Removal and supplemental jurisdiction

Removal and supplemental jurisdiction

Published September 28, 2026

Removal and supplemental jurisdiction

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Removal’s Federal Gate: Who May Move the Case and Where

Removal and supplemental jurisdiction require separate decisions: first, whether a defendant may move a state-court action into federal court; second, which related claims may remain there.

Run the removal analysis in this order:

  1. Identify original jurisdiction. The federal court must have original jurisdiction over at least one claim. A well-pleaded federal claim can supply federal-question removal jurisdiction; a defense or counterclaim cannot. Diversity-only removal depends on the diversity requirements already covered in the topic lesson.

  2. Identify the remover. Under 28 U.S.C. § 1441(a), removal is ordinarily available only to the defendant or defendants, not the plaintiff.

  3. Check the forum-defendant rule. In an action removable solely on diversity grounds, § 1441(b)(2) bars removal when any properly joined and served defendant is a citizen of the forum state. The rule does not bar federal-question removal. A forum defendant who has not yet been served does not trigger this particular bar.

  4. Check consent. All defendants who have been properly joined and served must join in or consent to removal. This is the rule of unanimity. A later-served defendant receives its own 30-day period and may trigger a new opportunity for the earlier-served defendants to consent.

  5. Select the district. The notice belongs in the federal district embracing the state court’s location, not necessarily the district where a defendant resides or where the events occurred.

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If the federal claim is accompanied by a state claim arising from the same facts, the state claim ordinarily travels under supplemental jurisdiction. If a federal-question action also contains a claim outside both original and supplemental jurisdiction, § 1441(c) permits removal of the entire action but requires the federal court to sever and remand that unrelated claim. Thus, “state-law claim” does not itself mean “remand.” This is closed-book: you must be able to state these requirements from memory.

Section 1446 governs the mechanics. The removing defendant files a notice of removal in the proper federal district, stating the grounds for removal and attaching the relevant pleadings, process, and orders. The defendant must file within 30 days after receiving, through service or otherwise, the initial pleading showing removability. If the initial pleading is not removable, a later amended pleading, motion, order, or other paper can start a new 30-day period when removability first becomes ascertainable.

Every properly joined and served defendant must consent within the applicable period. Failure to obtain required consent is a procedural defect, not a defect in subject-matter jurisdiction. In a diversity case, removal generally must also occur within one year after commencement, unless the plaintiff acted in bad faith to prevent removal. That one-year limit does not govern federal-question removal.

After filing, the removing party promptly gives written notice to the adverse parties and files a copy with the state clerk. The state court then ceases proceeding unless and until the case is remanded. Do not confuse the proper removal district with federal venue or transfer: the removal destination is fixed by the state court’s geographic location.

Defect or issueCharacter of issueTime to raise itConsequence
No federal subject-matter jurisdictionJurisdictionalAny time before final judgmentFederal court must remand under § 1447(c)
Wrong federal districtProceduralWithin 30 days after noticeTimely remand or other corrective action may follow
Missing required defendant consentProceduralWithin 30 days after noticeWaived if not timely raised
Late notice or exceeded diversity one-year limitProceduralWithin 30 days after noticeWaived if not timely raised

Under § 1447(c), a party must move to remand for any defect other than lack of subject-matter jurisdiction within 30 days after the notice of removal is filed. A court must remand whenever it lacks subject-matter jurisdiction, even if no party timely moved. By contrast, a procedural defect is ordinarily lost if the 30-day remand deadline passes.

The near miss is therefore jurisdictional versus procedural: absence of an original-jurisdiction basis is never cured by silence, while improper procedure generally is.

Section 1367(a) supplies supplemental jurisdiction over additional claims that form part of the same Article III case or controversy as a claim within original jurisdiction. The usual formulation is a common nucleus of operative fact. The claims need not involve identical legal theories, but they must substantially overlap in facts. A shared defendant, a general relationship between the disputes, or overlapping witnesses alone is not enough.

Supplemental jurisdiction can include claims involving additional parties. It is not an independent doorway into federal court: at least one claim must first support original jurisdiction. A state-law claim cannot be removed by itself merely because it is related to another state-law claim.

Section 1367(b) creates a mandatory restriction in an action whose original jurisdiction is founded solely on diversity. In that setting, supplemental jurisdiction is unavailable when its exercise would be inconsistent with the diversity requirements and the claim is:

  • a claim by a plaintiff against a person made a party under Rule 14, 19, 20, or 24;
  • a claim by a person proposed to be joined as a plaintiff under Rule 19 or 24; or
  • a claim by a person seeking to intervene as a plaintiff under Rule 24.

