You can attach exhibits to a motion to dismiss, but whether the court will actually consider them depends entirely on which ground under Rule 12(b) you’re moving on. For a motion to dismiss for failure to state a claim under Rule 12(b)(6), only three narrow categories of documents are safe. For jurisdictional motions, affidavits and other evidence are routine and expected. Attach the wrong thing to a 12(b)(6) motion and the court can convert it into a summary judgment proceeding under Rule 12(d), which is usually the opposite of what a defendant wants.1Legal Information Institute. Federal Rules of Civil Procedure Rule 12 – Defenses and Objections: When and How Presented
Why the Ground of the Motion Changes Everything
Rule 12(d) restricts outside evidence only for motions under 12(b)(6) and 12(c). Every other Rule 12 ground, including challenges to subject-matter jurisdiction, personal jurisdiction, venue, process, service, and joinder, sits outside that restriction. So the first question before you attach anything is which subsection you’re filing under. A 12(b)(6) motion is confined to the pleadings; a 12(b)(1) or 12(b)(2) motion is not.1Legal Information Institute. Federal Rules of Civil Procedure Rule 12 – Defenses and Objections: When and How Presented
The reason for the difference lies in what each motion tests. A 12(b)(6) motion asks whether the plaintiff’s own allegations, taken as true, state a plausible legal claim. Bringing in outside documents would turn that test into a factual inquiry, which is what summary judgment is for. Jurisdictional motions, by contrast, test whether the court has authority to hear the case at all, and courts routinely resolve that question by looking at evidence.
Exhibits You Can Safely Attach to a 12(b)(6) Motion
Three categories of documents can be considered on a 12(b)(6) motion without triggering conversion. Each one exists because the document is already functionally part of the pleadings.
Documents the Complaint References
If the complaint quotes from or specifically references a document, you can attach it. The plaintiff put the document at issue by relying on it. The clearest example is a contract in a breach-of-contract suit: when the plaintiff describes the agreement’s terms, the defendant can attach the actual contract so the court sees what it says rather than the plaintiff’s characterization of it.
Documents Integral to the Claim
Even without an explicit reference, courts will consider a document if the plaintiff’s claims fundamentally depend on it. This is the “incorporation by reference” doctrine, and it has two elements: the document must be central to the claim, and its authenticity must not be disputed.2The University of Chicago Law Review. The Exception to Rule 12(d) – Incorporation by Reference of Matters Outside the Pleadings A loan agreement in a lending dispute or a deed in a property dispute qualifies. Tangential relevance does not. The document has to be at the heart of the claim.
Matters of Public Record
Courts can take judicial notice of public records without converting the motion. Under Federal Rule of Evidence 201, a court may notice a fact not subject to reasonable dispute because it can be accurately determined from sources whose accuracy cannot reasonably be questioned.3Legal Information Institute. Federal Rules of Evidence Rule 201 – Judicial Notice of Adjudicative Facts Prior court judgments, official government filings, property records, and SEC filings all fit. If a suit is barred by an earlier judgment, a certified copy of that judgment is fair game.
One important limit: judicial notice covers the existence and content of the document, not the truth of every assertion inside it. A court may notice that a government report exists and says what it says without accepting each factual claim in it as proven.
What Jurisdictional Motions Allow Instead
If you’re moving under 12(b)(1) or 12(b)(2), outside evidence is expected rather than restricted. A subject-matter jurisdiction motion can be decided on the complaint alone, on the complaint plus undisputed facts in the record, or on the complaint combined with the court’s own resolution of disputed facts. So a defendant challenging diversity jurisdiction can submit declarations and supporting records showing that the parties are actually citizens of the same state, contrary to the complaint’s allegation.
Personal jurisdiction challenges almost always involve outside evidence. A business challenging jurisdiction typically files a declaration from a company officer explaining that it has no offices, employees, or regular operations in the forum state. Once the defendant produces that evidence, the burden shifts to the plaintiff to come forward with evidence that jurisdiction exists. The back-and-forth happens through competing affidavits, not the complaint alone.
