The present paper describes the assumptions and modeling structure behind the SRA simulator, a user-friendly computer program developed in cooperation with RMA as a tool to assist policymakers in assessing the economic impact of the Standard Reinsurance Agreement. The simulator uses the historical data on yields, prices, and insurance losses for each district, crop, and insurance product in order to simulate a distribution of the book of business resulting from underwriting crop insurance either in aggregate or for a specific company.