We are a car wash repair company in Tennessee. We go to locations and repair broken equipment or install needed equipment. We charge sales tax on any products used for the repair or any equipment sold. Is it appropriate to charge sales tax on labor? I have been told with much uncertainty by my local clerk's office that they "thought" we had to, but other businesses have told us that they don't charge sales tax on labor for our line of work. Any guidance on this issue would be most appreciated! Thanks for your help!!