When buying materials like mulch, rock, ect to do a job what qualifies you to be able to buy these items tax free? Like when you go to Tractor Supply Co. and the ask you are you tax exempt at the counter do i say yes if its for my buisness. This will be my first year totally legal and i keep hearing you can buy material tax free. I just dont want to look like a jacka$$ when i tell them i want it tax free and not reall yknow what im talking about. Help on this will be greatly appreciated.