When I got my EIN last year I thought it was to help me identify my business and to avoid paying sales tax like when farmers buy a piece of machinery. I tried to buy a mower and they said they would not take off sales tax and would only honor it if I were "tax exempt from the dept. of revenue." Sooo, what number do I need to not pay sales taxes on stuff like that? I called IRS and the Dept of Revenue and no one can help me.