What happens if NC State University mistakenly pays sales tax on purchases? If the University mistakenly pays sales tax, the department must work with the supplier to be issued a refund. The University cannot obtain a refund by any other method (i.e., NC Dept. of Revenue, county tax office, etc.). Read more: University Controller’s Office, Tax Q&A Updated on May 3, 2022 Tagged: Sales tax exemptiontax exemption Was this article helpful? Yes No Need Support?Can't find the answer you're looking for?Contact Support