This research analyses the translation of sale of goods' contracts from the common law systems of the United States, England and Wales into the civil law system of Colombia. It explores the subjects derived from legal translation, comparative law and legal harmonization that influence the translation of these contracts. This is done by keeping a binocular vision that allows translators to compare contract law concepts from both legal families. A timeline vision is also developed to help translators understand the liability-contract relationship, which is crucial to perceive the contract as an entity immersed in commercial translations and law practice. One the links between comparative law and legal translation are firmly established, the analysis as a whole is illustrated with the translation of two contracts. Such translation applies a comprehensive method (based on the works of Prieto Ramos and the functionalist school) that asserts the interdisciplinary nature of legal translation.