What Is California Code of Civil Procedure § 431.30?

California Code of Civil Procedure Section 431.30 sets the rules for how a defendant must respond to the allegations in a civil complaint. It tells you when you can get away with a one-line general denial, when you have to deny each allegation specifically, and how to plead any affirmative defenses you want to raise. Get the format wrong and the court can treat the allegations you failed to deny as admitted, which is often the difference between a case you can fight and a case you’ve already lost on paper.¹

What Section 431.30 Covers

The statute governs the content of an answer. It defines two kinds of substantive material an answer can contain: denials of the complaint’s material allegations, and any new matter constituting a defense. Everything else in your answer, from the caption to the prayer, is dictated by other rules, but the guts of the pleading — what you’re contesting and why you’re not liable — comes out of 431.30.¹

The section also draws the line between complaints you can answer with a blanket denial and complaints that demand a paragraph-by-paragraph response. That line turns on one thing: whether the plaintiff verified the complaint under oath.

When You Can Use a General Denial

Under Section 431.30(d), a general denial is sufficient only if the complaint is unverified, or if the action is a limited civil case subject to California’s economic litigation procedures.¹ A general denial is one short statement that puts every material allegation in the complaint at issue. You don’t have to walk through the complaint paragraph by paragraph. Most California complaints are unverified, so this is the response you’ll see most often in day-to-day civil litigation.

One limit is worth knowing. A general denial only puts the complaint’s material allegations in issue. Procedural facts, like allegations about jurisdiction, aren’t typically treated as material in this context, so a general denial doesn’t automatically contest them. If you need to challenge those, you handle them separately.

When Specific Denials Are Required

If the plaintiff verified the complaint by signing it under oath, a general denial won’t do. The defendant has to deny the allegations of the complaint specifically, either positively or according to the defendant’s information and belief.¹ The answer to a verified complaint must itself be verified.²

This is where self-represented defendants get hurt most often. If you fire back a general denial at a verified complaint, or you file specific denials but forget to verify the answer, the allegations you failed to properly deny can be treated as admitted. Under Section 431.20, every material allegation of the complaint not controverted by the answer is taken as true.³ The plaintiff can then move for judgment on the pleadings, and the case is effectively over.

The Forms a Specific Denial Can Take

Section 431.30(f) gives defendants several ways to structure specific denials.¹ You can:

Deny particular paragraphs of the complaint by number, admitting the rest.
Admit certain allegations while generally denying the remaining ones.
Deny an allegation on the ground that you lack sufficient information or belief to answer it. That statement operates as a denial, and it is the honest choice when the complaint alleges facts you genuinely can’t confirm — the plaintiff’s internal records, medical history, or transactions you weren’t part of.

Picking which allegations to admit, deny, or deny on information and belief is a strategic exercise. Admitting genuinely undisputed facts, such as a contract date or the existence of a business relationship, narrows the issues for trial and keeps the answer credible. Denying everything reflexively, including facts nobody can seriously dispute, invites sanctions and signals to the court that the defense isn’t serious.

Affirmative Defenses Under Section 431.30

The statute also requires that any “new matter constituting a defense” be pleaded in the answer.¹ New matter is anything a defendant relies on to defeat the claim that goes beyond simply denying the plaintiff’s allegations. The classic framing is: even if what the plaintiff says is true, here is a legal reason I still shouldn’t be liable.

Each affirmative defense should be separately stated and tied to the specific cause of action it answers. If you don’t plead an affirmative defense in the answer, you generally waive the ability to raise it later. The California Courts’ self-help materials list several defenses that come up frequently in civil cases:⁴

Statute of limitations — the plaintiff waited too long to file.
Failure to state a cause of action — even accepting the complaint as true, the facts don’t add up to a valid claim.
Lack of standing — the plaintiff isn’t the party who was actually harmed.
Res judicata — the dispute has already been decided between the same parties.
Laches — unreasonable delay in filing prejudiced the defense.
Failure to mitigate damages — the plaintiff could have reduced their losses and didn’t.
Offset — the plaintiff owes the defendant money or hasn’t credited a payment already made.

Once new matter is pleaded, you don’t need the plaintiff to file anything in response to your defenses. The law treats the new matter as automatically denied by the plaintiff.³

What Happens If Your Answer Doesn’t Comply With 431.30

An answer that fails to meet the statute’s requirements is vulnerable in two ways. First, under Section 431.20, any material allegation you didn’t properly controvert stands as admitted for purposes of the case.³ This is the quiet, catastrophic result of getting the denial format wrong on a verified complaint.

Second, an answer that is legally improper can be struck under Section 436, which lets the court remove any part of a pleading that is irrelevant, false, or not drawn in conformity with California law.⁵ If the court strikes the entire answer and you don’t file a compliant one within the time allowed, the case can proceed as though you never responded at all.

Reading the Complaint Before You Answer

The practical takeaway from 431.30 is that the first question every defendant should ask is whether the complaint is verified. If it isn’t, a general denial paired with any affirmative defenses is usually sufficient. If it is, the answer has to walk through the allegations and address them individually, and the answer itself has to be verified. Everything else in an answer — how denials are worded, which defenses are raised, which paragraphs are admitted — flows from that first look at the complaint’s signature page.

1
California Legislative Information. California Code of Civil Procedure CCP 431.30
2
California Legislative Information. California Code of Civil Procedure CCP 446
3
California Legislative Information. California Code of Civil Procedure 431.20
4
California Courts | Self Help Guide. Using Affirmative Defenses If You’re Sued
5
California Legislative Information. California Code of Civil Procedure 436