OPINION OF THE COURT
Titone, J.
It is well established that a liability insurer has a duty to defend its insured in a pending lawsuit if the pleadings allege a covered occurrence, even though facts outside the four corners of those pleadings indicate that the claim may be meritless or not covered (see, e.g., Ruder & Finn v Seaboard Sur. Co., 52 NY2d 663, 669-670). The issue in this appeal is whether the insurer has a duty to defend in the opposite circumstance, i.e., where the pleadings do not allege a covered occurrence but the insurer has actual knowledge of facts demonstrating that the lawsuit does involve such an occurrence. Under these facts, we hold that the insurer cannot use a third party’s pleadings as a shield to avoid its contractual duty to defend its insured.
The plaintiff in the main action, Linda Fitzpatrick, sought recovery for the wrongful death of her husband, John Fitzpatrick, who died on October 31, 1985 while operating a three-wheel all-terrain vehicle. The complaint alleged that the vehicle in question was owned by defendant Frank Moramarco and that Moramarco had given Fitzpatrick permission to use it in connection with the performance of certain yardwork and household chores. According to the complaint, codefendant Cherrywood Property Owners Association (CPOA), the owner of the property on which the accident occurred, had retained Moramarco, and Moramarco, acting as CPOA’s agent, had in turn hired Fitzpatrick as an "independent contractor.”
In fact, Moramarco was an officer, shareholder and director of an independent concern called Cherrywood Landscaping, Inc. (CLI), which had been retained by CPOA to do landscaping work on CPOA’s property. The vehicle involved in Fitzpatrick’s accident had been purchased by Moramarco on behalf of CLI for use in its landscaping and gardening business. CLI had also purchased a liability insurance policy from National [64]*64Casualty Co. (National), which indemnified the corporation against having to pay damages for bodily injury and property damage arising out of its business. While the policy was not an "owner’s policy” and Moramarco was not a specifically named insured, the terms of the policy included as "insured persons” "any executive officer, director or stockholder [of the named insured (i.e., CLI)] while acting within the scope of his duties as such.”
Shortly after Moramarco was served with papers in the main action,1 he notified National and requested that the insurer provide him with a defense. National, however, refused, stating that the policy it had issued to CLI did not appear to cover the claim against Moramarco. In subsequent correspondence, Moramarco advised the insurer that the vehicle involved in the Fitzpatrick accident was "owned for and * * * used exclusively for landscaping operations” and that the claims asserted against him in the main action all arose out of activities he undertook for CLI, the named insured. The same circumstances were brought to the insurer’s attention in a letter from its own agent in which the company was urged to reconsider its prior decision. Nonetheless, National maintained that it was not required to provide a defense because the complaint did not name CLI, and Moramarco, the named defendant, was not insured as an individual.
Moramarco thereafter commenced a third-party action against National seeking payment of his legal fees in the main action, as well as "judgment over” for any judgment entered against him in the main action. National promptly moved, pursuant to CPLR 3211 (a) (1) and (7), to dismiss the third-party complaint. Relying wholly on the absence of allegations in the Fitzpatrick complaint suggesting that the claim against Moramarco arose in connection with his activities as an officer, shareholder or director of the insured CLI, National argued that it had no duty to defend or indemnify Moramarco under the terms of the policy. In response, Moramarco submitted proof to show that, despite the complaint’s inaccuracies, the Fitzpatrick claim actually did involve a covered event.
The Supreme Court denied National’s dismissal motion, holding that the question of whether its policy covered the [65]*65Fitzpatrick accident "must await a plenary trial.” The Appellate Division, however, reversed and dismissed the third-party complaint. The court held that the allegations in the complaint are the determinative factor in resolving whether the provisions of an insurance policy have been "activated” in a particular action. Since the Fitzpatrick complaint named Moramarco only in his individual capacity and the insured, CLI, was never even mentioned, the Appellate Division concluded that the existing documentary evidence, i.e., the Fitzpatrick complaint and the National policy, was sufficient to warrant dismissal of Moramarco’s third-party claim (see, CPLR 3211 [a] [1]). This Court granted Moramarco leave to appeal from the Appellate Division order. We now reverse.
