A deposition is sworn, out-of-court testimony that a witness gives under oath during the discovery phase of a lawsuit. A court reporter records every word, lawyers for each side ask questions, and the answers can be read or played back at trial. If you have been served with a notice of deposition or a subpoena to testify, you are being asked to answer questions under the same oath you would take on a witness stand, just in a conference room instead of a courtroom.
This guide explains what a deposition is, who is in the room, how the testimony gets used later, and how to prepare so that you come across as a careful, credible witness.
What is a deposition?
A deposition is part of discovery, the formal information-gathering process that happens before a civil case goes to trial. In federal court, depositions are governed by Rule 30 of the Federal Rules of Civil Procedure, and most states have a closely parallel rule. The purpose is to let each side learn what witnesses know, lock in their testimony, and assess how they will perform in front of a jury.
A few features define a deposition:
- It is under oath. You swear to tell the truth before questioning begins. Lying in a deposition is perjury, the same as lying on the stand.
- It is recorded. A court reporter creates a verbatim transcript. Many depositions are also video recorded.
- It happens outside the courtroom. There is no judge present. Depositions usually take place in a lawyer's conference room or, increasingly, over video conference.
- The questions are broad. Discovery allows questioning into anything reasonably likely to lead to admissible evidence, which is a wider net than what a judge would allow at trial.
Depositions can be taken from parties to the lawsuit (the plaintiff or defendant) or from non-party witnesses who happen to have relevant knowledge. A non-party is usually compelled to appear by subpoena.
Who is in the room
A deposition involves fewer people than most witnesses expect. Typically present are:
- The witness (also called the deponent), the person being questioned.
- The court reporter, a neutral officer who administers the oath and records the testimony.
- The questioning attorney, the lawyer for the side that noticed the deposition.
- Your attorney, if you are a party or have retained one. Your lawyer is there to protect your interests and make objections, not to answer for you.
- Other parties' attorneys, who may ask their own questions after the noticing lawyer finishes.
There is no jury and no judge. If a dispute arises that the lawyers cannot resolve, they note it on the record and, if necessary, raise it with the court later.
How a deposition is used at trial
The testimony you give in a deposition does not disappear when the session ends. Under Rule 32 of the Federal Rules of Civil Procedure, and equivalent state rules, deposition testimony can be used in several ways:
- Impeachment. If you testify at trial differently from how you testified in your deposition, the opposing lawyer can read your deposition answer aloud to show the jury that your story changed. This is the most common use, and it is why consistency matters.
- Substantive evidence. If a witness is unavailable at trial (for example, too ill to attend or beyond the court's subpoena power), the deposition transcript or video can be played in place of live testimony.
- Admissions by a party. Anything a party says in deposition can generally be used against that party for any purpose.
- Summary judgment. Lawyers cite deposition testimony in written motions to argue that there is, or is not, a genuine dispute of fact.
The practical takeaway is simple. Treat every answer as though a jury will eventually hear it, because it might.
How do I prepare for a deposition?
Preparation is the single biggest factor in how a deposition goes. If you have a lawyer, you will usually meet beforehand to review the likely topics and the documents involved. Beyond that, a few habits make a real difference:
- Review the key documents and your own prior statements. Refresh your memory on anything you wrote or signed that relates to the case. You do not need to memorize, but you should not be surprised by your own emails.
- Understand the topics, not a script. A deposition is not a test you can answer from a memorized answer key. The goal is to know the subject matter so you can answer truthfully and calmly.
- Get rest and plan logistics. Know the time, the location or the video link, and how long the session may run. Fatigue causes mistakes.
- Tell the truth, including when the truth helps the other side. Your job is to be accurate, not to win the case from the witness chair.
Dos and don'ts during the deposition
Once questioning begins, a handful of disciplines protect you:
- Answer only the question asked. Do not volunteer extra information. A narrow, responsive answer gives the questioning lawyer nothing to follow up on. A rambling answer opens new doors.
- Pause before you answer. The pause gives your lawyer time to object and gives you time to think. There is no prize for speed.
- It is fine to say you do not recall. If you genuinely do not remember, say so. Guessing creates testimony that can later be used to contradict you. "I do not recall" is a complete, truthful answer when it is true.
- Ask for clarification. If a question is confusing or compound, ask the lawyer to rephrase. Do not answer a question you do not understand.
- Do not guess or speculate. If you are asked to estimate, make clear that you are estimating. Never present a guess as a fact.
- Stay calm and polite. Some questioning is designed to provoke. An even temper reads as credibility on a transcript and on video.
- Do not argue with the lawyer. Your lawyer handles the legal fight. Your job is to answer questions.
Objections during a deposition
You will hear the lawyers say "objection" during the session. In a deposition, objections work differently than at trial because there is no judge to rule on them in real time.
When your attorney objects, the objection is noted on the record to preserve it for later. In most cases, you still have to answer the question after the objection is stated. The exception is when your lawyer instructs you not to answer, which is permitted only in narrow circumstances, such as protecting a privilege (for example, attorney-client communications). Listen carefully when an objection is made, because the wording is often a signal to slow down or to be careful with your answer.
The transcript and the errata sheet
After the deposition, the court reporter prepares a written transcript of everything that was said. You generally have the right to review it before it becomes final.
If you find an error, you correct it using an errata sheet, a form listing the page and line of each change, the correction, and the reason for it. Under Rule 30(e) of the Federal Rules of Civil Procedure, a party or witness usually has 30 days after being notified the transcript is available to review and sign it, though the exact window and procedure vary by jurisdiction.
Use the errata sheet carefully. It is meant to fix genuine transcription mistakes, such as a reporter writing "can" when you said "cannot." Substantive changes that contradict your sworn answers can be flagged at trial, where the opposing lawyer can point out both your original testimony and your later change. The cleanest deposition is one where the errata sheet is short because the testimony was careful the first time.