A lawsuit doesn’t actually start running against a defendant the moment a complaint is filed. It starts when the defendant is handed, or otherwise legally receives, a copy of the summons and complaint through a method the rules recognize. That step is called service of process, and it is a constitutional requirement grounded in the Fifth and Fourteenth Amendments. Until it is done correctly, no court has authority over the defendant, and any judgment entered without it can be set aside later. Everything that follows in a civil case, from response deadlines to default, is built on the service of summons and complaint being completed properly first.
Who Can Deliver the Papers
Federal Rule of Civil Procedure 4(c)(2) sets a plain baseline: any person who is at least 18 and is not a party to the lawsuit can deliver the summons and complaint.1Legal Information Institute. Federal Rules of Civil Procedure Rule 4 – Summons Plaintiffs cannot serve their own papers. A neutral third party at the door removes any later argument about what was said or handed over.
A friend or relative who meets the age and non-party requirements can legally do it. In practice, most plaintiffs hire a professional process server or use the county sheriff. Professional servers typically charge between $35 and $150 per job depending on location, urgency, and how many attempts are needed. They keep detailed logs of each attempt, which matter when the affidavit of service is filed. Sheriff departments also serve civil papers for a statutory fee, usually in the $40 to $65 range plus mileage.
Licensing rules for process servers vary by state. Some require registration, bonding, and a written exam. Others leave regulation to individual counties, and a handful require liability insurance.
The 90-Day Deadline
Filing the complaint only starts the clock. Under Rule 4(m), the plaintiff has 90 days from the filing date to complete service on each defendant. Miss that window and the court can dismiss the case without prejudice or order service completed by a set date.1Legal Information Institute. Federal Rules of Civil Procedure Rule 4 – Summons
If the plaintiff can show good cause for the delay, the court must grant an extension. Courts have accepted reasons like a defendant actively hiding, a defendant who concealed a defect in an earlier attempt, or a situation where the statute of limitations would bar refiling. Even without good cause, judges have discretion to extend the deadline rather than dismiss. Counting on that discretion is not a strategy.
One boundary worth knowing: the 90-day deadline does not apply to service in a foreign country.1Legal Information Institute. Federal Rules of Civil Procedure Rule 4 – Summons
Personal Service
Handing the papers directly to the defendant is the strongest form of service. The server physically delivers the summons and complaint in person, usually confirming identity by asking the defendant to state their name or by using a photograph.2Legal Information Institute. Personal Service
Defendants sometimes refuse to accept the papers, or try to walk away. That does not defeat service. Once the server has correctly identified the defendant and offered the documents, the server can set them at the defendant’s feet or on a nearby surface. This is commonly called drop service, and it counts as valid personal service in most jurisdictions. The server notes the refusal in the affidavit and the case moves forward. Slamming the door after the papers have been offered does not undo what is already legally complete.
Gated communities can create practical obstacles. Several states have statutes requiring staffed guard stations to allow a process server reasonable access when the server shows identification and proof of authority. Where no such statute exists, the server may need to catch the defendant in a public area or ask the court for alternative service.
Substituted Service
When repeated attempts at personal delivery fail, Rule 4(e) allows the server to leave copies of the summons and complaint at the defendant’s home with someone of suitable age and discretion who lives there.3Legal Information Institute. Federal Rules of Civil Procedure Rule 4 – Summons – Section: (e) Serving an Individual Within a Judicial District of the United States A roommate or spouse easily qualifies. A young child does not.
The federal rule does not require a follow-up mailing, but many state rules do. Federal courts allow service under either the federal rules or the law of the state where the court sits, so the exact requirements depend on which path the plaintiff picks.3Legal Information Institute. Federal Rules of Civil Procedure Rule 4 – Summons – Section: (e) Serving an Individual Within a Judicial District of the United States Some state procedures also permit substituted service at the defendant’s workplace by leaving documents with a person in charge of the office.
Waiver of Service by Mail
Rule 4(d) offers a shortcut that benefits both sides. Instead of sending a process server, the plaintiff mails the defendant a formal request to waive service, along with a copy of the complaint and a prepaid return envelope. The defendant has at least 30 days from the date the request was sent to sign and return the waiver, or 60 days if the defendant is outside the United States.1Legal Information Institute. Federal Rules of Civil Procedure Rule 4 – Summons
The incentive to cooperate is built in. A defendant who signs the waiver gets 60 days from the date the request was sent to file an answer instead of the standard 21 days, which is extra time to prepare a defense. A domestic defendant who refuses without good cause gets stuck paying the plaintiff’s costs of arranging formal service, including reasonable attorney’s fees for any motion needed to collect those expenses.1Legal Information Institute. Federal Rules of Civil Procedure Rule 4 – Summons Signing a waiver does not give up any substantive defense; it only waives the formality of in-person delivery.