This Court has repeatedly held that an insurer’s duty to defend its insured arises whenever the allegations in a complaint state a cause of action that gives rise to the reasonable possibility of recovery under the policy (see, e.g., Technicon Elecs. Corp. v American Home Assur. Co., 74 NY2d 66, 73; Meyers & Sons Corp. v Zurich Am. Ins. Group, 74 NY2d 298, 302; see, Servidone Constr. Corp. v Security Ins. Co., 64 NY2d 419, 424). In the present appeal, National asks this Court to hold that the converse is also true. According to National, the complaint allegations are, in all cases, the sole determining consideration and, consequently, an insurer is relieved of the duty to defend whenever the complaint allegations do not on their face set forth a covered cause of action. However, the position National advocates is neither compelled by our prior case law nor consistent with sound legal principles and policies. Accordingly, we reject it.
The rationale underlying the cases in which the "four corners of the complaint” rule was delineated and applied (see, e.g., Meyers & Sons Corp. v Zurich Am. Ins. Group, supra; International Paper Co. v Continental Cas. Co., 35 NY2d 322; Goldberg v Lumber Mut. Cas. Ins. Co., 297 NY 148), is based on the oft-stated principle that the duty to defend is broader than the duty to indemnify (see, e.g., Ruder & Finn v Seaboard Sur. Co., 52 NY2d 663, 669-670, supra). In other words, as the rule has developed, an insurer may be contractually bound to defend even though it may not ultimately be bound to pay, either because its insured is not factually or legally liable or because the occurrence is later proven to be outside the policy’s coverage.
It follows logically from this principle that an insurer’s duty [66]*66to defend is called into play whenever the pleadings allege an act or omission within the policy’s coverage. Even where there exist extrinsic facts suggesting that the claim may ultimately prove meritless or outside the policy’s coverage, the insurer cannot avoid its commitment to provide a defense, since "[a] complaint subject to defeat because of debatable theories * * * must [nevertheless] be defended by the insured.” (International Paper Co. v Continental Cas. Co., supra,
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OPINION OF THE COURT
Titone, J.
It is well established that a liability insurer has a duty to defend its insured in a pending lawsuit if the pleadings allege a covered occurrence, even though facts outside the four corners of those pleadings indicate that the claim may be meritless or not covered (see, e.g., Ruder & Finn v Seaboard Sur. Co., 52 NY2d 663, 669-670). The issue in this appeal is whether the insurer has a duty to defend in the opposite circumstance, i.e., where the pleadings do not allege a covered occurrence but the insurer has actual knowledge of facts demonstrating that the lawsuit does involve such an occurrence. Under these facts, we hold that the insurer cannot use a third party’s pleadings as a shield to avoid its contractual duty to defend its insured.
The plaintiff in the main action, Linda Fitzpatrick, sought recovery for the wrongful death of her husband, John Fitzpatrick, who died on October 31, 1985 while operating a three-wheel all-terrain vehicle. The complaint alleged that the vehicle in question was owned by defendant Frank Moramarco and that Moramarco had given Fitzpatrick permission to use it in connection with the performance of certain yardwork and household chores. According to the complaint, codefendant Cherrywood Property Owners Association (CPOA), the owner of the property on which the accident occurred, had retained Moramarco, and Moramarco, acting as CPOA’s agent, had in turn hired Fitzpatrick as an "independent contractor.”
In fact, Moramarco was an officer, shareholder and director of an independent concern called Cherrywood Landscaping, Inc. (CLI), which had been retained by CPOA to do landscaping work on CPOA’s property. The vehicle involved in Fitzpatrick’s accident had been purchased by Moramarco on behalf of CLI for use in its landscaping and gardening business. CLI had also purchased a liability insurance policy from National [64]*64Casualty Co. (National), which indemnified the corporation against having to pay damages for bodily injury and property damage arising out of its business. While the policy was not an "owner’s policy” and Moramarco was not a specifically named insured, the terms of the policy included as "insured persons” "any executive officer, director or stockholder [of the named insured (i.e., CLI)] while acting within the scope of his duties as such.”
