Counterclaims and Crossclaims

Counterclaims and Crossclaims

A civil lawsuit does not always consist of one plaintiff making claims against one defendant. Once litigation begins, the defendant may have a claim against the plaintiff, one defendant may have a claim against another defendant, or a party may need to assert a related claim arising from the same dispute.

Federal civil procedure provides mechanisms for handling these situations within the existing lawsuit. The two most important are counterclaims and crossclaims.

A counterclaim is a claim brought by a defendant against the plaintiff, or by another party against an opposing party in circumstances authorized by the Federal Rules. A crossclaim is generally a claim brought by one party against a co-party on the same side of the litigation, such as one defendant against another defendant.

The distinction matters because the Federal Rules treat counterclaims and crossclaims differently. Counterclaims may be compulsory or permissive, while crossclaims under Rule 13(g) generally must arise out of the same transaction or occurrence as the original action or a counterclaim and may include claims concerning related property.

The principal federal rule is Federal Rule of Civil Procedure 13, which governs counterclaims and crossclaims. Federal Rule of Civil Procedure 13 should therefore be read together with Rules 14, 15, 18, and 20 when analyzing additional claims and parties.

Understanding counterclaims and crossclaims is essential because they determine not only who can sue whom within an existing case, but also when a party must assert a claim or risk losing the opportunity to litigate it later.

What Is a Counterclaim?

A counterclaim is a claim asserted against an opposing party within an existing lawsuit.

The most common example is a defendant asserting a claim against the plaintiff.

Suppose:

• A plaintiff sues a defendant for breach of contract.
• The defendant contends that the plaintiff also breached the same contract.
• The defendant asserts a claim against the plaintiff for damages.

That claim is a counterclaim.

The defendant is no longer merely responding to the plaintiff’s allegations. The defendant is asserting an affirmative claim for relief of its own.

This distinction is important.

An answer says, in substance:

“The plaintiff should not win.”

A counterclaim says:

“The plaintiff should not only lose; the defendant should obtain relief against the plaintiff.”

A counterclaim can therefore transform the litigation into a dispute involving claims in both directions.

---

What Is a Crossclaim?

A crossclaim is a claim asserted by one party against a co-party.

The classic situation involves multiple defendants.

For example:

• Plaintiff sues Defendant A and Defendant B.
• Defendant A alleges that Defendant B is responsible for the harm.
• Defendant A asserts a claim against Defendant B.

That claim may be a crossclaim.

Crossclaims can also arise among multiple plaintiffs.

For example:

• Plaintiff A and Plaintiff B sue Defendant C.
• Plaintiff A asserts a claim against Plaintiff B arising from the same transaction.

That may constitute a crossclaim.

The critical distinction is therefore the relationship between the parties.

Counterclaim

Generally:

Defendant → Plaintiff

Crossclaim

Generally:

Party → Co-party

This distinction is foundational to Rule 13.

---

The Federal Rule Governing Counterclaims and Crossclaims

Rule 13 contains separate provisions governing counterclaims and crossclaims.

Rule 13(a) addresses compulsory counterclaims.

Rule 13(b) addresses permissive counterclaims.

Rule 13(g) addresses crossclaims.

Rule 13(h) also addresses joining additional parties to counterclaims and crossclaims.

The complete rule is available through Cornell Law School’s Federal Rule of Civil Procedure 13.

Because counterclaims and crossclaims involve additional claims, other Federal Rules may also become important, particularly:

• Rule 8;
• Rule 12;
• Rule 15;
• Rule 18;
• Rule 19;
• Rule 20;
• Rule 21; and
• Rule 42.

The rules work together rather than operating independently.

---

Compulsory Counterclaims

The most important distinction in counterclaim practice is between compulsory and permissive counterclaims.

Under Rule 13(a), a counterclaim is generally compulsory when it:

1. arises out of the transaction or occurrence that is the subject matter of the opposing party’s claim; and
2. does not require adding another party over whom the court cannot acquire jurisdiction.

This rule creates a powerful procedural consequence.

A compulsory counterclaim generally must be asserted in the current action.

If the defendant fails to assert a compulsory counterclaim, the defendant may later be barred from bringing that claim in a separate lawsuit, subject to applicable exceptions and jurisdictional considerations.

The rule therefore serves both efficiency and finality.