The key near miss is § 1367(b) versus § 1367(c). Section 1367(b) is a mandatory, diversity-only bar aimed at particular plaintiff claims and added-party configurations. Section 1367(c) is discretionary and can apply in any case with supplemental claims.

Section 1367(b) does not broadly eliminate every related claim. For example, a plaintiff’s related claim against an existing diverse defendant may remain supplemental when the diversity requirements are otherwise satisfied. Nor does the text impose the same listed-claim restriction on a defendant’s related counterclaim. The exact party and claim direction matters.

Even when § 1367(a) authorizes supplemental jurisdiction and § 1367(b) does not forbid it, § 1367(c) allows the court to decline. The court may decline when:

  1. the supplemental claim raises a novel or complex issue of state law;
  2. the supplemental claims substantially predominate over the claims within original jurisdiction;
  3. the court has dismissed all claims over which it had original jurisdiction; or
  4. in exceptional circumstances, there are other compelling reasons for declining jurisdiction.

Declining is permissive, not automatic. The court considers judicial economy, convenience, fairness, and comity. Dismissal of the federal anchor therefore does not mechanically require remand or dismissal of every state claim; it creates the § 1367(c)(3) discretion to decide whether the remaining claims belong in federal court.

The second near miss is same case or controversy versus supplemental authorization. A claim may satisfy § 1367(a) yet still be unavailable under § 1367(b), or available yet declined under § 1367(c). Analyze those stages separately.

One Removal File: Two Answers Hidden Among Six

A plaintiff, a citizen of State A, sues D1, a citizen of State A, and D2, a citizen of State B, in a State A court located in Federal District X. The complaint pleads a federal employment claim against D1, a related state contract claim against D1, and a related state claim against D2. All defendants are properly served, both consent within 30 days, and D1 files the notice in District X.

Practice

Which TWO statements are correct?

(A) Removal is available despite D1’s State A citizenship because the forum-defendant rule applies only to an action removable solely on diversity grounds.(B) The federal court may exercise supplemental jurisdiction over the state claims because they form part of the same case or controversy as the federal claim.(C) D2’s citizenship makes removal unavailable because complete diversity is required in every removed action.(D) The state claims must be severed and remanded under § 1441(c) merely because they arise under state law.(E) The plaintiff may remove because state and federal courts have concurrent jurisdiction.(F) The notice is filed in the wrong district because removal must occur where D1 resides.
Your answers

Three Timed Drills: Removal Defects and Supplemental Limits

Practice

A State A plaintiff sues a State B defendant on a federal claim in a State A court located in Federal District Y. The defendant receives the complaint on May 1 but files the notice of removal on June 5. The plaintiff moves for remand on June 20. What is the best result?

A diversity-only action satisfies the amount requirement and initially involves a State A plaintiff and State B defendant. The plaintiff then seeks to add a nondiverse person as a defendant under Rule 20 on a claim arising from the same transaction. What is the result?

A federal court has resolved all federal claims in a removed case but retains related state claims. The state claims raise ordinary state-law issues and do not independently support federal jurisdiction. What may the court do?

High-Yield Points - ⚡ Biggest Takeaways

Remove only when original jurisdiction exists, and file in the district embracing the state court. Treat missing subject-matter jurisdiction as permanent; treat other removal defects as 30-day remand issues. Analyze supplemental jurisdiction in three stages: same case, § 1367(b) bar, then § 1367(c) discretion.

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Practice Questions: Removal and supplemental jurisdiction

  1. 1. Using only the supplied file and legal resources, prepare a persuasive memorandum assessing whether Harbor Medical Supply LLC should move to remand the removed action to state court. Address federal-question jurisdiction, diversity citizenship, the amount in controversy, removal procedure, the strongest defense arguments, and the factual investigation that should occur before filing.

    • 2.

      • 3. Using only the supplied file and legal resources, prepare an objective memorandum to the supervising attorney assessing Park's jury-demand deadline, the effect of the proposed new claim on jury rights, the likely amendment ruling, and the improvements needed in the motion.

        • 4. Using only the supplied file and legal resources, prepare a persuasive memorandum supporting Greenway Analytics's motion for leave to amend its complaint to add a fraudulent-inducement claim against DataForge, Inc.

