Plaintiff’s Answer to Counterclaim: Deadline, Defenses, and Filing

A plaintiff’s answer to a counterclaim is the formal pleading you file to respond, paragraph by paragraph, to the claims a defendant has asserted back against you. In federal court, you have 21 days from service of the counterclaim to file it.¹ Miss the deadline, skip an allegation, or leave out a jurisdictional defense, and the consequences stick. This walks through the federal rules; most state courts follow a similar framework but set their own clocks.

The 21-Day Deadline and What Missing It Costs

The clock starts on the date you are served with the pleading containing the counterclaim, not the date you read it.¹ State deadlines commonly run 20 to 30 days, so check local rules.

If you file a Rule 12 motion before answering, the deadline shifts. Once the court denies the motion or defers ruling until trial, you have 14 days from notice of that decision to serve your answer.¹

If you let the deadline pass without filing anything, the defendant can ask the clerk to enter default under Rule 55 and then move for a default judgment on the counterclaim. Rule 55 applies to plaintiffs facing counterclaims the same way it applies to defendants who ignore a complaint.² A default judgment means you lose on the counterclaim without presenting your side. Setting one aside is possible but difficult, and the burden is entirely on you.

How To Title and Structure the Document

Federal Rule of Civil Procedure 7(a) formally calls this pleading an “answer to a counterclaim designated as a counterclaim.”³ Title it precisely, usually “Plaintiff’s Answer to Defendant’s Counterclaim.” The caption needs the court’s name, the case file number, and the names of the parties.⁴

The body uses numbered paragraphs that track the numbered allegations in the counterclaim. If the counterclaim has 15 paragraphs, your answer has 15 corresponding responses in the same order. That one-to-one structure lets the court see at a glance what is disputed.

Rule 7(a) does not allow a “counterclaim to a counterclaim.” You cannot embed new affirmative claims in this document. If you want to add claims beyond your original complaint, that is a separate motion to amend under Rule 15.³

Responding to Each Allegation

For every numbered paragraph, you have three choices under Rule 8: admit it, deny it, or state that you lack knowledge or information sufficient to form a belief about it. Each allegation must be addressed individually.⁵

Admit What Is True

Admit facts that are genuinely accurate. Admission is not a concession of liability; it narrows the dispute. If the counterclaim correctly alleges you signed a contract on a specific date, admit it. Fighting indisputable facts wastes credibility with the judge and can draw sanctions.

Deny the Rest

A denial has to address the substance of the allegation. When part of a paragraph is accurate and part is not, admit the accurate portion and deny the rest.⁵ A blanket general denial of the entire counterclaim is permitted only when you genuinely intend to deny every allegation, including jurisdictional ones. In practice courts view general denials skeptically, and a bad-faith general denial can trigger Rule 11 sanctions.

Plead Lack of Knowledge When That Is Honest

When you genuinely do not have enough information to confirm or refute an allegation, say so. That response functions as a denial and puts the burden on the defendant to prove the point at trial.⁵ Do not use it as a dodge for inconvenient facts you clearly know. Courts can see through it.

Silence Equals Admission

This is where plaintiffs lose cases they should have won. Any allegation you fail to address is automatically deemed admitted, with the single exception of allegations about the amount of damages.⁵ If the counterclaim has 20 paragraphs and your answer responds to 15, the five you skipped are treated as true. There is no second chance. Before filing, go through the counterclaim once more and confirm every paragraph has a matching response.

Affirmative Defenses

After the paragraph-by-paragraph responses, you plead affirmative defenses. An affirmative defense is a reason the defendant cannot win even if every allegation in the counterclaim turned out to be true. Rule 8(c)(1) requires you to state these in your answer or you risk waiving them.⁵

The rule enumerates the usual candidates: statute of limitations, estoppel, waiver, release, fraud, duress, payment, laches, and discharge in bankruptcy, among others, and closes with a catchall for “any other matter constituting an avoidance or affirmative defense.” A few that come up often:

Statute of limitations, if the defendant waited past the applicable period to bring the counterclaim.
Estoppel, if the defendant previously represented something that contradicts the counterclaim and you relied on it to your detriment.
Waiver, if the defendant gave up the right being asserted through prior conduct or agreement.
Laches, if unreasonable delay in bringing the claim has prejudiced you, even where the limitations period has not yet expired.

