A sample 12(b)(6) motion to dismiss is a written motion, filed before the answer, arguing that even if every factual allegation in the complaint is true, the complaint fails to state a claim on which relief can be granted. Getting one right is a matter of hitting the filing deadline, applying the plausibility standard from Twombly and Iqbal claim by claim, and complying with the federal rules on format, signature, and service. The sections below walk through what the motion must contain, when it must be filed, and what happens after the court rules.
When the Motion Must Be Filed
A 12(b)(6) motion has to be filed before the defendant answers the complaint. Under Rule 12(a)(1)(A), the default response deadline is 21 days after service of the summons and complaint. If the defendant waived formal service under Rule 4(d), that window extends to 60 days after the waiver request was sent.1Legal Information Institute. Federal Rules of Civil Procedure Rule 12 – Defenses and Objections Filing the motion in place of an answer pauses that clock until the court rules.
Rule 12(g)(2) then imposes a consolidation requirement that trips up many practitioners. If a defendant files any Rule 12 motion, a second Rule 12 motion raising a defense that was available but omitted from the first is generally barred. Challenges to personal jurisdiction, venue, or service of process have to be packaged into the same motion as the 12(b)(6) argument. Under Rule 12(h)(1), those four defenses are waived entirely if left out of both the initial Rule 12 motion and the answer.1Legal Information Institute. Federal Rules of Civil Procedure Rule 12 – Defenses and Objections Failure to state a claim is more forgiving and can be raised as late as trial, but there is no tactical reason to hold it back when the complaint’s deficiencies are on its face.
Reading the Complaint Before You Draft
The drafting starts with pulling the complaint apart. A single complaint may allege breach of contract, negligence, and fraud in the same document, and each cause of action has its own required elements under the applicable substantive law. Isolate every claim and write out what the plaintiff has to prove for each.
Then go through the factual allegations line by line, matching each to the element it is meant to support. This is where the weaknesses surface. The plaintiff may allege breach of contract but never identify the specific agreement, or claim fraud without describing what the defendant actually said. The point is to find claims where at least one required element rests on nothing but a bare conclusion. A motion that only targets claims with real defects is stronger than one that swings at everything; attacking a well-pleaded claim wastes the court’s attention and dilutes the arguments that matter.
The Plausibility Standard the Motion Has to Satisfy
Every 12(b)(6) motion lives or dies by the plausibility standard. Federal Rule of Civil Procedure 8(a)(2) requires a complaint to contain “a short and plain statement of the claim showing that the pleader is entitled to relief.”2Legal Information Institute. Federal Rules of Civil Procedure Rule 8 – General Rules of Pleading What that language actually demands was reshaped by the Supreme Court in 2007 and 2009.
In Bell Atlantic Corp. v. Twombly, the Court held that factual allegations must raise the right to relief “above the speculative level” and provide “enough facts to state a claim to relief that is plausible on its face.” Probability is not required at the pleading stage, but a complaint that alleges facts merely consistent with liability “stops short of the line between possibility and plausibility.”3Justia U.S. Supreme Court. Bell Atlantic Corp. v. Twombly, 550 U.S. 544 (2007)
Two years later, Ashcroft v. Iqbal turned Twombly into a two-step framework. First, the court identifies allegations that are merely legal conclusions rather than factual statements; those “are not entitled to the assumption of truth.” Second, the court takes the remaining well-pleaded factual allegations as true and asks whether they “plausibly give rise to an entitlement to relief.”4Justia U.S. Supreme Court. Ashcroft v. Iqbal, 556 U.S. 662 (2009) A successful motion shows that the complaint fails one or both steps.
What the Court Will Look At
On a 12(b)(6) motion, the court is confined to a narrow record: the complaint itself, documents attached to or referenced in the complaint, and matters subject to judicial notice, such as public records. This limit is one of the motion’s defining features and one of its biggest traps. If either party introduces outside materials and the court does not exclude them, Rule 12(d) requires conversion of the motion into one for summary judgment under Rule 56, and all parties then get a reasonable opportunity to submit additional evidence.1Legal Information Institute. Federal Rules of Civil Procedure Rule 12 – Defenses and Objections
Conversion changes the entire proceeding. The court is no longer asking whether the complaint states a plausible claim; it is asking whether there is a genuine dispute of material fact, a much more demanding standard that requires evidence rather than allegations. A defendant who inadvertently triggers conversion by attaching an affidavit or exhibit can end up in a procedural posture they did not choose and are not prepared for. The safe path is to rely exclusively on the four corners of the complaint and materials already incorporated into it.
How to Lay the Document Out
Rule 7(b) requires every motion to be in writing, state the grounds for the requested order with particularity, and state the relief sought.5Legal Information Institute. Federal Rules of Civil Procedure Rule 7 – Pleadings Allowed; Form of Motions and Other Papers In practice, a 12(b)(6) motion is filed alongside a memorandum of law that contains the detailed legal argument. The motion itself can be short; the memorandum does the work.
The document opens with a caption meeting Rule 10(a), which requires the court’s name, a title identifying the parties, a file number, and a designation of the document.6Legal Information Institute. Federal Rules of Civil Procedure Rule 10 – Form of Pleadings Below the caption, the introduction states the relief requested in one or two sentences: dismissal of the entire complaint, or dismissal of specific counts.
