Federal Subject-Matter Jurisdiction: Federal Question, the Well-Pleaded Complaint Rule, Embedded Federal Issues, and Supplemental Jurisdiction

Subject-matter jurisdiction is the only defense in federal civil practice that cannot be waived, forfeited, cured by consent, or traded away in a settlement — and the only one a court of appeals will raise on its own, after judgment, to erase four years of litigation. That asymmetry is the reason this doctrine deserves more care than its share of the casebook suggests. A personal-jurisdiction objection not raised in the first responsive pleading is gone. A subject-matter objection is never gone.

This guide covers the grants that matter in practice, the rules that decide which side of the line a case falls on, and the twenty-year line of Supreme Court decisions that has quietly moved most filing deadlines out of jurisdiction and into ordinary claim-processing — a shift that changes what you can argue, when, and with what consequence.

Contents

• Why the rule is absolute
• The two principal grants
• The well-pleaded complaint rule
• Complete preemption
• Embedded federal issues: Smith, Merrell Dow, Grable, Gunn
• Supplemental jurisdiction under § 1367
• Removal and the § 1447(d) bar
• Jurisdictional or claim-processing? The Arbaugh line
• Standing as a jurisdictional limit
• Doctrines that look jurisdictional but are not
• Sequencing: what a court may decide first
• Practice checklist
• Frequently asked questions

Why the rule is absolute

Article III vests the judicial power in courts whose jurisdiction Congress defines, and the inferior federal courts have only the jurisdiction Congress gives them. Sheldon v. Sill settled in 1850 that Congress's power to ordain and establish lower courts carries the power to limit their jurisdiction — the statute, not Article III's outer bound, is the operative ceiling. Ex parte McCardle applied the same logic to the Supreme Court's appellate jurisdiction, dismissing a pending appeal because Congress had repealed the statute conferring it while the case was under submission.

The consequence, stated most often in Kokkonen v. Guardian Life Insurance Co.: "It is to be presumed that a cause lies outside this limited jurisdiction, and the burden of establishing the contrary rests upon the party asserting jurisdiction." That presumption operates at every stage. Capron v. Van Noorden let a losing plaintiff — the party who chose the forum — reverse his own judgment on appeal for want of jurisdiction he himself had failed to plead. Mansfield, C. & L.M. Railway Co. v. Swan restated the duty as the court's own: jurisdiction must be examined "on its own motion," and the rule "is inflexible and without exception."

Nor can the parties supply what Congress withheld. Insurance Corp. of Ireland v. Compagnie des Bauxites de Guinee drew the contrast cleanly: personal jurisdiction protects an individual liberty interest and is therefore waivable, while subject-matter jurisdiction "functions as a restriction on federal power" and no action of the parties can enlarge it. American Fire & Casualty Co. v. Finn vacated a judgment after trial on a removed case that never belonged in federal court, and made the point that still governs settlement risk: "the rule, springing from the nature and limits of the judicial power of the United States is inflexible and without exception."

There is one meaningful softening. Grubbs v. General Electric Credit Corp. held that once a removed case has gone to judgment on the merits, the reviewing court asks not whether removal was procedurally proper but whether the district court would have had original jurisdiction had the case been filed there. Caterpillar Inc. v. Lewis extended the practical version: a jurisdictional defect existing at removal but cured before judgment — there, a non-diverse party dismissed before trial — does not require vacatur, because "considerations of finality, efficiency, and economy become overwhelming" once judgment is entered. Compare Grupo Dataflux v. Atlas Global Group, L.P., which refused to extend that forgiveness to a party's post-filing change in citizenship: the time-of-filing rule survives, and a mid-litigation change in a party's own citizenship cannot cure what was missing at filing.

The two principal grants

Two statutes carry the overwhelming majority of federal civil filings.

Section 1331 has had no amount-in-controversy requirement since 1980. Everything else in federal-question practice is about the meaning of two words: arising under.

The phrase is not self-defining, and the Supreme Court has never pretended otherwise. In Osborn v. Bank of the United States, Chief Justice Marshall read the constitutional "arising under" broadly enough to reach any case in which a federal question "forms an ingredient of the original cause." Verlinden B.V. v. Central Bank of Nigeria confirms that the constitutional grant is that capacious — Congress may confer jurisdiction over a suit between two aliens where the only federal ingredient is the statutory framework supplying the rule of decision. But the statutory grant in § 1331 is read far more narrowly than Article III permits, and it is the statute you litigate.

