FRCP in Plain English: The 12 Rules You Meet First

Short answer: The Federal Rules of Civil Procedure, often called the FRCP, are the court rules for civil lawsuits in United States federal district courts. The Supreme Court adopted them in 1937, they took effect in 1938, and the courts' own copy is dated December 1, 2025. A first federal case puts about a dozen of them in front of you quickly. They are Rules 4, 6, 12, 15, 24, 26, 30, 33, 34, 37, 41 and 45. They cover serving the case and counting deadlines. They also cover responding, changing the complaint, joining a case, and gathering evidence.

Written and checked on 12 October 2026. This is general information, not legal advice; check the cited statute or opinion before relying on it.

TL;DR

• The civil rules cover federal district courts only. Your state court has its own rules.
• Twelve rules cover the first moves. They run from service of the complaint to dismissal.
• Each rule has one number worth looking up. The table below lists it.
• Amendments take effect on December 1. Four of these twelve rules appear in pending proposals for 2027 or 2028. They are Rules 6, 26, 41 and 45. A proposal is not law.

Official text, as of 12 October 2026

This was read on 12 October 2026 in the Federal Rules of Civil Procedure Pamphlet, Dec. 1, 2025, the courts' own copy. Rule 1 says the rules "should be construed, administered, and employed by the court and the parties to secure the just, speedy, and inexpensive determination of every action and proceeding". The judiciary's rules page says the civil rules were last amended in 2025.

What changed in 2025 and 2026. The 2025 amendments changed Rules 16 and 26 and added a new Rule 16.1 on multidistrict litigation. Nothing new takes effect in 2026: the pending amendments page lists no Civil Rules for December 1, 2026. It lists Civil Rules 7.1, 26, 41, 45 and 81 for December 1, 2027, and Civil Rules 5, 5.2, 6 and 55 for December 1, 2028. It says dates can be delayed or withdrawn.

The twelve rules at a glance

The last column comes from the source line printed at the end of each rule in the official pamphlet. That line is the way to find a rule's last amendment.

What the Federal Rules of Civil Procedure are

The judiciary says the civil rules "govern civil proceedings in the United States district courts." The Supreme Court adopted them by order on December 20, 1937, sent them to Congress on January 3, 1938, and they took effect September 16, 1938. Appeals courts, bankruptcy courts and criminal cases use other rule sets. State courts use their own. Our guide to federal versus state law explains which system covers a dispute, and our guide to the types of primary law shows where court rules fit.

Congress and the courts change the rules on a calendar. For why that matters to anyone who cites a rule, see amendment history and point-in-time law.

A federal case in twelve rules

1. The plaintiff, the side that starts the case, files a complaint. Rule 4 governs serving it.
2. Rule 6 counts the days for every deadline that follows.
3. The defendant, the side being sued, responds under Rule 12.
4. Rule 15 lets either side change its papers.
5. Rule 24 lets an outsider ask to join.
6. Rule 26 sets what each side must share, and when.
7. Rules 30, 33, 34 and 45 collect evidence by questioning witnesses, written questions, document requests and subpoenas.
8. Rule 37 sets the consequences for falling short.
9. Rule 41 covers ending the case without a judgment.

The twelve rules

Rule 4: Summons and service

FRCP 4 says how a defendant must be formally told about a lawsuit. A summons is the court's notice to the defendant. It must be served with the complaint, and any adult who is not a party may serve it. Rule 4(m) sets 90 days after filing. If the defendant is not served in that time, the court "must dismiss the action without prejudice" against that defendant or order service within a set time. Good cause extends it. Foreign service under Rule 4(f), 4(h)(2) and 4(j)(1) is carved out. A defendant who waives service gets 60 days from the request, under Rule 4(d)(3). What goes wrong: treating a waiver request as a formal summons. Ask counsel which one arrived.

Rule 6: Counting time

FRCP 6 tells you how to count days. Rule 6(a)(1) says to "exclude the day of the event that triggers the period," then "count every day, including intermediate Saturdays, Sundays, and legal holidays." Include the last day. If it falls on a weekend or legal holiday, the period runs to the end of the next day that is not one.

Here is an illustration, not a deadline for any real case. Say a complaint is served Monday, September 21, 2026, starting a 21-day period. Day 21 is Monday, October 12, 2026. That is Columbus Day, which 5 U.S.C. § 6103(a) places on the second Monday in October, and Rule 6(a)(6)(A) lists it as a legal holiday. So the period runs to the end of Tuesday, October 13. Service on Saturday, October 3 puts day 21 on Saturday, October 24, so the period runs to Monday, October 26.

The August 2026 draft for December 1, 2028 changes only Rule 6(d), to match a renumbering in Rule 5. It is a proposal. Ask counsel to confirm the date and any court order.

