Motion to Compel Interrogatory Responses in California: Deadlines, Requirements & Strategy (CCP §§ 2030.290 & 2030.300)

California Motion to Compel Interrogatories — At a Glance

§ 2030.290 vs. § 2030.300: Which Motion to Compel Applies to Your Situation

This threshold question determines everything: the statute you cite, whether you need a separate statement, whether meet-and-confer is required, and whether a deadline applies. Getting it wrong can be fatal to your motion.

Motion to Compel Responses (CCP § 2030.290): This motion applies when the responding party has failed to serve any timely response at all, or has served only an unverified response without objections. Because unverified responses are "tantamount to no responses at all," they trigger the same remedy as total silence. (Appleton v. Superior Court (1988) 206 Cal.App.3d 632, 635–636 [unverified responses without objections treated as no response].)

Motion to Compel Further Responses (CCP § 2030.300): This motion applies when responses were served but are deficient—answers that are evasive or incomplete, or objections that lack merit or are too general. (CCP § 2030.300(a).)

If no verified response was served and you mistakenly file under § 2030.300, you may find yourself scrambling to meet procedural requirements (separate statement, meet-and-confer declaration) that don't apply to your situation—or worse, the court may analyze your motion under the stricter 45-day deadline and deny it as untimely.

When to File a Motion to Compel Initial Responses Under § 2030.290

Total Silence. The most straightforward scenario is when the responding party fails to serve any written response by the statutory deadline. Responses are generally due 30 days after service, plus any applicable service extensions (5 calendar days for mail within California under CCP § 1013(a); 2 court days for electronic service under CCP § 1010.6(a)(3)(B)). If that deadline passes with no response, the right to move under § 2030.290 accrues immediately.

The Unverified Response Trap. A more nuanced scenario arises when the opposing party serves a document labeled "Responses to Interrogatories" but fails to include a verification. Unless a response contains only objections, it must be verified—signed under oath by the responding party. (CCP § 2030.250.) An unverified factual response is legally a nullity. (Appleton, supra, 206 Cal.App.3d at 635–636.) This means you may bring a motion to compel responses under § 2030.290 rather than a motion to compel further responses, avoiding the 45-day deadline entirely.

§ 2030.290 Procedural Advantages: No Deadline, No Meet and Confer, No Separate Statement

Unlike motions to compel further responses, there is no statutory deadline to file a motion to compel initial responses. (Sinaiko Healthcare Consulting, Inc. v. Pacific Healthcare Consultants (2007) 148 Cal.App.4th 390, 404 [45-day rule does not apply to § 2030.290].) The motion may be brought at any time, subject only to the general discovery motion cutoff—15 days before the initial trial date. (CCP § 2024.020(a).)

However, waiting too long has practical drawbacks. Delay may signal to the court that the discovery was not urgent, influencing the court's discretion on sanctions or trial continuances.

There is no statutory requirement to meet and confer before filing a motion under § 2030.290. (Sinaiko, supra, 148 Cal.App.4th at 404.) Because no response was served, there is nothing to resolve—the violation is the silence itself. (Leach v. Superior Court (1980) 111 Cal.App.3d 902, 906 [when no timely response served, "there is thus nothing to 'resolve'" by meet-and-confer].)

A separate statement is not required when no response has been provided. (CRC 3.1345(b)(1).) This makes the § 2030.290 motion significantly faster and cheaper to prepare.

Automatic Waiver of All Objections — Including Privilege — When No Timely Response Is Served

The primary strategic value of the § 2030.290 motion is the waiver provision. The statute provides that if a party fails to serve a timely response, that party waives any objection to the interrogatories, including one based on privilege or on the protection for work product. (CCP § 2030.290(a).)

Because the waiver encompasses privilege, filing this motion often prompts immediate compliance and an offer to pay sanctions in exchange for withdrawing it. The threat of privilege waiver is one of the most powerful settlement levers in discovery practice.