---

The Transaction-or-Occurrence Test

The central question in determining whether a counterclaim is compulsory is whether it arises out of the same transaction or occurrence as the opposing party’s claim.

The Federal Rules do not provide a single mathematical formula for deciding this question.

Courts commonly consider factors such as:

• whether the claims involve substantially the same facts;
• whether substantially the same evidence will be required;
• whether the claims are logically related;
• whether resolving the claims together promotes judicial efficiency; and
• whether separate lawsuits would involve substantial duplication of evidence or proceedings.

The precise formulation varies among jurisdictions.

The basic idea is that claims arising from the same underlying dispute generally belong in the same litigation.

---

Example of a Compulsory Counterclaim

Suppose a construction company sues a homeowner for failure to pay $50,000 under a renovation contract.

The homeowner claims that the contractor failed to perform the agreed work.

The contractor responds that the homeowner owes $50,000.

The homeowner also believes that the contractor breached the same contract by performing defective work and seeks $30,000 in damages.

The homeowner’s claim is closely connected to the same contract, performance, and underlying transaction.

It is therefore a strong example of a potential compulsory counterclaim.

The law generally favors resolving both sides of the contractual dispute in one lawsuit rather than requiring separate litigation concerning the same project and evidence.

---

Why Compulsory Counterclaims Matter

The compulsory-counterclaim rule serves several purposes.

First, it promotes judicial economy.

If two claims arise from the same dispute, trying them together can prevent duplication.

Second, it protects defendants from having to participate in multiple lawsuits concerning the same underlying transaction.

Third, it promotes finality.

A lawsuit should ordinarily resolve the connected claims between the parties rather than leaving substantial parts of the dispute for later litigation.

Fourth, it reduces the risk of inconsistent results.

Two different courts hearing closely connected claims might otherwise reach conflicting conclusions concerning the same underlying facts.

---

What Happens If a Compulsory Counterclaim Is Omitted?

A party that fails to assert a compulsory counterclaim may face a significant consequence: preclusion from asserting the claim later.

The precise doctrine depends on the circumstances and applicable law, but the underlying principle is straightforward.

If a claim was required to be brought as a counterclaim in the existing action, the party should not ordinarily be permitted to split the dispute into separate lawsuits.

For that reason, identifying potential compulsory counterclaims early in litigation is extremely important.

A defendant should not assume that a claim against the plaintiff can always be saved for another lawsuit.

---

Exceptions to the Compulsory-Counterclaim Rule

Rule 13(a) contains important qualifications.

For example, a party generally is not required to assert a claim if, at the time the action was commenced, the claim was already the subject of another pending action.

The rule also addresses situations involving parties that cannot be joined because the court lacks jurisdiction over them.

Other statutory or procedural circumstances can affect whether a claim must be asserted.

Therefore, the statement that “every related claim is compulsory” would be too broad.

The actual requirements of Rule 13(a) and applicable case law must be examined.

---

Permissive Counterclaims

A permissive counterclaim is a counterclaim that does not qualify as compulsory but may nevertheless be asserted when jurisdictional requirements are satisfied.

Rule 13(b) allows a party to state as a counterclaim a claim that is not compulsory.

This creates substantially more flexibility.

A defendant may have a claim against the plaintiff that arises from a completely different transaction.

For example:

• Plaintiff sues Defendant for breach of a lease.
• Defendant has an unrelated claim against Plaintiff for damage to separate property arising from a different event.

The second claim may be permissive rather than compulsory.

But the defendant cannot assume that filing it automatically gives the federal court jurisdiction.

An independent jurisdictional basis may be required.

---

Permissive Counterclaims and Jurisdiction

This is one of the most important differences between compulsory and permissive counterclaims.

A permissive counterclaim may not arise from the same transaction or occurrence as the plaintiff’s claim.

Consequently, supplemental jurisdiction may not necessarily be available.

The court must determine whether the counterclaim has an independent jurisdictional basis or otherwise falls within federal supplemental jurisdiction.

By contrast, compulsory counterclaims generally have a much stronger connection to the underlying federal case and often satisfy the constitutional “same case or controversy” requirement for supplemental jurisdiction.

But even here, jurisdiction should be analyzed rather than assumed.

A party cannot create federal subject-matter jurisdiction merely by attaching a claim to an existing federal lawsuit.

