Got a call today that we are getting audited for sales tax here in Minnesota. I did not know that we had to charge sales tax for this service. I did some research and found out thre is a sales tax on everything that we offer except snowplowing. We run a legitimate business and have stayed as as legal as possible (until now). This will be our 3rd full year and have never charged sales tax. We have kept very good records so I am not worried about that part but if anybody has any advice on what they will be checking for or what exactly happens during a audit like this I would greatly appreciate it. We have a cpa do the taxes every year. We try to be as legal as we can and I know it is my fault for not checking on this. (I can only blame myself) Thanks for any advice you can give me.