Most federal district courts impose page or word limits on memoranda through their local rules. When a memorandum exceeds those limits (which usually requires leave of court), a table of contents and table of authorities may be required. The body typically contains a concise statement of facts drawn from the complaint, then the legal argument organized by claim, then a conclusion requesting the specific relief, then a signature block. Under Rule 11(a), every motion must be signed by at least one attorney of record and include the signer’s address, email address, and telephone number.7Legal Information Institute. Federal Rules of Civil Procedure Rule 11 – Signing Pleadings, Motions, and Other Papers
Building the Argument Section
The argument section is where the motion succeeds or fails. Open by stating the framework: the court accepts well-pleaded factual allegations as true, disregards conclusory statements, and requires the complaint to cross from conceivable to plausible. Citing Twombly and Iqbal here is standard, but reciting the standard alone accomplishes nothing. The argument earns its keep by applying that standard to specific allegations.
Organize claim by claim. For each cause of action being challenged, list the required elements, walk through the complaint’s allegations, and identify what is missing. Specificity matters more than eloquence. If the plaintiff alleges breach of contract but never identifies the terms that were breached, say so directly. If a fraud claim rests on vague assertions that the defendant “made misrepresentations” without describing what was said, when, or to whom, point out that these are exactly the conclusory allegations Iqbal instructs courts to disregard.
Support each argument with controlling case law from the relevant circuit or district. A motion that cites only the Supreme Court’s general plausibility language, without showing how courts in the same jurisdiction have applied it to similar claims, leaves the judge to do work the movant should have done. Cite cases where courts dismissed complaints with comparable defects. Distinguish cases where complaints survived by pointing to the allegations that were present there and absent here. The strongest motions make the gap between the complaint and the legal standard feel obvious on the page.
Filing and Serving the Motion
In federal court, a represented party must file documents electronically unless the court allows otherwise. The Case Management/Electronic Case Files (CM/ECF) system is the federal judiciary’s platform for online submission.8United States Courts. Electronic Filing (CM/ECF) Before uploading, verify that the document meets the court’s technical specifications for format and file size and that it complies with local formatting rules.
Service on opposing counsel happens simultaneously with filing. Under Rule 5(b)(2)(E), sending a document to a registered CM/ECF user by filing it with the court’s electronic filing system counts as valid service, and service is complete upon filing.9Legal Information Institute. Federal Rules of Civil Procedure Rule 5 – Serving and Filing Pleadings and Other Papers No separate certificate of service is required when the paper is served that way. When service is accomplished by other means, a certificate of service must be filed with the document or within a reasonable time after service.
Signing and filing the motion triggers the Rule 11(b) certifications: the motion is not filed for any improper purpose, and the legal contentions are warranted by existing law or a nonfrivolous argument for changing it.7Legal Information Institute. Federal Rules of Civil Procedure Rule 11 – Signing Pleadings, Motions, and Other Papers A 12(b)(6) motion filed purely to delay or impose costs can expose the filing attorney to sanctions.
What Happens After the Court Rules
Once the motion is filed, the court sets a briefing schedule. The plaintiff files an opposition and the defendant may file a reply. Some judges hold oral argument; many decide on the papers alone.
If the Motion Is Denied
A denial means the court found the complaint sufficiently pleaded, and the case moves into discovery. Under Rule 12(a)(4)(A), when the court denies a Rule 12 motion or postpones it until trial, the defendant must serve a responsive pleading within 14 days after notice of the court’s action.1Legal Information Institute. Federal Rules of Civil Procedure Rule 12 – Defenses and Objections That clock starts immediately, so a draft answer should be ready before the ruling comes down. The failure-to-state-a-claim defense is not waived by a denial and can be reasserted at trial, though the practical chances of the same arguments succeeding drop once the case has moved forward.
If the Motion Is Granted
A granted 12(b)(6) motion results in dismissal, but the type of dismissal matters. In federal practice, a dismissal under Rule 12(b)(6) is generally presumed to be with prejudice unless the court says otherwise. A dismissal with prejudice is a final judgment on the merits; the plaintiff cannot refile the same claims. A dismissal without prejudice allows the plaintiff to try again with a revised complaint.
In practice, courts routinely grant leave to amend rather than dismissing with prejudice on the first pass, especially when the plaintiff has not previously tried to fix the deficiencies. Rule 15(a)(2) instructs courts to “freely give leave when justice so requires.”10Legal Information Institute. Federal Rules of Civil Procedure Rule 15 – Amended and Supplemental Pleadings The Supreme Court in Foman v. Davis identified circumstances that justify denying leave, including undue delay, bad faith, repeated failure to cure deficiencies, undue prejudice to the opposing party, and futility.11Justia U.S. Supreme Court. Foman v. Davis, 371 U.S. 178 (1962) Futility is the factor that matters most in the 12(b)(6) context: if no set of facts could cure the defect, amendment is futile and dismissal with prejudice is appropriate.
When the court grants leave, the plaintiff typically has a set number of days (often 14 to 30, as the court directs) to file an amended complaint. If one is filed, the defendant runs the same analysis again: review the amended allegations, determine whether they now satisfy the plausibility standard, and decide whether to move to dismiss again or to answer. If the plaintiff fails to amend within the deadline, the court will typically enter a final dismissal with prejudice.