North Carolina Administrative Code Title 17 — Revenue
17 NCAC 07B .3001 — Trade-Ins
Sales or use tax must be computed and paid on the full gross sales price of a new article without any deduction for any trade-in credit or allowance. The sale of a used article by the vendor who accepted it in trade as a credit or part payment on the sale of a new article is also subject to tax at the gross sales price.
Source: official text