Shortly after Moramarco was served with papers in the main action,1 he notified National and requested that the insurer provide him with a defense. National, however, refused, stating that the policy it had issued to CLI did not appear to cover the claim against Moramarco. In subsequent correspondence, Moramarco advised the insurer that the vehicle involved in the Fitzpatrick accident was "owned for and * * * used exclusively for landscaping operations” and that the claims asserted against him in the main action all arose out of activities he undertook for CLI, the named insured. The same circumstances were brought to the insurer’s attention in a letter from its own agent in which the company was urged to reconsider its prior decision. Nonetheless, National maintained that it was not required to provide a defense because the complaint did not name CLI, and Moramarco, the named defendant, was not insured as an individual.
Moramarco thereafter commenced a third-party action against National seeking payment of his legal fees in the main action, as well as "judgment over” for any judgment entered against him in the main action. National promptly moved, pursuant to CPLR 3211 (a) (1) and (7), to dismiss the third-party complaint. Relying wholly on the absence of allegations in the Fitzpatrick complaint suggesting that the claim against Moramarco arose in connection with his activities as an officer, shareholder or director of the insured CLI, National argued that it had no duty to defend or indemnify Moramarco under the terms of the policy. In response, Moramarco submitted proof to show that, despite the complaint’s inaccuracies, the Fitzpatrick claim actually did involve a covered event.
The Supreme Court denied National’s dismissal motion, holding that the question of whether its policy covered the [65]*65Fitzpatrick accident "must await a plenary trial.” The Appellate Division, however, reversed and dismissed the third-party complaint. The court held that the allegations in the complaint are the determinative factor in resolving whether the provisions of an insurance policy have been "activated” in a particular action. Since the Fitzpatrick complaint named Moramarco only in his individual capacity and the insured, CLI, was never even mentioned, the Appellate Division concluded that the existing documentary evidence, i.e., the Fitzpatrick complaint and the National policy, was sufficient to warrant dismissal of Moramarco’s third-party claim (see, CPLR 3211 [a] [1]). This Court granted Moramarco leave to appeal from the Appellate Division order. We now reverse.
This Court has repeatedly held that an insurer’s duty to defend its insured arises whenever the allegations in a complaint state a cause of action that gives rise to the reasonable possibility of recovery under the policy (see, e.g., Technicon Elecs. Corp. v American Home Assur. Co., 74 NY2d 66, 73; Meyers & Sons Corp. v Zurich Am. Ins. Group, 74 NY2d 298, 302; see, Servidone Constr. Corp. v Security Ins. Co., 64 NY2d 419, 424). In the present appeal, National asks this Court to hold that the converse is also true. According to National, the complaint allegations are, in all cases, the sole determining consideration and, consequently, an insurer is relieved of the duty to defend whenever the complaint allegations do not on their face set forth a covered cause of action. However, the position National advocates is neither compelled by our prior case law nor consistent with sound legal principles and policies. Accordingly, we reject it.
The rationale underlying the cases in which the "four corners of the complaint” rule was delineated and applied (see, e.g., Meyers & Sons Corp. v Zurich Am. Ins. Group, supra; International Paper Co. v Continental Cas. Co., 35 NY2d 322; Goldberg v Lumber Mut. Cas. Ins. Co., 297 NY 148), is based on the oft-stated principle that the duty to defend is broader than the duty to indemnify (see, e.g., Ruder & Finn v Seaboard Sur. Co., 52 NY2d 663, 669-670, supra). In other words, as the rule has developed, an insurer may be contractually bound to defend even though it may not ultimately be bound to pay, either because its insured is not factually or legally liable or because the occurrence is later proven to be outside the policy’s coverage.
It follows logically from this principle that an insurer’s duty [66]*66to defend is called into play whenever the pleadings allege an act or omission within the policy’s coverage. Even where there exist extrinsic facts suggesting that the claim may ultimately prove meritless or outside the policy’s coverage, the insurer cannot avoid its commitment to provide a defense, since "[a] complaint subject to defeat because of debatable theories * * * must [nevertheless] be defended by the insured.” (International Paper Co. v Continental Cas. Co., supra, at 326.) Accordingly, the courts of this State have refused to permit insurers to look beyond the complaint’s allegations to avoid their obligation to defend and have held that the duty to defend exists "[i]f the complaint contains any facts or allegations which bring the claim even potentially within the protection purchased” (Technicon Elecs. Corp. v American Home Assur. Co., supra, at 73). The holdings thus clearly establish that an insurer’s duty to defend is at least broad enough to apply when the "four corners of the complaint” suggest the reasonable possibility of coverage.