          • 5.

            • 6.

              • 7. A citizen of State A sued a corporation incorporated and headquartered in State B in federal court under diversity jurisdiction, seeking $500,000 for injuries caused by an allegedly defective product. State A law permits compensatory damages but provides that punitive damages are unavailable in product-liability actions. No federal statute or Federal Rule addresses the availability of punitive damages. The plaintiff nevertheless requested punitive damages, arguing that federal courts traditionally exercise discretion over remedies and that allowing punitive damages would encourage careful manufacturing. The corporation moved to strike the punitive-damages request. Which of the following is the strongest argument supporting the corporation's motion?

                • A. The state restriction governs because it defines the available remedy and disregarding it could produce materially different outcomes in state and federal court.
                • B. The state restriction governs because federal courts must apply every state rule whenever jurisdiction is based solely on diversity of citizenship.
                • C. Federal law governs because the requested relief appears in a pleading, and pleading matters are necessarily procedural under federal law.
                • D. Federal law governs because a federal court may disregard state law when the court believes a different remedy would advance deterrence.
                Show answer

                Answer: A. The state restriction governs because it defines the available remedy and disregarding it could produce materially different outcomes in state and federal court.

                The state restriction governs because it defines the available remedy and disregarding it could produce materially different outcomes in state and federal court. - State A’s bar on punitive damages in product-liability actions limits the available remedy, and no federal statute or Federal Rule conflicts with it. - Allowing the plaintiff to seek punitive damages only in federal court could materially change the outcome and encourage forum shopping, contrary to Erie principles. The state restriction governs because federal courts must apply every state rule whenever jurisdiction is based solely on diversity of citizenship. - Diversity jurisdiction does not require federal courts to apply every state rule; federal procedural law still governs procedural matters. - State A’s restriction applies because it limits damages in this product-liability action, not simply because the parties are citizens of different states. Federal law governs because the requested relief appears in a pleading, and pleading matters are necessarily procedural under federal law. - Federal rules may govern how the plaintiff pleads a request for relief, but they do not create an entitlement to punitive damages. - The motion concerns whether State A permits punitive damages for this product-liability claim, not how the request appears in the complaint. Federal law governs because a federal court may disregard state law when the court believes a different remedy would advance deterrence. - A federal court’s preference for stronger deterrence does not override State A’s substantive limit on damages. - Because no federal statute or Federal Rule addresses punitive-damages availability, the court cannot supply a different remedy merely as a policy choice.

              • 8. A citizen of State A purchased an electric bicycle through a retailer's interactive website while at home in State A. The retailer is incorporated and has its principal place of business in State B. It has no property or employees in State A, but it ships hundreds of bicycles there annually, advertises free delivery to State A, and provides remote warranty service to State A customers. The bicycle's battery allegedly malfunctioned while the customer was riding near her home in State A, causing serious injuries. She sued the retailer in a federal district court in State A, seeking $180,000 under state products-liability law. The retailer timely moved to dismiss for lack of personal jurisdiction. Which of the following is the customer's strongest argument that the court may exercise personal jurisdiction?

                • A. The court may exercise specific jurisdiction because the claim arises from the retailer's deliberate sales and support activities directed to the forum state.
                • B. The court may exercise general jurisdiction because substantial recurring sales make the retailer at home in every state where it conducts business.
                • C. The court lacks personal jurisdiction because the customer's injury occurred outside the forum state, even though the product was purchased and used there.
                • D. The court lacks personal jurisdiction unless the retailer owns property or maintains employees in the forum state.
                Show answer

                Answer: A. The court may exercise specific jurisdiction because the claim arises from the retailer's deliberate sales and support activities directed to the forum state.

                The court may exercise specific jurisdiction because the claim arises from the retailer's deliberate sales and support activities directed to the forum state. - The retailer purposefully directed sales toward State A by advertising free delivery there, shipping hundreds of bicycles there annually, and serving its customers remotely. - This products-liability claim arises from a bicycle purchased in State A and an alleged battery malfunction that injured the customer there, connecting the suit to those forum-directed activities. The court may exercise general jurisdiction because substantial recurring sales make the retailer at home in every state where it conducts business. - A corporation is ordinarily at home where it is incorporated or has its principal place of business—both in State B for this retailer. - Hundreds of annual sales to State A may support specific jurisdiction over a related claim, but they do not make the retailer at home in every state where it sells bicycles. The court lacks personal jurisdiction because the customer's injury occurred outside the forum state, even though the product was purchased and used there. - The premise is incorrect: the battery allegedly malfunctioned while the customer was riding near her home in State A. - The in-state purchase and injury connect the claim to the retailer’s deliberate State A sales and support activities, supporting specific jurisdiction. The court lacks personal jurisdiction unless the retailer owns property or maintains employees in the forum state. - Property or employees in State A are not prerequisites to specific jurisdiction. - The retailer’s targeted delivery offer, recurring shipments, and remote warranty service establish purposeful State A contacts despite its lack of a physical presence there.

