Interrogatories under New York’s CPLR are written questions one party serves on another party in a civil lawsuit, which must be answered in writing and under oath within 20 days. The rules governing them, found mainly in CPLR 3130 through 3133, are stricter than many litigants expect: you often cannot combine interrogatories with other discovery tools, the format is prescribed, and missing a deadline or ignoring a request can cost you the case.
Who Can Serve Them and Who Must Answer
Under CPLR 3132, any party to a lawsuit may serve written interrogatories on any other party once the action has been commenced.1New York State Senate. New York Civil Practice Law and Rules Law R3132 – Service of Interrogatories There is one timing catch at the front end: you cannot serve interrogatories on a defendant before that defendant’s time to file a responsive pleading has expired, unless you get leave of court. A copy of the interrogatories must also be served on every other party in the case.
Interrogatories reach only parties. Non-party witnesses, retained experts, and anyone else outside the caption are off limits. In multi-party litigation you can direct interrogatories to any opposing party, but each set has to comply with the numerical limits in CPLR 3130.2New York State Senate. New York Civil Practice Law and Rules Law 3130 – Use of Interrogatories
When the responding party is a corporation, partnership, or sole proprietorship, an officer, director, member, agent, or employee with the relevant information must answer in writing under oath on the entity’s behalf, per CPLR 3133(b).3New York State Senate. New York Civil Practice Law and Rules Law R3133 – Service of Answers or Objections to Interrogatories Picking the right person matters. If the designated individual has no personal knowledge, the answers can be challenged as inadequate.
Restrictions on Combining Discovery Methods
CPLR 3130(1) sets two rules that trap unwary practitioners. First, in every case except matrimonial actions, a party who serves interrogatories on another party cannot also demand a bill of particulars from that same party. Pick one.2New York State Senate. New York Civil Practice Law and Rules Law 3130 – Use of Interrogatories
Second, in negligence-based actions for personal injury, property damage, or wrongful death, you cannot both serve interrogatories on someone and depose that same party without leave of court. The limitation applies only where the claims rest solely on negligence; if the complaint includes intentional tort or strict liability theories, it drops away. Courts will grant permission to use both methods on a showing of good cause, but the request has to come first.
What You Can Ask About
CPLR 3131 ties interrogatories to the general disclosure standard in CPLR 3101: your questions may cover any matter “material and necessary” to prosecuting or defending the action.4New York State Senate. New York Civil Practice Law and Rules Law 3131 – Scope of Interrogatories New York courts read that phrase liberally, so most questions with a reasonable connection to the claims or defenses will survive challenge.5New York State Senate. New York Civil Practice Law and Rules Law 3101 – Scope of Disclosure
Interrogatories can also require the other party to attach copies of papers, documents, or photographs relevant to the answers, unless you have already been given an opportunity to examine and copy those materials.4New York State Senate. New York Civil Practice Law and Rules Law 3131 – Scope of Interrogatories That makes them more versatile than many litigants realize, since they can double as informal document requests.
Questions still have to be clear and specific enough for the other side to answer meaningfully. Something like “identify every fact supporting your defense” will almost certainly draw an objection as overbroad. Better practice is to ask about specific dates, people, communications, or events tied to particular claims. Questions cannot cross into privileged territory either: under CPLR 3101(b), attorney-client communications and attorney work product are protected, and interrogatories probing legal strategy or confidential advice are improper.5New York State Senate. New York Civil Practice Law and Rules Law 3101 – Scope of Disclosure
One reason to draft interrogatories carefully on both sides: answers can be used at trial to the same extent as deposition testimony of a party.4New York State Senate. New York Civil Practice Law and Rules Law 3131 – Scope of Interrogatories Sworn answers can be read into the record or used for impeachment, so careless responses create real trial problems.
The 20-Day Response Deadline
Under CPLR 3133, the responding party has 20 days after service of the interrogatories to serve answers or objections on every other party in the case.3New York State Senate. New York Civil Practice Law and Rules Law R3133 – Service of Answers or Objections to Interrogatories That 20-day clock is statutory, but parties frequently agree to extensions by stipulation, and courts will grant more time on motion for legitimate reasons like a large volume of questions or difficulty gathering the information.
CPLR 3132 sets no specific late-in-the-case cutoff for when interrogatories may be served, beyond the requirement that a defendant’s time to answer must have expired.1New York State Senate. New York Civil Practice Law and Rules Law R3132 – Service of Interrogatories Individual courts and judges often impose their own discovery cutoff dates through scheduling orders, though. Serving interrogatories so late that the 20-day response period would extend past the discovery deadline is a common way to lose the right to compel answers, so building in a cushion is practical.
