Abstract The indirect Land Use Change (iLUC) impacts of biofuels refer to the effects of additional emissions due to land-use changes triggered by the expansion of energy crops in response to increased biofuel demand. These emissions are mostly greenhouse gases (GHG), thus relevant to the climate change impact category. In order to address these effects, the European Commission (EC) has proposed the inclusion of feedstock type specific iLUC factors for different biofuel sources in the Renewable Energy Sources Directive 2009/28/EC (RED). The goal of this study is to quantify the indirect environmental impacts both in terms of global energy crop land area and the subsequent iLUC, if an additional demand of biofuel in Spain occurs, from a consequential approach. Results show a wide range of GHG emissions, in terms of CO 2 , of biodiesel and bioethanol from iLUC effects, strongly influenced by the place where the potential biofuel is produced. Based on our study, two main aspects -determine the iLUC effects: the dedicated energy crops that are used to produce biofuels and the different coproducts obtained along the biofuels production process. Therefore, contrary to the EC proposal for including a single factor by type of crop, the development of origin-dependent iLUC factors seems to be a more appropriate alternative based on the current assessment. Other aspects that might affect the results, such as crop rotation or field management, have been excluded from the analysis in this work.