Mandatory Sanctions for Failure to Serve Timely Interrogatory Responses (§ 2030.290(c))

Under CCP § 2030.290(c), the court shall impose a monetary sanction against the party who unsuccessfully opposes a motion to compel responses, unless that party acted with substantial justification or other circumstances make the sanction unjust. In practice, if no timely response was served and the responding party has no valid excuse, sanctions are nearly automatic.

Include the sanctions request in the Notice of Motion, specifying the amount sought and against whom (party, attorney, or both jointly and severally). (CCP § 2023.040.) In your declaration, detail hours spent on the motion, your hourly rate, and filing fees. Issue, evidence, or terminating sanctions are not available on a first motion to compel. (CCP § 2030.290(c).) Harsher sanctions require a prior court order that the party subsequently violates.

Drafting the § 2030.290 Motion Papers

The Notice should specify the relief sought (an order compelling responses without objections), the statutory basis, the discovery at issue (identify the set number), and any sanctions request.

Sample Notice Language:

"Plaintiff moves for an order compelling Defendant to serve verified responses, without objections, to Plaintiff's Special Interrogatories, Set One, pursuant to Code of Civil Procedure section 2030.290(b). Plaintiff further moves for monetary sanctions in the amount of $1,500 against Defendant and counsel of record pursuant to Code of Civil Procedure section 2030.290(c)."

Since no separate statement is required, the declaration is the primary evidentiary document. It must establish:

• Service of Discovery: Authenticate the interrogatories and state the date and method of service. Attach the interrogatories and proof of service as an exhibit.
• Deadline Calculation: State the date responses were due. Example: "Interrogatories were served by email on May 1, 2025. Pursuant to Code of Civil Procedure section 1010.6, responses were due June 3, 2025 (30 days plus 2 court days)."
• Failure to Respond: A clear statement under penalty of perjury: "As of the date of this declaration, no responses have been received."
• Sanctions Foundation: A breakdown of attorney time spent preparing the motion, hourly rate, and filing fee to support the sanctions request.

The Memorandum of Points and Authorities should address five points: (1) discovery was properly served (CCP § 2030.010); (2) no response was served within the statutory time (CCP § 2030.260); (3) an order compelling responses without objections is mandatory (CCP § 2030.290(a)–(b); Sinaiko Healthcare Consulting, Inc. v. Pacific Healthcare Consultants (2007) 148 Cal.App.4th 390, 404–405); (4) objections are waived by operation of law (CCP § 2030.290(a); Leach, supra, 111 Cal.App.3d at 906); and (5) sanctions are mandatory unless the opposing party demonstrates substantial justification (CCP § 2030.290(c)).

The Proposed Order should specifically state: "Defendant shall serve verified responses to Plaintiff's Special Interrogatories, Set One, without objections, within [10/20] days of notice of this ruling."

What Qualifies as an Evasive or Incomplete Interrogatory Response

Understanding why specific responses fail helps you evaluate whether you have grounds under § 2030.300 and articulate those grounds in your separate statement.

Incomplete or Evasive Answers

Every interrogatory answer must be "as complete and straightforward as the information reasonably available to the responding party permits." (CCP § 2030.220(a).) A party cannot deliberately misconstrue a question to supply an evasive answer. (Deyo v. Kilbourne (1978) 84 Cal.App.3d 771, 783.)

The "I Don't Recall" Problem. If a party claims lack of knowledge, CCP § 2030.220(c) requires the party to "so state" and to "make a reasonable and good faith effort to obtain the information by inquiry to other natural persons or organizations." A bare "I don't recall" without describing any inquiry is evasive.

Interrogatory: "State the date you first noticed the water leak."

Non-Compliant Response: "I do not recall at this time."

Why It's Deficient: Under § 2030.220(c) and Deyo, the responding party must set forth the efforts made to secure the information and cannot plead ignorance to information obtainable from sources under their control. (Deyo, supra, 84 Cal.App.3d at pp. 782–783.) A bare assertion of lack of memory is evasive. (Id. at pp. 783–784.)