Beyond §§ 1331 and 1332, the specialized grants matter more than their length suggests, because each carries its own rules:

• § 1333 — admiralty and maritime, exclusive but subject to the saving-to-suitors clause
• § 1334 — bankruptcy, with the referral to bankruptcy judges under § 157
• § 1338 — patents, plant variety, copyrights, and trademarks; exclusive as to patent and copyright
• § 1343 — civil rights, largely redundant of § 1331 since 1980
• § 1345 and § 1346 — the United States as plaintiff and as defendant
• § 1330 — foreign states under the FSIA
• § 1369 — multiparty, multiforum jurisdiction over single accidents killing 75 or more

A recurring trap: a statute that creates a cause of action does not necessarily create jurisdiction, and a jurisdictional statute does not create a cause of action. Skelly Oil Co. v. Phillips Petroleum Co. held that the Declaratory Judgment Act, 28 U.S.C. § 2201, "enlarged the range of remedies available in the federal courts but did not extend their jurisdiction" — you must find an independent basis, and you find it by asking what suit the declaratory defendant could have brought. Conversely, Textile Workers v. Lincoln Mills of Alabama read § 301 of the LMRA to supply both jurisdiction and a federal substantive rule of decision for collective-bargaining agreements.

The Federal Arbitration Act is the cleanest modern illustration. Vaden v. Discover Bank held that a court asked to compel arbitration under 9 U.S.C. § 4 must "look through" the petition to the underlying controversy to find federal-question jurisdiction. Badgerow v. Walters then held that the look-through approach does not extend to petitions to confirm or vacate an award under §§ 9 and 10, because those sections lack § 4's distinctive "save for" language. The practical result is a genuine oddity: the same arbitration may be compelled in federal court and confirmed only in state court.

The well-pleaded complaint rule

For most cases the whole inquiry collapses into one question: does the plaintiff's own properly pleaded complaint present a federal question? If not, there is no § 1331 jurisdiction, no matter how certain it is that federal law will decide the case.

Louisville & Nashville Railroad Co. v. Mottley is the canonical statement and worth restating precisely, because it is so often loosely described. The Mottleys sued on a contract for lifetime rail passes. They anticipated the railroad's defense — a new federal statute forbidding free passes — and pleaded around it, arguing the statute did not apply and would be unconstitutional if it did. The Supreme Court dismissed for want of jurisdiction on its own motion. A plaintiff may not create federal jurisdiction "by anticipating an invalid defense." Federal law was certain to control the case; it simply was not in the plaintiff's claim.

Gully v. First National Bank in Meridian supplied the standard the lower courts still quote: the federal right must be "an element, and an essential one, of the plaintiff's cause of action," and it must appear "unaided by anything alleged in anticipation or avoidance of defenses." Justice Cardozo's warning in that case remains the honest description of this doctrine: "To define broadly and in the abstract 'a case arising under the Constitution or laws of the United States' has hazards of a kindred order."

Three corollaries follow, and each one is a recurring fight.

The plaintiff is the master of the complaint. Caterpillar Inc. v. Williams holds that a plaintiff may avoid federal court by pleading only state-law claims, even where a federal claim was available on the same facts. That the defendant has a federal defense — even a preemption defense — does not convert the case. Franchise Tax Board v. Construction Laborers Vacation Trust applied the same rule to a state's declaratory suit: ERISA preemption as a defense to a state levy did not make the state's claim arise under federal law.

Declaratory posture does not change the analysis. Under Skelly Oil, you recast the declaratory action into the coercive suit it displaces and ask whether that complaint would have arisen under federal law. This is where most declaratory-judgment jurisdiction arguments fail.

Counterclaims do not count. Home Depot U.S.A., Inc. v. Jackson settled a long-running circuit dispute in 2019 by holding that a third-party counterclaim defendant is not a "defendant" who may remove under § 1441(a) or under CAFA's § 1453(b). The Court read "defendant" to mean the party sued by the original plaintiff. The four-Justice dissent's practical objection — that this lets a plaintiff structure around federal jurisdiction — is precisely the structuring that Caterpillar blesses.

