I was told at the coo-op that when I bought my feed for my chickens that if I owned 5 acres of land that I could apply for a tax number to keep from having to pay taxes on my feed. Is this true? If so, how do I go about doing that? Do you really have to have 5 acres or can you own 1 acre and a very large chicken supply? Can you use this tax number for building supplies at Lowes or any other builing supply store, or use it to pay for groceries or for your gasoline?