The Transactional Approach to Res Judicata: New York Courts Continue to Enforce Finality

By: Jeffrey M. Haber

Res judicata, or claim preclusion, is grounded in the principle that disputes, once fully and fairly adjudicated, should not be relitigated. The doctrine serves the important goals of finality, judicial economy, and consistency by preventing parties from pursuing successive lawsuits arising from the same underlying transaction or occurrence. New York courts therefore apply a broad transactional approach to claim preclusion, barring not only claims that were actually litigated in a prior action, but also those that could have been raised in that action. The doctrine extends to parties and those in privity with them, including successors-in-interest whose rights derive from a party to the earlier litigation. As the Second Department recently reaffirmed in Rosio v. MTGLQ Invs., L.P., 2026 N.Y. Slip Op. 04782 (2d Dept. July 27, 2026), where a successor mortgage holder was in privity with the plaintiff in a prior foreclosure action, a borrower could not evade the preclusive effect of a judgment of foreclosure by repackaging previously litigable issues as a later General Business Law § 349 claim. Because the judgment of foreclosure conclusively resolved, or could have resolved, issues relating to the mortgagee’s standing and authority to negotiate and service the loan, and because the subsequent claim would impair rights established by the judgment of foreclosure, the action was barred by res judicata.

Applicable Principles

“Under the doctrine of res judicata, a final adjudication of a claim on the merits precludes relitigation of that claim and all claims arising out of the same transaction or series of transactions by a party or those in privity with a party.”[1] “The doctrine of res judicata bars a party from relitigating any claim which could have been or should have been litigated in a prior proceeding.”[2] Thus, “[a] judgment of foreclosure and sale is final as to all questions at issue between the parties, and concludes all matters of defense which were or could have been litigated in the foreclosure action.”[3] 

“Moreover, [a] judgment by default that has not been vacated is conclusive for res judicata purposes and encompasses the issues that were raised or could have been raised in the prior action.”[4] “[A] defendant who fails to assert a counterclaim is not barred by the doctrine of res judicata from subsequently commencing a new action on that claim unless the claim would impair the rights or interests established in the first action.”[5] 

Rosio v. MTGLQ Invs., L.P.

In 2015, Nationstar Mortgage, LLC (“Nationstar”), commenced an action to foreclose a mortgage (the “2015 foreclosure action”) against, among others, the plaintiff in the action. Plaintiff failed to answer. In an order dated October 17, 2016, the Supreme Court, inter alia, granted Nationstar’s unopposed motion for leave to enter a default judgment and for an order of reference. In an order and judgment of foreclosure and sale dated February 24, 2020, the court, among other things, substituted MTGLQ Investors, L.P. (“MTGLQ”), as the plaintiff in the 2015 foreclosure action, confirmed the referee’s report, and granted a judgment of foreclosure and sale in favor of MTGLQ.

On December 11, 2023, plaintiff commenced the action against MTGLQ, inter alia, to recover damages for deceptive practices in violation of General Business Law § 349. Plaintiff alleged, among other things, that MTGLQ did not obtain valid possession of the note and consequently lacked standing to foreclose the mortgage. Plaintiff, thus, alleged that MTGLQ’s actions taken in furtherance of the foreclosure amounted to a deceptive practice in violation of General Business Law § 349.

MTGLQ moved pursuant to CPLR 3211(a) to dismiss the complaint on the ground, inter alia, that the action was barred by res judicata. In an order dated November 4, 2024, the Supreme Court granted MTGLQ’s motion. Plaintiff appealed from so much of the order as dismissed the third cause of action, alleging violation of General Business Law § 349, as barred by the doctrine of res judicata, pursuant to CPLR 3211(a)(5).

The Second Department affirmed.

The Court first held that MTGLQ, as Nationstar’s successor-in-interest, was in privity with Nationstar and therefore entitled to invoke the preclusive effect of the prior judgment of foreclosure.[6] “As such,” said the Court, “the judgment of foreclosure and sale encompassed all issues that were raised or could have been raised in the foreclosure action, including whether MTGLQ had standing to foreclose on the mortgage, to engage in loan modification reviews with [plaintiff], or to negotiate with him.”[7] “Consequently,” the Court concluded that plaintiff was “precluded from asserting a cause of action alleging violation of General Business Law § 349 that [was] predicated on those same issues.”[8]

Finally, the Court held that permitting the claim to proceed would impair rights established by the judgment of foreclosure.[9] Because success on plaintiff’s GBL § 349 claim would undermine determinations embodied in the prior foreclosure action, the claim was independently barred under the principles of res judicata.[10]

Takeaway

The Second Department’s decision in Rosio highlights the scope of the res judicata doctrine. The Court reaffirmed that once an action results in a final judgment, the parties are bound not only by issues actually litigated, but also by issues that could have been litigated in that action. Litigants cannot avoid the preclusive effect of a judgment by repackaging previously available challenges under a different legal theory in a subsequent lawsuit.

