The difference between a motion to dismiss and a motion for summary judgment comes down to timing and what the court is allowed to look at. A motion to dismiss argues that the lawsuit shouldn’t exist in the first place because the complaint, taken on its own terms, doesn’t state a valid legal claim. A motion for summary judgment argues that after both sides have gathered evidence, there’s nothing left for a jury to decide. One is about the paperwork that started the case; the other is about the proof.
When Each Motion Gets Filed
A motion to dismiss is usually the defendant’s first move. Under the federal rules, a defendant can raise certain defenses by motion before filing a formal answer to the complaint.1Legal Information Institute. Federal Rules of Civil Procedure Rule 12 The lawsuit is brand new. No one has exchanged documents or taken depositions. The court is working only with the plaintiff’s version of events, and the defendant is essentially saying that even if every word of the complaint were true, the case still couldn’t go forward.
A motion for summary judgment comes much later. Either side can file one after discovery, where the parties exchange documents, answer written questions, and take depositions. The federal rules allow filing up to 30 days after discovery closes, unless a court order or local rule sets a different deadline.2Legal Information Institute. Federal Rules of Civil Procedure Rule 56 – Summary Judgment By this point the court has access to real evidence rather than just allegations. Plaintiffs and defendants can both file for summary judgment, while motions to dismiss are almost always a defense tool.
What a Motion to Dismiss Tests
A defendant can raise seven grounds under Rule 12: lack of subject-matter jurisdiction, lack of personal jurisdiction, improper venue, problems with how the paperwork was served, failure to state a claim, and failure to include a required party.1Legal Information Institute. Federal Rules of Civil Procedure Rule 12 Some of these go to the court’s basic authority to hear the case at all. The most common ground, though, is that the complaint fails to state a legally sufficient claim.
The Plausibility Standard
When the motion attacks the sufficiency of the complaint, the court assumes every factual allegation is true and then asks whether those facts, taken together, make it plausible that the defendant is liable. The Supreme Court has held that a complaint must contain enough factual detail to “state a claim to relief that is plausible on its face,” which means more than a bare possibility of wrongdoing but less than a probability.3Justia US Supreme Court. Ashcroft v. Iqbal, 556 U.S. 662 (2009)
Conclusory statements don’t count. If a complaint says “the defendant acted negligently” without any facts about what the defendant actually did, that bare legal conclusion gets no weight. The complaint needs concrete allegations: what happened, when, and how the defendant’s conduct caused harm. Clear that bar and the motion gets denied, and the case moves into discovery.
What Summary Judgment Tests
Summary judgment flips the analysis. Instead of assuming the complaint is true, the court looks at the evidence and asks whether any genuine factual dispute remains. The party filing the motion has to show two things: that no material facts are in dispute, and that the law entitles them to win.2Legal Information Institute. Federal Rules of Civil Procedure Rule 56 – Summary Judgment A material fact is one that could change the outcome. Disagreement over something that doesn’t affect who wins under the law isn’t enough.
Courts evaluate the evidence in the light most favorable to the party opposing the motion. If there are two reasonable ways to read a piece of evidence, the judge gives the benefit of the doubt to the side that didn’t file. This is where most summary judgment motions fail. Point to even one genuine factual dispute on a key issue and the case goes to trial. The judge isn’t weighing credibility or deciding whose story is more convincing. That’s the jury’s job. Summary judgment only works when the evidence is so one-sided that no reasonable jury could find the other way.
What Evidence the Court Considers
This is the sharpest practical difference between the two motions. On a motion to dismiss, the judge is largely confined to the complaint itself and any documents attached to it or referenced in it. No witness testimony. No contracts the plaintiff forgot to mention. No outside evidence the defendant wants to introduce. The entire analysis flows from what the plaintiff put on paper.
There’s a narrow exception. A court can take “judicial notice” of certain facts that aren’t reasonably debatable, like the contents of public records or facts verifiable from unquestionable sources.4Legal Information Institute. Federal Rules of Evidence Rule 201 – Judicial Notice of Adjudicative Facts A judge might take notice of a prior court filing or a government record without turning the motion into something else. The exception is narrow and doesn’t open the door to real factual investigation.