Two further limits worth knowing. 28 U.S.C. § 1359 strips jurisdiction where a party has been "improperly or collusively made or joined to invoke the jurisdiction" — the anti-collusion rule, which polices assignment of claims to manufacture diversity but does not reach a plaintiff's choice of which claims to plead. And the traditional "arising under" test excludes suits that merely require a federal court to apply federal law to determine a fact: Shoshone Mining Co. v. Rutter held that an action to determine the right to a mining claim, though created by federal statute, did not arise under federal law because the rights turned on local custom and state law. The obverse is American Well Works Co. v. Layne & Bowler Co., where Justice Holmes announced the creation test — "a suit arises under the law that creates the cause of action" — which is still the starting point even though the Court has repeatedly held it is not the outer boundary.

Complete preemption

The one true exception to the master-of-the-complaint rule is complete preemption, and it is narrow by design. Where a federal statute not only preempts state law but substitutes a federal cause of action, a claim pleaded under state law is recharacterized as federal from the outset, and is removable.

The Court has recognized it in three settings:

1. LMRA § 301. Metropolitan Life Insurance Co. v. Taylor and the Lincoln Mills line — claims founded on rights created by a collective-bargaining agreement.
2. ERISA § 502(a). Aetna Health Inc. v. Davila set the operative two-part test: a claim is completely preempted if the plaintiff could have brought it under 29 U.S.C. § 1132(a)(1)(B) and no other independent legal duty is implicated. Distinguish this from ERISA's much broader defensive preemption under § 514, addressed in Shaw v. Delta Air Lines, Inc. — ordinary preemption is a defense, not a jurisdictional key.
3. National Bank Act usury. Beneficial National Bank v. Anderson held state usury claims against a national bank completely preempted by 12 U.S.C. §§ 85–86.

Everything else is ordinary preemption, which belongs in an answer, not a notice of removal. The single most common removal error in practice is treating a strong preemption defense as complete preemption, and the second most common is forgetting that a completely preempted claim must also be one the plaintiff could have brought federally — Davila's second prong.

Embedded federal issues: Smith, Merrell Dow, Grable, Gunn

A small but consequential category: a state-created claim whose resolution turns on a contested federal question. Whether that supports § 1331 jurisdiction has been the least stable corner of this doctrine.

Smith v. Kansas City Title & Trust Co. started it in 1921. A shareholder sued under Missouri law to stop a trust company from buying federal farm-loan bonds, alleging the bonds were unconstitutional. Jurisdiction existed: the state-law claim's success depended entirely on a federal constitutional question. Compare Moore v. Chesapeake & Ohio Railway Co. thirteen years later, which found no jurisdiction over a state employer-liability claim that incorporated federal safety standards. Smith and Moore are hard to reconcile on their reasoning and the Court has never fully squared them.

Merrell Dow Pharmaceuticals Inc. v. Thompson then held that a state tort claim premised on an alleged FDCA labeling violation did not arise under federal law, reasoning heavily from the absence of a federal private right of action. For nearly twenty years many courts read Merrell Dow as effectively requiring a federal cause of action.

Grable & Sons Metal Products, Inc. v. Darue Engineering & Manufacturing corrected that reading in 2005 and remains the governing framework. Grable's quiet-title claim turned on whether the IRS had given notice complying with 26 U.S.C. § 6335. The Court held jurisdiction proper and rejected the idea that Merrell Dow created a "missing federal cause of action" rule, describing the absence of a private right as "evidence relevant to, but not dispositive of," the inquiry. The operative question is whether the state claim "necessarily raise[s] a stated federal issue, actually disputed and substantial, which a federal forum may entertain without disturbing any congressionally approved balance of federal and state judicial responsibilities."

Gunn v. Minton restated Grable as four conjunctive requirements and is the citation to use today. The federal issue must be:

1. necessarily raised,
2. actually disputed,
3. substantial — meaning substantial to the federal system as a whole, not merely important to the parties, and
4. capable of resolution in federal court without disrupting the federal-state balance.

Gunn is also the better teaching case because it failed the test. A legal-malpractice claim against patent counsel required the state court to decide a hypothetical patent question — necessarily raised and actually disputed — yet was not substantial, because the federal patent issue was "backward-looking" and hypothetical: no actual patent right would be affected by the state court's answer. The unanimous Court also noted that it had already held in 28 U.S.C. § 1338 cases that state courts can competently handle embedded patent questions.

Empire HealthChoice Assurance, Inc. v. McVeigh is the case for the "fact-bound and situation-specific" disqualifier — a reimbursement claim under a federal-employee health plan turned on distributing a state tort settlement, which the Court found too particularized to be substantial. And Merrill Lynch, Pierce, Fenner & Smith Inc. v. Manning held in 2016 that the Exchange Act's exclusive-jurisdiction provision, 15 U.S.C. § 78aa(a), reaches only suits "brought to enforce" a duty created by the Act — which the Court construed to mean the same thing as § 1331's "arising under," collapsing the two tests and rejecting a broader "necessarily raised" reading in that context.