However, to say that the duty to defend is at least broad enough to apply to actions in which the complaint alleges a covered occurrence is a far cry from saying that the complaint allegations are the sole criteria for measuring the scope of that duty. Indeed, in these circumstances, where the insurer is attempting to shield itself from the responsibility to defend despite its actual knowledge that the lawsuit involves a covered event, wooden application of the "four corners of the complaint” rule would render the duty to defend narrower than the duty to indemnify — clearly an unacceptable result. For that reason, courts and commentators have indicated that the insurer must provide a defense if it has knowledge of facts which potentially bring the claim within the policy’s indemnity coverage (see, e.g., Lowenstein Dyes & Cosmetics v Aetna Life & Cos. Co., 524 F Supp 574, 576, affd 742 F2d 1437; Tennessee Corp. v Hartford Acc. & Indem. Co., 326 F Supp 520, 524, affd 463 F2d 548; Evan v Employers Mut. Liab. Ins. Co., 391 F Supp 1230, 1231-1232; National Indem. Co. v Flesher, 469 P2d 360, 366 [Alaska]; Fresno Economy Import Used Cars v United States Fid. & Guar. Co., 76 Cal App 3d 272, 278-279, 142 Cal Rptr 681; Mullen v Glens Falls Ins. Co., 73 Cal App 3d 163, 169-170, 140 Cal Rptr 605; Loftin v United States Fire Ins. Co., 106 Ga App 287, 127 SE2d 53; LaRotunda v Royal Globe Ins. Co., 87 Ill App 3d 446, 408 NE2d 928; New Hampshire Ins. Co. v Christy, 200 NW2d 834, 838-839 [Iowa]; Patrons Mut. Ins. Assn. v Harmon, 240 Kan 707, 732 P2d 741; Shepard [67]*67Mar. Constr. Co. v Maryland Cas. Co., 73 Mich App 62, 250 NW2d 541; Lanoue v Fireman’s Fund Am. Ins. Cos., 278 NW2d 49, 53 [Minn]; Iowa Natl. Mut. Ins. Co. v Universal Underwriters Ins. Co., 276 Minn 362, 150 NW2d 233; Marshall’s U.S. Auto Supply v Maryland Cas. Co., 354 Mo 455, 189 SW2d 529; Commercial Pipe & Supply Corp. v Allstate Ins. Co., 36 AD2d 412, affd 30 NY2d 619; Sucrest Corp. v Fisher Governor Co., 83 Misc 2d 394, 402-403; Ostrager & Newman, Insurance Coverage Disputes § 5.02 [a], at 122-123 [3d ed]; 7C Appleman, Insurance Law and Practice § 4683, at 56 [Berdal ed]; id., § 4684.01, at 96-97; at 17 [1990 Pocket Part]; but see, Sussman v American Sur. Co., 345 F2d 679; Massachusetts Turnpike Auth. v Perini Corp., 349 Mass 448, 208 NE2d 807; Allstate Ins. Co. v Coriell, 30 Ohio Misc 67, 284 NE2d 202 [criticized in 7C Appleman, op. cit., § 4684.01, at 92, n 13]).
We agree with these authorities and hold that, rather than mechanically applying only the "four corners of the complaint” rule in these circumstances, the sounder approach is to require the insurer to provide a defense when it has actual knowledge of facts establishing a reasonable possibility of coverage (see generally, 7C Appleman, op. cit., § 4684.01, at 95).2 This holding fits easily and appropriately within the existing rules governing coverage disputes (see, Commercial Pipe & Supply Corp. v Allstate Ins. Co., supra; Sucrest Corp. v Fisher Governor Co., supra), which certainly do not require us to extend the "four corners of the complaint” rule to a [68]*68situation such as this one, where it has not been applied before and, in fact, has no apparent value. Although it has been argued that the "four corners of the complaint” rule has the advantage of certainty (see, dissenting opn, at 73), there is no reason to believe that the rule we adopt here will engender any more litigation.
