Unless otherwise limited by order of the court in accordance with the rules in this chapter, the scope of discovery shall be as provided in this division.
Rule 1.503.Scope of discovery
Division V: Discovery and Inspection · Last amended January 1, 2015 · Last verified July 15, 2026
In one sentenceRule 1.503 defines how far discovery can reach in an Iowa civil case: any non-privileged matter relevant to the claims or defenses, subject to work-product protection for trial-preparation materials, a continuing duty to supplement, a certification requirement for every discovery request and response, and an overarching proportionality limit tying discovery to the needs, stakes, and burdens of the case.
Full Text of Rule 1.503
(1) In general. Parties may obtain discovery regarding any matter, not privileged, which is relevant to the subject matter involved in the pending action, whether it relates to the claim or defense of the party seeking discovery or to the claim or defense of any other party, including the existence, description, nature, custody, condition, and location of any books, documents, or other tangible things, the identity and location of persons having knowledge of any discoverable matter, and the identity of witnesses the party expects to call to testify at the trial. It is not ground for objection that the information sought will be inadmissible at the trial if the information sought appears reasonably calculated to lead to the discovery of admissible evidence.
a. Unless otherwise provided in a request for discovery, a request for the production of a "document" or "documents" shall encompass electronically stored information. Any reference in the rules in this division to a "document" or "documents" shall encompass electronically stored information.
b. All discovery is subject to the limitations of rule 1.503 (8).
(2) Insurance agreements. In addition to the initial disclosures required by rule 1.500 (1)(a)(4), a party may obtain discovery of the existence and contents of any insurance agreement under which any person carrying on an insurance business may be liable to satisfy part or all of a judgment which may be entered in the action or to indemnify or reimburse for payments made to satisfy the judgment. Information concerning the insurance agreement is not by reason of disclosure admissible in evidence at trial. For purposes of this rule, an application for insurance shall not be treated as part of an insurance agreement.
(3) Trial-preparation materials. Subject to the provisions of rule 1.508, a party may obtain discovery of documents and tangible things otherwise discoverable under rule 1.503 (1) and prepared in anticipation of litigation or for trial by or for another party or by or for that other party's representative (including the party's attorney, consultant, surety, indemnitor, insurer, or agent) only upon a showing that the party seeking discovery has substantial need of the materials in the preparation of the case and that the party seeking discovery is unable without undue hardship to obtain the substantial equivalent of the materials by other means. In ordering discovery of such materials when the required showing has been made, the court shall protect against disclosure of the mental impressions, conclusions, opinions, or legal theories of an attorney or other representative of a party concerning the litigation.
A party may obtain without the required showing a statement concerning the action or its subject matter previously made by that party. Upon request, a person not a party may obtain without the required showing a statement concerning the action or its subject matter previously made by that person. If the request is refused, the person may move for a court order. The provisions of rule 1.517 (1)(d) apply to the award of expenses incurred in relation to the motion. For purposes of this rule, a statement previously made is any of the following:
a. A written statement signed or otherwise adopted or approved by the person making it.
b. A stenographic, mechanical, electrical, or other recording, or a transcription thereof, which is a substantially verbatim recital of an oral statement by the person making it and contemporaneously recorded.
(4) Supplementing disclosures and responses. A party who has made a disclosure under rule 1.500, or who has responded to a request for discovery, must timely supplement or correct the party's disclosure or response as follows:
a. A party must timely supplement or correct any disclosure or response that concerns any of the following:
(1) The identity and location of persons having knowledge of discoverable matters.
(2) The identity of each person expected to be called as a witness at trial.
(3) Any matter that bears materially upon a claim or defense asserted by any party to the action.
b. A party is under a duty seasonably to supplement or correct its disclosure or a prior response if the party learns that in some material respect the disclosure or response is incomplete or incorrect, and if the additional or corrective information has not otherwise been made known to the other parties during the discovery process or in writing.
c. As provided in rule 1.508 (3), a party must supplement discovery as to experts and the substance of their testimony.
d. An additional duty to supplement responses may be imposed by order of the court, agreement of the parties, or at any time prior to trial through new requests to supplement prior responses.