The Conversion Trap Under Rule 12(d)
If you attach documents to a 12(b)(6) motion that don’t fit the three exceptions, Rule 12(d) gives the court two choices.1Legal Information Institute. Federal Rules of Civil Procedure Rule 12 – Defenses and Objections: When and How Presented
The better outcome: the court ignores the extra materials and decides the motion on the pleadings alone. Many judges take this route when the improper exhibits aren’t central to the argument. The stray exhibit is effectively treated as if it were never filed.
The worse outcome: the court converts the entire motion into a motion for summary judgment under Rule 56.4Legal Information Institute. Federal Rules of Civil Procedure Rule 56 – Summary Judgment Both sides must then be given a reasonable opportunity to submit additional evidence, including depositions, interrogatory answers, and declarations.5Justia. Order Converting Motion to Dismiss into a Motion for Summary Judgment – Singh v Pheiffer The test shifts from plausibility of the complaint to whether any genuine dispute of material fact exists.
Conversion is a serious problem for a defendant who filed early to avoid discovery. A motion to dismiss is meant to be a fast, inexpensive challenge before discovery begins. Summary judgment typically requires discovery to be substantially complete. Getting converted can force months of depositions and document production, which is what the motion was supposed to head off.
Redact Before You File
Before attaching any exhibit, check it against Federal Rule of Civil Procedure 5.2.6Legal Information Institute. Federal Rules of Civil Procedure Rule 5.2 – Privacy Protection For Filings Made with the Court Every filing, including exhibits, must limit certain identifiers:
- Social Security and taxpayer ID numbers to the last four digits
- Birth dates to the year only
- Names of minors to initials
- Financial account numbers to the last four digits
Redaction is entirely on the filing party. The clerk’s office does not review documents for compliance, and an unredacted exhibit becomes part of the public record the moment it’s filed. If the court needs the complete information, file an unredacted version under seal alongside the redacted public version.6Legal Information Institute. Federal Rules of Civil Procedure Rule 5.2 – Privacy Protection For Filings Made with the Court
How to Format and Label the Exhibits
Label each exhibit sequentially, either with letters (Exhibit A, Exhibit B) or numbers. Inside the motion, reference each exhibit where it supports your argument, and point the court to the specific page. A sentence like “The agreement’s termination clause contradicts the plaintiff’s theory (Exhibit A at 4)” is doing work; a stack of documents with no cross-references is not.
Include an exhibit list or index immediately after the motion and before the first exhibit, showing each exhibit’s label, a brief description, and the page number where it begins. For electronic filing, produce a single text-searchable PDF containing the motion followed by the exhibits in order, with bookmarks for each one. Most federal courts strongly encourage bookmarking and some local rules require it. Scanned documents are generally prohibited unless no electronic original exists. For physical filings, use tabbed dividers that match the exhibit labels.
Check the local rules of the court and the individual judge before filing. Districts and judges often have specific preferences on file size, whether to file exhibits as separate attachments or as a single combined document, and other formatting details.
Filing Timing and Service
A motion to dismiss must be filed before the defendant answers the complaint.1Legal Information Institute. Federal Rules of Civil Procedure Rule 12 – Defenses and Objections: When and How Presented The standard federal deadline is 21 days after service of the summons and complaint, extended to 60 days if the defendant waived formal service (90 days if the waiver request was sent outside the United States), or 60 days after service on the United States Attorney for federal government defendants. Filing a Rule 12 motion pauses the answer deadline; if the court denies the motion, the defendant has 14 days from the ruling to answer. State courts have their own timelines, some shorter.
After filing, you must serve a complete copy of the motion and every exhibit on every other party. In most federal cases, filing through the court’s electronic system automatically serves all registered parties. When electronic service isn’t available, service can be made by mail, in-person delivery, or other methods the rules permit, and you need to file a certificate of service identifying when, how, and to whom the documents were sent.7Legal Information Institute. Federal Rules of Civil Procedure Rule 5 – Serving and Filing Pleadings and Other Papers No certificate is required when electronic filing accomplishes service, though many practitioners include one anyway, and some local rules still call for it.