The paper constitutes an attempt at modelling the farmers’ income distribution. The main objective of the paper was to assess the impact of crop diversity on famers income probability distribution on the basis of real life data(Polish FADN), and to evaluate the size of economic incentives needed in order to encourage farmers to diversify their crop structure. Multiple linear regression and quantile regression models were developed for variance and expected value of farmers’ income. It was revealed that the impact of crop diversity diminishes both variance and expected value of income. However the relation holds only for two of considered principal farming types.