Rule 12: Defenses and the motion to dismiss

FRCP 12 sets the time to respond to a complaint and lists the defenses a defendant can raise. Under Rule 12(a)(1)(A), a defendant must answer within 21 days after being served. If it timely waived service, the time is 60 days after the waiver request was sent, or 90 days if sent outside any judicial district of the United States. Rule 12(b) lists seven defenses, from lack of subject-matter jurisdiction to failure to join a party under Rule 19. If a defendant files a Rule 12 motion and the court denies it, Rule 12(a)(4) generally gives 14 days after notice of the ruling to answer, unless the court sets a different time. What goes wrong: some defenses, such as improper venue, are waived if left out of the first motion. Ask counsel what to include.

Rule 15: Amending the complaint or answer

FRCP 15 says when a side may change its filed papers. A party may amend once "as a matter of course" within 21 days after serving it. If a response is required, the window is 21 days after the response or after a Rule 12(b), (e) or (f) motion, whichever is earlier. After that, a party needs the other side's written consent or the court's leave. The text says: "The court should freely give leave when justice so requires." What goes wrong: letting the free window close without noticing. Ask counsel when it started and whether a response or motion changed the date.

Rule 24: Intervention

FRCP 24 lets an outsider join a case. Intervention means a nonparty asks to become a party. On timely motion, the court "must permit" two kinds of people to intervene. One has an unconditional right by federal statute. The other claims an interest in the property or transaction at issue that the result may harm. The exception is an interest that existing parties adequately represent. Rule 24(b) adds permission the court may give. The motion must come with a pleading stating the claim or defense. What goes wrong: waiting too long, because the motion must be timely. Ask counsel whether your interest is already represented.

Rule 26: Disclosures and the scope of discovery

FRCP 26 sets what each side hands over without being asked, and how far discovery can reach. Discovery is the stage where each side collects information. Initial disclosures are due at or within 14 days after the parties' planning meeting, unless a stipulation or order sets another time. Other requests must be relevant to a claim or defense and proportional to the needs of the case. A December 1, 2025 change added privilege timing to the discovery plan. A change is proposed for December 1, 2027. Our full guide is FRCP Rule 26 explained.

Rule 30: Depositions by oral examination

FRCP 30 lets a party question a witness in person, out of court. That is a deposition: oral questions, answered under oath and recorded. Rule 30(d)(1) says that unless stipulated or ordered, a deposition is "limited to one day of 7 hours." Absent a stipulation, Rule 30(a)(2)(A)(i) requires the court's permission for more than 10 depositions by the plaintiffs. The same limit applies to the defendants and to the third-party defendants. A nonparty's attendance is compelled by subpoena under Rule 45. What goes wrong: treating 7 hours as absolute. The court must allow more time if needed to fairly examine the witness. Ask counsel whether the sides stipulated to a different limit.

Rule 33: Interrogatories

FRCP 33 lets one party send another written questions to answer under oath. Rule 33(a)(1) allows "no more than 25 written interrogatories, including all discrete subparts," unless stipulated or ordered. Answers and objections are due within 30 days after service under Rule 33(b)(2). A company answers through an officer or agent, who must furnish the information available to the company. Objections must be stated with specificity. What goes wrong: counting 25 questions when discrete subparts count too. Ask counsel how a question with parts will be counted.

Rule 34: Producing documents, data and things

FRCP 34 is the rule behind most document requests. A party may serve on any other party a request to produce what it holds or controls. That covers documents, electronically stored information and physical things. Electronically stored information means data kept in digital form, such as email. The response is due in writing within 30 days after service under Rule 34(b)(2)(A). An objection must say whether any responsive material is being withheld because of it. What goes wrong: sending a Rule 34 demand to a nonparty. Rule 34(c) says a nonparty is reached under Rule 45. Ask counsel which rule a letter really invokes.

Rule 37: Failure to disclose or cooperate; sanctions

FRCP 37 covers what happens when a party does not follow the discovery rules. Sanctions are penalties the court can impose. One part that matters to businesses is Rule 37(e), about electronic data that should have been kept for litigation and is lost because a party failed to take reasonable steps, and cannot be replaced. If another party is hurt, the court may order measures "no greater than necessary to cure the prejudice." Harsher steps need a finding of "intent to deprive." Only then may the court presume the data was unfavorable and tell the jury so. Only then may it dismiss the case or enter a default judgment. What goes wrong: treating a records hold as optional. Ask counsel when the duty to keep records began.

