This article examines the issue of non-performance of the most common civil contracts: purchase and sale, lease, and provision of services for a fee. Based on an analysis of civil law practice, various forms of non-performance of contractual obligations are examined, including failure to deliver goods, failure to pay rent, and improper performance of services. The legal consequences arising from non-performance of obligations, such as compensation for damages, termination of the contract, and the application of penalties, are examined in detail. Using a formal legal approach, methods for protecting the rights of the parties are revealed, including filing claims, filing lawsuits, and using mediation. In conclusion, the authors emphasize the importance of parties understanding their rights and obligations to minimize risks and ensure compliance with contractual terms in civil law.