The decision is also a significant reminder that res judicata extends beyond the original parties to those in privity with them. Because MTGLQ was Nationstar’s successor-in-interest, the Court found that it stood in Nationstar’s shoes for purposes of claim preclusion. As a result, any issues that could have been raised against Nationstar in the foreclosure action were equally barred when asserted against MTGLQ.

The Court further emphasized the finality afforded to judgments. By holding that the judgment of foreclosure encompassed questions concerning the mortgage holder’s standing, authority to conduct loan-modification reviews, and right to negotiate with the borrower, the Court reinforced the principle that defenses and claims relating to the validity or enforcement of the mortgage must ordinarily be raised in the foreclosure action itself. Failure to do so generally forecloses later attempts to challenge those matters.

Equally important, Rosio demonstrates that a plaintiff cannot evade the application of the res judicata doctrine merely by recasting a dispute under a different legal theory – in Rosio, as a statutory consumer-protection claim under General Business Law § 349. The Court looked beyond the label attached to the cause of action and focused on the underlying conduct and issues upon which the claim was based. Because the alleged deceptive practices depended on the same issues that either were or could have been litigated in the foreclosure action, the claim was barred notwithstanding its different legal theory.

Finally, Rosio highlights an important limitation on New York’s rule that unasserted counterclaims are not automatically precluded. Although defendants are generally not required to bring all counterclaims in a prior action, a later claim will nevertheless be barred where success on that claim would impair rights established by the earlier judgment. The Court concluded that permitting the claim to proceed would impair rights established by the judgment in the foreclosure action. Because the claim was predicated on issues that were resolved, or could have been resolved, in the prior proceeding, a judgment in plaintiff’s favor would undermine the finality of the judgment of foreclosure. In so holding, the Court reaffirmed the principle that a party may not circumvent the preclusive effect of a final judgment by repackaging previously litigated claims or issues in a subsequent action.

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Jeffrey M. Haber is a partner and co-founder of Freiberger Haber LLP.

This article is for informational purposes only and is not intended to be, and should not be, taken as legal advice.

Unless otherwise stated, Freiberger Haber LLP’s articles are based on recently decided published opinions or litigation releases and not on matters handled by the firm. ___________________________________

[1] Ciraldo v. JP Morgan Chase Bank, N.A., 140 A.D.3d 912, 913 (2d Dept. 2016); see Gramatan Home Invs. Corp. v. Lopez, 46 N.Y.2d 481, 486-487 (1979); Harrison DGR44, LLC v. Luiso 44 Harrison, LLC, 219 A.D.3d 1413, 1414 (2d Dept. 2023).

[2] Montoute v. Wells Fargo Bank, N.A., 208 A.D.3d 474, 475 (2d Dept. 2022) (internal quotation marks omitted); see Sheodial v. U.S. Bank N.A., 218 A.D.3d 511, 512 (2d Dept. 2023).

[3] Sheodial, 218 A.D.3d at 512 (internal quotation marks omitted); see Eaddy v. US Bank N.A., 180 A.D.3d 756, 758 (2d Dept. 2020).

[4] Id. (internal quotation marks omitted); see Eaddy, 180 A.D.3d at 758.

[5] Wax v. 716 Realty, LLC, 151 A.D.3d 902, 904 (2d Dept. 2017); see Schuylkill Fuel Corp. v. Nieberg Realty Corp., 250 N.Y. 304, 306-308; Sweet Constructors, LLC v. Wallkill Med. Dev., LLC, 106 A.D.3d 810, 811 (2d Dept. 2013).

[6] Slip Op. at *2, citing Gramatan, 46 N.Y.2d at 486-487; Harrison DGR44, 219 A.D3d at 1414; Ciraldo, 140 A.D.3d at 913.

[7] Id., citing Sheodial, 218 A.D.3d at 512; Montoute, 208 A.D.3d at 475; Eaddy, 180 A.D.3d at 758.

[8] Id., citing Sheodial, 218 A.D.3d at 512; Montoute, 208 A.D.3d at 475.

[9] Id.

[10] Id., citing Schuylkill, 250 N.Y. at 306-308; Wax, 151 A.D.3d at 904; Sweet Constructors, 106 A.D.3d at 811.