A practical note on Rockwell International Corp. v. United States: jurisdiction is measured against the complaint as it finally stood after amendment, not the original pleading, at least where the plaintiff's own amendment abandoned the jurisdiction-supporting allegations. This matters for amendment strategy after a § 1331 challenge.

Supplemental jurisdiction under § 1367

Before 1990 this was judge-made doctrine under two labels. United Mine Workers of America v. Gibbs created pendent jurisdiction over state claims sharing a "common nucleus of operative fact" with a federal claim such that the whole would ordinarily be tried in one proceeding. Ancillary jurisdiction covered claims by parties other than the plaintiff. Owen Equipment & Erection Co. v. Kroger limited it: a plaintiff in a diversity case could not assert a claim against a non-diverse third-party defendant, because that would let the plaintiff accomplish by joinder what § 1332 forbids directly. Then Finley v. United States held in 1989 that an FTCA plaintiff could not add state-law claims against additional defendants, and stated that further expansion was for Congress.

Congress responded the next year with 28 U.S.C. § 1367, which codified and rearranged the whole field:

• § 1367(a) grants jurisdiction over all claims "so related" to the anchor claims that they "form part of the same case or controversy under Article III," expressly including claims that join additional parties — overruling Finley.
• § 1367(b) carves back, in cases whose only anchor is diversity, claims by plaintiffs against persons joined under Rule 14, Rule 19, Rule 20, or Rule 24, where doing so would be inconsistent with § 1332 — codifying Kroger.
• § 1367(c) lists the four discretionary grounds for declining: novel or complex state issues, state claims that substantially predominate, dismissal of all anchor claims, and "exceptional circumstances" with compelling reasons.
• § 1367(d) tolls the state limitations period for 30 days after dismissal.

Three decisions do most of the work in applying it.

City of Chicago v. International College of Surgeons confirmed that § 1367(a) reaches state-law claims requiring on-the-record review of a local administrative decision, and stressed that § 1367(c) discretion — not a jurisdictional bar — is the right tool when that review is unwelcome in federal court.

Exxon Mobil Corp. v. Allapattah Services, Inc. resolved a deep circuit split in 2005: in a diversity class action or multi-plaintiff case where at least one plaintiff satisfies the amount in controversy, § 1367(a) supplies jurisdiction over the claims of co-plaintiffs who do not, because § 1367(b) does not except claims by plaintiffs joined under Rule 20 against the original defendant. The Court was explicit that this "displaced" the older contrary rule of Zahn v. International Paper Co.. Note carefully what Allapattah did not change: the complete diversity requirement is untouched, so one non-diverse plaintiff still destroys jurisdiction while one under-$75,000 plaintiff does not.

Artis v. District of Columbia construed the § 1367(d) tolling provision in 2018, holding 5–4 that "tolled" means the state clock is suspended (stop-the-clock) for the duration of the federal action, not merely that a 30-day grace period runs after dismissal. For a plaintiff whose state claims are dismissed under § 1367(c)(3) after years in federal court, the difference is frequently the difference between a live claim and a dead one.

Two sovereign-immunity wrinkles: Raygor v. Regents of the University of Minnesota held § 1367(d) does not toll claims against a state that were dismissed on Eleventh Amendment grounds, and Jinks v. Richland County upheld § 1367(d) as applied to political subdivisions as a valid exercise of the Necessary and Proper Clause.

The most common practical mistake here is treating § 1367(c)(3) as automatic. When the federal anchor is dismissed early, dismissal of the state claims is the usual outcome — but it is discretionary, and a court that has invested substantially may retain them. Preserve the argument either way; do not assume.

Removal and the § 1447(d) bar

Removal is where subject-matter jurisdiction meets the clock. The mechanics live in § 1441 (general), § 1442 (federal officers), § 1443 (civil rights), § 1446 (procedure and the 30-day clock), § 1453 (class actions), and § 1454 (patent and plant variety).

The distinction that governs appellate review is between jurisdictional and non-jurisdictional remand grounds. § 1447(c) requires remand if the court "lacks subject matter jurisdiction" and gives defects in removal procedure a 30-day objection window. § 1447(d) then bars review of remand orders "except" those under §§ 1442 and 1443 — and the Court reads that bar to reach only remands on the grounds specified in § 1447(c).

