What Is a Counterclaim? Definition, Examples, and How to File

A counterclaim is a claim for relief filed by the defendant against the plaintiff in the same lawsuit. It allows a defendant to assert their own legal grievance arising from (or related to) the same dispute, instead of filing a separate suit. Federal Rule of Civil Procedure Rule 13 divides counterclaims into two categories: compulsory counterclaims, which arise out of the same transaction or occurrence and must be raised in the same case (or be lost forever), and permissive counterclaims, which are unrelated and may be raised in the same case at the defendant's option.

This guide explains how counterclaims operate procedurally, the compulsory-vs-permissive distinction that controls whether the defendant must plead now or be barred later, the deadline rules under FRCP 12 and 13, the differences from crossclaims and third-party claims, drafting requirements, and how plaintiffs respond. For drafting examples, see our counterclaim examples post And our sample counterclaim template.

How a Counterclaim Operates Procedurally

A counterclaim is filed as part of the defendant's answer to the complaint and is captioned within the same case number. It is not a separate lawsuit. The plaintiff who filed the original complaint becomes a counterclaim defendant; the defendant who filed the counterclaim becomes a counterclaim plaintiff. The court retains jurisdiction over both the original claim and the counterclaim, and both proceed through discovery, motion practice, and trial together.

The procedural advantages are significant. The defendant pays no additional filing fee for the counterclaim itself. Discovery is consolidated, witnesses testify once, and a single jury (or judge in a bench trial) resolves both claims. The court can offset the recoveries: if the plaintiff prevails on a $40,000 contract claim and the defendant prevails on a $25,000 counterclaim, the net judgment is $15,000 for the plaintiff. This consolidation is one of the principal efficiencies that compulsory-counterclaim rules were designed to capture.

The same procedural rules that govern complaints govern counterclaims. The pleading must satisfy FRCP 8(a)'s notice-pleading standard, must be plausible under Bell Atlantic Corp. V. Twombly And Ashcroft v. Iqbal, and must comply with whatever heightened pleading standards apply to specific causes of action (FRCP 9(b) for fraud, FRCP 9(g) for special damages). A counterclaim that fails these standards is subject to dismissal under FRCP 12(b)(6), the same as any other claim.

Compulsory vs Permissive Counterclaims

The single most important distinction in counterclaim practice is between compulsory and permissive counterclaims. The distinction is not merely classificatory, it controls whether the defendant must plead the claim now or face permanent forfeiture.

Compulsory counterclaims (FRCP 13(a)). A counterclaim is compulsory if it arises out of the same transaction or occurrence as the plaintiff's claim and does not require adding a party over whom the court cannot acquire jurisdiction. The 'same transaction or occurrence' test is fact-intensive; most circuits use a 'logical relationship' test that asks whether the claims are sufficiently intertwined that judicial economy favors a single proceeding.

A defendant who fails to assert a compulsory counterclaim in the original action loses the right to bring it later. This forfeiture, sometimes called the compulsory counterclaim bar, is rooted in res judicata principles and is sometimes treated as a separate doctrine of waiver. The bar applies whether the original case ends in judgment, settlement, or dismissal with prejudice.

Two narrow exceptions exist. First, the rule does not require pleading a counterclaim if at the time of the original answer the claim was the subject of another pending action. Second, FRCP 13(a)(2)(B) excuses pleading where the original action was based on quasi in rem or in rem jurisdiction and the defendant did not assert a counterclaim under Rule 13.

Permissive counterclaims (FRCP 13(b)). A counterclaim is permissive if it does not Arise out of the same transaction or occurrence. The defendant may raise the claim in the same action or in a separate suit, at the defendant's strategic option. Permissive counterclaims raise an independent subject matter jurisdiction question because they cannot ride on supplemental jurisdiction under 28 U.S.C. Section 1367 unless they share a common nucleus of operative fact (which would arguably make them compulsory anyway). See our explainer on subject matter jurisdiction.

Deadline to File a Counterclaim

The deadline tracks the deadline for the answer. Under FRCP 12(a), a defendant who has been served with a summons and complaint must serve an answer within 21 days (60 days for service on the United States or its officers). Where the defendant has filed a Rule 12 motion (motion to dismiss, motion for more definite statement), the answer is due within 14 days after notice of the court's action on the motion.

The counterclaim is incorporated into the answer and is therefore due on the same date. Defendants who realize after answering that they should have asserted a counterclaim may seek leave to amend under FRCP 15(a). The court will freely grant leave when justice so requires, but late counterclaims face increased scrutiny if the plaintiff can demonstrate prejudice or undue delay.