The "Refer to Documents" Evasion

CCP § 2030.230 allows a party to answer by producing documents if (1) a response would require making a compilation or summary of records, (2) the burden of deriving the answer is substantially the same for both parties, and (3) the response specifies the documents in sufficient detail to permit the propounding party to locate the answer.

A general reference to "documents produced" is improper.

Interrogatory: "Describe the maintenance performed on the vehicle in 2023."

Non-Compliant Response: "See documents produced in response to Request for Production, Set One."

Why It's Deficient: The response fails to specify which documents contain the answer. It does not cite Bates numbers or specific file names. The burden is shifted entirely to the propounding party to search through a document production. This is grounds for a motion to compel further. (CCP § 2030.300(a)(2).)

Boilerplate and Meritless Objections

Objections that are "too general" or "without merit" are grounds for a motion to compel further responses. (CCP § 2030.300(a)(3).)

"Vague and Ambiguous." An interrogatory's ambiguity alone does not justify refusing to respond outright. (Cembrook v. Superior Court (1961) 56 Cal.2d 423, 428–429.) If the nature of the information sought is apparent, the responding party must answer to the extent possible and not refuse outright on a hair-splitting objection. (Deyo, supra, 84 Cal.App.3d at 783.) Objecting to defined terms like "INCIDENT" in form interrogatories—where the definition is provided in the discovery itself—rarely succeeds.

"Overbroad and Unduly Burdensome." The party asserting burden must supply factual evidence detailing the amount of work required to demonstrate that the burden outweighs the benefit. (Williams v. Superior Court (2017) 3 Cal.5th 531, 542.) A bare assertion of "unduly burdensome" is legally meritless. (West Pico Furniture Co. v. Superior Court (1961) 56 Cal.2d 407, 417.) Answering interrogatories requires writing responses—that burden is inherent in litigation.

"Calls for Legal Conclusion" or "Assumes Facts." These objections are rarely valid for interrogatories seeking factual information. If the interrogatory asks for facts, the objection is meritless.

Privilege. A blanket privilege objection, without identifying the specific basis and confirming that no non-privileged responsive information is withheld, is not code-compliant. Facts are not privileged merely because they were communicated to an attorney. (State Farm Fire & Cas. Co. v. Superior Court (1997) 54 Cal.App.4th 625, 639.)

"General Objections." A preamble listing every objection known to law, applied globally rather than to specific interrogatories, is improper. Objections must be stated separately to each interrogatory and must be specific. Courts have condemned "cut-and-paste" boilerplate objections. (Korea Data Systems Co. Ltd. v. Superior Court (1997) 51 Cal.App.4th 1513 [boilerplate general objections are sanctionable]; Clement v. Alegre (2009) 177 Cal.App.4th 1277, 1284, 1287–1288 [upholding sanctions for meritless, nitpicking objections to interrogatories].)

Three Grounds to Compel Further Interrogatory Responses Under § 2030.300

CCP § 2030.300(a) authorizes a motion to compel further responses on three grounds:

1. Evasive or Incomplete Answers: The answer is non-responsive, claims lack of knowledge without reasonable investigation, or refers to documents improperly.
2. Meritless or General Objections: The objection is "too general," lacks legal basis, or is applied improperly to the specific interrogatory.
3. Improper Document Production: The party exercised the option to produce documents under § 2030.230, but the documents do not contain the answer or are not properly specified.

45-Day Jurisdictional Deadline to File a Motion to Compel Further Responses (CCP § 2030.300(c))

The motion to compel further responses is subject to a strict jurisdictional deadline. Notice of the motion must be given within 45 days of service of the verified response, absent a written agreement to extend. (CCP § 2030.300(c).)

If the response was served by mail within California, add 5 calendar days. If served electronically, add 2 court days. Calculate this deadline the moment you receive responses and calendar it immediately.

