FRCP Rule 4: Summons, Service Methods, and 90-Day Deadline

Rule 4 of the Federal Rules of Civil Procedure sets the requirements for issuing a summons and serving it, along with the complaint, on a defendant in a federal civil case. Without valid service under Rule 4, a federal court has no power to issue binding orders against the defendant, and the case cannot move forward.¹ Once a defendant is properly served, the standard clock to respond to the complaint is 21 days.²

What the Summons Must Contain

A valid summons identifies the court, names every party, and gives the name and address of the plaintiff’s attorney (or the plaintiff’s own address if self-represented). It tells the defendant how long they have to answer and warns that failing to respond will result in a default judgment. The clerk of court must sign it and stamp it with the court’s official seal.¹

Most plaintiffs use Form AO 440, the official federal summons template, to make sure every required element is present.³ The plaintiff presents it to the clerk for signature and seal, and issues a separate summons for each defendant. If a summons contains a minor error, the court has discretion to allow an amendment rather than requiring a fresh start.¹

Who Can Serve the Papers

The plaintiff is responsible for getting the summons and complaint delivered but cannot personally hand them to the defendant. Service must be carried out by someone at least 18 years old who is not a party to the case.¹ The neutral-server requirement exists to keep the delivery clean and avoid confrontation between the people directly in the dispute.

Plaintiffs commonly hire private process servers. The court can also order a U.S. Marshal to handle service, and must do so when the plaintiff is proceeding in forma pauperis or filing as a seaman. A plaintiff can also ask the court to appoint a specific person to serve the papers when safety concerns or other circumstances make that necessary.¹

Serving an Individual

Rule 4(e) gives three methods for serving an individual inside the United States. The most direct is handing the summons and complaint to the defendant. If the defendant can’t be found for a personal handoff, the server can leave copies at the defendant’s home with someone of suitable age and discretion who lives there — a spouse or adult roommate qualifies, a visiting friend does not. The third option is delivering the papers to an agent the defendant has formally authorized to accept legal documents.¹

Rule 4(e)(1) adds a fourth path: the plaintiff can use any service method allowed under the law of the state where the federal court sits or where service is actually made. Some states permit service by posting on the door or by publication in a newspaper after diligent efforts to locate the defendant have failed. That state-law option provides tools when the three federal methods aren’t workable.¹

Minors and Incompetent Persons

Different rules apply when the defendant is a minor or someone the court considers legally incompetent. In those cases, the plaintiff must follow the service rules of the state where service is made rather than the standard federal methods. State rules commonly require service on a parent, guardian, or other legal representative. If the person is outside the United States, international service methods apply instead.¹

Serving a Business

Under Rule 4(h), service on a corporation, partnership, or unincorporated association goes to an officer, a managing or general agent, or another agent the business has authorized to accept legal documents. Most businesses designate a registered agent for exactly this purpose so lawsuits reach the right people instead of getting lost in a mailroom.¹

When service goes through an agent authorized by statute rather than by the company itself, the server may also need to mail a copy of the documents to the business if the authorizing statute requires it. As with individuals, a plaintiff can also use whatever service methods the relevant state law allows, giving flexibility when a company is hard to reach.¹

Serving a Government

Lawsuits against government bodies require extra steps, and the requirements differ between state and federal defendants.

State and Local Governments

To sue a state, city, county, or other state-created governmental body, the plaintiff either delivers the summons and complaint to the entity’s chief executive officer or uses the service method that state’s law prescribes for lawsuits against that type of government defendant.¹

The Federal Government

Suing the United States, a federal agency, or a federal officer in an official capacity requires serving multiple recipients. The plaintiff must deliver the summons and complaint to the U.S. Attorney (or a designated assistant or clerical employee) in the district where the case was filed, or send copies by certified or registered mail to that office’s civil-process clerk. The plaintiff must also send copies by certified or registered mail to the Attorney General in Washington, D.C.¹

When the case challenges an order from a federal agency or officer who isn’t already a party, the plaintiff must also mail copies to that agency or officer by certified or registered mail. Suing a federal officer or employee in an official capacity requires serving the United States as described above and separately mailing copies to the individual. If the plaintiff serves either the U.S. Attorney or the Attorney General but misses another required recipient, the court must give a reasonable chance to fix the error rather than dismissing the case.¹

Serving a Defendant in a Foreign Country

When a defendant is outside the United States, Rule 4(f) provides tiered options. The preferred path is an internationally agreed mechanism reasonably designed to give actual notice, such as the procedures under the Hague Convention on the Service Abroad of Judicial and Extrajudicial Documents.¹

When no international agreement applies, alternatives include letters rogatory (formal requests from one country’s court to another for assistance with service), personal delivery to the individual in the foreign country, or any form of mail requiring a signed receipt, so long as the foreign country’s law doesn’t prohibit it.⁴ As a final backstop, the court can authorize any method not prohibited by international agreement when nothing else works.