Drafting a Counterclaim

A counterclaim should follow the same structural conventions as a complaint, even though it is filed within the answer:

• Caption. The case caption is the same as the original case, but the defendant is now also styled as 'Counterclaim Plaintiff' and the plaintiff as 'Counterclaim Defendant.'
• Heading. A clear heading identifies the section as 'Counterclaim' or 'Counterclaim Against Plaintiff.'
• Jurisdictional allegations. If the counterclaim relies on supplemental jurisdiction, the pleading should so state. Permissive counterclaims must allege independent jurisdiction.
• Factual allegations. Numbered paragraphs setting out the relevant facts, often incorporating by reference allegations from the answer or original complaint.
• Counts (causes of action). Each legal theory in a separately captioned count, with the elements of the cause of action and supporting allegations.
• Prayer for relief. The counterclaim plaintiff's specific request: damages, injunctive relief, declaratory relief, attorney's fees if authorized.
• Signature block. Same as the answer.

The counterclaim must be pleaded with the same specificity as a complaint. Conclusory allegations of breach, fraud, or interference will not survive a Rule 12(b)(6) motion. Defendants should resist the temptation to draft a thin counterclaim as use; courts increasingly dismiss such claims with prejudice and award fees under Rule 11.

Plaintiff's Response: Reply to Counterclaim

The plaintiff (now 'counterclaim defendant') must file a reply to the counterclaim, also called an answer to the counterclaim. The reply is due within 21 days under FRCP 12(a)(1)(B) (or 60 days if the United States is the counterclaim defendant). The reply must respond to each numbered paragraph of the counterclaim, admit or deny each allegation, and assert any affirmative defenses.

The plaintiff may also move to dismiss the counterclaim under FRCP 12(b) on any of the standard grounds (lack of jurisdiction, failure to state a claim, statute of limitations, etc.). A successful Rule 12(b)(6) motion against a counterclaim eliminates the defendant's claim while leaving the original complaint intact for adjudication. Our guide on the motion to dismiss filing Covers the procedural mechanics in detail.

If the plaintiff fails to reply to the counterclaim within the deadline, the defendant may seek a default judgment on the counterclaim. Default judgments on counterclaims are uncommon but procedurally identical to default judgments on complaints, including the requirement that the defendant prove damages.

Strategic Reasons to File a Counterclaim

Defendants file counterclaims for several distinct strategic purposes:

• Recovery of independent damages. The most direct purpose. The defendant believes the plaintiff has injured it and wants compensation.
• Offset of plaintiff's claim. A successful counterclaim reduces or eliminates any judgment for the plaintiff.
• Settlement use. A credible counterclaim changes the negotiating dynamic. Plaintiffs facing the prospect of paying out on the counterclaim may settle for less or even drop the original claim.
• Procedural compulsion. If the claim is compulsory, the defendant must File it now or lose it forever. Strategic considerations are secondary to this requirement.
• Forum advantage. The plaintiff has chosen the forum. Filing a counterclaim there may be cheaper than starting fresh elsewhere.
• Discovery efficiency. Discovery has already begun. Adding the counterclaim uses that work.

If you need a counterclaim drafted, our attorney-drafted counterclaim service starts at $899 with seven-day delivery. The drafting attorney will analyze whether your claim is compulsory or permissive, draft the operative counterclaim, ensure compliance with FRCP 13 and any applicable local rules, and integrate the counterclaim into your answer. Order an attorney-drafted counterclaim Or use our free counterclaim template.

Frequently Asked Questions

What is the meaning of counterclaim?

A counterclaim is a claim for relief filed by the defendant against the plaintiff in the same lawsuit. It is most commonly a claim by the defendant against the plaintiff arising out of the same dispute or transaction. The procedural mechanism is governed by Federal Rule of Civil Procedure 13, which divides counterclaims into compulsory (must be raised now or be lost) and permissive (may be raised at the defendant's option) categories. Filing a counterclaim does not require a separate complaint or filing fee, the claim is asserted within the answer.

What happens if you don't file a compulsory counterclaim?

A defendant who fails to file a compulsory counterclaim under FRCP 13(a) loses the right to bring that claim in any later lawsuit. The doctrine of res judicata (claim preclusion) bars a later action on the same transaction or occurrence. The penalty is severe and not curable, which is why defense counsel must analyze every related claim against the plaintiff before filing the answer and assert any compulsory counterclaim within the answer itself.

What best describes a counterclaim?

A counterclaim is most accurately described as a claim for relief filed by a defendant against a plaintiff within the same lawsuit. It is the legal mechanism by which the defendant asserts that the plaintiff has wronged the defendant, in addition to (or in response to) the wrongs the plaintiff has alleged against the defendant. Casual usage sometimes uses 'counterclaim' to mean any opposing argument or counter-position; in legal practice, the term is reserved for a formal pleading filed under FRCP 13 or its state-court equivalent.

What is the difference between a counterclaim and an affirmative defense?

An affirmative defense defeats or limits the plaintiff's claim without seeking independent relief, while a counterclaim is a separate cause of action that asks the court to grant the defendant relief against the plaintiff. Affirmative defenses appear in the answer's defenses section and include statute of limitations, accord and satisfaction, and contributory negligence. A counterclaim seeks money damages, an injunction, or other affirmative relief.