The objective of this research work is to determine the opportunity cost incurred by clients when making investment decisions in savings in the commercial banks of Barranquilla, Colombia. For this, a quantitative, non-experimental, field, transectional, descriptive research was carried out, in which the written survey was used as the main means of collecting information, the results of which were analyzed in a statistical system and the documentary analysis. Among the results obtained, it stands out that in most savings investment operations, users of this type of product do not take into account essential aspects such as choosing an appropriate product, the steps to follow to carry out an investment operation. , the criteria for evaluating the product, which allow making the best possible investment decision, which is why it is concluded that a high opportunity cost is incurred in making investment decisions in savings in the commercial bank of Barranquilla, Colombia.