(5) Claims of privilege or protection of trial-preparation materials.
a. Information withheld. When a party withholds information otherwise discoverable under these rules by claiming that it is privileged or subject to protection as trial-preparation material, the party shall make the claim expressly and shall describe the nature of the documents, communications, or things not produced or disclosed in a manner that, without revealing information itself privileged or protected, will enable other parties to assess the applicability of the privilege or protection.
b. Information produced. If information is produced in discovery that is subject to a claim of privilege or of protection as trial-preparation material, the party making the claim may notify any party that received that information of the claim and the basis for it. After being notified, a party must promptly return, sequester, or destroy the specified information and any copies it has and may not use or disclose the information until the claim is resolved. A receiving party may promptly present the information to the court under seal for a determination of the claim. If the receiving party disclosed the information before being notified, it must take reasonable steps to retrieve it. The producing party must preserve the information until the claim is resolved.
(6) Signing disclosures and discovery requests, responses, and objections.
a. Signature required; effect of signature. Every disclosure under rule 1.500 and every discovery request, response, or objection must be signed by at least one attorney of record in the attorney's own name--or by the party personally, if unrepresented--and must state the signer's name, law firm, or name of partnership, association, corporation, or tribe on behalf of which the filing agent is signing, and mailing address, telephone number, and electronic mail address. By signing, an attorney or party certifies that to the best of the person's knowledge, information, and belief formed after a reasonable inquiry:
(1) The disclosure is complete and correct as of the time it is made.
(2) The discovery request, response, or objection is:
1. Consistent with these rules and warranted by existing law or by a nonfrivolous argument for extending, modifying, or reversing existing law, or for establishing new law.
2. Not interposed for any improper purpose, such as to harass, cause unnecessary delay, or needlessly increase the cost of litigation.
3. Neither unreasonable or unduly burdensome or expensive, considering the needs of the case, prior discovery in the case, the amount in controversy, and the importance of the issues at stake in the action.
b. Failure to sign. Other parties have no duty to act on an unsigned disclosure, request, response, or objection until it is signed, and the court must strike it unless a signature is promptly supplied after the omission is called to the attorney's or party's attention.
c. Sanction for improper certification. If a certification violates this rule without substantial justification, the court, on motion or on its own, shall impose an appropriate sanction on the signer, the party on whose behalf the signer was acting, or both. The sanction may include an order to pay the reasonable expenses, including attorney fees, caused by the violation.
(7) Reliance on disclosures and discovery responses of other parties. Any party may rely on any other party's disclosures or discovery responses to the extent permitted by otherwise applicable evidentiary rules and regardless of when that party is joined. Unless requested to do so by a current party, the responding party has no duty to supplement its responses to discovery requests after the propounding party has been dismissed from the case.
(8) Limitations on frequency and extent. On motion or on its own, the court shall limit the frequency or extent of discovery otherwise allowed by these rules if it determines that:
a. The discovery sought is unreasonably cumulative or duplicative, or can be obtained from some other source that is more convenient, less burdensome, or less expensive;
b. The party seeking discovery has had ample opportunity to obtain the information by discovery in the action; or
c. The burden or expense of the proposed discovery outweighs its likely benefit, considering the needs of the case, the amount in controversy, the parties' resources, the importance of the issues at stake in the action, and the importance of the discovery in resolving the issues.
Comment
Rule 1.503
(2). Notwithstanding the initial disclosure obligation in rule 1.500 (1)(a)(4), rule 1.503 (2) clarifies that additional discovery regarding insurance is still allowed, but the fruits of that discovery will not necessarily be admissible.
[Court Order August 28, 2014, effective January 1, 2015]
Rule 1.503
(4)
(b). The amendment eliminates the "knowing concealment" requirement that had triggered the duty to supplement incorrect discovery responses. Rule 1.503 (4)(b) now tracks the federal rule by requiring supplementation of any response that the answering party learns is materially incomplete or incorrect unless that information has already otherwise been disclosed in discovery. See Fed. R. Civ. P. 26(e)(1)(A).
[Court Order August 28, 2014, effective January 1, 2015]
Rule 1.503
(6). The rule is patterned on Federal Rule of Civil Procedure 26(g). Having a separate certification requirement tailored specifically to discovery more effectively deters discovery abuse. See rule 1.413 (1) (providing that its certification obligation does not apply to discovery).
[Court Order August 28, 2014, effective January 1, 2015]
Rule 1.503(4) states the duty to supplement in the affirmative and expands that duty to require supplementation as to material matters and as to experts.
