The paper presents model solutions of the financial consequences of replacing farming tax with income-tax in farms with different types of activity in “Greater Poland and Silesia” region. Farmers from “dairy cattle” farms would in vast majority pay higher income tax than farming tax, the highest in the groups with area 75-125 hectare. However, farms with “granivores” agricultural type there as no income subject to taxation. In remaining area groups of farms of this type, the income tax amount grew proportionally to decrease in cropland area, and was higher than the amount of farming tax. It may result from higher intensity of the production due to usage of purchased protein feeds, what contributes to attaining additional income irrespective of the possessed area of cropland.