Serving a Business
Suing a corporation, LLC, or partnership means serving someone authorized to accept papers for the entity. Under Rule 4(h), a business can be served by delivering the summons and complaint to an officer, a managing or general agent, or any other agent authorized by law or appointment to receive service.4Legal Information Institute. Federal Rules of Civil Procedure Rule 4 – Summons – Section: (h) Serving a Corporation, Partnership, or Association
Every state requires registered businesses to designate a registered agent, sometimes called a statutory agent, specifically to accept service.5Legal Information Institute. Agent for Service of Process The agent can be a company officer, an attorney, or a third-party service. The registered agent’s name and address are usually available through the state’s secretary of state office. Handing papers to the receptionist at corporate headquarters generally does not count unless that person happens to be an authorized agent.
Service by Publication and Electronic Methods
When a defendant has genuinely vanished and no other method will reach them, a court may authorize service by publication as a last resort. The plaintiff first has to document due diligence: a real effort to locate the defendant through public records, contact with known associates, and other reasonable steps. Only when a judge is satisfied those efforts came up short will the court order publication.
The court typically directs the summons to be printed in a newspaper of general circulation near the defendant’s last known location. Most jurisdictions require the notice to run once a week for several consecutive weeks, commonly three or four. Because a newspaper notice is far less likely to actually reach anyone than a knock on the door, judges scrutinize the prior search closely.
A growing number of courts have permitted service through email or social media when traditional methods and even publication seem pointless. The constitutional standard remains the one the Supreme Court set in Mullane v. Central Hanover Bank & Trust Co.: the method must be reasonably calculated to actually notify the defendant. Plaintiffs typically have to show the account belongs to the defendant and is actively used, and courts are more likely to approve electronic service as a supplement to another method rather than the sole means.
International Service
Serving a defendant in another country adds layers and often takes months. The method depends largely on whether the foreign country is a party to the Hague Service Convention, a treaty that routes service requests through designated government offices called Central Authorities.6U.S. Department of State. Service of Process
For non-member countries, options include international registered mail with return receipt requested (unless the foreign country’s laws prohibit it), hiring a local attorney or process server in the foreign country, or sending a formal request called letters rogatory from the U.S. court to the foreign court. The State Department warns that letters rogatory can take a year or more, so they are typically a last resort.6U.S. Department of State. Service of Process
Proof of Service and the Response Clock
After delivery, the server files proof of service with the court. Unless the server is a U.S. Marshal, proof takes the form of the server’s own sworn affidavit describing when, where, how, and to whom the documents were delivered.7Legal Information Institute. Federal Rules of Civil Procedure Rule 4 – Summons – Section: (l) Proving Service
Filing that document starts the clock on the defendant’s response. In federal court, the defendant has 21 days from the date of service to file an answer, or 60 days if they signed a waiver.8Legal Information Institute. Federal Rules of Civil Procedure Rule 12 – Defenses and Objections – Section: (a) Time to Serve a Responsive Pleading If the affidavit contains minor errors like a wrong date or a misspelled name, the court can permit the server to amend it; paperwork mistakes do not invalidate service that was otherwise properly completed.7Legal Information Institute. Federal Rules of Civil Procedure Rule 4 – Summons – Section: (l) Proving Service
Challenging Service That Was Done Wrong
A defendant who believes service was improper can raise that defense under Rule 12(b)(5) by filing a motion before answering the complaint.9Legal Information Institute. Federal Rules of Civil Procedure Rule 12 – Defenses and Objections Common grounds include the wrong person being served, service at an address where the defendant no longer lives, or a method the rules do not authorize.
Timing is strict. A defendant who files an answer or another Rule 12 motion without raising insufficient service of process waives the defense permanently.9Legal Information Institute. Federal Rules of Civil Procedure Rule 12 – Defenses and Objections If the motion is granted, the court usually gives the plaintiff another chance to serve correctly rather than dismissing outright, though the plaintiff still has to act within the 90-day window or show good cause.
What Happens If a Defendant Ignores the Papers
Once service is properly completed and the response deadline passes with no filing, the plaintiff can ask the court clerk to enter a default, which is a formal finding that the defendant failed to defend the case.10United States Courts. Federal Rules of Civil Procedure – Rule 55 Default and Default Judgment After default is entered, the plaintiff moves for a default judgment, and the court can award damages and other relief without the defendant ever presenting a defense.
For claims involving a specific dollar amount, the clerk can enter judgment directly. For everything else, the plaintiff applies to the judge, who may hold a hearing to determine damages.10United States Courts. Federal Rules of Civil Procedure – Rule 55 Default and Default Judgment A court can set aside a default judgment for good cause, but getting out from under one is far harder than simply responding on time. Ignoring the summons because you hope the problem goes away is one of the most expensive mistakes a defendant can make.