; five civilian judges appointed by the President with Senate confirmation serve 15-year terms. The U.S. Court of Appeals for Veterans Claims has exclusive jurisdiction to review decisions of the Board of Veterans’ Appeals, including denied or reduced disability benefits.16Office of the Law Revision Counsel. 38 USC 7252 – Jurisdiction; Finality of Decisions Appeals from both flow to the Federal Circuit.
How Federal Judges Are Appointed and How Long They Serve
The Article III appointment process is deliberately rigorous. The President nominates, and the Senate confirms by majority vote. Once confirmed, Article III judges hold their seats for life during “good behavior,” a constitutional protection that shields them from political pressure. There’s no reelection, no losing the job over an unpopular ruling. The only way to remove an Article III judge is impeachment by the House and conviction by the Senate, which has happened fewer than 20 times in American history.5United States Courts. Types of Federal Judges
Article III judges don’t have to choose between full-time work and full retirement. Under the informal “Rule of 80,” a judge whose age plus years of federal judicial service equal at least 80 may take senior status. The sliding scale starts at age 65 with 15 years of service and reaches age 70 with 10 years.17Office of the Law Revision Counsel. 28 USC 371 – Retirement on Salary; Retirement in Senior Status Senior judges keep hearing cases on a reduced schedule at full salary, which eases caseloads and opens a seat for a new appointment.
Not every federal judge has a lifetime appointment. Bankruptcy judges serve 14-year terms and are appointed by the courts of appeals. Magistrate judges serve renewable eight-year terms and are appointed by the district judges of their court.5United States Courts. Types of Federal Judges These positions carry real judicial authority but sit outside Article III’s tenure protections.