Capacity means whether you have the legal ability to sue or be sued in court.
Capacity is the legal authority of a person or entity to participate in a lawsuit. It appears when a party challenges whether you can bring a case, for example, because of age, mental condition, or corporate status. A court will examine if you meet the legal requirements to stand as a party before the case proceeds.
If you lack capacity, the court may dismiss your case or prevent it from moving forward until a proper representative steps in. This can cause delays or even end the case entirely, so establishing capacity early is crucial.
Many confuse capacity with competence to testify or make medical decisions. Capacity in a legal proceeding is about your standing to sue or be sued, not your ability to understand the trial or make decisions during it.
Get the actual rule
This page explains the concept. When it matters to your case, read the rule that governs it in your court — we hold Texas, federal and Washington court rules word for word, and every state's official resources are on the state pages. If someone cites a case at you, check that it exists first.
Related
General explanation, not legal advice, and not specific to any state — procedures and deadlines vary by jurisdiction and court. If you can get a lawyer or free legal aid, do: every real option.