A single concise paragraph per defense is usually enough at the pleading stage. The defendant can move under Rule 12(f) to strike a defense that is insufficient, redundant, or irrelevant.¹ That is a much better problem to have than discovering mid-trial that you omitted a defense and waived it. When in doubt, plead it. If you mislabel an affirmative defense as a counterclaim or the reverse, the court may treat it as properly designated when justice requires.⁵

Rule 12 Defenses You Will Lose If You Skip Them

Rule 12(b) defenses attack whether the counterclaim belongs in this court or states a viable claim. You can raise them in a pre-answer motion or in the answer itself. Some are forgiving; others disappear forever the moment you file an answer without them.

Subject Matter Jurisdiction

Federal courts need either a federal question or diversity jurisdiction. Diversity requires an amount in controversy over $75,000 and parties who are citizens of different states.⁶ A permissive counterclaim (one that does not arise from the same transaction as your complaint) needs its own independent jurisdictional basis, so a sub-$75,000 permissive counterclaim between citizens of the same state is vulnerable to a Rule 12(b)(1) challenge. Subject matter jurisdiction is never waived and can be raised at any time, even on appeal.¹

Personal Jurisdiction, Venue, and Service

Rule 12(b)(2) covers lack of personal jurisdiction, 12(b)(3) covers improper venue, and 12(b)(4) and (5) cover defects in the process and in service of process. Under Rule 12(h)(1), these four are permanently waived if you do not raise them in either a pre-answer motion or in the answer itself. File an answer without them and they are gone. You cannot resurrect them in a later motion or at trial.¹ Preserving one costs a paragraph. Losing one costs the argument.

Failure to State a Claim

Rule 12(b)(6) says that even taking every allegation as true, the defendant has not described a legally recognized claim. This defense goes to the merits and can dismiss the counterclaim before discovery. Unlike the personal-jurisdiction group, 12(b)(6) and failure to join a required party can be raised later in a motion for judgment on the pleadings or at trial.¹

The practical rule when drafting: include every jurisdictional and procedural defense you might conceivably have.

Request for Relief and Signature

Close with a “wherefore” clause stating what you want the court to do. Typical requests include dismissal of the counterclaim with prejudice, attorney’s fees and costs, and any other relief the court deems appropriate. If the counterclaim alleges monetary harm, you can request a judgment declaring you owe nothing. Equitable relief like an injunction is available where the counterclaim threatens ongoing harm money cannot repair. Keep the relief aligned with the defenses you actually pleaded.

Every pleading must be signed by an attorney of record, or by the party personally if unrepresented, with the signer’s address, email, and telephone number. Courts will strike an unsigned pleading unless the omission is promptly fixed. By signing, you certify that your factual denials are supported by evidence or, where specifically identified, are reasonably based on belief or lack of information.⁷ Frivolous denials or denials made without reasonable inquiry can draw sanctions, including monetary penalties or an order to pay the defendant’s fees caused by the violation. The standard is reasonable investigation before you deny.

Filing and Service

Most federal courts require electronic filing. Filing through the court’s system handles service on parties registered for electronic notification, and no separate certificate of service is required for them.⁸ For any other method of service, file a certificate of service with the document or within a reasonable time afterward. Confirm local rules on page limits, font, and margins before filing; courts reject noncompliant submissions.

Fixing an Answer After You File

If you catch a missed defense or an error, Rule 15 lets you amend once as a matter of course within 21 days after serving the answer, provided no responsive pleading to the answer is required.⁹ After that window, you need the other side’s written consent or leave of court. Courts grant leave freely when justice requires, but adding defenses that should have been obvious from the start weakens the request. Getting it right the first time is the goal.

1
Cornell Law School. Federal Rules of Civil Procedure Rule 12 – Defenses and Objections
2
Office of the Law Revision Counsel. Federal Rules of Civil Procedure Rule 55 – Default; Default Judgment
3
LII / Legal Information Institute. Federal Rules of Civil Procedure Rule 7 – Pleadings Allowed; Form of Motions and Other Papers
4
Cornell Law Institute. Federal Rules of Civil Procedure Rule 10 – Form of Pleadings
5
Legal Information Institute. Federal Rules of Civil Procedure Rule 8 – General Rules of Pleading
6
Office of the Law Revision Counsel. 28 USC 1332 – Diversity of Citizenship; Amount in Controversy; Costs
7
Cornell Law School – Legal Information Institute (LII). Federal Rules of Civil Procedure Rule 11 – Signing Pleadings, Motions, and Other Papers
8
LII at Cornell Law School. Federal Rules of Civil Procedure Rule 5 – Serving and Filing Pleadings and Other Papers
9
Cornell Law School. Federal Rules of Civil Procedure Rule 15 – Amended and Supplemental Pleadings