Plain-English Summary
Rule 1.503(1) sets the general scope: parties may discover any non-privileged matter relevant to the subject matter of the action, whether it relates to the requesting party's own claim or defense or to any other party's, including the existence and location of documents and tangible things, the identity and location of people with knowledge of discoverable matters, and the identity of trial witnesses. Information doesn't have to be admissible at trial itself to be discoverable, so long as it appears reasonably calculated to lead to admissible evidence — a notably broader gate than admissibility. Documents automatically include electronically stored information, and all of it is subject to the proportionality limits in Rule 1.503(8).
Rule 1.503(2) allows discovery of the existence and content of any insurance agreement that might cover a judgment in the case, though that fact isn't itself admissible at trial; the official Comment clarifies that this discovery is available beyond the initial disclosure of the declarations page Rule 1.500 already requires. Rule 1.503(3) protects trial-preparation materials — documents and tangible things a party or its representative prepared in anticipation of litigation are discoverable only on a showing of substantial need, and the court must always protect an attorney's mental impressions, opinions, and legal theories. A party can obtain its own prior statement about the case without that showing, and a non-party can do the same for a statement it made.
Rule 1.503(4) imposes an ongoing duty to supplement or correct a disclosure or response about who has relevant knowledge, who will testify, or any matter bearing materially on a claim or defense, once a party learns the earlier information was incomplete or wrong and that hasn't otherwise come out in discovery. The official Comment explains this eliminated an older knowing-concealment trigger and now tracks the federal supplementation standard, with a separate duty for experts under Rule 1.508(3). Rule 1.503(5) covers privilege and work-product claims: a party withholding material must describe it, without revealing the privileged content, well enough for others to assess the claim, and if privileged material is produced by mistake, the producing party can notify the recipient, who must then return, sequester, or destroy it and hold off using it until a court resolves the claim.
Rule 1.503(6) requires every discovery request, response, and objection to be signed, and signing certifies it's complete and correct, legally warranted, not made for an improper purpose like harassment or delay, and not unreasonable or overly burdensome given the case's needs and stakes. The official Comment explains this certification, patterned on the federal rule, exists specifically to deter discovery abuse; a violation without substantial justification requires the court to sanction the signer, the party, or both, potentially including the other side's reasonable expenses and attorney fees. Finally, Rule 1.503(8) requires the court, on motion or on its own, to limit discovery that's unreasonably cumulative or available more easily elsewhere, sought by a party that already had ample opportunity to get it, or whose burden or expense outweighs its likely benefit once the case's needs, the amount in controversy, the parties' resources, and the importance of the issues and the discovery itself are weighed. That proportionality standard, adopted along with several companion changes in 2014, brought Iowa's discovery rules in line with modern federal practice.
Frequently Asked Questions
Does information have to be admissible at trial to be discoverable under Rule 1.503?
No. Rule 1.503(1) allows discovery of non-privileged, relevant matter even if it wouldn't be admissible at trial, as long as it appears reasonably calculated to lead to the discovery of admissible evidence.
What is ‘trial-preparation material’ and how is it protected from discovery?
Documents and tangible things a party or its representative prepared in anticipation of litigation. Rule 1.503(3) allows discovery of that material only on a showing of substantial need, and the court must always protect an attorney's mental impressions, conclusions, opinions, and legal theories.
What happens if I accidentally produce a privileged document?
Rule 1.503(5) lets you notify the party that received it of the claim of privilege. The receiving party must then promptly return, sequester, or destroy the information and any copies, and can't use or disclose it until a court resolves the claim.
What does it mean to certify a discovery response, and what happens if I violate that certification?
Signing a discovery request, response, or objection under Rule 1.503(6) certifies it is complete and correct, legally warranted, not made for an improper purpose, and not unreasonable or unduly burdensome. If a certification violates the rule without substantial justification, the court must impose an appropriate sanction on the signer, the party, or both.
How does the proportionality standard in Rule 1.503(8) limit discovery?
It requires the court to limit discovery that's unreasonably cumulative, obtainable more easily elsewhere, already pursued to the point of ample opportunity, or whose burden or expense outweighs its likely benefit given the case's needs, the amount in controversy, the parties' resources, and the importance of the issues at stake.
Source & verification. Rule text and the Comment are
reproduced verbatim from the Iowa Rules of Civil Procedure, adopted by the
Iowa Supreme Court. Last verified July 15, 2026.
· Official source
Also known as: iowa scope of discovery ruleiowa proportionality discovery standardiowa work product privilege discoveryiowa discovery certification sanctionsclawback privileged document iowa