ORDER GRANTING PLAINTIFFS’ MOTION TO STRIKE AFFIRMATIVE DEFENSES [DOC. 28] WITH LEAVE TO AMEND
THOMAS J. WHELAN, District Judge.Pending before the Court is Plaintiffs’ motion to strike Defendant’s affirmative defenses under Federal Rule of Civil Procedure 12(f). (Mot. [Doc. 28].) Defendants oppose. (Opp’n [Doc. 31].) The Court decides the matter on the papers submitted and without oral argument. See Civ. L.R. 7.1(d.l). For the reasons discussed below, the Court GRANTS Plaintiffs’ motion to strike [Doc. 28] with leave to amend selected affirmative defenses.
I. Background
On March 14, 2012, Plaintiffs filed suit against Defendants alleging violation of the Federal Debt Collection Practices Act, 15 U.S.C. § 1692, et seq. (the “FDCPA”), California Civil Code § 1788, et seq., and for negligence. Defendants filed separate answers, each including twenty identical affirmative defenses. (Answers [Docs. 16, 17].)
On February 19, 2013, Plaintiffs filed this motion to strike all twenty of Defendants’ affirmative defenses on the basis that “Defendants have attempted to allege defenses which are not actually defenses, Defendants have raised immaterial defenses, and that the defenses are not pled with sufficient particularity to provide Plaintiff[s] with ‘fair’ notice.” (Mot. 6:17-22.)
II. Legal Standards
A. Motion to Strike
Under Federal Rule of Civil Procedure 12(f), a court “may strike from a pleading an insufficient defense or any redundant, immaterial, impertinent, or scandalous matter.” “[T]he function of a 12(f) motion to strike is to avoid the expenditure of time and money that must arise from litigating spurious issues by dispensing with those issues prior to trial.” Sidney-Vinstein v. A.H. Robins Co., 697 F.2d 880, 885 (9th Cir.1983). At the same time, 12(f) motions are “generally regarded with disfavor because of the limited importance of pleading in federal practice, and because they are often used as a delaying tactic.” Neilson v. Union Bank of Cal., N.A., 290 F.Supp.2d 1101, 1152 (C.D.Cal.2003). Unless it would prejudice the opposing party, courts freely grant leave to amend stricken pleadings. Wyshak v. City Nat’l Bank, 607 F.2d 824, 826 (9th Cir.1979); see also Fed.R.Civ.P. 15(a)(2).
An affirmative defense may be insufficient as a matter of pleading or as a matter of law. Sec. People, Inc. v. Classic *489Woodworking, LLC, 2005 WL 645592, at *2 (N.D.Cal.2005). “The key to determining the sufficiency of pleading an affirmative defense is whether it gives the plaintiff fair notice of the defense.” Wyshak, 607 F.2d at 827 (citing Conley v. Gibson, 355 U.S. 41, 78 S.Ct. 99, 2 L.Ed.2d 80 (1957)) (emphasis added); Simmons v. Navajo, 609 F.3d 1011, 1023 (9th Cir.2010); Schutte & Koerting, Inc. v. Swett & Crawford, 298 Fed.Appx. 613, 615 (9th Cir.2008). Fair notice generally requires that the defendant state the nature and grounds for the affirmative defense. See Conley, 355 U.S. at 47, 78 S.Ct. 99. It does not, however, require a detailed statement of facts. Id. at 47-48, 78 S.Ct. 99. On the other hand, an affirmative defense is legally insufficient only if it clearly lacks merit “under any set of facts the defendant might allege.” McArdle v. AT & T Mobility, LLC, 657 F.Supp.2d 1140, 1149-50 (N.D.Cal.2009).
B. Pleading for Affirmative Defenses Before addressing the merits of Plaintiffs’ motion against each of Defendants’ affirmative defenses, the Court must resolve a preliminary issue raised by the parties. The question is whether the Court should extend the Supreme Court’s holdings in Bell Atlantic Corporation v. Twombly and Ashcroft v. Iqbal to evaluate the pleading sufficiency of Defendants’ affirmative defenses. See 556 U.S. 662, 129 S.Ct. 1937, 173 L.Ed.2d 868 (2009); 550 U.S. 544, 127 S.Ct. 1955, 167 L.Ed.2d 929 (2007).
