FARMIS is a comparative-static process-analytical programming model based on FADN data for the German agricultural sector. Recent developments cover the areas of the modelling of land, premia and quota markets, and the creation of a generic model design and structure which allow the use of different databases such as the EU FADN. The impact on the German agricultural sector of 2003 CAP Reform is analysed for both the Single Farm Payment (SFP) and the national implementation (Regional Model: RM). The analysis shows that the impacts of both decoupling schemes on factor allocation and corresponding supply are similar, but differ with respect to income effects. The rental prices of milk quota decrease in both scenarios. While land prices are predicted to decrease under the SFP, in the case of the RM rental prices for grassland increase significantly.