This article studies the determinants of the financing decisions of small and medium enterprises (SMEs), which we characterize through three cases: trade-off behavior, pecking order, and extreme aversion to debt. We test our hypotheses using a datas et of firms from Bahía Blanca (Argentina) for two years: 2006 and 2010. We find that firm characteristics related to information asymmetries, such as firm age, size, and legal form; and personal factors, such as owner’s age and education; and perception of emotional bankruptcy costs, are relevant variables in SME financing behavior. The recognition of extreme aversion to debt motivates reconsideration of the underleverage problem of SMEs.