As discussed above, the Ninth Circuit has directed courts to evaluate the pleading sufficiency of affirmative defenses under the “fair notice” standard. Wyshak, 607 F.2d at 827. In their motion, Plaintiffs contend that Defendants have alleged immaterial defenses and defenses which are not actually defenses, and failed to plead their defenses with sufficient particularity to provide Plaintiffs with fair notice. {Mot. 6:17-22.) Moreover, Plaintiffs contend that Defendants have not raised the defenses “beyond the speculative level.” {Id. 6:22-23.) Plaintiffs also suggest that the pleading standards established by the Supreme Court in Twombly and Iqbal apply. {See Id. at 3.) Although the Ninth Circuit has not yet adopted the Twombly/Iq-bal pleading standard for affirmative defenses, Plaintiffs cite to several district courts that have done so.1 {Id. at 7.) In response, Defendants rely on other district courts, including one within this district, that have declined to extend Twombly and Iqbal to affirmative defenses.2 {Opp’n 9.) Based on the case law, it is clear that this point of law is unresolved. See Barnes v. AT&T Pension Benefit Plan, 718 F.Supp.2d 1167, 1171 (N.D.Cal.2010) (“[Neither the Ninth Circuit or any other Circuit Courts of Appeals have extended Twombly’s heightened pleading standard to affirmative defenses.”).
Absent further direction, this Court declines to extend the Twombly/Iqbal pleading standards to affirmative defenses. Several considerations inform this conclusion. Most significantly, the Ninth Circuit has continued to recognize the “fair notice” standard of affirmative defense pleading even after Twombly and Iqbal. See Simmons, 609 F.3d at 1023; Schutte & Koerting, 298 Fed.Appx. at 615.
Moreover, the Supreme Court’s analysis in Twombly and Iqbal is itself limited to pleadings under Federal Rule of Civil Procedure 8(a)(2). 129 S.Ct. at 1950, 550 U.S. at 555, 127 S.Ct. 1955. Rule 8(a)(2) requires that the party stating a claim for relief provide “a short and plain statement of the claim showing that the pleader is entitled to relief.” Fed.R.Civ.P. 8(a)(2) (emphasis added). Rule 8(c), on the other hand, only requires a responding party to “affirmatively state ” its affirmative defenses. Fed.R.Civ.P. 8(c) (emphasis added). The Supreme Court’s discussion in Iqbal suggests that this distinction is important. See 129 S.Ct. at 1950. Factual plausibility — which is the key difference between Twombly/Iqbal pleading and “fair notice” pleading — is particularly suited to claim pleading because Rule 8(a)(2) re*490quires that the party “show[]” that it is entitled to relief. Id. (“But where the well-pleaded facts do not permit the court to infer more than mere possibility of misconduct, the complaint has alleged — but it has not ‘show[n]’ — ‘that the pleader is entitled to relief.’ ”) (quoting Fed.R.Civ.P. 8(a)(2)). Stating an affirmative defense under Rule 8(c), however, does not require the pleader to “show” entitlement to its defense.3 See Fed. R.Civ.P. 8(c). Applying the same standard of pleading to claims and affirmative defenses, despite this clear distinction in the rules’ language, would run counter to the Supreme Court’s warning in Twombly that legislative action, not “judicial interpretation,” is necessary to “broaden the scope” of specific federal pleading standards. See 550 U.S. at 569 n. 14, 127 S.Ct. 1955.
Finally, the Court is persuaded by the District of Colorado’s recognized distinction between the time plaintiff has to compose a complaint versus the time a defendant has to answer it. See Holdbrook v. SAIA Motor Freight Line, 2010 WL 865380, at *2. As the court explained, “it is reasonable to impose stricter pleading requirements on a plaintiff who has significantly more time to develop factual support for his claims than a defendant who is only given [21] days to respond to a complaint and assert its affirmative defenses.” Id.; see Fed.R.Civ.P. 12(a).
For these reasons, the Court will review the sufficiency of Defendants’ affirmative defenses under the “fair notice” pleading standard.
