The problems of agricultural development for small and medium enterprises (SMEs) are considered. The features of modeling business processes in agriculture are analyzed. A financial decision support system is proposed to increase sustainability and reduce risks in the development of agricultural SMEs. The software modules are based on TEO-INVEST. The developed financial decision support system takes into account the specifics of business processes in agriculture: duration of the production cycle exceeding the planning period, accounting for complex processing technology, the use of financial leasing for the purchase of agricultural machinery, etc.