Rule 41: Dismissal of actions

FRCP 41 covers ending a case without a trial. Under Rule 41(a)(1)(A), a plaintiff may dismiss without a court order, subject to a few other rules and federal statutes. One way is a notice filed before the opposing party serves an answer or a motion for summary judgment. The other is a stipulation signed by all parties who have appeared. Rule 41(a)(1)(B) says that dismissal is without prejudice unless the notice says otherwise. If the plaintiff already dismissed a federal or state case on the same claim, a notice operates as an adjudication on the merits. An August 2025 draft would allow dismissing single claims, and is listed for December 1, 2027. It is not law. Ask counsel what the notice should say.

Rule 45: Subpoenas

FRCP 45 is how a nonparty is compelled to testify or produce records. A subpoena is a court-issued order to do so. Under Rule 45(c)(1), it may command attendance at a trial, hearing or deposition within 100 miles of where the person lives, works or regularly does business in person. A state-wide option exists only if the person is a party or a party's officer, or is commanded to attend a trial and would not incur substantial expense. A person told to produce records may object in writing before the earlier of the compliance date or 14 days after service. A change to Rule 45(b) and (c) is proposed for December 1, 2027. Ask counsel whether your company is a party or a nonparty here.

Rules with the same number in other rule sets

Rule numbers repeat across rule sets. The Federal Rules of Criminal Procedure have a Rule 24 on trial jurors and a Rule 33 on new trials. The Federal Rules of Appellate Procedure have a Rule 24 on proceeding in forma pauperis, meaning without paying court fees, and a Rule 33 on appeal conferences. This guide covers the civil rules only. If someone says "Rule 24," ask which set they mean.

What sits on top of the rules

Each district court has local rules. Judges issue their own standing orders, and each case gets a scheduling order. These can change timing within what the rules allow. The rules themselves say so in places. Rules 30 and 33 both say "unless otherwise stipulated or ordered by the court," and Rule 26(a)(1)(C) allows a different time "by stipulation or court order." Read the national rule first. Then read the orders in your own case.

What goes wrong

• Counting business days only. Rule 6 says to count every day.
• Treating 21 days as the deadline when service was waived. It may be 60 or 90. Ask: was service waived, and did an order set a date?
• Believing a Rule 12 motion stops everything. Rule 12(a)(4) resets the time to answer. Ask counsel how.
• Assuming 25 interrogatories means 25 questions. Discrete subparts count.
• Treating a records hold as optional. Rule 37(e) turns on information that should have been kept.
• Reading a rule number without the rule set. Civil, criminal and appellate rules reuse numbers.
• Using a pre-2025 copy. Check the date on the pamphlet cover.

How to look up a rule

Open the courts' current pamphlet and check the cover date. Find the rule and read the source line at the end for its last amendment. Then read the committee note, which explains what the drafters meant, and your court's local rules page. For the Rule 26 deep dive, see FRCP Rule 26 explained. For the state side, see our guide to state court rules, and for how developers read the same rules, see the federal rules of procedure API guide. The wider map is in US Law Data: The Complete Guide.

FAQ

What are the Federal Rules of Civil Procedure?

They are the court rules for civil lawsuits in United States federal district courts. The Supreme Court adopted them in 1937, they took effect in 1938, and they were last amended in 2025. They do not cover criminal cases or state courts.

Do the Federal Rules of Civil Procedure apply in state court?

No. Each state has its own rules, and many are modeled on the federal ones. A state rule with the same number can say something different. Our state court rules guide explains how to find them.

What is FRCP Rule 12?

It is the rule on how and when a defendant responds to a complaint. A defendant generally has 21 days after service to answer. Rule 12 also lists seven defenses a defendant can raise, including a motion to dismiss for failure to state a claim.

How many interrogatories can you serve under Rule 33?

Up to 25, including all discrete subparts, unless the parties stipulate or the court orders otherwise. Interrogatories are written questions. The answers are given under oath. The answers are due within 30 days after service.

What is the difference between Rule 34 and Rule 45?

Rule 34 requests go to parties in the case. Rule 45 subpoenas reach nonparties and can also command testimony. Rule 34(c) itself points to Rule 45 for nonparties.

When did the Federal Rules of Civil Procedure last change?

An amendment took effect December 1, 2025. More are proposed for December 1, 2027 and December 1, 2028. Proposals are not law, and dates can slip.

Where can I read the official rules?

The judiciary posts the current pamphlet on uscourts.gov, with the date on its cover. Cornell's Legal Information Institute shows the same rules with committee notes, but it is an unofficial copy. Check the pamphlet date either way.

For the US statutes, regulations and court rules these laws sit in, see the US primary law API.

Priyansh Khodiyar

Co-Founder & CTO

Priyansh leads engineering and AI at Vaquill AI: the pipelines that pull statutes, regulations and court rules from every US jurisdiction's official publisher, and the REST API, MCP server and open dataset that serve them.