To file a motion to challenge jurisdiction in federal court, you submit a Rule 12(b) motion asking the judge to dismiss the case because the court has no authority over you (Rule 12(b)(2)) or no authority over this type of dispute (Rule 12(b)(1)), and you must do it before filing an answer to the complaint — within 21 days of being served with the summons.1Legal Information Institute. Federal Rules of Civil Procedure Rule 12 Miss that window, or answer the complaint first, and you can lose the defense for good.
The steps below walk through the two grounds you can raise, what belongs in the paperwork, how to file and serve it, and what happens next. State courts follow the same basic sequence, though local deadlines and forms vary.
Pick the Right Ground: Personal or Subject Matter
Your motion has to name which authority the court lacks. Sometimes both apply; usually one is the real argument.
Personal jurisdiction is the court’s power over you as a defendant. You challenge it when you have no meaningful connection to the state where you were sued — you don’t live there, your business isn’t based there, and the events in the complaint didn’t happen there. The plaintiff has to show your ties to the forum state are strong enough that being hauled into court there is fair, either because you’re essentially “at home” in the state or because the lawsuit itself arose from what you did there.2United States District Court for the District of Rhode Island. Defendant’s Rule 12(b)(2) Motion to Dismiss Every state also has a long-arm statute that spells out how far its courts can reach; your motion should explain why neither that statute nor the Constitution supports the court’s authority over you.3Legal Information Institute. Long-Arm Statute
Subject matter jurisdiction is whether the court can hear this category of case at all. In federal court, that usually comes down to federal question jurisdiction (the case involves federal law) or diversity jurisdiction, which requires complete diversity of citizenship between plaintiffs and defendants plus more than $75,000 at stake.4Legal Information Institute (LII). Diversity Jurisdiction If any plaintiff shares a home state with any defendant, diversity fails.
The difference between the two grounds matters for timing. Personal jurisdiction can be waived; subject matter jurisdiction cannot. A court can raise the subject matter question on its own at any stage, even on appeal, and dismiss a case if it turns out it never had authority to hear it.5Legal Information Institute. Sua Sponte
File Before You Answer
In federal court, you have 21 days from service of the summons and complaint to respond.1Legal Information Institute. Federal Rules of Civil Procedure Rule 12 A Rule 12(b) motion has to be filed before you submit an answer. If you answer first and don’t include the jurisdictional defense, the court treats that as consent to its authority over you.
The same logic applies to any other participation in the merits. Filing counterclaims, responding to discovery, or arguing the facts of the case before raising your jurisdictional challenge signals that you accept the court’s authority. Contesting jurisdiction is called a “special appearance” for that reason: you’re showing up only to argue the court can’t hear the case, not to litigate it.
Bundle Every Rule 12 Defense at Once
Rule 12(g) requires you to raise all available Rule 12 defenses in a single motion. Four defenses are permanently waived if you leave them out: lack of personal jurisdiction, improper venue, insufficient process, and insufficient service of process.6Advocate Magazine. Navigating Attacks on Your Pleadings in Federal Court So if you file a personal jurisdiction motion but forget improper venue, venue is gone. Review every possible Rule 12 defense before filing and include each one that could apply. Lack of subject matter jurisdiction is the exception — you can raise it later.
Assemble the Filing Package
Courts won’t take your word that jurisdiction is improper. You have to build the record.
The Motion Itself
Start with the case caption exactly as it appears on the complaint, the assigned case number, and the full legal names of every party.2United States District Court for the District of Rhode Island. Defendant’s Rule 12(b)(2) Motion to Dismiss Errors here can cause the clerk to reject or misfile the motion. Many courts offer blank motion templates through the clerk’s office or the court’s website.
The body states the rule you’re moving under (Rule 12(b)(1), 12(b)(2), or both), identifies the specific facts that defeat jurisdiction, and asks for dismissal. For personal jurisdiction, this means laying out your lack of ties to the forum state: no residence, no incorporation, no office or employees, no relevant conduct in the state. For subject matter jurisdiction, you might show the parties aren’t truly diverse or the amount in controversy falls below $75,000.