              Flashcards: Removal and supplemental jurisdiction

              1. 1. When may a defendant remove a civil action from state court to federal court?

                Show answer

                A defendant may remove if the federal court would have original subject-matter jurisdiction, generally within 30 days after receiving the initial pleading or another paper showing removability. In a diversity-only case, removal is barred if any properly joined and served defendant is a citizen of the forum state, subject to statutory exceptions.

              2. 2. What is the test for supplemental jurisdiction over a claim?

                Show answer

                The federal court may hear a claim forming part of the same Article III case or controversy, ordinarily because the claims share a common nucleus of operative fact. In diversity cases, a plaintiff generally may not use supplemental jurisdiction to evade complete diversity or the amount-in-controversy requirement.

              3. 3. Explain why a federal defense generally cannot establish federal-question jurisdiction and how aggregation rules apply to separate claims against separate defendants in diversity jurisdiction.

                Show answer

                A federal defense, such as preemption, does not appear on the face of the plaintiff's properly pleaded complaint and thus cannot create federal-question jurisdiction under the well-pleaded complaint rule. For diversity jurisdiction, a plaintiff generally cannot aggregate separate claims against separate defendants to meet the amount-in-controversy requirement, unless the defendants are jointly liable on the same obligation.

              4. 4. When does a contract with a forum resident, or a website accessible in the forum, fail by itself to establish purposeful availment for specific personal jurisdiction?

                Show answer

                Neither fact alone is sufficient. A contract with a forum resident does not establish purposeful availment when the defendant did not deliberately target the forum or create continuing forum-related obligations; the court examines the parties’ actual relationship and conduct. Mere accessibility of a website is insufficient when the site is passive and not directed at or used to serve forum residents. Purposeful availment generally requires conduct deliberately directed toward the forum.

              5. 5. What is the constitutional standard for notice before judgment?

                Show answer

                Due process requires notice reasonably calculated, under all the circumstances, to inform interested persons of the action and give them an opportunity to respond.

              6. 6. What are the three elements of the Calder effects test for purposeful direction in intentional tort cases?

                Show answer

                1. An intentional act by the defendant; 2. Conduct expressly aimed at the forum state; and 3. Harm that the defendant knows is likely to be suffered in the forum state (the brunt of the harm is felt there).

              7. 7. Under the Federal Rules of Civil Procedure, how can a defendant waive the defense of lack of personal jurisdiction?

                Show answer

                The defense of lack of personal jurisdiction (Rule 12(b)(2)) is waived if omitted from the defendant's first Rule 12 motion, or, if no such motion is made, omitted from the responsive pleading or an amendment permitted as of right under Rule 15(a)(1).

              8. 8. What are the two stages of analysis for personal jurisdiction over a nonresident defendant in federal court, and which stage comes first?

                Show answer

                First, statutory authorization: Does the forum state’s long-arm statute reach the defendant? Second, constitutional authorization: Does the Constitution permit jurisdiction? The long-arm statute must be satisfied first; if it is narrower than the Constitution, jurisdiction is lacking even if constitutional contacts exist.

              9. 9. What is the standard for transferring a civil action under 28 U.S.C. § 1404(a), and how does it differ from § 1406(a)?

                Show answer

                Under § 1404(a), a court with proper venue may transfer the action for the convenience of the parties and witnesses and in the interest of justice to a district where it might have been brought or to which the parties consent. Under § 1406(a), if venue is improper, the court must dismiss or, in the interest of justice, transfer the action to a proper district.

              10. 10. Under the Hanna doctrine, when does a federal court apply a Federal Rule of Civil Procedure instead of state law in a diversity case?

                Show answer

                If a valid Federal Rule directly conflicts with or covers the issue, the court applies the Rule unless it violates the Rules Enabling Act or the Constitution; otherwise, the court applies Erie, generally using state substantive law and federal procedural law.

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