In Australia and India, both biofuels are subject to the same import tariff rates. It focuses on two key elements. The first section discusses the economic model used for the analysis, highlighting in particular the elements of the model most relevant for modelling the analysed stages in the supply chain, i.e. the markets for fertilisers, agricultural products and biofuels, as well as the representation of fertiliser and biofuel supply policies. The second section outlines the reference and various counterfactual scenarios calculated, presents some of the key assumptions and discusses the way the implications of fertiliser and biofuel policies for markets and agricultural incomes are assessed.