• Powerex Corp. v. Reliant Energy Services, Inc. — a remand characterized by the district court as for lack of subject-matter jurisdiction is unreviewable even if that characterization was wrong, so long as it was colorable.
• Carlsbad Technology, Inc. v. HIF Bio, Inc. — a remand of state claims under § 1367(c) is a discretionary remand, not a § 1447(c) jurisdictional one, and therefore is reviewable.
• BP p.l.c. v. Mayor and City Council of Baltimore — when any defendant removes in part under § 1442 or § 1443, the § 1447(d) exception opens the entire remand order to appellate review, not merely the federal-officer ground. This 2021 decision reshaped the climate-change removal litigation and is now the standard citation for scope of review.

On the amount in controversy in removal, Dart Cherokee Basin Operating Co. v. Owens holds that a notice of removal need only plausibly allege the amount — evidence is required only if the plaintiff or court contests it. Standard Fire Insurance Co. v. Knowles rejected the tactic of stipulating away class damages to defeat CAFA, and Mississippi ex rel. Hood v. AU Optronics Corp. held a state's parens patriae suit is not a CAFA "mass action" because the State is the only named plaintiff.

Finally, Royal Canin U.S.A., Inc. v. Wullschleger, decided in January 2025, resolved a recurring post-removal question: when a plaintiff amends after removal to delete every federal claim, the district court loses both § 1331 jurisdiction and § 1367 supplemental jurisdiction over the remaining state claims, and must remand. The unanimous opinion rejected the argument that the original complaint permanently fixes jurisdiction, reasoning that § 1367(a) requires a live anchor. This is now the controlling authority on amendment-to-defeat-removal, and it gives plaintiffs a reliable path back to state court that many circuits had closed.

Jurisdictional or claim-processing? The Arbaugh line

The most consequential development in this area over the past twenty years is not a new grant of jurisdiction. It is the Supreme Court's sustained campaign to stop calling things jurisdictional that are not.

The stakes are concrete. A jurisdictional requirement can be raised at any time, by any party or the court, cannot be waived or forfeited, is not subject to equitable exceptions, and is not amenable to estoppel. A claim-processing rule must be raised on time or it is forfeited, and is generally open to waiver, tolling, and estoppel. Miscategorizing one as the other changes who wins.

Arbaugh v. Y & H Corp. is the hinge. Title VII applies to employers with 15 or more employees. The defendant raised that threshold for the first time after a jury verdict for the plaintiff, and the district court — believing it jurisdictional — vacated the judgment and dismissed. A unanimous Court reversed and announced the bright-line rule that still controls: when Congress does not rank a threshold requirement as jurisdictional, courts should treat it as an element of the claim. The employee-numerosity requirement appears in Title VII's definitional section, not its jurisdictional provision, so it is an element — and the objection came too late.

Arbaugh also supplied the vocabulary courts now use, deprecating "drive-by jurisdictional rulings" that had "more than modest" consequences.

The line of cases applying it is now long, and the direction is nearly uniform:

The clear counterexample, and the one to watch for, is Bowles v. Russell: the time limit for filing a notice of appeal from a district court to a court of appeals, set by 28 U.S.C. § 2107, is jurisdictional, because it is fixed by statute rather than by rule. Bowles lost his appeal because he filed within the time the district court had (erroneously) granted him but outside the statute, and the Court overruled its own "unique circumstances" cases to say so.

Hamer v. Neighborhood Housing Services of Chicago sharpens the Bowles rule into a usable test. The Court unanimously distinguished the statutory deadline in § 2107 from the rule-based limit in Fed. R. App. P. 4(a)(5)(C), holding that a time limit prescribed only by a court-made rule is a non-jurisdictional claim-processing rule. The operating principle is now: if Congress wrote the deadline into a statute, it may well be jurisdictional; if it appears only in a rule, it is not. Nutraceutical Corp. v. Lambert confirms the corollary that a non-jurisdictional rule can still be mandatory and not subject to equitable tolling when its text is unconditional — there, the 14-day deadline in Rule 23(f).

A further refinement worth noting: Waetzig v. Halliburton Energy Services, decided in 2025, held that a voluntary dismissal without prejudice under Rule 41(a) counts as a "final proceeding" that a district court may reopen under Rule 60(b). That gives a practical route back into a closed case that many practitioners assumed was unavailable.

