공동저당 부동산의 제3취득자들이 공동공탁한 경우 변제자대위 비율 -대상판결: 대법원 2024. 7. 31. 선고 2023다266420 판결-

Under the Korean Civil Code, where multiple security providers are involved in the same obligation, each provider's proportionate share of liability is determined, and subrogation by the payer is recognized only within that scope. Accordingly, subrogation by the payer serves not merely to preserve the payer's own contribution but also to distribute the debtor's insolvency risk equitably among security providers. However, due to the regulatory ambiguity inherent in the provisions that establish these proportionate shares of liability, ongoing scholarly debate has centered on interpretive theories regarding their specific application. The subject judgment (Supreme Court Decision 2023Da266420, July 31, 2024) concerns the ratio of subrogation by the payer among multiple third-party acquirers of mortgaged real estate who have jointly deposited the performance of the debtor's obligation. This paper uses commentary on the decision as a starting point to examine prior interpretive theories related to the relevant provisions, identify limitations in current legal doctrine, and explore avenues for improvement. First, although not the main issue in the case, the courts have consistently maintained that when a joint deposit is made without specifying ownership shares, shares are presumed to be equal based on outward appearance. However, consideration should be given to improving deposit practices to allow for specification of individual shares to prevent unnecessary disputes and promote litigation economy. The primary issue in this case concerns the ratio of subrogation by the payer among third-party acquirers. The lower court held that Article 482(2)(3) of the Civil Code, which provides for subrogation in proportion to the value of real estate, applies only when the third-party acquirer's property is “auctioned”, and thus in this case, subrogation by the payer should arise according to the “ratio of deposit”. However, the ratio of deposit is a legal principle to be considered when determining the amount of payment that gives rise to subrogation by the payer, and from the perspective of “method of performance”, there is no essential difference between “auction”, “payment”, and “deposit for payment”. Therefore, under current law, it is preferable to interpret that regardless of the method or intent of performance, if a third-party acquirer makes contribution, the ratio of subrogation by the payer is determined according to the relevant provision. Separately, however, from this interpretation, current legal doctrine on calculating proportionate shares of liability fails to reflect the actual burden of (real property) guarantors in various cases and does not clearly resolve issues concerning parties with dual status as both guarantor and real property guarantor. Thus, legislative solutions are needed to unify the doctrine on calculating proportionate shares of liability by considering the parties' “ordinary security intent” and to clarify that the basis for calculating the burden amount should be the “time of providing/establishing security”.