With the increase in consumer-borrower lawsuits positively considered by the courts for annulment of the so-called “Frank loans,” banks (lenders) are looking for ways to withhold their benefit arising after the “invalidation” of the contract. One of the legal instruments enabling the debtor-creditor to withhold his performance until obtaining counterclaims is the statutory right of retention (ius retentionis) under Article 496 of the Civil Code. The problem arises, however, with qualifying a bank loan agreement as a reciprocal agreement. The aim of the article is to attempt to answer the question whether a bank loan agreement can be classified as a reciprocal agreement and to indicate between which of the benefits resulting from it there is a synallagmatic bond, and consequently whether it is possible to apply Article 496 of the Civil Code?