Extending by Written Agreement. The statute allows the parties to extend the 45-day deadline by written agreement specifying a later date. (CCP § 2030.300(c).) This is routine practice to allow meaningful meet-and-confer efforts. The agreement must be in writing—never rely on a phone call alone. Immediately confirm any oral agreement by email: "This confirms our agreement that the deadline for Plaintiff to file a motion to compel further responses to Special Interrogatories, Set One, is extended to [date]."

In the Notice of Motion and Declaration, reference the extension: "This motion is timely filed pursuant to the written agreement of the parties extending the deadline to [date] per Code of Civil Procedure section 2030.300(c)." Attach the confirming correspondence as an exhibit.

Hybrid Responses and the Golf & Tennis Deadline Rule

A procedural minefield arises when a party serves unverified responses that contain both factual answers and objections. This "hybrid" response creates ambiguity about which motion to file and when deadlines run.

The Court of Appeal addressed this issue in Golf & Tennis Pro Shop, Inc. v. Superior Court (2022) 84 Cal.App.5th 127. The court held that if a response contains both unverified factual answers and objections:

• Objections Are Effective: Objections do not require verification to be valid. (Blue Ridge Ins. Co. v. Superior Court (1988) 202 Cal.App.3d 339.) Therefore, objections in a hybrid response are technically effective immediately.
• 45-Day Clock for Factual Deficiencies: The 45-day period to challenge the factual deficiency does not start until verification is served.
• Motion Type: A motion to compel further responses (not initial responses) is required to challenge objections served in lieu of substantive answers. (Golf & Tennis Pro Shop, Inc., supra, 84 Cal.App.5th at 136.)

Meet and Confer Requirements for a Motion to Compel Further Responses

A motion to compel further responses must be accompanied by a meet-and-confer declaration stating facts showing a "reasonable and good faith attempt, either in person, by telephone, or by videoconference, to informally resolve each issue presented by the motion." (CCP §§ 2030.300(b), 2016.040(a), as amended eff. Jan. 1, 2026.) Effective January 1, 2026, the declaration must also state whether the parties met and conferred about retaining a certified shorthand reporter for the hearing. (§ 2016.040(b).)

Courts examine the history of the dispute, nature of the requested discovery, and quality of counsel's efforts to resolve informally. (Obregon v. Superior Court (1998) 67 Cal.App.4th 424, 431.) The process requires "a serious effort at negotiation and informal resolution." (Townsend v. Superior Court (1998) 61 Cal.App.4th 1431, 1438.)

A perfunctory letter immediately followed by a motion is insufficient. Courts expect: a detailed letter identifying each deficient response and the specific legal reason it is deficient; at least one telephone call or in-person discussion (judges increasingly view exchanging only letters as insufficient—refusing to speak by phone may be deemed unreasonable); and documentation of all efforts in the declaration.

Documenting the Effort. The declaration must detail these efforts specifically.

Inadequate: "I met and conferred with counsel but we could not agree."

Adequate: "On June 1, 2025, I sent the letter attached as Exhibit C detailing defects in 14 interrogatories. On June 5, I called counsel. We discussed Interrogatories 4 and 6. Counsel agreed to supplement No. 4 but refused on No. 6, citing privacy. I offered to discuss protective order terms and extended the response deadline to June 15. No supplemental responses were served. We reached an impasse on the remaining items as detailed in the Separate Statement."

Separate Statement Requirements Under CRC 3.1345 for Motions to Compel Further Responses

A separate statement is required for all motions involving "the content of a discovery request or the responses to such a request." (CRC 3.1345(a).) This includes motions to compel further responses to interrogatories. No separate statement is required for a § 2030.290 motion when no response has been provided. (CRC 3.1345(b)(1).)

For each interrogatory at issue, the separate statement must include: (1) the full text of the interrogatory; (2) the full text of the response, including any objections; and (3) a statement of the factual and legal reasons why a further response should be compelled.