Waiving Formal Service

Rule 4(d) offers a cooperative alternative. Instead of paying for formal service, the plaintiff can mail the defendant a written notice of the lawsuit along with a request to waive formal delivery. The package must include a copy of the complaint, two copies of the waiver form (typically Forms AO 398 and AO 399), and a prepaid means of returning the signed waiver, such as a stamped envelope.¹⁵

The defendant gets at least 30 days from when the request was sent to return the signed waiver, or 60 days if the defendant is abroad.¹ The incentive to cooperate: a defendant who returns the waiver has 60 days from the date the request was sent to answer the complaint rather than the 21 days that follow formal service, and 90 days if the defendant is outside the country.² And because international service is notoriously slow, that 60-day return window for defendants abroad matches the reality of getting documents across borders.

The penalty for refusing without good cause is equally real. If a defendant located in the United States doesn’t return the waiver without good cause, the court must order that defendant to pay the costs of formal service plus the reasonable expenses, including attorney’s fees, of any motion the plaintiff had to file to recover those costs. Waiving service doesn’t waive any objections to jurisdiction or venue, so a cooperating defendant gives up nothing substantive.¹

When Service Establishes Jurisdiction

Delivering the summons is only half the analysis. Rule 4(k) governs when that delivery actually gives the federal court power over the defendant. In most cases, service establishes personal jurisdiction if the defendant would be subject to the jurisdiction of a state court in the state where the federal court sits. If the defendant has no connection to that state, the case may need to be filed elsewhere.¹

Two exceptions extend the court’s reach. Under the “100-mile bulge” rule, a party brought in under Rule 14 (third-party claims) or Rule 19 (required parties) can be served anywhere within 100 miles of where the summons was issued, even across a state line. Separately, certain federal statutes authorize nationwide or worldwide service for specific claims. For claims arising under federal law where the defendant isn’t subject to jurisdiction in any single state’s courts, a federal court can exercise jurisdiction if doing so is consistent with the Constitution.¹

The 90-Day Deadline to Complete Service

A plaintiff has 90 days after filing the complaint to complete service. If that window closes without service, the court can dismiss the case without prejudice, meaning the plaintiff theoretically can refile but loses the original filing date and any fees already paid.¹ The danger comes when a statute of limitations has run in the meantime: a dismissal that technically permits refiling becomes a permanent loss if the limitations period expired while the original case was pending.

If the plaintiff shows good cause for missing the deadline, the court must grant more time. Recognized situations include the defendant actively evading service, a waiver request that failed, a marshal who hasn’t completed service in an in forma pauperis case, and a defendant who is genuinely hard to locate despite real effort. Courts also have discretion to extend the deadline without good cause when circumstances warrant it, though that generosity isn’t something to rely on.¹

Filing Proof of Service

After delivery, the person who carried out service must file a proof of service with the court. This is an affidavit — a signed, sworn statement — describing how, when, and where the papers were delivered and confirming the server met the eligibility requirements. When a U.S. Marshal handled service, the marshal’s official return substitutes for the affidavit.¹

Most federal courts accept the affidavit as a PDF through their electronic filing systems. One safety net: even if the proof of service is never filed or contains a defect, the service itself remains valid, and the court can allow the proof to be corrected or filed late without undoing what happened. Still, the proof is the court’s official record of jurisdiction over the defendant, so filing it promptly avoids disputes about whether service occurred.¹

1
Legal Information Institute. Federal Rules of Civil Procedure Rule 4
2
Legal Information Institute. Federal Rules of Civil Procedure Rule 12
3
United States Courts. Summons in a Civil Action
4
Office of the Law Revision Counsel. 28 US Code 1781 – Transmittal of Letter Rogatory or Request
5
United States District Court for the Middle District of Pennsylvania. Instructions for Completing AO 398 and AO 399