This study examined the relationship between language difficulties and learner's errors in financial mathematics, and it employed a quantitative research approach using a case study design. The population for the study consisted of all grade 10 mathematical literacy (ML) learners from three selected schools in East London District, from which 40 learners and two ML teachers were randomly selected from each school. Data was collected using a content-based questionnaire and structured questionnaires. Descriptive statistics were used to analyze the questionnaires. Hence, the findings revealed a significant relationship between language difficulties and the errors committed by learners. As a result of the findings, the study recommended, among other things, that teachers incorporate error analysis into the planning of their lessons to understand why students make mistakes and how to prevent them.