I checked out the definition for antique autos and there might be a loop hole dealing with license plate, but it is the government and they can pretty much do what they want. The assessed value figure the used was the one listed in NADA as average retail value so I don’t know how willing they will be to accept actual sales figures, they won’t even take the bill of sale value.
105-330.9. Antique automobiles.
(a) Definition. – For the purpose of this section, the term "antique automobile" means a motor vehicle that meets all of the following conditions:
(1) It is registered with the Division of Motor Vehicles and has an historic vehicle special license plate under G.S. 20-79.4.
(2) It is maintained primarily for use in exhibitions, club activities, parades, and other public interest functions.
(3) It is used only occasionally for other purposes.
(4) It is owned by an individual.
(5) It is used by the owner for a purpose other than the production of income and is not used in connection with a business.
(b) Classification. – Antique automobiles are designated a special class of property under Article V, Sec. 2(2) of the North Carolina Constitution and must be assessed for taxation in accordance with this section. An antique automobile must be assessed at the lower of its true value or five hundred dollars ($500.00). (1995, c 512, s 2; 2009-445, s. 24(a).)