A study to determine factors affecting adoption of IFS and contribution to enhancing of farmers income was undertaken during 2018-19 in in Belagavi and Vijayapur district by following ex post-facto research design. The data was collected by personal interview method with help of structured schedule.Snowball technique was used to identify30 farmers practicing IFS in two districts. Thirty farmers and 12 farmers not practicing modern agricultural technology were selected for comparison of cost and returns.The results found that equal percentage (26.67 %) of farmers adopted the integrated farming system including the combination of field crop+ animal husbandry+ horticulture crop. While study found that education, land holding, information seeking behavour, scientific orientation and progressiveness of the farmer had contributed to adoption of integrated farming system. Further, integrated farming system with combination of field crops + animal husbandry + horticultural crop + vermicomposting contributed more to income (`115807.02 and 116570.45) when compared to growing only filed crop (` 51573.45 and 40346.56) in Belagavi and Vijayapur district, respectively. High wage rates and non-availability of inputs were the major constraints faced by integrated farming system adopted farmers.