Peldar S. A. is the leader in the glass industry in Colombia, currently has strategic expansion plans, which take place through investment in acquisition and maintenance of machinery. With relevant studies, it was determined that the company doesn’t have an optimal capital structure, which allows to destroy value, and generate high capital opportunity cost. This article aims to design a reference model to determine the optimal capital structure for the acquisition of financial debt, without generating financial default states, supported by its own credit risk model for private companies.