What Is a Legal Brief: Types, Formatting, and Deadlines

A legal brief is a written argument an attorney files with a court to explain why the judge should rule in their client’s favor. It takes the facts of a case, matches them to the governing law, and asks the court for a specific outcome. Despite the name, briefs are rarely short: a principal brief in a federal appeal can run up to 13,000 words, and courts enforce the formatting and filing rules strictly.

What a Brief Does

Every brief does the same basic work. The attorney lays out what happened, identifies the legal rules that apply, and explains why those rules point to a particular result. The arguments are supported by citations to statutes, regulations, and prior court decisions, along with references to the record of the case.

Briefs show up in both trial and appellate courts, but they play different roles. In a trial court, a brief usually accompanies a specific request, such as a motion to dismiss or a motion for summary judgment. In an appellate court, the brief is the main event. Appellate judges read the written record and the parties’ briefs before any oral argument, and some appeals are decided on the briefs alone with no argument at all. A clear brief gives the judge a path through the issues; a disorganized one can bury strong points where no one finds them.

Common Types of Legal Briefs

Appellate Briefs

An appellate brief is filed when a party challenges a lower court’s ruling. The appellant (the party who lost below) files the opening brief, arguing that the trial court made a legal error that changed the outcome. The appellee then files a response defending the ruling. Under the federal rules, the appellant’s brief must include a statement of the issues, a statement of the facts with record citations, and an argument section that pairs each legal contention with the applicable standard of review. The appellee’s brief follows the same structure but does not need to repeat the factual statement, jurisdictional statement, or standard of review unless the appellee disagrees with the appellant’s version.1Cornell Law School. Federal Rules of Appellate Procedure Rule 28 – Briefs

Reply Briefs

After the appellee responds, the appellant can file a reply brief. A reply is limited to responding to the arguments the appellee raised. Courts routinely refuse to consider new arguments that appear for the first time in a reply. If a new issue genuinely needs to be raised, the right move is to ask the court for permission to file a supplemental brief.

Motion Briefs

Motion briefs support or oppose specific requests during a case at the trial level. Common examples include motions to dismiss, motions for summary judgment, and motions to exclude evidence. These briefs tend to be more focused than appellate briefs because they address one issue rather than the entire case. Supporting materials like affidavits and deposition excerpts often accompany the brief itself.

Amicus Curiae Briefs

An amicus curiae brief (Latin for “friend of the court”) comes from someone who isn’t a party to the case but has a stake in the outcome. Trade associations, civil rights organizations, and government agencies file these in cases with broad implications. In federal appellate courts, an amicus can file only with the court’s permission or with the consent of all parties.2Cornell Law School. Federal Rules of Appellate Procedure Rule 29 – Brief of an Amicus Curiae

What Goes Inside an Appellate Brief

Appellate briefs follow a standardized structure, and judges expect to find each piece of information in a specific place. Federal appellate briefs must include these sections, in this order:

  • Table of contents, listing every heading and subheading with page numbers.
  • Table of authorities, an alphabetized list of every case, statute, regulation, and other source cited, with the pages where each appears.
  • Statement of the issues, identifying the specific legal questions the court must decide.
  • Statement of the case, a factual and procedural narrative with citations to the trial court record.1Cornell Law School. Federal Rules of Appellate Procedure Rule 28 – Briefs
  • Summary of argument, a condensed version of the legal arguments, usually a page or two.
  • Argument, the main section, with each issue in its own subsection and the applicable standard of review stated for each.1Cornell Law School. Federal Rules of Appellate Procedure Rule 28 – Briefs
  • Conclusion, a short statement of the specific relief requested, such as reversal or remand.

Two certifications typically accompany the brief. A certificate of service proves the brief was delivered to the other parties and identifies the date and method of delivery. When the brief is filed through the court’s electronic filing system, no separate certificate is required because the system itself notifies registered parties; for any other method, a certificate must be filed with the brief or soon after.3Cornell Law School. Federal Rules of Civil Procedure Rule 5 – Serving and Filing Pleadings and Other Papers When a brief is subject to a word-count limit, a certificate of compliance states the exact word count and confirms the brief meets typeface and formatting requirements. Attorneys can rely on the count generated by their word-processing software.