Memorandum of Points and Authorities
A supporting memorandum accompanies the motion and connects your facts to the governing law — the relevant long-arm statute, the constitutional minimum contacts standard, or the federal diversity requirements. This is where the legal argument lives. You should also prepare a notice of motion telling the opposing party the hearing date and what relief you’re asking for.
Declaration and Exhibits
Attach a sworn declaration or affidavit setting out the facts personally. In federal court, an unsworn declaration signed under penalty of perjury carries the same weight as a traditional sworn affidavit, as long as it includes the required penalty-of-perjury language.7Office of the Law Revision Counsel. 28 U.S. Code 1746 – Unsworn Declarations Under Penalty of Perjury Back the declaration up with documents: residency records, corporate registration filings, lease agreements, and business activity records all help show where you are and aren’t connected.
Filing and Serving the Motion
Submit the motion package to the court clerk. Most federal courts and many state courts require electronic filing through an approved e-filing system; some still accept paper filings at the clerk’s window. A modest filing fee may apply.
You also have to serve the opposing party — usually the plaintiff’s attorney — with a copy of everything you filed. Under the federal rules, any person at least 18 years old who isn’t a party to the case can handle service, and many defendants hire a professional process server.8Legal Information Institute. Federal Rule of Civil Procedure 4 – Summons The person delivering the papers completes a proof of service form recording the date, time, method, and recipient. File that proof of service with the court. Without it, the judge may refuse to hear the motion.
Ask for Jurisdictional Discovery If Facts Are Disputed
Sometimes the facts needed to resolve the jurisdictional question aren’t clear from the pleadings. Either side can ask the court for limited discovery aimed only at the jurisdictional issue — corporate records showing a company’s actual principal place of business, for example, or a deposition of a company officer about the scope of operations in the forum state.
In federal court, make this request through a formal written motion, not as a passing line in an opposition brief. Identify the specific information you want and the factual dispute it would resolve. Attaching draft discovery requests to the motion shows the court the request is focused and not a fishing expedition.
What Happens After You File
The court schedules a hearing where both sides argue. The plaintiff carries the burden of proving jurisdiction exists — you don’t have to disprove it.2United States District Court for the District of Rhode Island. Defendant’s Rule 12(b)(2) Motion to Dismiss The judge then issues a written order.
Three outcomes are common. If the court agrees it lacks jurisdiction, the case is dismissed, usually without prejudice, so the plaintiff can refile in a court that does have authority. In federal court, the judge can transfer the case instead of dismissing it: under 28 U.S.C. § 1631, a court that finds it lacks jurisdiction may transfer the action to any court where it could have been filed originally, if the transfer serves the interest of justice.9Office of the Law Revision Counsel. 28 U.S. Code 1631 – Transfer to Cure Want of Jurisdiction The case then proceeds in the receiving court as if it had been filed there on the original date.
If the motion is denied, you have to answer the complaint. In federal court, that deadline is 14 days after notice of the court’s denial.10United States Courts. U.S. Department of Justice Suggestion for Amendment to Federal Rule of Civil Procedure 12(a)(4)(A) That’s a tight turnaround. Have a draft answer ready before the hearing.
If Your Motion Is Denied
A denial of a jurisdictional challenge usually isn’t a final order, so you generally can’t appeal it right away under the federal final judgment rule. You’d raise the issue again on appeal after a final judgment. In narrow circumstances, the collateral order doctrine or a certified interlocutory appeal under 28 U.S.C. § 1292(b) can open a path to immediate review, but courts grant these sparingly.
Subject matter jurisdiction works differently. Because it can never be waived, you can raise it again at any point — in a motion for reconsideration, at trial, or on appeal. If the court truly lacked subject matter jurisdiction, any judgment it entered is void, no matter how far the case has gone. That’s why identifying the right ground at the start is worth the time it takes.