Include any definitions or instructions from the discovery needed to understand the interrogatory or answer. If the response refers to another discovery request or document, include that as well. (CRC 3.1345(c).)

The separate statement must be complete in itself—it should not incorporate by reference or require the judge to consult other documents. Quote the requests and responses; do not merely say "see Exhibit B." Judges often read the separate statement first (some read it exclusively) to understand the dispute.

No Good Cause Required for Interrogatory Motions: Burden Falls on the Objecting Party

There is no "good cause" requirement for moving to compel responses to interrogatories. Unlike motions to compel further responses to requests for production of documents—where the propounding party must demonstrate "good cause" for the discovery sought (CCP § 2031.310(b)(1))—motions to compel further interrogatory responses carry no such burden.

For interrogatories, the burden runs the other way. Once the propounding party establishes that a response is evasive, incomplete, or accompanied by meritless objections, the responding party must justify its refusal to answer. The objecting party bears the burden of demonstrating that the objection is valid. (Coy v. Superior Court (1962) 58 Cal.2d 210, 220–221 [burden on objecting party to justify objection].)

Drafting the § 2030.300 Motion Papers

Notice of Motion. The Notice must cite CCP § 2030.300. Specify which interrogatories are at issue by set number and interrogatory number (e.g., "Special Interrogatories, Set One, Nos. 4, 7, 12, and 15"). Include the sanctions request, specifying the amount sought and against whom. (CCP § 2023.040.)

Memorandum of Points and Authorities. The memorandum frames the legal argument across four components: an introduction briefly stating the case theory and why the discovery is relevant; the legal standard (cite the broad scope of discovery under CCP § 2017.010 and note that the burden is on the objector to justify refusal to answer); the argument proper, grouping the interrogatories by issue (e.g., "Defendant's Privacy Objections Are Meritless") rather than merely repeating the separate statement; and a sanctions argument that the opposition was "without substantial justification."

Declaration. The declaration authenticates exhibits and establishes your meet-and-confer compliance. Attach the interrogatories (Exhibit A), the responses (Exhibit B), the verification if served separately, meet-and-confer correspondence (Exhibit C), and a sanctions breakdown: hourly rate, hours spent, filing fee.

Proposed Order. Specify: "Defendant shall serve further verified responses to Special Interrogatories, Set One, Nos. [X], without objections, within [10/20] days of notice of this ruling. Defendant and counsel of record shall pay sanctions to Plaintiff in the amount of $[X] within 30 days."

Sanctions for Interrogatory Discovery Abuse

The Discovery Act has a strong policy of sanctions to encourage cooperation and make the aggrieved party whole.

Under § 2030.290(c), the court shall impose a monetary sanction against the party who unsuccessfully opposes a motion to compel responses, unless that party acted with substantial justification or other circumstances make the sanction unjust. If no timely response was served and the responding party has no valid excuse, sanctions are nearly automatic.

Under § 2030.300(d), the court must impose a monetary sanction against the party who "unsuccessfully makes or opposes" the motion, absent substantial justification. The losing party normally pays the winner's fees. If you lose your motion (e.g., the court finds the responses were adequate or your motion was procedurally defective), you may have to pay the opponent's fees.

The "Substantial Justification" Standard for Avoiding Sanctions

A position is substantially justified if it is "clearly reasonable because it is well-grounded in both law and fact," even if ultimately incorrect. (Doe v. U.S. Swimming, Inc. (2011) 200 Cal.App.4th 1424, 1434.) Examples of substantial justification include relying on a split in appellate authority or protecting a trade secret pending a protective order. Examples of no justification include boilerplate objections, claiming "I forgot" to verify, or refusing to meet and confer.