---

Supplemental Jurisdiction and Counterclaims

28 U.S.C. § 1367 provides the principal statutory framework for supplemental jurisdiction.

Under § 1367(a), federal courts may generally exercise supplemental jurisdiction over claims that are so related to claims within the court’s original jurisdiction that they form part of the same Article III case or controversy.

For diversity cases, however, § 1367(b) imposes additional restrictions in certain circumstances.

This distinction can become especially important with counterclaims.

A counterclaim may be:

• within original federal-question jurisdiction;
• within original diversity jurisdiction;
• within supplemental jurisdiction; or
• outside federal jurisdiction.

The classification of the original action therefore matters.

For the statutory framework, see 28 U.S.C. § 1367 at Cornell Law School.

---

Counterclaims in Diversity Cases

Diversity cases require particular attention.

Suppose a plaintiff invokes diversity jurisdiction.

The defendant then asserts a counterclaim.

The counterclaim may involve:

• different parties;
• a different amount in controversy;
• different substantive law; or
• facts related or unrelated to the original claim.

The court must determine whether the counterclaim falls within original diversity jurisdiction or supplemental jurisdiction.

Section 1367(b) can restrict certain claims in cases founded solely on diversity jurisdiction, particularly claims by certain plaintiffs against parties joined under particular provisions of the Federal Rules.

The jurisdictional analysis should therefore be performed separately for the counterclaim rather than assuming that every claim asserted in a diversity case automatically falls within federal jurisdiction.

---

Compulsory vs. Permissive Counterclaims

The distinction can be summarized as follows:

Compulsory Counterclaim	Permissive Counterclaim
Generally arises from the same transaction or occurrence	Does not necessarily arise from the same transaction or occurrence
Generally must be asserted in the current action	May be asserted if jurisdiction and procedural requirements are satisfied
Failure to assert may lead to later preclusion	Failure generally does not create the same compulsory-claim consequence
Strong relationship to original dispute	May concern an unrelated dispute
Often supported by supplemental jurisdiction	May require an independent jurisdictional basis

The classification can therefore have consequences extending beyond pleading.

---

What Is a Crossclaim Under Rule 13(g)?

Rule 13(g) governs crossclaims.

A pleading may state a crossclaim against a co-party if the claim arises out of the transaction or occurrence that is the subject matter of the original action or of a counterclaim.

The crossclaim may also relate to property that is the subject matter of the original action.

Unlike compulsory counterclaims under Rule 13(a), crossclaims are generally permissive.

That means a party is generally not required to assert a crossclaim simply because it could do so.

---

Example of a Crossclaim

Suppose a plaintiff is injured in a multi-car accident and sues two defendants:

• Driver A; and
• Driver B.

Driver A believes Driver B was entirely responsible for the accident.

Driver A may assert a crossclaim against Driver B for contribution or indemnity if the applicable substantive and procedural requirements are satisfied.

The crossclaim allows the court to address the relationship between the defendants within the existing lawsuit.

Instead of forcing Driver A to file a separate lawsuit against Driver B, the related dispute can potentially be resolved in the same action.

---

Crossclaims Are Generally Permissive

This distinction is crucial.

A defendant may have a valid crossclaim against another defendant but generally does not have to assert it.

If Driver A chooses not to assert the crossclaim against Driver B, the claim may potentially be litigated separately, subject to statutes of limitations, claim-preclusion principles, substantive law, and other applicable requirements.

This is different from a compulsory counterclaim, where failure to assert the claim can create much more serious preclusion consequences.

---

The Transaction-or-Occurrence Requirement for Crossclaims

Although crossclaims are generally permissive, they are not unlimited.

The claim must ordinarily arise from:

• the transaction or occurrence that is the subject matter of the original action; or
• the transaction or occurrence that is the subject matter of a counterclaim.

A crossclaim cannot simply be any unrelated claim one defendant happens to have against another defendant.

For example, if two companies are defendants in an antitrust lawsuit concerning one business transaction, one defendant generally cannot use Rule 13(g) simply to introduce an unrelated personal-injury dispute against the other defendant.

The connection requirement remains important.

---

Crossclaims and Contribution

Crossclaims are particularly common in cases involving contribution.

Suppose several defendants may be jointly responsible for the plaintiff’s injury.

One defendant may assert a crossclaim seeking contribution from another defendant.

