Subject matter jurisdiction

Subject-matter jurisdiction is the authority of a court to hear cases of a particular type or cases relating to a specific subject matter. For instance, bankruptcy court only has the authority to hear bankruptcy cases.

Subject-matter jurisdiction must be distinguished from personal jurisdiction, which is the power of a court to render a judgment against a particular defendant, and territorial jurisdiction, which is the power of the court to render a judgment concerning events that have occurred within a well-defined territory. Unlike personal or territorial jurisdiction, lack of subject-matter jurisdiction cannot be waived. A judgment from a court that did not have subject-matter jurisdiction is forever a nullity.

To decide a case, a court must have a combination of subject (subjectam) and either personal (personam) or territorial (locum) jurisdiction.

Subject-matter jurisdiction, personal or territorial jurisdiction, and adequate notice are the three most fundamental constitutional requirements for a valid judgment.

In the United States, many state court systems are divided into divisions such as criminal, civil law, family, and probate. A court within any one of those divisions would lack subject-matter jurisdiction to hear a case regarding matters assigned to another division. Most U.S. state court systems, however, include a superior court that has "general" jurisdiction; that is, it is competent to hear any case over which no other state court has exclusive jurisdiction. Because the United States federal courts have exclusive jurisdiction over a very small percentage of cases, such as copyright disputes, patent disputes, and United States bankruptcy court disputes, state courts have the authority to hear the vast majority of cases.

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