Verification and Format of Answers
Interrogatory answers must be in writing and sworn. CPLR 3133(b) is explicit. Individual parties personally swear to their own answers; for business entities, the designated person with knowledge swears to them.3New York State Senate. New York Civil Practice Law and Rules Law R3133 – Service of Answers or Objections to Interrogatories
Each question must be answered separately and fully, and the question itself must appear immediately before each answer or objection. That formatting requirement is not optional. Responses that lump multiple questions together or omit the question text are technically deficient and can be challenged.
Because the answers are sworn, they carry the same weight as testimony. A false answer exposes the responding party to perjury consequences and guarantees damaging impeachment at trial. Attorneys draft the responses, but the party bears responsibility for their accuracy.
Objections and Protective Orders
When a party believes an interrogatory is improper, CPLR 3133(a) permits an objection in place of an answer. The objection must state its reasons with “reasonable particularity.” A bare “overbroad” or “irrelevant” will not hold up. Courts expect an explanation of why the question is overbroad, what specific privilege applies, or how answering would impose an undue burden.3New York State Senate. New York Civil Practice Law and Rules Law R3133 – Service of Answers or Objections to Interrogatories
Objections must be served within the same 20-day window as answers. If you answer some interrogatories and object to others, both go out at once. The burden then shifts to the propounding party to rework the question or file a motion to compel.
Where the problem is broader than a single question, CPLR 3103 allows a party to seek a protective order. The court can deny, limit, condition, or regulate the use of interrogatories to prevent unreasonable annoyance, expense, embarrassment, disadvantage, or other prejudice.6New York State Senate. New York Civil Practice Law and Rules Law 3103 – Protective Orders Protective orders are common when interrogatories seek trade secrets, confidential business information, or personal details with no real connection to the litigation. Courts sometimes permit responses under seal or subject to a confidentiality agreement.
Amending or Supplementing Answers
Once answers go out, changing them is not easy. Under CPLR 3133(c), answers may be amended or supplemented only by court order on motion, with one exception: the continuing duty to supplement under CPLR 3101(h).3New York State Senate. New York Civil Practice Law and Rules Law R3133 – Service of Answers or Objections to Interrogatories
CPLR 3101(h) requires a party to promptly amend or supplement a prior discovery response upon learning that the original answer was incomplete, inaccurate, or no longer correct.5New York State Senate. New York Civil Practice Law and Rules Law 3101 – Scope of Disclosure That obligation runs through the life of the case. If new facts surface that make a previous answer wrong or misleading, sitting on the information can lead to preclusion of evidence at trial or other sanctions.
Any amendment that goes beyond the 3101(h) duty requires a motion and the court’s permission. Courts weigh whether the amendment is sought in good faith, whether the other side will be prejudiced, and how far the case has progressed.
Try to Resolve It Before Filing a Motion
Before any discovery dispute reaches a New York court, the parties have to try to work it out. Under 22 NYCRR 202.7, every motion relating to disclosure must be accompanied by an affirmation from counsel stating that a good faith effort was made to resolve the issues with opposing counsel.7New York State Unified Court System. Uniform Civil Rules for the Supreme Court and the County Court Part 202
The affirmation must describe the time, place, and nature of the consultation, the issues discussed, and any resolutions reached. If no consultation happened, counsel has to explain why. Filing a motion to compel without this affirmation is a procedural defect that can result in denial of the motion regardless of its merits. In practice, judges want to see a phone call or in-person discussion, not just an exchange of letters.
Consequences for Ignoring Interrogatories
If a party ignores interrogatories or serves evasive non-answers, the first step is a motion to compel under CPLR 3124. The court can order the non-responding party to provide answers within a set timeframe.8New York State Senate. New York Civil Practice Law and Rules 3124 – Failure to Disclose; Motion to Compel Disclosure
When a party then disobeys the compelling order, or willfully fails to provide information the court determines should have been disclosed, CPLR 3126 authorizes escalating penalties. The court may:
- Deem the disputed facts resolved in favor of the party seeking the information.
- Strike some or all of the non-compliant party’s pleadings.
- Stay the proceedings until the party complies.
- Dismiss the action or enter a default judgment against the non-compliant party.
These penalties are not automatic. Courts apply them based on the severity and willfulness of the noncompliance and generally impose the least harsh sanction that will achieve compliance.9New York State Senate. New York Civil Practice Law and Rules Law 3126 – Penalties for Refusal to Comply With Order or to Disclose Repeated or deliberate refusals to engage in discovery, though, are exactly the kind of conduct that draws case-ending sanctions. Courts may also award the requesting party reasonable attorneys’ fees and costs incurred in bringing the motion.