Standing as a jurisdictional limit

Article III standing is subject-matter jurisdiction by another name, and it carries all the same consequences: raisable at any time, never waivable, fatal whenever discovered. Lujan v. Defenders of Wildlife states the three elements — injury in fact, causation, redressability — and assigns the burden to the party invoking federal jurisdiction, with the showing required escalating from pleading through summary judgment to trial.

Three modern decisions have made standing a live defense in cases where it once was assumed.

Spokeo, Inc. v. Robins held that a statutory violation alone does not establish injury in fact: the injury must be both particularized and concrete, and Congress cannot erase the concreteness requirement by creating a private right of action for a bare procedural violation.

TransUnion LLC v. Ramirez applied that in the class context with real teeth. Of 8,185 class members whose credit files carried an inaccurate OFAC terrorist alert, only 1,853 had the information disseminated to a third party. The Court held the remaining 6,332 lacked standing, because "the mere presence of an inaccuracy in an internal credit file, if it is not disclosed to a third party, causes no concrete harm." The now-ubiquitous phrase from the opinion — "No concrete harm, no standing" — has reshaped consumer class-action practice, because standing must be established for every class member seeking individual damages.

FDA v. Alliance for Hippocratic Medicine and Murthy v. Missouri, both decided in June 2024, tightened causation. Alliance held that doctors who neither prescribe nor use mifepristone lacked standing to challenge FDA's regulation of it, rejecting theories built on conscience injuries, downstream economic effects, and organizational diversion of resources. Murthy held that plaintiffs challenging federal communications with social-media platforms failed to trace their content moderation to government pressure, emphasizing that on a preliminary-injunction motion the plaintiff must show a substantial risk of future injury traceable to the defendant. United States v. Texas added the related principle that a State generally lacks standing to challenge federal non-enforcement of the immigration laws.

Two decisions run the other way and are worth keeping in the file. Uzuegbunam v. Preczewski held that a request for nominal damages can by itself satisfy redressability for a completed constitutional violation. And Diamond Alternative Energy, LLC v. EPA, decided in June 2025, found fuel producers had standing to challenge California's vehicle-emissions standards on a predictable-market-response theory, reaffirming that "commonsense economic reasoning" can supply causation where the regulated market's response is foreseeable. Compare Lackey v. Stinnie (2025), holding that a plaintiff who wins only a preliminary injunction and never obtains final relief is not a "prevailing party" entitled to fees under 42 U.S.C. § 1988 — a reminder that standing to sue and entitlement to remedy are separate questions.

Related justiciability doctrines that are equally jurisdictional: mootness, ripeness, the political-question doctrine, and the bar on advisory opinions. Steel Co. v. Citizens for a Better Environment forbids "hypothetical jurisdiction" — a court may not assume jurisdiction to reach an easier merits question, because "the first and fundamental question is that of jurisdiction."

Doctrines that look jurisdictional but are not

Several familiar doctrines are often argued as jurisdictional and are not — or are jurisdictional only in a narrow sense.

Rooker-Feldman. Derived from Rooker v. Fidelity Trust Co. and District of Columbia Court of Appeals v. Feldman, the doctrine bars a federal district court from reviewing a state-court judgment. For decades the lower courts expanded it into a general bar on claims "inextricably intertwined" with state judgments. Exxon Mobil Corp. v. Saudi Basic Industries Corp. stopped that expansion cold in 2005, confining the doctrine to "cases brought by state-court losers complaining of injuries caused by state-court judgments rendered before the district court proceedings commenced and inviting district court review and rejection of those judgments." Parallel litigation, and claims that merely share issues with a state case, are governed by preclusion and abstention — not by Rooker-Feldman. Reed v. Goertz applied the narrowed version in 2023, allowing a § 1983 procedural due process challenge to a state DNA-testing statute to proceed.

The probate exception. Marshall v. Marshall confined it to three things: probating a will, administering an estate, and disposing of property in the custody of a state probate court. A tortious-interference-with-inheritance claim between two individuals is none of those and belongs in federal court if the jurisdictional requirements are met.

Abstention. Younger v. Harris and Colorado River Water Conservation District v. United States are discretionary doctrines resting on comity and judicial administration, not on any absence of power. Colorado River in particular describes the federal courts' "virtually unflagging obligation" to exercise the jurisdiction given them, and permits a stay only in "exceptional circumstances."

