I'm not sure what gives you the actual status to receive farm tax, it might be how how your official business is written up and how income is made off of your property like Big Fin said. Another benefit to the AG tax is sales tax is a different rate, that's not an issue in Montana, but when I buy parts and equipment for the dairy I work for here in California the sales tax drops from 7.5% to 2.25%. It doesn't apply at a place like Lowe's, but tractor shops, local hardware stores, hydraulic shops etc all give us the Ag tax rate. It also qualifies us to get off road diesel delivered, which is a huge difference in price with how high taxes are on fuel in California.