In the business of every company where resources are spent to create certain effects, costs also appear. Cost represents the monetary expression of resources that should be sacrificed or given up in order to create effects, i.e. added value. The most important division of costs is the division into costs in the long and short term and into explicit and implicit costs. The division of costs into fixed and variable costs is the basic division of costs in the short (and long) term. The analysis of total costs consisting of fixed and variable costs, average costs and marginal cost is particularly important. When analyzing costs, it is important to know the shape of the curves, both of total (fixed and variable), as well as average and marginal costs. The short-term cost analysis was processed on the example of the utility company "Ponikve" d.o.o. for the period from 2021 to 2023. Basic activities of the company "Ponikve" d.o.o. are waste management and energy. An analysis of the most significant business costs, fixed and variable costs, average costs, marginal costs, explicit and implicit costs was conducted, and certain conclusions were drawn based on the analysis. The calculation of average and marginal costs is particularly important in the business decision-making of a company, because management makes numerous strategic decisions based on them.