III. Discussion
A. First Affirmative Defense — Failure to State a Claim
In their first affirmative defense, Defendants allege that Plaintiffs’ Complaint “in whole, or in part, fails to state a claim upon which relief can be granted.” (Answers ¶ 70.) The Court agrees with Plaintiffs that this simple identification of one of Defendants’ defenses is insufficient to provide “fair notice.” See Wyshak, 607 F.2d at 827. Although Defendants’ pleading need not be supported by detailed factual allegations, it must at least give notice of the “grounds upon which it rests.” Conley, 355 U.S. at 47, 78 S.Ct. 99. Therefore, the Court STRIKES Defendants’ first affirmative defense WITH LEAVE TO AMEND.
B. Second Affirmative Defense — Statute of Limitations
In their second affirmative defense, Defendants allege that Plaintiffs’ claims are “barred by the applicable statute of limitations.” (Answer ¶ 71.) Again, the Court agrees with Plaintiffs that this statement alone is insufficient to provide fair notice. In Wyshak, the Ninth Circuit was confronted with a nearly identical pleading. 607 F.2d at 827 (“[P]laintiffs claims are barred by the applicable statute of limitations.”). In Wyshak, the court held that fair notice was provided because an attached memorandum identified the actual statute upon which the defense rested. Id. Here, Defendants make no mention of the applicable statute in its answer, and has attached no supplemental briefing on that point. (See Answer ¶ 71.) Accordingly, the Court STRIKES Defendants’ second affirmative defense WITH LEAVE TO AMEND.
C. Third, Fourth and Seventeenth Affirmative Defenses — Good Faith and Due Care
In their third affirmative defense, Defendants contend that “all of [their] ... actions were taken in good faith and with due care, and Defendants] did not directly engage in the alleged act, acts or omission(s) constituting the alleged violations or causes of action asserted by plaintiff.” (See Answer ¶ 72.) In their fourth affirmative defense, Defendants allege that they did not “engage in any conduct that was intentional, knowing, willfull [sic ], reckless, malicious, wanton or outrageous and Defendants acted in good faith at all times.” (See Answer ¶ 73.) In their seventeenth affirmative defense, Defendants contend that they “acted lawfully and within their legal rights, with a good faith belief in the exercise of their rights and in *491furtherance of a legitimate business purpose and such actions were justified and reasonable under circumstances based on the information available.” (See Answer ¶ 86.)
A good faith defense fails as a matter of law with regard to the alleged FDCPA violation because the FDCPA is essentially a strict liability statute. See Clark v. Capital Credit & Collection Servs., 460 F.3d 1162, 1175 (9th Cir.2006) (stating that the FDCPA does not require that a violation of § 1692e be knowing or intentional). Moreover, a good faith defense fails as a matter of law with regard to the negligence claim because a plaintiffs claim for negligence may stand irrespective of the defendant’s state of mind. See Restatement (Third) of Torts § 3 (2012).
However, good faith may be a viable defense to the alleged violation of the California Civil Code because § 1788.15(a) states that “[n]o debt collector shall collect or attempt to collect a consumer debt by means of judicial proceedings when the debt collector knows that service of process, where essential to jurisdiction over the debtor or his property, has not been legally effected.” Cal. Civ.Code § 1788.15(a) (West 2009). Furthermore, Section 1788.30(b) allows for liability for additional damages besides actual damages where a debt collector violates the statute “willfully and knowingly.” Cal. Civ. Code § 1788.30(b) (West 2007). Moreover, due care is a legally viable defense to a negligence claim. See Restatement (Third) of Torts § 3 (2012).
Nevertheless, the Court agrees with Plaintiffs that these statements alone are insufficient to provide fair notice. Defendants provide no basis for their claims. Therefore, the Court STRIKES Defendants’ third, fourth and seventeenth affirmative defenses WITH LEAVE TO AMEND.
D. Fifth, Sixth, Seventh, Eighth, and Ninth Affirmative Defense — Doctrines of Estoppel, Laches, Waiver, Res Judicata, & Collateral Estoppel
In their fifth, sixth, seventh, eighth, and ninth affirmative defenses, Defendants claim that Plaintiffs’ claims are barred by the doctrines of estoppel, laches, waiver, res judicata, and collateral estoppel. (See Answer ¶ 74-78.) Though these doctrines may be legally plausible, the Court agrees with Plaintiffs that these statements are insufficient to provide fair notice. Defendants provide no basis for these claims in their answers, and “a reference to a doctrine ... is insufficient notice.” Qarbon.com Inc. v. eHelp Corp., 315 F.Supp.2d 1046, 1049 (N.D.Cal.2004). Accordingly, the Court STRIKES Defendants’ fifth, sixth, seventh, eighth, and ninth affirmative defenses WITH LEAVE TO AMEND.
