Administering an oath in a deposition means a qualified, neutral officer puts the witness under penalty of perjury on the record before any questions are asked. Under the Federal Rules of Civil Procedure, that officer must be authorized to administer oaths, the swearing-in must be captured in the transcript, and the wording must be enough to impress on the witness the duty to testify truthfully. Skip a step, use the wrong officer, or lose the moment on a bad video feed, and the testimony that follows may not hold up as evidence.
Who Can Administer the Oath
Federal Rule of Civil Procedure 28(a) limits who may preside. A deposition must be taken before an officer authorized to administer oaths under federal law or the law of the place where the deposition occurs, or before a person the court specifically appoints for that purpose.1Office of the Law Revision Counsel. Federal Rule of Civil Procedure 28 – Persons Before Whom Depositions May Be Taken In practice this is usually a court reporter who also holds a notary commission, though a standalone notary or a court-appointed officer qualifies too.
The officer has to be neutral. Rule 28(c) disqualifies anyone who is a relative, employee, or attorney of any party, anyone related to or employed by a party’s attorney, and anyone with a financial interest in the case.1Office of the Law Revision Counsel. Federal Rule of Civil Procedure 28 – Persons Before Whom Depositions May Be Taken If a disqualified person administers the oath, the deposition is exposed to a motion to suppress.
What the Officer Says
Federal Rule of Evidence 603 requires an oath or affirmation to testify truthfully before any testimony begins, in a form calculated to impress that duty on the witness’s conscience.2Legal Information Institute. Federal Rules of Evidence Rule 603 – Oath or Affirmation to Testify Truthfully No specific words are prescribed. The familiar “Do you swear to tell the truth, the whole truth, and nothing but the truth?” is convention, not law. What matters is that the witness understands the obligation and the consequences of breaking it.
A witness with religious or personal objections to swearing may affirm instead. The affirmation replaces “swear” with “affirm” and drops any reference to a deity. It carries identical legal weight. The choice has no effect on admissibility.
What Has to Be on the Record
Rule 30(b)(5)(A) requires the officer to open the deposition with a recorded statement covering:
- The officer’s name and business address
- The date, time, and place of the deposition
- The deponent’s name
- The administration of the oath or affirmation
- The identity of everyone present
The point of that checklist is verification: anyone reading the transcript later must be able to confirm the oath was properly given by a qualified person.3Legal Information Institute. Federal Rules of Civil Procedure Rule 30 – Depositions by Oral Examination Missing any element, even something as basic as the date, opens the record to challenge.
Rule 30(c)(1) also requires the officer to personally record the testimony or supervise its recording in the officer’s presence.3Legal Information Institute. Federal Rules of Civil Procedure Rule 30 – Depositions by Oral Examination If the transcript does not reflect that the witness was sworn, the statements risk being treated as unsworn.
Remote Depositions
Remote depositions add an identity check. Before administering the oath, the officer asks the witness to hold a government-issued photo ID up to the camera to confirm who is on screen. The verification and the oath should both appear on the recording.
The officer needs to see and hear the witness the whole time the oath is being given. If the video or audio drops, the officer should stop and re-administer the oath once the connection is stable. A partial oath is no oath. Most states have moved past pandemic-era emergency orders and now recognize virtual attendance as sufficient presence for oath administration, though the specifics vary by jurisdiction. The core requirement is consistent: an uninterrupted audiovisual connection during the oath and throughout the testimony.
Swearing In an Interpreter
When the witness testifies through an interpreter, the interpreter takes a separate oath. Federal Rule of Evidence 604 requires every interpreter to be qualified and to swear or affirm they will make a true translation.4Legal Information Institute. Federal Rules of Evidence Rule 604 – Interpreter
Sequence matters. The officer swears in the interpreter first, then administers the witness’s oath through the interpreter, so the interpreter is already under oath when translating the witness’s own promise to tell the truth.5U.S. Department of State Foreign Affairs Manual. 7 FAM 920 – Taking Voluntary Depositions of Willing Witnesses At the end, the interpreter should sign an affidavit certifying they understood both languages and that the transcript accurately reflects the witness’s testimony as interpreted. That affidavit becomes part of the record if the translation is later disputed.