Forum non conveniens. Sinochem International Co. v. Malaysia International Shipping Corp. is the key case for the sequencing point developed below: a court may dismiss on forum non conveniens grounds without first resolving subject-matter jurisdiction, because that dismissal is a non-merits determination.

Article I adjudication. Whether a non-Article III tribunal may finally decide a claim is a structural question that resembles jurisdiction and behaves differently. Stern v. Marshall held a bankruptcy court could not enter final judgment on a state-law counterclaim, but Wellness International Network, Ltd. v. Sharif then held that litigant consent — even implied consent — can cure the defect, precisely because the Article III right at issue is a personal one rather than an absolute limit on subject-matter jurisdiction. That is the reverse of the subject-matter rule and a useful contrast for understanding why consent works in one setting and not the other. Compare SEC v. Jarkesy (2024), holding the Seventh Amendment entitles a defendant facing SEC civil penalties for fraud to a jury trial in an Article III court.

Statutory channeling. Where Congress creates an exclusive administrative-review scheme, district-court jurisdiction may be displaced. Thunder Basin Coal Co. v. Reich supplies the three-factor test, and Elgin v. Department of the Treasury applied it to CSRA review. But Axon Enterprise, Inc. v. FTC held in 2023 that structural constitutional challenges to an agency's existence — removal protections, ALJ appointments — are not the type of claim Congress channeled, so district courts retain § 1331 jurisdiction over them. Corner Post, Inc. v. Board of Governors then held that an APA claim accrues when the plaintiff is injured, not when the rule is published, reopening challenges to long-settled regulations.

Sequencing: what a court may decide first

Steel Co. forbids hypothetical jurisdiction, but that prohibition is narrower than it first appears, and knowing its edges is often decisive in a case with both a jurisdictional and a dispositive non-merits defense.

Ruhrgas AG v. Marathon Oil Co. holds that a district court may dismiss for lack of personal jurisdiction without first deciding subject-matter jurisdiction. There is no "unyielding jurisdictional hierarchy," and where the subject-matter question is difficult and novel while the personal-jurisdiction question is straightforward, judicial economy favors the easier route. Sinochem extended the same reasoning to forum non conveniens.

The unifying principle: a court may resolve any non-merits threshold question in whatever order makes sense. What it may not do is reach the merits without jurisdiction. Steel Co. bars assuming jurisdiction to rule for a defendant on the merits; Ruhrgas and Sinochem permit choosing among threshold grounds.

One more sequencing tool: 28 U.S.C. § 1631 lets a court that finds it lacks jurisdiction transfer the action to a court that has it, preserving the original filing date. This is routinely overlooked and can save a claim that a dismissal would kill.

Practice checklist

Drafting a complaint in federal court. Plead the jurisdictional basis explicitly and by statute, as Rule 8(a)(1) requires. For diversity, plead the citizenship of every party — for an LLC, that means every member's citizenship, traced through any entity layers, under the rule that Hertz Corp. v. Friend leaves untouched for unincorporated entities. For federal-question, identify the federal law creating the claim; if you are relying on an embedded issue, plead the Gunn elements on the face of the complaint.

Challenging jurisdiction. Bring it under Rule 12(b)(1) and decide deliberately whether the attack is facial (accepting the pleaded allegations, converting the motion into something close to a 12(b)(6) analysis) or factual (contesting the allegations with evidence, where the court may weigh proof and the plaintiff bears the burden without the benefit of the pleading presumption). The choice affects your evidentiary submission and the standard of review. Unlike 12(b)(6), a 12(b)(1) motion is never waived by omission from an earlier motion.

Defending jurisdiction. Check three things before you respond on the merits: (1) whether the challenged requirement is actually jurisdictional under the Arbaugh framework, which will often convert an unwaivable defect into a forfeited defense; (2) whether any defect can be cured — by dismissing a dispensable non-diverse party under Rule 21, by amendment under Rule 15, or by transfer under § 1631; and (3) whether the case has progressed far enough that Caterpillar v. Lewis finality reasoning protects a judgment.

Removing. Calculate the 30-day clock from the right trigger under § 1446(b), and remember the one-year outer limit for diversity removals absent bad faith. Plausibly allege the amount in controversy under Dart Cherokee rather than over-documenting it. If you have a § 1442 federal-officer ground, plead it — under BP v. Baltimore it opens the whole remand order to review. And after Royal Canin, expect a plaintiff to try amending away the federal claims post-removal.