Contribution generally concerns allocation of responsibility among parties who share liability for a plaintiff’s loss.

The precise availability and amount of contribution depend on substantive law.

Rule 13 provides the procedural mechanism for bringing the related claim within the existing action.

It does not itself create a substantive right to contribution.

---

Crossclaims and Indemnity

Crossclaims may also involve indemnity.

Indemnity generally concerns a party’s right to seek reimbursement or protection from another party for liability incurred toward a third person.

For example, a defendant may argue:

If I am held liable to the plaintiff, the other defendant is contractually or otherwise legally obligated to indemnify me.

The defendant may assert that claim as a crossclaim when Rule 13(g)’s requirements are satisfied.

Again, however, the existence of an indemnity crossclaim depends on substantive law or an applicable contract.

Rule 13 governs the procedural vehicle, not the underlying legal right.

---

Counterclaims and Crossclaims Are Not Defenses

A defense and a claim serve different purposes.

A defense generally argues that the plaintiff should not obtain the requested relief.

A counterclaim or crossclaim seeks affirmative relief.

For example:

“The plaintiff breached the contract first.”

This may be relevant as a defense.

But:

“The plaintiff breached the contract and therefore owes the defendant $50,000.”

This is a claim for affirmative relief and may constitute a counterclaim.

The distinction matters because the procedural rules governing claims, defenses, and counterclaims are not identical.

---

Counterclaims and Crossclaims Must Be Pleaded

Counterclaims and crossclaims are generally asserted through a pleading.

The pleading must satisfy applicable requirements governing:

• factual allegations;
• legal theories;
• jurisdiction;
• requested relief;
• signature and certification;
• and other procedural matters.

Rule 8 generally requires a short and plain statement showing that the pleader is entitled to relief.

The pleading must still contain enough factual content to satisfy the applicable pleading standard.

The fact that a claim appears as a counterclaim rather than a complaint does not make the pleading standard disappear.

---

Rule 12 and Counterclaims

A counterclaim can be challenged through procedural mechanisms such as a Rule 12(b)(6) motion.

For example, a plaintiff may respond to a defendant’s counterclaim by arguing that the counterclaim:

• fails to state a legally sufficient claim;
• is barred by an applicable defense;
• is outside the court’s jurisdiction; or
• presents another defect recognized by Rule 12.

Similarly, a party may challenge a crossclaim.

The rules governing motions to dismiss therefore operate in both directions.

A plaintiff can become a defendant with respect to a counterclaim and must respond accordingly.

---

Counterclaims and Answers

A defendant normally asserts a counterclaim in the defendant’s answer.

The pleading may therefore contain several different components:

1. admissions;
2. denials;
3. affirmative defenses; and
4. counterclaims.

These should not be confused.

For example:

Denial:
“The defendant denies that it breached the contract.”

Affirmative defense:
“Even if the plaintiff establishes a breach, the claim is barred by the statute of limitations.”

Counterclaim:
“The plaintiff breached the contract and owes the defendant damages.”

The same document can therefore perform several different procedural functions.

---

Counterclaims and Amendments

Rule 15 is particularly important when a party discovers a counterclaim after filing the answer.

A party may need to amend the answer to add the counterclaim.

As discussed in Amending Pleadings, Rule 15 can allow amendment as a matter of course during specified periods, or otherwise require consent or leave of court.

The Federal Rules no longer contain a separate Rule 13(f) procedure for omitted counterclaims. Instead, Rule 15 provides the principal mechanism for amending pleadings to add a counterclaim.

This makes the relationship between Rules 13 and 15 particularly important.

---

Counterclaims and Compulsory-Claim Timing

A defendant should identify potential counterclaims early.

Waiting can create several problems:

• the amendment period may expire;
• the statute of limitations may run;
• discovery may become more complicated;
• the opposing party may argue prejudice;
• a scheduling deadline may pass; or
• the claim may later be challenged as barred because it should have been asserted as a compulsory counterclaim.

Counterclaim analysis is therefore one of the important tasks that should occur when preparing an answer.

---

Crossclaims and Additional Parties

Rule 13(h) permits additional parties to be joined to a counterclaim or crossclaim when the requirements of Rules 19 and 20 are satisfied.

This is significant because a counterclaim or crossclaim may reveal that another person or entity should participate in the litigation.

But Rule 13(h) does not independently eliminate the requirements of joinder.