E. Tenth Affirmative Defense — Mitigation of Damages
In their tenth affirmative defense, Defendants allege that Plaintiffs “failed to mitigate [their] damages, if any were suffered.” (See Answer ¶ 79.) Defendants provide no basis for this claim in their answers. Additionally, this affirmative defense fails to give Plaintiffs any indication regarding the conduct supporting the defense. Accordingly, the Court STRIKES Defendants’ tenth affirmative defense WITH LEAVE TO AMEND.
F. Eleventh Affirmative Defense— Third-Party Responsibility
In their eleventh affirmative defense, Defendants contend that “Plaintiffs’] damages, if any, were caused by the actions or inactions of others whom these answering Defendants had no control.” (See Answer ¶ 80.) Defendants fail to give Plaintiffs any indication as to who the “others” referred to are, their relationship to them, or how they lacked control over them. Therefore, the Court STRIKES Defendants’ eleventh affirmative defense WITH LEAVE TO AMEND.
G. Twelfth and Thirteenth Affirmative Defenses — Bona Fide Mistake and Error
In their twelfth and thirteenth affirmative defenses, Defendants contend that “the alleged violations and/or causes of action asserted by [Plaintiffs] were or are the result of a bona fide mistake” and a “bona fide error”. (See Answer II81.) The FDCPA makes an exception for debt collectors “if the debt collector shows by a preponderance of *492evidence that the violation was not intentional and resulted from a bona fide error notwithstanding the maintenance of procedures reasonably adapted to avoid any such error.” 15 U.S.C. § 1692k(c). Thus, these may be legally plausible affirmative defenses. However, the Court finds that Defendants have not pled them with sufficient detail to give fair notice because they fail to specify the mistake(s) or error(s) they refer to or what, if any, “procedures reasonably adapted to avoid any such error [or mistake]” were maintained.
Plaintiffs rely on Bradshaw v. Hilco Receivables, LLC, 725 F.Supp.2d 532 (D.Md. 2010), for the proposition that Defendants are required to comply with Fed.R.Civ.P. 9(b) and plead the mistake defense “with particularity.” The Court need not rule on this matter, as Defendants’ pleadings have not sufficed to give Plaintiffs sufficient notice under the “fair notice” standard. Therefore, the Court STRIKES Defendants’ twelfth and thirteenth affirmative defenses WITH LEAVE TO AMEND.
H. Fourteenth Affirmative Defense— Contributory Negligence
In their fourteenth affirmative defense, Defendants allege that “Plaintiffs’] claims are diminished by the doctrine of contributory negligence.” {See Answer ¶ 83.) Defendants’ pleading fails to give Plaintiff any indication regarding the conduct supporting the defense. Thus, the Court STRIKES Defendants’ fourteenth affirmative defense WITH LEAVE TO AMEND.
I. Fifteenth Affirmative Defense — Protection Under First Amendment and Litigation Privilege
In their fifteenth affirmative defense, Defendants contend that “[t]he alleged violations and/or causes of action asserted are protected speech under the first amendment and protected under the litigation privilege including but not limited to California Civil Code § 47.” {See Answer ¶ 84.) Defendants provide no basis for these claims in their answers, and “a reference to a doctrine ... is insufficient notice.” Qarbon, 315 F.Supp.2d at 1049. Accordingly, the Court STRIKES Defendants’ fifteenth affirmative defense WITH LEAVE TO AMEND.
J. Sixteenth Affirmative Defense — Damages Limitations
In their sixteenth affirmative defense, Defendants allege that “if Plaintiff[s] [were] damaged in any sum or sums as alleged, which Defendant denies, then Plaintiffs’] damages are limited by 15 U.S.C. §§ 1692k(a)(1), 1692k(a)(2)(A), 1692k(a)(3) and 1692k(b)(l)” of the FDCPA. {See Answer ¶85.) This is not an affirmative defense. As a matter of law, Plaintiffs’ claim under the FDCPA is limited to the damages allowed by the statute. Defendants therefore need not plead this limitation in their answers. Accordingly, the Court STRIKES Defendants’ sixteenth affirmative defense WITHOUT LEAVE TO AMEND.