How to Calculate and Request Sanctions on a Motion to Compel

In your Notice of Motion, specify the amount sought and against whom (party, attorney, or both jointly and severally). (Code Civ. Proc., § 2023.040.) In your declaration, detail: hours spent on the motion (separately for each task if useful); your hourly rate (or the rate of the attorney who performed the work); and filing fees and other costs. Be reasonable — overstated requests may be reduced or denied.

Issue, Evidence, and Terminating Sanctions: When They Become Available After a Prior Court Order

Issue, evidence, or terminating sanctions are not available on a first motion to compel. (Code Civ. Proc., §§ 2030.290(c), 2030.300(e).) Harsher sanctions usually require a prior court order that the party subsequently violates. If the court orders further responses and the responding party still fails to comply, you may then move for escalating sanctions.

What Happens After the Court Grants a Motion to Compel

If Further Responses Are Served. Review them carefully. If still deficient, you have options, but filing another motion to compel further responses faces the same procedural requirements—and you must ensure you have a basis to move again.

If the Order Is Ignored. If the responding party fails to obey an order compelling responses, the court may impose issue sanctions, evidence sanctions, or terminating sanctions, in addition to further monetary sanctions. (CCP §§ 2030.290(c), 2030.300(e).) You would file a motion for sanctions detailing the violation. Courts often provide one additional warning before imposing case-dispositive sanctions, but repeated flouting of discovery obligations can lead to dismissal or default. (Liberty Mutual Fire Ins. Co. v. LcL Administrators, Inc. (2008) 163 Cal.App.4th 1093, 1106 [terminating sanctions appropriate after repeated violations].)

Common Mistakes When Filing a Motion to Compel Interrogatory Responses

Substantive Errors

Filing Under the Wrong Statute. Citing § 2030.300 (further responses) when no verified response was served—or citing § 2030.290 (initial responses) when a response was served—can result in denial. Check the verification first: no verification (without objections) = no response = § 2030.290.

Missing the 45-Day Deadline. Engaging in prolonged meet-and-confer without obtaining a written extension and then discovering the 45-day window has closed is a common and devastating error. The court loses jurisdiction. Calendar the deadline immediately upon receiving responses and obtain written extensions if needed.

Inadequate Grounds. Moving on every interrogatory, including those with arguably adequate responses, weakens your credibility. Focus on genuinely deficient responses. If some issues resolved during meet-and-confer, acknowledge that and narrow your motion.

Procedural Errors

Inadequate Meet and Confer Documentation. A conclusory declaration ("I met and conferred but we could not agree") is insufficient. Detail each attempt: letters sent (with dates and content), phone calls (summarize what was discussed), and outcomes. Attach correspondence as exhibits.

Deficient Separate Statement. Failing to file a separate statement when required, or filing one that omits required information (e.g., failing to quote the full response or failing to state specific grounds for each interrogatory), can result in denial. The separate statement must be self-contained—do not incorporate by reference. (Cal. Rules of Court, rule 3.1345(c).)

Incorrect Deadline Calculation. Forgetting to add service extensions (5 days for mail, 2 court days for electronic service) when calculating either the response deadline or the 45-day motion deadline can throw off your entire timeline.

Wrong Sanctions Calculation. Failing to include sanctions in the Notice of Motion, or failing to provide the factual basis (hours, rate) in the declaration, can result in denial of fees even if you win the motion.

Formatting and Filing Errors

Exhibits. Ensure exhibits are properly tabbed or labeled. Attach a complete copy of the interrogatories and responses at issue.

Page Limits. The memorandum has a 15-page limit. (Cal. Rules of Court, rule 3.1113(d).) If your memo exceeds 10 pages, include a table of contents and table of authorities. (Cal. Rules of Court, rule 3.1113(f).)

Local Rules. Check whether your judge or court has specific guidelines for discovery motions, Informal Discovery Conferences (IDCs), or tentative ruling procedures.

Frequently Asked Questions

When do I file under § 2030.290 vs. § 2030.300? File under § 2030.290 when no verified response was served at all (including when an unverified factual response was served without objections). File under § 2030.300 when a response was served but is evasive, incomplete, or accompanied by meritless objections. Check for verification first — it is the threshold determination.