The court must still consider:

• whether joinder is authorized;
• whether the court has personal jurisdiction;
• whether subject-matter jurisdiction exists;
• whether venue is proper; and
• whether other procedural requirements are satisfied.

---

Counterclaims and Joinder

Rule 18 generally permits a party asserting a counterclaim to join additional claims against an opposing party, subject to jurisdictional requirements.

This means that once a party properly has a counterclaim against an opposing party, the rules may allow additional claims to be joined.

But joinder does not automatically create jurisdiction.

The distinction between joinder of claims and jurisdiction over claims remains essential.

A federal court may have procedural authority to join claims while still lacking subject-matter jurisdiction over one of them.

---

Crossclaims and Joinder

Similar principles apply to crossclaims.

A crossclaim must satisfy Rule 13(g), and additional parties may be joined under Rule 13(h) when Rules 19 and 20 permit it.

The result can produce a complex litigation structure involving:

• plaintiff claims;
• defendant counterclaims;
• defendant crossclaims;
• third-party claims;
• additional parties; and
• potentially multiple related causes of action.

Civil procedure provides mechanisms for organizing this complexity rather than requiring every related dispute to become a separate lawsuit.

---

Counterclaims and Third-Party Claims Are Different

Counterclaims and third-party claims are sometimes confused.

A counterclaim is directed against an opposing party.

A third-party claim under Rule 14 is generally brought by a defending party against a person who is not yet a party and who may be liable to the defending party for all or part of the plaintiff’s claim.

For example:

Counterclaim:

Plaintiff → Defendant
Defendant → Plaintiff

Third-party claim:

Plaintiff → Defendant
Defendant → Third Party

These are different procedural mechanisms.

Rule 14 governs third-party practice, while Rule 13 governs counterclaims and crossclaims.

---

Counterclaims and Crossclaims in Multi-Party Litigation

Consider a lawsuit involving:

• Plaintiff;
• Defendant A;
• Defendant B;
• Defendant C.

The litigation could potentially contain:

Plaintiff’s claims:

Plaintiff → A
Plaintiff → B
Plaintiff → C

Counterclaim:

A → Plaintiff

Crossclaim:

A → B

Another crossclaim:

B → C

Third-party claim:

C → Third Party D

The Federal Rules provide mechanisms for managing these relationships.

But each claim still requires its own legal and jurisdictional analysis.

Complexity in the pleadings does not eliminate the requirement that each claim be legally cognizable.

---

Counterclaims and Subject-Matter Jurisdiction

Subject-matter jurisdiction must be considered separately for counterclaims.

Suppose the original action is based on federal question jurisdiction.

A defendant asserts a state-law counterclaim arising from the same dispute.

The court may be able to exercise supplemental jurisdiction.

But suppose the defendant instead asserts an unrelated state-law claim against the plaintiff.

The court may need an independent jurisdictional basis.

The same basic analysis applies in diversity cases, with the additional restrictions imposed by § 1367(b).

The procedural ability to plead a counterclaim does not automatically answer the jurisdictional question.

---

Counterclaims and Removal

Counterclaims can also become relevant to removal.

A defendant’s counterclaim generally does not, by itself, create federal-question jurisdiction under the ordinary well-pleaded complaint rule.

The plaintiff’s properly pleaded complaint ordinarily determines whether federal-question jurisdiction exists.

There are specialized statutory exceptions in particular areas of law, but the general principle remains that a federal defense or counterclaim does not ordinarily transform a state-law complaint into a removable federal-question case.

Therefore, the existence of a counterclaim should not be confused with the jurisdictional basis for removal.

---

Counterclaims and Claim Preclusion

Compulsory counterclaims are closely connected to claim preclusion.

Claim preclusion prevents parties from repeatedly litigating claims that should have been resolved in an earlier action.

If a defendant was required to assert a counterclaim in an earlier lawsuit but failed to do so, the defendant may face a later preclusion argument.

The exact doctrine varies by jurisdiction and depends on the relationship between the two proceedings.

The practical lesson is important:

A defendant should identify potentially compulsory counterclaims before the first lawsuit is resolved.

Waiting until after judgment may be too late.

---

Crossclaims and Claim Preclusion

Because crossclaims are generally permissive, failure to assert one does not ordinarily produce the same automatic compulsory-claim consequence.

