The person who files a lawsuit is called the plaintiff. That’s the standard term in civil cases, though the same role goes by a different name in certain proceedings. Whatever the label, the job is the same: one party brings a dispute to court, explains the harm, and asks a judge for a remedy.1Legal Information Institute. Plaintiff
Plaintiff, Petitioner, or Complainant
Most civil lawsuits start with a plaintiff filing a complaint. The complaint lays out the facts, identifies the harm, names the defendant, and asks the court for money, an order to stop certain conduct, or some other form of relief.
In other proceedings, the filing party is a petitioner. Petitions are how cases typically start in family law (including divorce), probate, guardianship, bankruptcy, and name changes. The split is largely historical. Complaints tend to involve money damages or clearly adversarial fights; petitions ask the court for a specific ruling or approval.2Legal Information Institute. Petitioner
A third term, complainant, is used in administrative and regulatory settings. Someone filing a workplace discrimination charge with the EEOC or a complaint before a professional licensing board is a complainant rather than a plaintiff.3Legal Information Institute. Complainant
In a class action, the people whose names appear on the lawsuit are class representatives. They file on behalf of a larger group of people who suffered the same type of harm from the same defendant.4Legal Information Institute. Federal Rules of Civil Procedure Rule 23 – Class Actions
What You Need Before a Court Will Hear You
Being upset with someone isn’t enough. Courts require three things, and missing any one of them can get a case thrown out before a judge ever considers the merits.
Standing
Standing means you personally have a stake in the outcome. The Supreme Court’s three-part test asks whether you suffered a concrete injury, whether that injury traces back to the defendant’s conduct, and whether a court ruling in your favor can actually fix or compensate for the harm.5Constitution Annotated. ArtIII.S2.C1.6.1 Overview of Standing You generally can’t sue over a hypothetical future harm, and you can’t sue over someone else’s injury unless a specific legal relationship gives you that right.
Capacity
Capacity is about whether you are legally able to bring a case on your own. Adults of sound mind have it. Minors and people who have been declared legally incompetent generally do not, but they are not shut out. A parent, guardian, conservator, or court-appointed representative can file for them, and if no representative exists, the court can appoint a guardian ad litem to protect their interests during the case.6Legal Information Institute. Federal Rules of Civil Procedure Rule 17 – Plaintiff and Defendant; Capacity; Public Officers
Jurisdiction
The court you choose has to have authority over the dispute. Two separate ideas have to line up. Subject matter jurisdiction means the court is the right type for your kind of case. Federal courts hear cases involving federal law, constitutional questions, and disputes between residents of different states above a dollar threshold. State courts handle most everything else. Personal jurisdiction means the court has authority over the defendant, which usually requires that the defendant lives, works, or does business in the court’s area.7Legal Information Institute. Subject Matter Jurisdiction
The Deadline Problem
Every type of lawsuit comes with a statute of limitations. Miss it, and the defendant can ask the court to dismiss your case no matter how strong the evidence is. The clock usually starts on the date of the injury or the date you discovered (or should have discovered) the harm.
Federal statutes set their own windows. Tort claims against the federal government, for example, must be filed within two years.8Office of the Law Revision Counsel. 28 USC 2401 – Time for Commencing Action Against United States State deadlines vary with the type of claim. Personal injury claims generally run one to six years. Breach of contract runs three to fifteen years, with written contracts getting longer windows than oral ones. Property damage sits around three years in most states.
One important wrinkle. The statute of limitations is typically an affirmative defense, which means the defendant has to raise it. Courts do not automatically check whether you filed on time. But once a defendant raises it, a time-barred claim is almost always dead. If you are anywhere near a deadline, that alone is reason enough to act now.
Steps Before Filing
Walking straight to the courthouse is not always possible, and even when it is, some preparation makes a real difference.
Exhausting Administrative Remedies
Some claims require you to go through a government agency first. Employment discrimination is the clearest example. Before suing under federal anti-discrimination law, you have to file a charge with the EEOC (or the state equivalent) and let the agency investigate. Skipping that step gets your case dismissed for failure to exhaust administrative remedies. Similar rules apply to many disputes with government agencies, workers’ compensation claims, and tax matters.
Demand Letters
A written demand to the other side is often either legally required or strategically useful. Some contracts require written notice before litigation. Construction defect, medical malpractice, and insurance claims have mandatory pre-suit notice rules in many states. Even where no rule applies, a demand letter can settle the dispute without the cost of a lawsuit, and it shows the court you tried to resolve things.
Gathering Evidence
Before drafting anything for the court, pull together the contracts, emails, photographs, medical records, receipts, and witness contacts that support your claim. Identify the legal theory the case will rest on. A consultation with an attorney at this stage often pays for itself, because picking the wrong theory or the wrong court can waste months.
Filing the Complaint
The complaint is the document that officially starts the case. It has to do three things: tell the court why it has jurisdiction, describe what the defendant did and how it harmed you, and spell out what you want the court to order.9United States Courts. Civil Cases You don’t have to prove the case at this stage, but you need enough factual detail for the defendant to understand the accusations and for the court to see a plausible claim.
Once drafted, you file the complaint with the clerk of the appropriate court and pay a filing fee. The federal district court filing fee totals $405.10Office of the Law Revision Counsel. 28 USC 1914 – District Court; Filing and Miscellaneous Fees State court fees vary widely by jurisdiction and case type. The clerk stamps your documents and assigns a case number, and you are officially in litigation.
If you cannot afford the fee, you can ask the court to proceed “in forma pauperis.” You submit an affidavit of your income and assets showing you genuinely cannot pay. The waiver covers filing and docketing fees but not other litigation costs like copying, mailing, or service.11Office of the Law Revision Counsel. 28 USC 1915 – Proceedings In Forma Pauperis
Serving the Defendant
Filing the complaint does not tell the defendant anything. You have to formally deliver copies of the complaint and a court summons to the other side, a process called service. Notice has to be reasonably calculated to inform the defendant of the case and give them a chance to respond.12Legal Information Institute. Service of Process
In federal court, you have 90 days after filing to complete service. Miss that window and the court can dismiss without prejudice, meaning you can refile but you lose whatever time has passed on the statute of limitations clock.13United States Courts. Federal Rules of Civil Procedure State rules and deadlines differ, but the consequence of botching service is the same everywhere: delay, added cost, and possible dismissal.
Once the defendant is properly served, their response clock starts. In federal court, a defendant has 21 days to file an answer or a motion to dismiss. If the defendant waived formal service, which the plaintiff can request as a cost-saving step, the deadline extends to 60 days.14Legal Information Institute. Federal Rules of Civil Procedure Rule 12 – Defenses and Objections; When and How Presented The response may admit or deny your allegations, raise defenses, or include counterclaims against you.
Filing Without a Lawyer
You do not need a lawyer. Federal law gives every person the right to appear “pro se,” representing themselves in court, and state courts recognize the same right.15Office of the Law Revision Counsel. 28 USC 1654 – Appearance Personally or by Counsel
Courts hold pro se litigants to the same procedural rules as attorneys, though. You still have to meet filing deadlines, follow the evidence rules, and format documents correctly. Judges may be lenient on small technicalities, but they will not walk you through the process. Straightforward small claims disputes often work fine without counsel. Complex cases, large amounts of money, or an opposing side with its own lawyer usually justify hiring one. Many attorneys offer free or low-cost initial consultations, and some take cases on contingency, collecting a fee only if you win.