Yes, interrogatories are answered under oath. Federal Rule of Civil Procedure 33 requires every answer to be given separately and fully in writing under oath, and the responding party signs a written verification declaring under penalty of perjury that the answers are true.1Legal Information Institute. Federal Rules of Civil Procedure Rule 33 – Interrogatories to Parties That signed declaration carries the same legal weight as testimony given aloud in a courtroom, which is why a false interrogatory answer can support a perjury charge and almost always draws sanctions inside the case.
How the Written Oath Works
Depositions use a spoken oath administered by a court reporter. Interrogatories skip that step and rely on a written verification instead. At the end of your answers, you sign a statement declaring “under penalty of perjury that the foregoing is true and correct,” followed by the date and your signature. Federal law treats that signed declaration the same as a statement made under oath, as long as it uses the form set out by statute.2Office of the Law Revision Counsel. 28 USC 1746 Unsworn Declarations Under Penalty of Perjury
Rule 33 requires that the person providing the answers sign them personally.1Legal Information Institute. Federal Rules of Civil Procedure Rule 33 – Interrogatories to Parties Your attorney can help draft the responses, but the verification signature on the factual answers must be yours. The attorney signs any objections separately. That split matters: only the party is vouching for the truth of the facts. An unsigned or unverified set of answers is treated as no answer at all, and the opposing side can move to compel a proper response or ask for sanctions.
Who Signs When the Party Is a Business
A corporation, partnership, association, or government agency cannot sign for itself. Rule 33 allows any officer or agent of the organization to answer on its behalf.1Legal Information Institute. Federal Rules of Civil Procedure Rule 33 – Interrogatories to Parties The person who signs must provide all information available to the organization, not just what they personally happen to know. In practice, the designated officer or agent has to gather facts from across the company before verifying the answers, because the signature binds the entity to everything on the page.
What Happens If You Lie
Because interrogatory answers are sworn, a deliberate falsehood is perjury. Federal law punishes perjury with a fine and up to five years in prison.3Office of the Law Revision Counsel. 18 US Code 1621 – Perjury Generally Criminal prosecution over interrogatory answers is rare in practice, and it tends to happen only when the lie concerns a central fact and the dishonesty is provable beyond dispute.
Sanctions inside the civil case are the more common consequence. Under Rule 37, a judge who finds that a party gave false or evasive discovery responses can order that party to pay the other side’s attorney’s fees and expenses.4Legal Information Institute. Federal Rules of Civil Procedure Rule 37 – Failure to Make Disclosures or to Cooperate in Discovery Sanctions The rule treats an evasive or incomplete answer the same as a failure to respond at all.
When the dishonesty is serious or repeated, Rule 37(b) allows courts to escalate to sanctions that reshape the outcome of the case:
- Striking some or all of the dishonest party’s claims or defenses.
- Dismissing the dishonest party’s lawsuit entirely.
- Entering default judgment against the dishonest party without a trial.
- Informing the jury that the party failed to provide honest discovery responses, which can undercut that party’s credibility on every other issue.
Judges have broad discretion in choosing which combination to impose.4Legal Information Institute. Federal Rules of Civil Procedure Rule 37 – Failure to Make Disclosures or to Cooperate in Discovery Sanctions A single dishonest answer can unravel an otherwise strong case, because opposing counsel and the court view discovery integrity as a baseline that the violating party rarely recovers from.
Your Duty to Correct Earlier Answers
Signing your answers is not a one-time obligation. Under Rule 26(e), if you later learn that any of your answers were incomplete or incorrect in a material way, you must supplement or correct them in a timely manner.5Legal Information Institute. Federal Rules of Civil Procedure Rule 26 – Duty to Disclose General Provisions Governing Discovery Because there is no one following up with you in real time, the burden falls entirely on you to flag when something you swore to has changed.
The trial-day penalty for ignoring that duty is severe. Under Rule 37(c), if you fail to supplement and cannot show substantial justification or harmlessness, you are barred from using the undisclosed information or witness as evidence on a motion, at a hearing, or at trial.4Legal Information Institute. Federal Rules of Civil Procedure Rule 37 – Failure to Make Disclosures or to Cooperate in Discovery Sanctions The court can also order you to pay the other side’s expenses, inform the jury of the failure, or impose the harsher sanctions available elsewhere in the discovery rules. Evidence exclusion is often the punishment that hurts most: a key document or witness you never disclosed gets kept out at the moment you most need it.
When You Can Object Instead of Answering
Answering under oath does not mean answering every question without pushback. If an interrogatory is legally improper, your attorney can assert a written objection rather than provide a substantive response. Rule 33 requires that the grounds for each objection be stated with specificity; a boilerplate “objection, irrelevant” with nothing behind it is likely to be overruled.1Legal Information Institute. Federal Rules of Civil Procedure Rule 33 – Interrogatories to Parties Common grounds include:
- Privilege, such as attorney-client privilege or the work product doctrine.
- Irrelevance, when the question has no bearing on any claim or defense.
- Overbreadth or undue burden, such as a demand for “all documents related to your business operations” with no time frame.
Your attorney signs the objections; that signature is separate from your personal verification on the factual answers.1Legal Information Institute. Federal Rules of Civil Procedure Rule 33 – Interrogatories to Parties If the other side disagrees with an objection, they can file a motion to compel. If the judge overrules the objection, you will be ordered to answer, and the losing side on the motion typically pays the winner’s expenses.4Legal Information Institute. Federal Rules of Civil Procedure Rule 37 – Failure to Make Disclosures or to Cooperate in Discovery Sanctions A proper objection protects you from answering an improper question; it does not give you cover to withhold facts you simply prefer not to disclose.