But that does not mean a crossclaim can always be saved indefinitely.

Other doctrines may still apply, including:

• statutes of limitations;
• res judicata or claim preclusion;
• compulsory joinder requirements;
• contractual limitations;
• equitable doctrines; and
• applicable state procedural law.

A permissive crossclaim is therefore optional under Rule 13(g), but optional does not mean legally risk-free to postpone.

---

Counterclaims and Jury Trial Rights

Counterclaims can also affect the right to a jury trial.

The Seventh Amendment and Rule 38 govern federal civil jury-trial rights.

A counterclaim may introduce new legal issues that carry a jury-trial right even though the original claim presents a different combination of legal and equitable issues.

The precise analysis depends on the nature of the claims and remedies sought.

Parties should therefore consider jury-trial implications when drafting counterclaims and responding to them.

---

Counterclaims for Damages and Other Relief

A counterclaim may seek many forms of relief.

Depending on the underlying substantive law, a party may request:

• monetary damages;
• declaratory relief;
• injunctive relief;
• specific performance;
• restitution;
• contribution;
• indemnification; or
• another legally available remedy.

The counterclaim should identify the relief sought in accordance with the applicable pleading requirements.

The fact that the claim is asserted inside another lawsuit does not limit the types of relief that substantive law permits.

---

Crossclaims for Contribution and Indemnity

Contribution and indemnity are especially common in multi-defendant litigation.

Suppose a plaintiff alleges that three defendants jointly caused an injury.

Defendant A may argue:

If I am held liable, Defendant B should contribute to the judgment.

Defendant A might therefore assert a crossclaim against Defendant B.

Alternatively, A might argue:

If I am held liable, B must indemnify me under our contract.

That may also support a crossclaim.

The underlying right depends on substantive law, while Rule 13 determines whether the claim can be asserted as a crossclaim in the existing action.

---

Common Mistakes

Mistaking a Defense for a Counterclaim

Saying that the plaintiff cannot prove liability is not necessarily a counterclaim.

A counterclaim seeks affirmative relief.

Assuming Every Counterclaim Is Compulsory

A counterclaim is compulsory only when the requirements of Rule 13(a) are satisfied.

Assuming Every Counterclaim Has Federal Jurisdiction

The court must have subject-matter jurisdiction over the counterclaim.

Confusing Counterclaims With Crossclaims

A counterclaim is generally against an opposing party.

A crossclaim is against a co-party.

Confusing Crossclaims With Third-Party Claims

A crossclaim is generally directed against an existing co-party.

A third-party claim under Rule 14 brings a new person or entity into the action under the rule’s requirements.

Ignoring the Transaction-or-Occurrence Requirement

A crossclaim must satisfy Rule 13(g)’s relationship requirement.

Waiting Until the End of the Case

Potential compulsory counterclaims should be identified early.

Assuming Amendment Automatically Solves the Problem

Adding a late counterclaim may require leave of court and may raise prejudice, scheduling, limitations, jurisdiction, and other issues.

Ignoring Supplemental Jurisdiction

A related counterclaim may fall within supplemental jurisdiction, but unrelated claims may require an independent jurisdictional basis.

---

A Practical Method for Analyzing a Counterclaim

When confronted with a potential counterclaim, ask:

1. Who is asserting the claim?

Is the claimant a defendant or another party?

2. Against whom is the claim asserted?

Is the opposing party the plaintiff or another opposing party?

3. Is the claim compulsory?

Does it arise from the transaction or occurrence that is the subject matter of the opposing party’s claim?

4. Is there an exception?

Check Rule 13(a)’s qualifications.

5. What jurisdictional basis exists?

Ask whether the counterclaim falls within:

• federal-question jurisdiction;
• diversity jurisdiction;
• supplemental jurisdiction; or
• another statutory basis.

6. Was the counterclaim timely asserted?

Consider Rule 12, Rule 15, scheduling orders, and statutes of limitations.

7. What relief is requested?

Identify the substantive remedy being sought.

8. Are additional parties necessary?

If so, analyze Rules 13(h), 19, and 20.

---

A Practical Method for Analyzing a Crossclaim

For a crossclaim, ask:

1. Are the parties co-parties?

For example, defendant against defendant.

2. Does the claim arise from the relevant transaction or occurrence?

The relationship must satisfy Rule 13(g).