Depositions Taken Outside the United States
Rule 28(b) authorizes four ways to take a deposition abroad:
- Under an applicable treaty or convention, such as the Hague Evidence Convention
- Under a letter of request, sometimes called a letter rogatory, directed to a foreign tribunal
- Before a person authorized to administer oaths by federal law or by the law of the country where the deposition takes place
- Before a person the court commissions for that purpose, which by itself confers the power to administer any necessary oath
When the Hague Convention applies, parties are generally expected to use its procedures if an effective deposition can be obtained that way. Evidence obtained through a letter of request will not be excluded merely because it is not a verbatim transcript or because the testimony was not taken under oath in the American sense.1Office of the Law Revision Counsel. Federal Rule of Civil Procedure 28 – Persons Before Whom Depositions May Be Taken
U.S. consular officers stationed abroad can also preside. As of 2026, the State Department charges $1,283 to schedule a deposition appointment, $309 per hour for the officer’s attendance, and $415 for providing a seal and certification.6U.S. Embassy in Switzerland. Schedule of Fees for Consular Services The costs add up, which is why many practitioners rely on locally authorized officers or court-commissioned individuals when the situation allows.
Objecting to the Officer, or Agreeing on a Different One
If you think the officer is disqualified, raise it early. Under Rule 32(d)(2), any objection to the officer’s qualifications is waived unless made before the deposition begins or promptly after the disqualifying fact becomes known.7Legal Information Institute. Federal Rules of Civil Procedure Rule 32 – Using Depositions in Court Proceedings Holding the objection until trial is almost always too late.
The parties can also agree to change the rules. Rule 29 lets them stipulate that a deposition may be taken before any person, at any time or place, and in any manner they choose, and the resulting testimony has the same effect as any other deposition.8Legal Information Institute. Federal Rules of Civil Procedure Rule 29 – Stipulations About Discovery Procedure Even with that flexibility, most attorneys still prefer a credentialed officer.
If the Witness Refuses to Be Sworn
Flat refusals to take either an oath or an affirmation are rare, but they happen. The deposing party can seek a court order compelling the witness to cooperate, and under Rule 37(b)(1) disobedience of that order can be treated as contempt.9Legal Information Institute. Federal Rules of Civil Procedure Rule 37 – Failure to Make Disclosures or to Cooperate in Discovery Sanctions
Sanctions can go further. The court may treat disputed facts as established against the refusing party, bar that party from supporting or opposing designated claims or defenses, strike pleadings, stay the case until the order is obeyed, dismiss the action, or enter default judgment. It must also award the other side reasonable expenses and attorney’s fees caused by the refusal, unless the refusal was substantially justified.9Legal Information Institute. Federal Rules of Civil Procedure Rule 37 – Failure to Make Disclosures or to Cooperate in Discovery Sanctions The severity of that list is why most disputes end up being about the form of the oath rather than whether the witness will take one at all.
Certifying the Record After the Oath
When questioning ends, the officer prepares a signed certification verifying that the witness was duly sworn and that the transcript is a true record of the testimony. Rule 30(f)(1) requires this certification, and without it a court may refuse to accept the deposition on summary judgment or at trial.3Legal Information Institute. Federal Rules of Civil Procedure Rule 30 – Depositions by Oral Examination The certification page typically shows the officer’s name, commission number, and commission expiration date, confirming the officer had authority at the time the oath was administered.10U.S. Court of Federal Claims. US Court of Federal Claims Transcript Format Requirements
Why the Oath Carries Weight
Lying under oath at a deposition is perjury under federal law. 18 U.S.C. ยง 1621 punishes anyone who, while under oath, willfully states a material matter they do not believe to be true, with a fine, up to five years in prison, or both.11Office of the Law Revision Counsel. 18 USC 1621 – Perjury Generally The statute demands willfulness and materiality, so a genuine mistake or an answer on an irrelevant point is not criminal.
Federal perjury prosecutions arising from depositions are uncommon. The consequences that do bite tend to happen inside the case itself: courts have struck testimony, dismissed claims, and entered default judgments when a party is caught lying during discovery. The oath is what makes those remedies available. Get the swearing-in right, and the record is testimony. Get it wrong, and it may be nothing at all.