To countersue, you file a counterclaim as part of your written answer to the lawsuit against you. It is not a separate case. It is your own set of claims against the plaintiff, filed in the same court, on the same docket, usually in the same document as your answer. In federal court, that document is due within 21 days of being served with the summons and complaint, and if your counterclaim arises from the same events as the plaintiff’s lawsuit, filing it inside that window is not optional.1Legal Information Institute. Federal Rules of Civil Procedure Rule 12 – Defenses and Objections
Your Response Deadline Is Also Your Counterclaim Deadline
In federal court, you have 21 days after being served to file your answer.1Legal Information Institute. Federal Rules of Civil Procedure Rule 12 – Defenses and Objections If you waived formal service under Rule 4(d), that window extends to 60 days from when the plaintiff sent the waiver request, or 90 days if you were served outside the United States. There is no separate deadline for a counterclaim. It goes in the answer. Miss the answer deadline and you miss the counterclaim deadline too.
State courts set their own timelines. They often fall between 20 and 30 days but vary by jurisdiction and case type. Check your local court rules the day you are served, because the clock started when the papers were handed to you, not when you decided to read them.
If a claim against the plaintiff matures or you acquire it after you have already filed your answer, Rule 13(e) lets the court permit you to add it through a supplemental pleading.2Legal Information Institute. Federal Rules of Civil Procedure Rule 13 – Counterclaim and Crossclaim This requires a motion asking permission, so it is a safety valve, not a shortcut.
Compulsory or Permissive: The Distinction That Decides Everything
Federal Rule 13 splits counterclaims into two categories. Before you draft anything, you need to know which one you have.
A compulsory counterclaim is any claim you have against the plaintiff that arises out of the same transaction or occurrence as their lawsuit. If you have one, you must file it in your answer. If you don’t, you lose it permanently.2Legal Information Institute. Federal Rules of Civil Procedure Rule 13 – Counterclaim and Crossclaim Courts bar an unraised compulsory counterclaim from any future lawsuit under claim preclusion, sometimes called res judicata. The bar applies even if the original case ended in a default judgment because you did not show up. Two narrow exceptions exist: if the claim was already the subject of another pending lawsuit when the current action began, or if the plaintiff sued you through a process like attachment that did not establish personal jurisdiction and you choose to raise no counterclaim at all.
A permissive counterclaim is a claim against the plaintiff that does not arise from the same events. You can raise it in the current case or save it for a separate lawsuit. The flexibility comes with a jurisdictional catch: if your permissive counterclaim rests entirely on state law and the plaintiff’s case is in federal court, the federal court needs an independent basis to hear it, such as diversity of citizenship between you and the plaintiff. Federal courts can also exercise supplemental jurisdiction over related state-law claims, but that authority is discretionary and the court can decline it, particularly if the state-law issues are complex or would overshadow the original federal claim.3GovInfo. 28 USC 1367 – Supplemental Jurisdiction
The practical test for whether your claim is compulsory: does it grow out of the same events, contract, transaction, or incident as the lawsuit against you? If yes, treat it as compulsory and file it now. Getting this wrong in the direction of caution costs you nothing. Getting it wrong the other way costs you the claim.
A Counterclaim Is Not the Same as a Defense
Self-represented defendants confuse these constantly. Both appear in your answer, but they do different work.
An affirmative defense tries to defeat the plaintiff’s claim. You are arguing that even if everything the plaintiff alleges is true, you are not liable, because of something like the statute of limitations, consent, or comparative negligence. If the plaintiff drops the case, your affirmative defense disappears with it. It has no independent life.
A counterclaim is its own cause of action. You are asking the court to give you something from the plaintiff: money damages, an injunction, return of property. If the plaintiff dismissed their case tomorrow, your counterclaim would still go forward.
The test is simple. Does your filing ask the court for specific relief from the plaintiff? Then it is a counterclaim. Does it only try to reduce or eliminate your own liability? Then it is a defense. Mislabeling one as the other can cause the court to ignore it or treat it as waived.
What Goes in the Counterclaim
A counterclaim is a pleading, and it must meet the same standards as any complaint. Under Federal Rule of Civil Procedure 8, you need three things: a short, plain statement of the court’s jurisdiction if not already established; a short, plain statement of your claim showing you are entitled to relief; and a demand for the specific relief you want.4Legal Information Institute. Federal Rules of Civil Procedure Rule 8 – General Rules of Pleading The rule specifically says no technical form is required. Each statement just needs to be simple, concise, and direct.
In practice, your counterclaim document should:
- Label itself clearly in the caption as “Counterclaim” or “Answer and Counterclaim” so the court and opposing party know what they are reading.
- State the facts in numbered paragraphs, describing what happened and how the plaintiff’s conduct gives rise to your claims. You can reference facts from the original complaint where relevant.
- State each legal theory as a separate count. Breach of contract, negligence, fraud, whatever applies — each gets its own section.
- Demand the specific relief you want. A dollar amount, return of property, a court order requiring or prohibiting specific conduct.
Read the original complaint carefully before you draft. The plaintiff’s own factual allegations often contain admissions or details that support your counterclaim. Your denials, your affirmative defenses, and your counterclaim’s factual narrative all need to hang together. Contradictions among them will undermine your credibility with the judge.