The conclusion we reach here flows naturally from the fact that the duty to defend derives, in the first instance, not from the complaint drafted by a third party, but rather from the insurer’s own contract with the insured (see, e.g., 7C Appleman, op. cit., § 4682, at 27 [and authorities cited therein]). While the allegations in the complaint may provide the significant and usual touchstone for determining whether the insurer is contractually bound to provide a defense, the contract itself must always remain a primary point of reference (see also, Technicon Elecs. Corp. v American Home Assur. Co., supra, at 73 [duty to defend arises from complaint and insurance contract]). Indeed, a contrary rule making the terms of the complaint controlling "would allow the insurer to construct a formal fortress of the third party’s pleadings * * * thereby successfully ignoring true but unpleaded facts within its knowledge that require it * * * to conduct the * * * insured’s defense” (Associated Indem. Co. v Insurance Co., 68 Ill App 3d 807, 816-817, 386 NE2d 529, 536). Further, an insured’s right to a defense should not depend solely on the allegations a third party chooses to put in the complaint. This is particularly so because the drafter of the pleading may be unaware of the true underlying facts or the nuances that may affect the defendant’s coverage and it might not be in the insured’s (or the insurer’s) interest to reveal them.3
The principle that an insurer may not rely on the pleadings to narrow the scope of its duty to defend also finds support in the practical realities that prevail under modern pleading rules. As one commentator has observed, "considering the plasticity of modern pleadings, in many cases no one can determine whether the third party suit does or does not fall within the indemnification coverage of the policy until the [69]*69suit itself is resolved” (7C Appleman, op. cit., § 4684, at 83). This observation is particularly apt in the context of New York’s liberal pleading rules, which permit the pleadings to be amended to conform to the proof at any time, provided that no prejudice is shown (see, CPLR 3025 [a]).
The facts in this case — where the complaint on its face did not state a covered claim but the underlying facts made known to the insurer by its insured unquestionably involved a covered event — present a clear example. The insurer here refused to defend Frank Moramarco because he was sued, albeit mistakenly, as an employee of CPOA and the owner of the injury-causing vehicle. Had the complaint correctly identified Moramarco as an officer and/or shareholder of the insured CLI, he would have unquestionably been covered for this lawsuit, since the policy provided that "any executive officer, director or stockholder [of CLI] while acting within the scope of his duties as such” was an additional "insured person” under the policy. Further, the insurer promised to "defend any suit against the insured seeking damages on account of * * * bodily injury or property damage” arising out of CLI’s landscaping and gardening business — a condition plainly satisfied here. To deny Moramarco an insurance-company sponsored defense under these circumstances merely because the attorney for the plaintiff in the main action accidentally mischaracterized Moramarco’s role would be to afford the insurer an undeserved windfall at the expense of its insured.
Indeed, relieving the insurer of its duty to defend is particularly imprudent and counterproductive where, as here, the inaccuracies in the plaintiff’s pleadings are likely to become apparent when the true facts are developed on the record and the role of the insured in the incident is fully exposed.4 At [70]*70that point, the trial court could well grant a request by the plaintiff to conform the pleadings to the proof (see, CPLR 3025 [c]), in which event the insurer’s core policy obligation to defend Frank Moramarco as an additional insured would unquestionably be triggered. Moramarco should not be required to wait until that point is reached before obtaining an insurance-company sponsored defense, since a "provision for defense of suits is useless and meaningless unless it is offered when the suit arises” (7C Appleman, op. cit., § 4684, at 83).
In sum, application of the "four corners of the complaint” rule in these circumstances is not required by our prior cases and is not even supported by the rationale usually offered in support of the rule. Further, invocation of the rule here and in analogous cases leads to an unjust result, since it exalts form over substance and denies an insured party the benefit of the "litigation insurance” for which it has paid. These factors militate in favor of a rule requiring the insurer to provide a defense where, notwithstanding the complaint allegations, underlying facts made known to the insurer create a "reasonable possibility that the insured may be held liable for some act or omission covered by the policy” (Meyers & Sons Corp. v Zurich Am. Ins. Group, supra, at 302). We therefore hold that National cannot ignore the facts made known to it by its insured and rely instead on the Fitzpatrick complaint alone to assess its duty to defend Moramarco. The third-party complaint by Moramarco seeking payment of his attorney’s fees and indemnification in the event that a judgment was entered against him should not have been dismissed.5
Accordingly, the order of the Appellate Division should be reversed, with costs, and the motion to dismiss the third-party complaint denied.