What happens if I miss the 45-day deadline to compel further responses? You waive the right to compel further responses; a court may not entertain a belated motion. (Vidal Sassoon, Inc. v. Superior Court (1983) 147 Cal.App.3d 681, 685 [decided under the predecessor 30-day statute]; Sexton v. Superior Court (1997) 58 Cal.App.4th 1403, 1410.) Calendar this deadline the moment you receive responses.

Do I need to meet and confer before filing a motion to compel initial responses under § 2030.290? No. There is no statutory meet-and-confer requirement for a § 2030.290 motion. Because no response was served, there is nothing to resolve. (Sinaiko, supra, 148 Cal.App.4th at 404.)

Is a separate statement required for a § 2030.290 motion? No. A separate statement is not required when no response has been provided. (Cal. Rules of Court, rule 3.1345(b)(1).) It is required for § 2030.300 motions.

What objections are waived when no timely response is served? All of them — including attorney-client privilege and work product protection. The waiver is self-executing by operation of law the moment the deadline passes. (Code Civ. Proc., § 2030.290(a); Leach v. Superior Court (1980) 111 Cal.App.3d 902, 906.)

How do I handle a hybrid response containing both objections and unverified factual answers? Per Golf & Tennis Pro Shop, Inc. v. Superior Court (2022) 84 Cal.App.5th 127, objections are effective immediately without verification, but the 45-day clock for challenging factual deficiencies does not run until verification is served. Immediately send a meet-and-confer letter and do not assume the clock has stopped.

Can the 45-day deadline be extended? Yes, by written agreement specifying a later date. (Code Civ. Proc., § 2030.300(c).) Confirm any oral agreement by email immediately. Never rely on a phone call alone.

What sanctions can I request on a motion to compel interrogatory responses? Monetary sanctions are mandatory against the losing party absent substantial justification under both § 2030.290(c) and § 2030.300(d). In your Notice of Motion, specify the amount and against whom. Issue, evidence, or terminating sanctions are not available on a first motion — they require a prior court order that the party then violates.

What happens if the opposing party ignores a court order compelling responses? The court may impose issue, evidence, or terminating sanctions in addition to further monetary sanctions. (Code Civ. Proc., §§ 2030.290(c), 2030.300(e).) Repeated violations can lead to dismissal or default. (Liberty Mutual Fire Ins. Co. v. LcL Administrators, Inc. (2008) 163 Cal.App.4th 1093, 1106.)

Is there a good cause requirement for motions to compel interrogatory responses? No. Unlike requests for production, there is no good cause burden on the moving party. For interrogatories, the burden runs the other way: once the propounding party shows a response is deficient, the objecting party must justify the refusal. (Coy v. Superior Court (1962) 58 Cal.2d 210, 220–221.)

Conclusion

Mastering motions to compel interrogatory responses requires precision—citing the correct statute, meeting deadlines, satisfying procedural requirements, and articulating clear grounds for relief. The threshold question is whether a legally valid response was served: if not, move under § 2030.290 for responses without objections; if so but deficient, move under § 2030.300 within 45 days after thorough meet-and-confer.

The 45-day deadline for motions to compel further responses is jurisdictional and unforgiving. Miss it, and the right to challenge deficient answers is permanently lost. Calendar it immediately, obtain written extensions when needed, and file your motion before the deadline expires—even if meet-and-confer is ongoing.

Key Takeaways: The critical first step in any motion to compel interrogatories is identifying whether you need a motion to compel responses (no verified response served) or further responses (deficient response served)—this determines your statute, deadline, and procedural requirements. The 45-day deadline for motions to compel further responses is jurisdictional; failing to file in time permanently waives your right to compel. When in doubt, calendar the deadline conservatively, secure written extensions, and file your motion before time runs out.