---
title: "Rule 13(g) | Civil Procedure"
description: "Rule 13(g) lets one party file a cross-claim against a co-party in the same federal case when the claim arises from the same transaction or occurrence."
canonical: "https://fiveable.me/civil-procedure/key-terms/rule-13g"
type: "key-term"
subject: "Civil Procedure"
unit: "Unit 2"
---

# Rule 13(g) | Civil Procedure

## Definition

Rule 13(g) is the Federal Rule of Civil Procedure that lets a party file a cross-claim against a co-party in the same lawsuit. It covers related claims like contribution or indemnity that arise from the same transaction or occurrence.

## What It Is

Rule 13(g) is the Civil Procedure rule that lets one party bring a cross-claim against a co-party in the same case. A cross-claim is not aimed at the original plaintiff or defendant on the other side of the aisle, it is a claim between people already on the same side of the lawsuit.

That setup matters because multi-party litigation often creates overlapping blame. If two defendants both point to the same accident, contract breach, or defective product, one defendant may want to say, in effect, “If I end up paying, you should reimburse me” or “You are actually partly responsible too.” Rule 13(g) gives that party a way to raise the issue inside the existing case instead of filing a second lawsuit.

The rule only reaches claims that arise out of the same transaction or occurrence as the main action or a counterclaim in the case. That link keeps the litigation tied together. If the new claim is about a completely different dispute, Rule 13(g) is not the right tool, even if the same people happen to be in the courtroom.

Rule 13(g) is commonly used for contribution and indemnity claims. Contribution means one co-party seeks to split liability with another co-party. Indemnity means one co-party argues another should cover the loss entirely or in a larger share. Those claims often show up in tort cases, insurance disputes, and complex contract cases where multiple parties may owe duties tied to the same event.

The point of the rule is efficiency. One judge, one record, and one group of facts can resolve the overlap instead of forcing the parties to duplicate discovery, motions, and trials. That said, the claim still has to fit within the case structure. A cross-claim under Rule 13(g) is about relation to the existing action, not about creating a brand-new, unrelated dispute between co-parties.

A simple way to picture it: if two defendants are sued for the same warehouse fire, one defendant can use Rule 13(g) to claim the other caused the fire, owes contribution, or must indemnify them. The court can sort out those shared questions together, which is exactly what the rule is built to do.

## Why It Matters

Rule 13(g) shows how Civil Procedure handles overlap in multi-party litigation. Without it, co-parties would often have to wait for the first case to end and then start a separate suit over fault-sharing, reimbursement, or responsibility. That creates duplicate fact-finding and the risk of inconsistent results.

This rule also fits the broader structure of joinder. Civil Procedure is not just about who can sue whom, it is about how the court packages related claims so the dispute can be resolved efficiently and fairly. Rule 13(g) keeps related responsibility questions in one forum, which matters in cases with shared liability, layered contracts, or multiple tortfeasors.

It also gives you a cleaner way to read a case fact pattern. If you see two defendants, one insurance carrier and one insured, or multiple contractors tied to the same project, Rule 13(g) may be the move when one co-party wants to shift or share liability. That is different from just denying the claim. It is an extra claim for relief inside the same lawsuit.

In courses and assignments, this rule often appears when you are asked to sort pleadings. The key is recognizing who is suing whom, whether the parties are already on the same side, and whether the new claim comes from the same underlying event. That kind of issue-spotting is a big part of Civil Procedure analysis.

## Connections

### Cross-Claim

Rule 13(g) is the rule that authorizes a cross-claim. The term cross-claim names the actual pleading, while Rule 13(g) tells you when that pleading is allowed. If a fact pattern asks whether one defendant can sue another defendant in the same case, you are usually looking for a cross-claim under this rule.

### Counterclaim

Counterclaims run against an opposing party, usually a defendant against the plaintiff, while cross-claims run against a co-party on the same side. Both are Rule 13 devices, but they solve different problems. When you separate them correctly, the rest of the pleading analysis gets much easier.

### Joinder

Rule 13(g) is part of the larger joinder system, which organizes related claims and parties into one lawsuit. Joinder rules try to avoid piecemeal litigation and conflicting outcomes. Rule 13(g) is one of the ways the Federal Rules let related disputes stay together when the facts overlap.

### [Judicial Authority](/civil-procedure/key-terms/judicial-authority)

Rule 13(g) reflects the court’s power to manage related claims in a single action. The court can hear the cross-claim when it belongs in the same case structure, which supports efficient case management. This is different from asking whether the court has power over a person in the personal jurisdiction sense.

## On the AP Exam

A pleading or essay question may give you a lawsuit with multiple defendants and ask whether one defendant can sue another defendant inside the same action. The move is to check whether the new claim is a cross-claim under Rule 13(g) and whether it arises from the same transaction or occurrence as the main claim. If the facts show shared blame, contribution, or indemnity, that is a strong Rule 13(g) signal.

You also use it to distinguish among pleadings. If the claim runs against the plaintiff, think counterclaim. If it runs against a co-party, think cross-claim. If the problem asks about efficiency or avoiding a second lawsuit, connect the rule to joinder and judicial economy. In a case analysis, spell out who the parties are, what event they share, and why the claim belongs in the existing lawsuit rather than a separate one.

## Rule 13(g) vs Counterclaim

Rule 13(g) cross-claims are filed against a co-party, while counterclaims are filed against an opposing party. That difference is the fastest way to separate them in a fact pattern. If the claim targets someone on your side of the caption, you are looking at a cross-claim, not a counterclaim.

## Key Takeaways

- Rule 13(g) lets a party bring a cross-claim against a co-party in the same federal case.
- The cross-claim has to arise from the same transaction or occurrence as the main action or counterclaim.
- This rule is often used for contribution and indemnity claims when multiple parties may share liability.
- Rule 13(g) keeps related disputes in one lawsuit, which saves time and reduces duplicate litigation.
- If the claim is against the plaintiff or another opposing party, the better label is usually counterclaim, not cross-claim.

## FAQs

### What is Rule 13(g) in Civil Procedure?

Rule 13(g) is the Federal Rule of Civil Procedure that allows a party to file a cross-claim against a co-party in the same lawsuit. It covers related claims that arise out of the same transaction or occurrence, often including contribution or indemnity claims.

### What is the difference between Rule 13(g) and a counterclaim?

A counterclaim goes against an opposing party, like a defendant suing the plaintiff. A Rule 13(g) cross-claim goes against a co-party, such as one defendant suing another defendant. The party alignment in the caption usually tells you which one fits.

### Can a Rule 13(g) cross-claim ask for indemnity or contribution?

Yes. Those are two of the most common uses of Rule 13(g). If one co-party says another should reimburse them or cover some or all of the loss tied to the same event, a cross-claim may be the right pleading.

### Why does Rule 13(g) matter in Civil Procedure?

It keeps related disputes together so the court can resolve shared liability in one case instead of splitting it across multiple lawsuits. That makes the fact pattern easier to manage and helps avoid inconsistent outcomes when the same event affects several parties.

## Related Study Guides

- [2.4 In Rem and Quasi in Rem Jurisdiction](/civil-procedure/unit-2/rem-quasi-rem-jurisdiction/study-guide/KuM15yCqzNrzwcCp)

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