The aim of the study is to determine maintenance costs of technical equipment and their influence on business income. In the years 2004-2009 70 agricultural farms were studies in the Biłgoraj County which used EU subsidies for technical modernisation. The annual average usage of means of technical resources in agriculture is presented as the number of working hours per machine. In order to determine maintenance costs of technical resources, the group of farms under study was divided according to the amount of subsidy, to the area of the arable land, to the economic size unit (ESU) and to the income of the farm. The gross income of an agricultural business is calculated as the balance difference between the net value of the production of goods as well as other revenues and direct and indirect costs (gross added value), less taxes, insurance, benefits and other non-material production expenses. The group ordered according to the amount of subsidies showed that greatest maintenance costs in the category of 50 thousand PLN and 50-100 thousand PLN. With a growth of the amount of subsidy, area of AL and the economic size unit saw a simultaneous increase in the maintenance costs. Maintenance costs per one hectare of arable land decrease with an increase in the amount of subsidy, area of AL and the economic size. Whereas an increase in the business income resulted in a simultaneous increase of maintenance costs.