In all counties having a tax commission or comparable agency, the commission or agency shall, except for levying taxes, perform all the duties required by this Subchapter to be performed by the board of equalization and review and the board of county commissioners. All expenses incurred by the tax commission or agency or its appointees in accordance with this Subchapter shall be paid by the county. Pursuant to Article VI, Sec. 9, of the North Carolina Constitution, the office of member of a tax commission or comparable agency is hereby declared to be an office that may not be held concurrently with any other elective or appointive office. (1939, c. 310, s. 410; 1971, c. 806, s. 1.)