N.C. Gen. Stat. § 47A-20
The manager or board of directors, or other form of administration provided in the bylaws, as the case may be, shall keep detailed, accurate records in chronological order of the receipts and expenditures affecting the common areas and facilities, specifying and identifying the maintenance and repair expenses of the common areas and facilities and any other expense incurred. Both said book and the vouchers accrediting the entries thereupon shall be available for examination by all the unit owners, their duly authorized agents or attorneys, at convenient hours on working days that shall be set and announced for general knowledge. All books and records shall be kept in accordance with good and accepted accounting practices and an outside audit shall be made at least once a year.
N.C. Gen. Stat. § 47A-20