K. Eighteenth Defense — Non-Materiality of Alleged False Representations
In their eighteenth affirmative defense, Defendants claim that “if any false representations occurred, which is denied, that any false representations were nonmaterial and not actionable under the FDCPA.” {See Answer ¶ 87.) Under § 1692e, “a debt collector may not use any false, deceptive or misleading representation or means” to collect a debt. 15 U.S.C. § 1692e (West 1996). Defendants rely on Donohue v. Quick Collect, Inc., 592 F.3d 1027 (9th Cir.2010) for the proposition that “false but non-material misrepresentations are not likely to mislead the least sophisticated consumer and therefore are not actionable under §§ 1692e or 1692f.” {Reply 8:1-5.) The Court agrees with the Defendants that non-materiality may be a defense to FDCPA claims, but also agrees with the Plaintiffs that the defense is not pled with sufficient detail to give fair notice. Accordingly, the Court STRIKES Defendants’ eighteenth affirmative defense WITH LEAVE TO AMEND.
L. Nineteenth Affirmative Defense— Plaintiffs’ Bad Faith
In their nineteenth affirmative defense, Defendants allege that this suit “was brought in bad faith and is completely without merit.” {See Answer ¶ 88.) Defendants provide no basis for this claim in their answers. Accordingly, the Court STRIKES *493Defendants’ nineteenth affinnative defense WITH LEAVE TO AMEND.
M. Twentieth Affirmative Defense — Reservation of Right to Assert Additional Defenses
As their twentieth affirmative defense, Defendants “reserve[ ] the right to add additional affirmative defenses as may be discovered through future discovery.” (See Answer ¶ 89.) Plaintiffs argue that this is not a defense. The Court agrees. The mere “ ‘reservation of affirmative defenses’ is not an affirmative defense.” E.E.O.C. v. Timeless Investments, Inc., 734 F.Supp.2d 1035, 1055 (E.D.Cal.2010). Defendants may assert additional affirmative defenses later by amending their pleadings in compliance with Rule 15. See Fed.R.Civ.P. 15; U.S. v. Global Mortg. Funding, Inc., 2008 WL 5264986 at *5 (C.D.Cal.2008) (“[I]f a Defendant seeks to add affinnative defenses, it must comply with the procedure set out in Federal Rule of Civil Procedure 15.”); Timeless Investments, Inc., 734 F.Supp.2d at 1055 (“Rule 15 does not require a defendant to “expressly reserve” unnamed affirmative defenses in its answer.”). In short, Defendants “[are] either entitled to raise additional defenses at a later time or [ ] [are] not; [their] right to reserve [their] rights to do so is a legal nullity.” Global Mortg. Funding, Inc., 2008 WL 5264986 at *5. Therefore, the Court STRIKES Defendants’ twentieth affirmative defense WITHOUT LEAVE TO AMEND.
IV. Conclusion
For the previously stated reasons, the Court GRANTS Plaintiffs’ motion to strike [Doe. 28] and ORDERS as follows:
1. The Court STRIKES Defendants’ sixteenth and twentieth affirmative defenses WITHOUT LEAVE TO AMEND.
2. The Court STRIKES Defendants’ first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, twelfth, thirteenth, fourteenth, fifteenth, seventeenth, eighteenth, and nineteenth affirmative defenses WITH LEAVE TO AMEND.
3. Defendants must file their amended answer, if any, on or before July 10, 2013.
IT IS SO ORDERED.
. Plaintiffs cite Hayne v. Green Ford Sales, Inc., 263 F.R.D. 647, 650 (D.Kan.2009) for the proposition that district-courts from the Second, Fifth, Sixth, Seventh, Ninth, and Eleventh Circuits have concluded that the Twombly/Iqbal standard applies to affirmative defenses.
. See J & J Sports Prods., Inc. v. Scace, 2011 WL 2132723, at *1 (S.D.Cal.2011). Additionally, this Court recently declined to extend the Twom-bly/Iqbal standard to affirmative defenses. See Kohler v. Islands Restaurants, LP, 280 F.R.D. 560 (S.D.Cal.2012).
. Nor does pleading of non-affirmative defenses under Rule 8(b)(1) require any type of "showing.” See Fed.R.Civ.P. 8(b)(1). Rule 8(b)(1) only requires the responding party to "state in short and plain terms its defenses to each claim asserted against it.” Id.