Except as otherwise provided by R. 4:17-4(e), if a party who has furnished answers to interrogatories thereafter obtains information that renders such answers incomplete or inaccurate, amended answers shall be served not later than 20 days prior to the end of the discovery period, as fixed by the track assignment or subsequent order. Amendments may be allowed thereafter only if the party seeking to amend certifies therein that the information requiring the amendment was not reasonably available or discoverable by the exercise of due diligence prior to the discovery end date. In the absence of said certification, the late amendment shall be disregarded by the court and adverse parties. Any challenge to the certification of due diligence will be deemed waived unless brought by way of motion on notice filed and served within 20 days after service of the amendment. Objections made thereafter shall not be entertained by the court. All amendments to answers to interrogatories shall be binding on the party submitting them. A certification of the amendments shall be furnished promptly to any other party so requesting.
Rule 4:17-7.Amendment of answers
Last amended September 1, 2004 · Current through June 18, 2026 · Last verified July 7, 2026
In one sentenceRule 4:17-7 requires a party whose interrogatory answers become incomplete or inaccurate to serve amended answers no later than 20 days before the end of discovery, and allows later amendment only on a certification that the information could not have been discovered earlier with due diligence.
Full Text of Rule 4:17-7
Amendment History
New Jersey publishes each rule’s amendment record in a “History” note beneath the rule. It is reproduced verbatim below; the “R.R.” citations refer to the former Revised Rules numbering the current rules replaced.
Source-R.R. 4:23-12; amended July 29, 1977 to be effective September 6, 1977; amended September 9, 1982 to be effective September 14, 1982; amended July 22, 1983 to be effective September 12, 1983; amended June 29, 1990 to be effective September 4, 1990; amended July 5, 2000 to be effective September 5, 2000; amended July 12, 2002 to be effective September 3, 2002; amended July 28, 2004 to be effective September 1, 2004.
Plain-English Summary
Interrogatory answers must be kept current, and this rule sets the deadline. A party that later obtains information making its answers incomplete or inaccurate must serve amended answers no later than 20 days before the end of the discovery period fixed by the track assignment or a later order.
After that, the door narrows. A late amendment is allowed only if the party certifies that the new information was not reasonably available or discoverable by due diligence before the discovery end date; without that certification, the court and adverse parties disregard the amendment. A challenge to the certification must be raised by motion within 20 days, and all amendments bind the party that submits them.
Frequently Asked Questions
Do you have to update interrogatory answers?
Yes. If answers become incomplete or inaccurate, amended answers must be served no later than 20 days before the end of discovery. Later amendments are allowed only on a certification that the information could not have been found earlier through due diligence.
Source & verification. The rule text and amendment history are reproduced verbatim from the
official New Jersey Rules of Court (N.J. Ct. R. 4:17-7). Prescribed by the Supreme Court of New Jersey (N.J. Const. art. VI, § 2, ¶ 3). The plain-English summary is original and written by us. Last verified July 7, 2026. ·
Official source
Also known as: amendment of interrogatory answersamended answerssupplementing interrogatoriesdue diligence certification