How to File a Lawsuit in 2026: Step-by-Step Guide for Civil Court

Filing a lawsuit is not as complicated as most people assume, but it requires getting a sequence of procedural steps right. Missing a deadline, serving the wrong person, or filing in the wrong court can get your case dismissed before a judge ever considers the merits. Understanding the full process from the moment you decide to sue through the final judgment helps you avoid the procedural mistakes that derail otherwise legitimate claims.

Before You File: Demand Letter and Settlement Attempt

Before spending money on filing fees and court time, send a formal demand letter to the party you intend to sue. A well-written demand letter states clearly what happened, what legal right was violated, exactly what you are demanding (usually a specific dollar amount or specific action), and a deadline for response. Many disputes resolve at this stage because defendants realize you are serious and that paying or settling costs less than defending a lawsuit.

Courts also look favorably on plaintiffs who attempted to resolve disputes before filing. Some courts require a certification that you attempted pre-litigation resolution. Even where not required, the demand letter creates a written record of the dispute's timeline, which can become evidence showing when the defendant knew about the claim. Keep a copy of the letter and any response you receive.

Choosing the Right Court

Court selection involves two questions: which court system has jurisdiction, and which specific court within that system is the right venue. Federal courts handle cases involving federal law, constitutional claims, disputes between citizens of different states where the amount exceeds $75,000, and certain specialized subject matters like patent and bankruptcy. State courts handle everything else, which is the vast majority of civil disputes including contracts, personal injury, landlord-tenant, and family law matters.

Within state courts, the division depends on the dollar amount of your claim. Small claims court handles the smallest disputes, typically up to $10,000-$25,000 depending on the state, with simplified procedures and no attorney requirement. General civil trial courts handle larger amounts. Check your state's specific thresholds before filing. Filing in small claims court when your claim exceeds the limit gets your case dismissed, and filing in superior court when small claims would suffice wastes your time and money on unnecessary procedures. Use our court fee calculator to understand filing costs for each court level in your state.

Drafting the Complaint

The complaint is the document that formally starts your lawsuit. It must identify the parties (plaintiff and defendant with their legal names and addresses), state the facts that support your claim in numbered paragraphs, identify the legal theories you are suing under (breach of contract, negligence, fraud, etc.), and state the specific relief you are requesting. Federal complaints must contain enough factual detail to make the claim plausible on its face, a standard established by the Supreme Court. State courts vary in how much detail they require.

For a breach of contract claim, you would allege that a valid contract existed, what each party's obligations were, that the defendant failed to perform their obligations, and that this failure caused you specific damages. For a negligence claim, you would allege that the defendant owed you a duty of care, that they breached that duty, that the breach caused your injury, and the damages that resulted. Each legal theory has its own required elements, and your complaint needs to address all of them.

Filing and Paying the Filing Fee

Once your complaint is drafted, you file it with the court clerk and pay the filing fee. Filing fees vary significantly by court and claim amount. A small claims filing might cost $30-$100. A general civil court filing can run $200-$500 or more. Federal court filing fees are $405 for most civil cases. If you cannot afford the filing fee, you can apply for a fee waiver (in forma pauperis in federal court, or the equivalent state program) by demonstrating financial need.

After filing, the court assigns your case a number and a judge. You receive a stamped copy of your complaint as proof of filing. The court may also issue a summons, a document that formally notifies the defendant that they have been sued and must respond within a specified time period, usually 20-30 days for state court and 21 days for federal court.

Serving the Defendant

After filing, you must properly serve the defendant with the complaint and summons. Service of process is the legal mechanism by which the court obtains jurisdiction over the defendant. Improper service is one of the most common reasons cases get thrown out early. Federal rules require personal service, service by leaving documents with someone of suitable age at the defendant's residence, or service on an authorized agent.

Individual defendants can generally be served by a professional process server, by a sheriff or marshal, or in some states, by certified mail with return receipt. Corporations must be served through their registered agent, an executive officer, or another authorized representative. Many states maintain databases of corporate registered agents. After service is completed, the server files proof of service with the court, and the defendant's deadline to respond begins running.

The Discovery Process

Discovery is the pre-trial phase where each side gathers evidence from the other. The main tools are interrogatories (written questions the other side must answer under oath), requests for production of documents, requests for admission, and depositions (oral examinations under oath before a court reporter). Discovery in federal court and major civil cases can be extensive and expensive, spanning months and generating thousands of pages of documents.

In smaller state court cases, discovery is often more limited. Some state courts have simplified discovery for cases below certain dollar amounts. Self-represented litigants are entitled to use all discovery tools available in their jurisdiction, though doing so effectively requires understanding the applicable rules. Discovery disputes, where one party refuses to produce requested information, can require motions to compel filed with the court.

Motions Practice and Trial

Between filing and trial, both sides typically file motions asking the court to make rulings on various issues. A motion to dismiss argues that even if all the plaintiff's allegations are true, there is no legal basis for the claim. A motion for summary judgment argues that there are no disputed facts requiring a trial and that one side should win as a matter of law. These motions can end cases without a trial.

If the case proceeds to trial, you will present evidence, call witnesses, and make legal arguments before a judge (bench trial) or jury. Civil trials are decided by a preponderance of the evidence standard, meaning you need to prove your case is more likely than not true. This is a lower standard than the criminal beyond-a-reasonable-doubt standard. Most civil cases settle before trial. Statistical estimates suggest 95% or more of civil lawsuits resolve before a verdict. For related context on litigation costs, see our guide on what it costs to sue someone and how to keep costs manageable with our guide to reducing court costs.