When such a resolution or ordinance is submitted to the Department of Revenue, the Department may approve it or disapprove it in whole or in part if, in the opinion of the Department, the discounts or the periods of time for which discounts are allowed are excessive or unreasonable. Such a resolution or ordinance, once adopted and approved by the Department of Revenue, shall continue in effect until repealed. Nothing in this subsection (c) shall prevent the governing body of any taxing unit from providing by resolution that the schedule of discounts for prepayment of taxes in effect in the taxing unit on June 30, 1971, shall continue in effect through November 1, 1971, but no longer.
N.C. Gen. Stat. § 105-360