3. Is the crossclaim based on related property?

Rule 13(g) also recognizes claims relating to property that is the subject matter of the original action.

4. Is the crossclaim permissive?

Generally, yes.

5. Does the court have jurisdiction?

Analyze original and supplemental jurisdiction as appropriate.

6. Are additional parties required?

If so, analyze Rules 13(h), 19, and 20.

7. Are there limitations or other substantive-law problems?

Procedural permission to assert the claim does not eliminate substantive requirements.

---

A Complete Hypothetical

Consider a lawsuit involving a defective product.

A consumer sues Manufacturer A and Distributor B for injuries allegedly caused by a defective machine.

The pleadings could develop as follows.

Plaintiff’s Claims

The consumer asserts negligence and product-liability claims against A and B.

Manufacturer A’s Answer

A denies liability.

Manufacturer A’s Counterclaim

A alleges that the consumer breached a contractual obligation concerning the machine and seeks damages.

If the claim is against the plaintiff, it is a counterclaim.

Manufacturer A’s Crossclaim

A alleges that Distributor B is contractually required to indemnify A for liability arising from the machine.

A asserts that claim against B.

That is a potential crossclaim.

Distributor B’s Crossclaim

B alleges that Manufacturer A supplied the defective machine and seeks contribution if B is found liable.

That is another potential crossclaim.

Third-Party Claim

Suppose B then discovers that an independent component manufacturer supplied the allegedly defective part.

B may potentially seek to bring that entity into the litigation through Rule 14 if the requirements for third-party practice are satisfied.

The single lawsuit can therefore contain several different categories of claims.

Each has a different procedural foundation.

---

Why Counterclaims and Crossclaims Promote Efficiency

The purpose of these rules is not merely convenience.

Without counterclaims and crossclaims, litigation could fragment into multiple lawsuits involving the same facts.

A single dispute might otherwise produce:

• one lawsuit by the plaintiff against Defendant A;
• another lawsuit by A against the plaintiff;
• another lawsuit by A against B;
• another lawsuit by B against A;
• and additional litigation involving indemnity or contribution.

That fragmentation can increase:

• litigation costs;
• discovery burdens;
• judicial workload;
• inconsistent factual findings; and
• the possibility of conflicting judgments.

Rules 13 and related joinder rules provide mechanisms for bringing related disputes together.

---

But Efficiency Does Not Eliminate Jurisdiction

There is an important limitation.

Federal courts cannot hear claims merely because hearing them together would be convenient.

Subject-matter jurisdiction remains fundamental.

The court must have constitutional and statutory authority over each claim, either through original jurisdiction or an applicable supplemental-jurisdiction provision.

This is particularly important for permissive counterclaims and certain additional parties.

Procedural joinder and jurisdiction are related but distinct concepts.

---

Counterclaims, Crossclaims, and the Structure of a Lawsuit

As a lawsuit becomes more complex, the distinction among claims becomes increasingly important.

A simplified structure is:

Plaintiff’s claim

Plaintiff → Defendant

Counterclaim

Defendant → Plaintiff

Crossclaim

Defendant A → Defendant B

Third-party claim

Defendant → Third-Party Defendant

These procedural relationships allow courts to manage multiple disputes within one action while maintaining separate legal requirements for each type of claim.

---

Key Takeaways

• A counterclaim is generally a claim asserted against an opposing party.
• A crossclaim is generally a claim asserted against a co-party.
• Rule 13 is the principal federal rule governing both.
• Counterclaims may be compulsory or permissive.
• A compulsory counterclaim generally arises from the same transaction or occurrence as the opposing party’s claim and ordinarily must be asserted in the existing action.
• Failure to assert a compulsory counterclaim may create significant claim-preclusion consequences.
• A permissive counterclaim does not necessarily arise from the same transaction or occurrence.
• A permissive counterclaim still requires an appropriate jurisdictional basis.
• Crossclaims under Rule 13(g) are generally permissive.
• A crossclaim generally must arise from the transaction or occurrence that is the subject matter of the original action or a counterclaim, or concern related property.
• Contribution and indemnity are common subjects of crossclaims.
• A counterclaim is different from an affirmative defense because a counterclaim seeks affirmative relief.
• A crossclaim is different from a third-party claim because a crossclaim is generally asserted against an existing co-party, while Rule 14 governs bringing certain new parties into the action.
• Rule 15 governs amendments that may be necessary to add counterclaims or other claims after the initial pleading.
• Subject-matter jurisdiction must be analyzed separately for counterclaims and crossclaims.
• Supplemental jurisdiction may support related claims, but jurisdiction should never be assumed merely because claims are procedurally joined.
• Rules 13, 15, 18, 19, 20, and 14 may operate together in complex litigation.

