Within the present paper we shall analyze the relation between the nature of the contract and the management of the economic entity, by taking as an example the case of contracts that contain payments in advance, the case of concession contracts, the case of contracts that include withholding of warranties for good execution. The nature of the contract between the buyer and the seller is influenced by: the range of contracted products, the responsibility of the contracting parties, the risk involved and the means of payment. All these elements convey a large variety of forms of contracts with influences upon the company's taxation and accounting.