How Is a Subpoena Legally Served? Servers, Delivery, and Proof

A subpoena is legally served by having a non-party adult personally hand a copy to the named recipient, and, when the subpoena requires that person to appear, by tendering the statutory witness fee and mileage at the same moment. That is the rule under Federal Rule of Civil Procedure 45 and Federal Rule of Criminal Procedure 17, and it is the baseline nearly every state court builds on.¹²

Whether the subpoena orders testimony, document production, or both, the service mechanics are the same. What changes is what the recipient has to bring or do; how the papers reach them does not.

Who Can Serve It

The person doing the serving has to meet two conditions under federal rules: at least 18 years old, and not a party to the case. That excludes the plaintiff and the defendant from serving their own subpoenas. Everyone else is eligible.¹

In practice, most subpoenas are served by professional process servers or by a sheriff’s or marshal’s office. A friend, coworker, or relative who meets the age and non-party requirements can do it too. In federal criminal cases, the U.S. Marshals Service handles service for the government and for defendants represented by public defenders or court-appointed counsel under the Criminal Justice Act. When the Marshals are involved, the court must issue a certified order authorizing service and the payment of witness costs at government expense, and the Marshals’ office typically needs at least 10 working days of lead time.³

How Personal Delivery Works

Personal service means the server physically places a copy of the subpoena in the hands of the person named in it. Under Federal Rule 45 for civil cases and Rule 17 for criminal cases, that is the recognized method.¹²

The server needs to locate the right person and confirm identity before handing over the papers. Leaving the subpoena on a doorstep, sliding it under a door, or dropping it in the mail is not valid service in federal court. Neither is handing it to a spouse, an assistant, or a security guard.

Fees and Mileage at the Time of Delivery

If the subpoena requires the recipient to appear, the server has to tender witness fees and mileage when the papers change hands. Skip this and the subpoena can be unenforceable.

The federal attendance fee is $40 per day, set by statute.⁴ Mileage tracks the General Services Administration rate, which for 2026 is 72.5 cents per mile for a privately owned vehicle, and it covers travel to and from the place of attendance.⁵ The payment is a condition of valid service, not a courtesy.

One exception: when the federal government issues a subpoena in a criminal case, the server does not need to tender fees and mileage at the time of delivery.² For everyone else issuing a federal subpoena that compels attendance, fees travel with the papers.

When Something Other Than Hand-Delivery Is Allowed

Federal court subpoenas have to be personally delivered. Some state courts and some federal administrative agencies allow alternatives, and the specifics vary sharply from one jurisdiction to the next. If you are serving under state rules or under an agency’s authority, check that court’s or agency’s own service provisions before relying on anything other than personal delivery.

Substituted Service

After reasonable attempts at personal delivery have failed, some state courts allow the server to leave the subpoena with a competent adult at the recipient’s home or workplace, then mail a copy to the same address. The number of failed attempts required before substituted service becomes available depends on the jurisdiction.

Service by Mail

Some federal administrative agencies and some state courts permit service by certified or registered mail. The Department of Transportation’s Pipeline and Hazardous Materials Safety Administration, for example, allows service of a subpoena by certified or registered mail to a person’s last known address.⁶ Where mail service is allowed, the sender generally needs proof the recipient actually received the papers, such as a signed return receipt. Without that confirmation, service may be invalid.

Assuming mail or substituted service is valid when it isn’t will get the subpoena thrown out. Verify first.

Geographic Limits

A subpoena cannot force someone to travel across the country to appear. Federal Rule 45 limits compelled attendance at a trial, hearing, or deposition to within 100 miles of where the person lives, works, or regularly transacts business in person.¹ A party or a party’s officer can be reached slightly further: anywhere within the state where they reside, work, or do business, provided the travel would not impose substantial expense.

Document production follows the same 100-mile boundary. Records can only be required at a location within 100 miles of where the recipient lives, works, or does business. A subpoena that exceeds these limits is grounds a court must use to quash it.¹

Timing

Service has to give the recipient a reasonable amount of time to comply. Federal Rule 45 doesn’t set a single number; it just says a court must quash a subpoena that “fails to allow a reasonable time to comply,” leaving the determination to judicial discretion.¹ Courts look at how complex the request is, how many documents are involved, and whether the recipient needs to rearrange a schedule.

Many local court rules set specific minimums, commonly somewhere between 10 and 14 days before the compliance date. Document subpoenas often warrant even more lead time, because gathering and reviewing records takes longer than showing up to testify. A subpoena delivered two days before a hearing is practically begging to be quashed. Serve early.

Proof of Service

After delivering the subpoena, the server should complete a proof of service. The document records when and how service happened, and the name of the person served. The federal subpoena form has a section on its back page for this purpose, where the server fills in the details and signs a declaration under penalty of perjury.⁷

Under Federal Rule 45, proof of service does not automatically get filed with the court. It has to be proved “when necessary,” such as when the recipient doesn’t comply and the issuing party needs to show the court that valid service occurred.¹ Complete the form right after service anyway. You never know when you’ll need it, and reconstructing the details later is a poor substitute for a contemporaneous signed record.

What Defective Service Costs You

A subpoena that wasn’t properly served lacks teeth. Common defects include delivery by someone who is a party to the case, leaving the papers with a minor, failing to tender witness fees when attendance is required, and serving too late to allow reasonable compliance. Each of these gives the recipient grounds to file a motion to quash.

If service falls apart, you generally have to start over: locate the recipient, arrange for a qualifying adult to deliver the papers, tender the fees, and complete a new proof of service. Building that time into your schedule from the outset is cheaper than doing it under a deadline after a first attempt fails.

1
Legal Information Institute. Federal Rules of Civil Procedure Rule 45 – Subpoena
2
Office of the Law Revision Counsel. Federal Rules of Criminal Procedure Rule 17 – Subpoena
3
U.S. Marshals Service. Subpoenas
4
Office of the Law Revision Counsel. 28 U.S. Code 1821 – Per Diem and Mileage Generally
5
General Services Administration. GSA Bulletin FTR 26-02
6
eCFR. 49 CFR 105.50 – Serving a Subpoena
7
United States Courts. AO 88B – Subpoena to Produce Documents, Information, or Objects or to Permit Inspection of Premises in a Civil Action