Frequently Asked Questions

What is a counterclaim?

A counterclaim is a claim asserted by a party against an opposing party within an existing lawsuit, most commonly a defendant’s claim against the plaintiff.

What is a crossclaim?

A crossclaim is generally a claim asserted by one party against another party on the same side of the litigation, such as one defendant against another defendant.

What is the difference between a counterclaim and a crossclaim?

The primary difference is the relationship between the parties. A counterclaim is generally against an opposing party; a crossclaim is generally against a co-party.

What is a compulsory counterclaim?

A compulsory counterclaim generally arises out of the same transaction or occurrence as the opposing party’s claim and must ordinarily be asserted in the existing action.

What is a permissive counterclaim?

A permissive counterclaim is a claim that does not qualify as compulsory but may be asserted if the applicable procedural and jurisdictional requirements are satisfied.

Are crossclaims compulsory?

Generally, no. Crossclaims under Rule 13(g) are ordinarily permissive, although they must satisfy the rule’s connection requirements.

What happens if a compulsory counterclaim is not asserted?

The party may later face a claim-preclusion bar preventing assertion of the omitted claim in a separate action, depending on the circumstances and applicable law.

Does every counterclaim require federal jurisdiction?

Yes, a federal court must have subject-matter jurisdiction over the counterclaim. The jurisdiction may come from original jurisdiction or, where permitted, supplemental jurisdiction.

Can a counterclaim be unrelated to the plaintiff’s claim?

A permissive counterclaim can be unrelated to the transaction or occurrence underlying the plaintiff’s claim, but it must have an appropriate jurisdictional basis and satisfy other procedural requirements.

Can one defendant sue another defendant in the same lawsuit?

Yes. When the requirements of Rule 13(g) are satisfied, one defendant may assert a crossclaim against another defendant.

Can a crossclaim seek contribution?

Yes. Contribution is a common subject of crossclaims when applicable substantive law recognizes the right.

Can a crossclaim seek indemnification?

Yes. A defendant may assert an indemnity claim against a co-defendant when Rule 13(g) and the applicable substantive law permit it.

Can a defendant add a counterclaim later?

Possibly. Rule 15 governs amendments that may be necessary to add a counterclaim after the original pleading, and court permission may be required depending on timing.

Are counterclaims and crossclaims separate lawsuits?

Not necessarily. They are claims asserted within an existing action. They allow additional disputes to be resolved within the same litigation when the applicable rules and jurisdictional requirements are satisfied.

Can a plaintiff be a defendant?

Yes. Once a defendant asserts a counterclaim against the plaintiff, the plaintiff becomes the defending party with respect to that counterclaim.

Conclusion

Counterclaims and crossclaims demonstrate that civil litigation is not always a simple contest between one plaintiff and one defendant. A lawsuit can contain claims moving in several directions, and the Federal Rules provide structured mechanisms for managing those relationships.

The most important distinction is straightforward: a counterclaim generally runs against an opposing party, while a crossclaim generally runs against a co-party.

Counterclaims require an additional distinction between compulsory and permissive claims. A compulsory counterclaim generally arises from the same transaction or occurrence as the opposing party’s claim and ordinarily must be asserted in the existing litigation. A permissive counterclaim may concern a different dispute but still requires an appropriate jurisdictional basis. Crossclaims are generally permissive but must satisfy Rule 13(g)’s transaction-or-occurrence or property-related requirements.

These rules promote efficiency by allowing related disputes to be resolved together. But they do not eliminate the other foundations of civil procedure. Subject-matter jurisdiction, personal jurisdiction, venue, pleading standards, statutes of limitations, joinder rules, amendment rules, and substantive law continue to apply.

Ultimately, counterclaims and crossclaims perform an important structural function: they allow a single civil action to resolve the interconnected legal disputes that arise from the same underlying controversy while preserving the procedural and jurisdictional boundaries of the federal courts.

---