The Spanish Commercial Code , a cornerstone of business law in Spain, meticulously regulates the various facets of commercial transactions and relationships. Among its crucial provisions, Book II, dedicated to Contracts and Obligations in General, contains Title XIII, which specifically addresses the intricacies of commercial loans. This section is vital for understanding the legal framework governing financial agreements between businesses and individuals within a commercial context, differentiating them from civil loans and establishing specific rules for their execution, interest, and restitution. This comprehensive analysis delves into the specific articles of Title XIII, providing a detailed breakdown of each provision, its legal implications, and its practical application in the contemporary business landscape. From the enforceability of indefinite loans to the calculation of interest and the presumption of gratuity, these articles form the bedrock of commercial lending in Sp...