Opposing removal. Move to remand within 30 days for procedural defects, because those forfeit. Jurisdictional defects do not, so lead with them if you have them. A remand order grounded in § 1447(c) is generally unreviewable under Powerex; one grounded in § 1367(c) discretion is reviewable under Carlsbad.

Preserving the record. Because a jurisdictional defect survives everything, raise it the moment you find it — including on appeal, including after judgment. Correspondingly, if you are defending a judgment, confirm the jurisdictional record is complete before the appeal, because the court of appeals will look whether or not anyone asks.

Frequently asked questions

Can the parties agree to federal jurisdiction?

No. Subject-matter jurisdiction limits federal judicial power, not a party's personal rights, so no consent, stipulation, waiver, or contractual forum-selection clause can create it. Insurance Corp. of Ireland draws the contrast with personal jurisdiction, which is waivable precisely because it protects an individual liberty interest. A forum-selection clause naming a federal court is enforceable only if that court would independently have jurisdiction.

How late can a subject-matter jurisdiction objection be raised?

At any point, including for the first time on appeal, and the court must raise it on its own motion under Mansfield v. Swan if no one does. Capron v. Van Noorden allowed a losing plaintiff to overturn his own judgment on that ground. The practical qualification is Caterpillar v. Lewis: a defect that existed at removal but was cured before final judgment will not require vacatur once judgment is entered.

What is the difference between a jurisdictional rule and a claim-processing rule?

A jurisdictional rule defines the court's power: it cannot be waived or forfeited, is not subject to equitable exceptions, and must be enforced whenever noticed. A claim-processing rule regulates the parties' conduct: it is forfeited if not timely raised, and may be subject to waiver, tolling, or estoppel. Arbaugh directs courts to treat a threshold as jurisdictional only when Congress has clearly said so, and the dozen cases in the table above show how strongly the Court has pushed deadlines and exhaustion requirements onto the claim-processing side. The main survivor is the statutory appeal deadline in Bowles v. Russell, which Hamer confirms turns on whether the deadline sits in a statute or only in a rule.

Does a federal defense create federal jurisdiction?

No. That is the holding of Mottley, and the rule survives intact. A defendant with a federal defense — including ordinary preemption — must raise it in state court and, if necessary, seek Supreme Court review under 28 U.S.C. § 1257. The exception is complete preemption under LMRA § 301, ERISA § 502(a), or the National Bank Act's usury provisions, where the state claim is recharacterized as federal and becomes removable.

When does a state-law claim arise under federal law?

Only when it satisfies all four Gunn requirements: the federal issue is necessarily raised, actually disputed, substantial to the federal system as a whole, and resolvable in federal court without disturbing the federal-state balance. Grable illustrates success — an IRS notice requirement controlling a quiet-title claim. Gunn itself and Empire HealthChoice illustrate failure: hypothetical or fact-bound federal questions are not substantial, however important they are to the litigants.

If the federal claim is dismissed, must the state claims go too?

No — it is discretionary under § 1367(c)(3), not automatic. Dismissal is the common outcome, particularly early in a case, but a court that has invested substantial resources may retain the state claims, and International College of Surgeons emphasizes that this is a discretionary judgment rather than a jurisdictional command. If the state claims are dismissed, Artis v. District of Columbia means § 1367(d) suspended the state limitations clock for the entire federal pendency, not merely for 30 days after.

Does removal jurisdiction disappear if the plaintiff amends away the federal claims?

Yes, after Royal Canin U.S.A. v. Wullschleger (2025). A unanimous Court held that when a post-removal amendment deletes every federal claim, the district court loses § 1331 jurisdiction and § 1367 supplemental jurisdiction along with it, and must remand the remaining state claims. This overturned the contrary practice in several circuits and gives plaintiffs a dependable route back to state court.

Is standing really subject-matter jurisdiction?

Yes, and it behaves identically: it may be raised at any time, cannot be waived, and defeats the case whenever it fails. TransUnion makes the point most sharply in the class context — standing must be shown for every class member seeking individual damages, so a class certified without regard to it can lose most of its members at judgment. Steel Co. forbids bypassing standing to reach an easier merits question.

This guide covers the law as of September 2026. Every case and statute above links to its full text on LawDiver. For the jurisdictional requirements specific to diversity cases, see the companion guide on federal diversity jurisdiction. For the limits on reaching a particular defendant once subject-matter jurisdiction exists, see personal jurisdiction over individuals and personal jurisdiction over corporations.