Length and Formatting Limits

Under the Federal Rules of Appellate Procedure, a principal brief can be no longer than 30 pages, but most attorneys use the alternative word-count limit of 13,000 words. A reply brief is capped at 15 pages or 6,500 words. Items like the cover page, tables, and certificates don’t count toward the word limit.4Cornell Law School. Federal Rules of Appellate Procedure Rule 32 – Form of Briefs, Appendices, and Other Papers

Federal appellate briefs must be printed on 8½-by-11-inch paper with margins of at least one inch on all sides. The text must be double-spaced, though block quotations, headings, and footnotes can be single-spaced. The typeface can be either a proportionally spaced font with serifs at 14-point or larger, or a monospaced font limited to 10½ characters per inch. Case names must be italicized or underlined. The U.S. Supreme Court has its own, stricter formatting rules.5Cornell Law School. Supreme Court Rule 33 – Document Preparation State courts set their own requirements, which vary widely.

Filing Deadlines

In federal appellate courts, the appellant must serve and file the opening brief within 40 days after the record is filed. The appellee then has 30 days after receiving the appellant’s brief to file a response.6Cornell Law School. Federal Rules of Appellate Procedure Rule 31 – Serving and Filing Briefs

When computing these deadlines, the triggering day itself doesn’t count, but every subsequent day does, including weekends and holidays. If the last day falls on a Saturday, Sunday, or legal holiday, the deadline rolls to the next business day. If the clerk’s office is inaccessible on the last day due to weather or another emergency, the deadline extends to the next accessible business day.7Cornell Law School. Federal Rules of Appellate Procedure Rule 26 – Computing and Extending Time Most federal courts now require electronic filing through the CM/ECF system, with documents submitted as text-searchable PDFs. State court deadlines and filing methods vary, so check the local rules well ahead of any deadline.

Redaction and Privacy Rules

Because court filings often become public records, federal rules require redaction of certain sensitive information before a brief is filed. Under Federal Rule of Civil Procedure 5.2, filings must be redacted to show:

A filer who includes their own unredacted personal information without asking that the document be sealed waives these protections. An inadvertent failure to redact is treated as a fixable mistake, but the court can order the unredacted version sealed and require a redacted version for the public record.

Consequences of a Noncompliant Brief

Filing a brief that violates the rules carries real consequences. At the least severe end, the court may order the attorney to fix the problem and refile. At the more serious end, the court can strike the brief entirely, leaving the party without a written argument on the record.

Under Rule 11 of the Federal Rules of Civil Procedure, every filing carries an implicit certification that it has a legitimate legal and factual basis. An unsigned brief must be stricken unless the attorney corrects the omission promptly. If the court finds that a filing was submitted for an improper purpose or that its legal arguments have no reasonable basis, it can impose sanctions ranging from nonmonetary directives to payment of the opposing party’s attorney fees. In extreme cases, sanctions can include dismissal of a claim or preclusion of a defense.9Cornell Law School. Federal Rules of Civil Procedure Rule 11 – Signing Pleadings, Motions, and Other Papers Formatting violations are treated less harshly than substantive ones, but courts have little patience for attorneys who disregard length limits or margin requirements.

Filing a Brief Without a Lawyer

People who represent themselves (pro se litigants) are generally held to the same rules as attorneys, though many courts make practical accommodations. Several federal appellate courts use an informal briefing procedure for pro se cases, providing a simplified form that asks for the issues on appeal and the supporting facts and argument. Under these informal procedures, pro se filers aren’t required to cite legal cases, though they can attach a supporting memorandum if they choose. Length limits still apply, and handwritten briefs are typically capped at 30 pages. If you’re filing a brief without a lawyer, check the court’s local rules and any pro se guidance the clerk’s office provides before you start writing.