The circuit of the goods and money determine the economic development of the society. Environment of market economy contributes to the number of concluded contracts increasing, as a result, the number of money obligations. Money obligation represents the duty, of the legal or natural person, to transmit a certain sum of money to another person. If debtor breaches that obligation, legal provision settle specific consequences for such situations. These consequences are stipulated in article 619 Civil code of Republic of Moldova. This article provides that delay in payment of money obligations, means the debtor responsibility expressed in money interest. Provisions from art.619 CC of RM should be examined in relation with art.585 CC of RM, but it is necessary to distinguish these two regulations because each of them should be applied in separate way, because of their specific juridical nature.