The Conversion Trap
Here’s a trap worth knowing. If either side submits materials outside the complaint on a motion to dismiss and the court doesn’t exclude them, the motion automatically converts into a motion for summary judgment, and both parties must then get a reasonable opportunity to present all relevant evidence.1Legal Information Institute. Federal Rules of Civil Procedure Rule 12 A defendant who attaches an affidavit to a motion to dismiss may inadvertently trigger the higher evidentiary standard, and the plaintiff suddenly gets to submit evidence too. Be deliberate about what you attach.
At summary judgment, the full evidentiary record is open. The court reviews deposition transcripts, affidavits, written answers to interrogatories, contracts, emails, and anything else in the case file.2Legal Information Institute. Federal Rules of Civil Procedure Rule 56 – Summary Judgment Affidavits and declarations have to be based on personal knowledge and set out facts that would be admissible at trial. Speculation and hearsay don’t get credit.
Partial Rulings in Multi-Claim Cases
Neither motion is all-or-nothing. A defendant can move to dismiss specific counts and leave others intact.5Legal Information Institute. Federal Rules of Civil Procedure Rule 41 – Dismissal of Actions If a plaintiff brings five claims and only three are legally viable, the court can toss the weak ones and let the rest proceed to discovery.
The same goes for summary judgment. A party can seek judgment on individual claims, defenses, or even specific parts of a claim.2Legal Information Institute. Federal Rules of Civil Procedure Rule 56 – Summary Judgment When the court grants partial summary judgment, it can also formally establish specific facts as undisputed for the rest of the case. That narrows what the jury has to decide and can shift settlement leverage substantially. A plaintiff who wins partial summary judgment on liability goes into trial only needing to prove damages.
What Happens After the Court Rules
If the Motion Is Granted
A granted motion to dismiss comes either “with prejudice” or “without prejudice.” Without prejudice means the plaintiff gets another chance to fix the complaint and refile. Courts often grant this when the defect is curable, like thin factual detail. With prejudice permanently bars the plaintiff from bringing those claims again.6Legal Information Institute. With Prejudice Dismissals based on jurisdictional problems, improper venue, or failure to join a necessary party are generally without prejudice, since those defects don’t reflect on the merits.
A granted motion for summary judgment is a final decision on the merits, carrying the same legal weight as a jury verdict after a full trial. The court has determined that the undisputed facts and the law dictate one outcome, so there’s nothing left for a jury to decide.
If the Motion Is Denied
When a motion to dismiss is denied, the defendant must file an answer within 14 days and the case moves into discovery.1Legal Information Institute. Federal Rules of Civil Procedure Rule 12 The denial isn’t the end of the defendant’s arguments. Many of the same legal theories can resurface at summary judgment, this time backed by actual evidence.
A denied motion for summary judgment just means the case goes to trial. The denial isn’t immediately appealable because it isn’t a final decision, and federal appellate courts generally have jurisdiction only over final decisions from district courts.7Office of the Law Revision Counsel. 28 USC 1291 – Final Decisions of District Courts The losing party can raise the issue on appeal after a final judgment, but trial comes first.
Appeals of Granted Motions
A dismissal with prejudice and a granted summary judgment motion both produce final orders the losing side can appeal. The appellate court reviews a motion to dismiss using the same standard as the trial court, accepting the complaint’s facts as true and deciding whether they state a plausible claim. For summary judgment, the appellate court independently reviews the evidence and draws all reasonable inferences in favor of the party that lost below.
Sanctions for Frivolous Motions
Filing either motion without a legitimate legal basis can trigger sanctions. Every motion in federal court carries an implicit certification that it’s supported by existing law and that the factual arguments have evidentiary support. When a court finds a motion was filed frivolously, it can order the filer to pay the opposing party’s reasonable attorney fees and litigation expenses. Non-monetary consequences range from formal reprimands to mandatory legal education. The court must give the offending party fair notice and a chance to respond before imposing any sanction.