Abstract: Embodiments provide method and systems for determining business transaction forecast. The method includes receiving plurality of input data streams from multiple sources. The plurality of input data streams includes at least one of demand information and supply information associated with a business entity for which the business transaction forecast is to be determined. The method further includes determining one or more business transaction patterns in the plurality of input data streams. A forecast model is determined from among a plurality of forecast models upon determination of the one or more business transaction patterns, wherein the forecast model provides highest accuracy of the business transaction forecast among the plurality of forecast models. The method includes providing a business transaction forecast output generated based on the forecast model to a processing device of the business entity.