Filing, Fees, and Serving the Other Side
Your counterclaim is filed together with your answer. Most federal courts and many state courts now require electronic filing through their own systems. Register on the platform and figure out how to use it before your deadline arrives, not the night the answer is due.p>
Filing fees vary. In federal district court, the base fee to initiate a civil action is $350, with administrative fees that push the total above $400.5Office of the Law Revision Counsel. 28 USC 1914 – District Court Filing and Miscellaneous Fees Whether a counterclaim triggers its own fee depends on the court and on whether the claim is compulsory or permissive. Many courts do not charge extra for a compulsory counterclaim filed with the answer. Permissive counterclaims, or claims filed later by supplemental pleading, may cost more. Ask the clerk’s office or check the court’s fee schedule.
After filing, serve the counterclaim on the plaintiff. In federal court, service methods include personal delivery and mail, among others.6Legal Information Institute. Federal Rules of Civil Procedure Rule 4 – Summons If the plaintiff has an attorney, service on the attorney is usually enough. If the plaintiff is unrepresented, follow your jurisdiction’s specific rules. A professional process server or the sheriff’s office can handle it and give you documentation of proper service.
Countersuing in Small Claims Court
If the lawsuit against you is in small claims court, the procedure is simpler but the rules are different. Most small claims courts allow counterclaims. You typically fill out a court form, file it with the clerk, and serve the plaintiff before the hearing. Deadlines are often short — sometimes as few as five days before the scheduled hearing, depending on the state.
The main constraint is the dollar cap. Small claims courts limit how much you can recover, and the cap varies by state, generally between $5,000 and $20,000. If your counterclaim exceeds the cap, the court may transfer the case to a higher court with broader jurisdiction, which means more formal procedure and higher costs on both sides. You can choose to waive the excess and keep the case in small claims, but you give up the right to recover anything above the limit.
Small claims courts expect self-represented parties. Bring organized documentation: contracts, photos, receipts, text messages. Be prepared to explain your counterclaim briefly. Judges hearing dozens of cases in a day do not have patience for disorganized presentations.
What Happens After You File
Once your counterclaim is served, the roles partly reverse. The plaintiff has to answer your counterclaim just as you had to answer their complaint. In federal court, that answer is due within 21 days.1Legal Information Institute. Federal Rules of Civil Procedure Rule 12 – Defenses and Objections The plaintiff can also file a motion to dismiss your counterclaim, arguing that it fails to state a valid claim, that the court lacks jurisdiction, or that service was improper. If the court grants that motion, your counterclaim can be dismissed before discovery.
If the plaintiff fails to respond at all, you can seek a default judgment on your counterclaim, the same way a plaintiff can when a defendant ignores a complaint. Federal Rule 55 specifically applies default judgment procedures to counterclaims.7Office of the Law Revision Counsel. Federal Rules of Civil Procedure Rule 55 – Default
As the case moves toward trial, both sides can use pre-trial motions. A motion for summary judgment argues that there is no genuine dispute of material fact and that one side is entitled to judgment without a trial; either party can file one on the counterclaim.8Legal Information Institute. Federal Rules of Civil Procedure Rule 56 – Summary Judgment A motion to sever asks the court to split the counterclaim off for a separate trial, which is more likely with a permissive counterclaim that turns on completely different facts than the plaintiff’s case.9Legal Information Institute. Federal Rules of Civil Procedure Rule 42 – Consolidation and Separate Trials
A credible counterclaim also changes settlement dynamics. A case that started as a one-sided demand for money from you becomes a two-way dispute with financial exposure on both sides. That shift is often the practical value of the counterclaim even when the case never reaches a verdict.
The Risks: Waived Claims and Sanctions
Two consequences are worth taking seriously before you file, and before you decide not to file.
The first is what you lose by skipping a compulsory counterclaim. Once the case goes to judgment, a compulsory counterclaim you never raised is barred from any future lawsuit under claim preclusion.2Legal Information Institute. Federal Rules of Civil Procedure Rule 13 – Counterclaim and Crossclaim The logic: if you could file a later lawsuit on the same events and effectively undo the first judgment, courts would never reach finality. So they close the door. By the time you notice the door is closed, it is too late to open it.
The second is what you risk by filing a counterclaim you cannot support. Under Federal Rule 11, every pleading carries an implicit certification that the claims have a reasonable basis in law and fact. If the court finds that your counterclaim lacked adequate legal or factual support, it can impose sanctions after giving you notice and a chance to respond.10Legal Information Institute. Federal Rules of Civil Procedure Rule 11 – Signing Pleadings, Motions, and Other Papers Sanctions are supposed to be limited to what is needed to deter the conduct, but the options include directives about future conduct, a monetary penalty paid to the court, or, if the opposing party requests, payment of some or all of the plaintiff’s attorney’s fees and expenses caused by the frivolous filing. A frivolous counterclaim also damages your standing with the judge, which affects every other argument you make in the case.
A Note for Self-Represented Defendants
If you are filing without an attorney, start with your court’s resources for self-represented litigants. Many federal and state courts publish forms, filing instructions, and links to local rules. The clerk’s office can answer procedural questions about where to file, what forms to use, and what fees apply. Clerks cannot give legal advice, but they can keep you from missing something mechanical.
A few mistakes to avoid. Do not merge your affirmative defenses and your counterclaim; the counterclaim must request specific relief. Do not wait until the last day of your response deadline to learn the e-filing system. Do not assume the judge will see what seems obvious to you — spell out each element of each claim in the pleading itself. If the amount at stake justifies the cost, even a short consultation with an attorney can help you confirm whether your claim is compulsory, whether your legal theories hold up, and whether your pleading meets the court’s requirements.