(a) The provisions of the Internal Revenue Code as now in effect or hereafter amended mentioned in this chapter are incorporated in this chapter by reference and have effect as though fully set out in this chapter.
(b) When portions of the Internal Revenue Code incorporated by reference as provided in (a) of this section refer to rules and regulations adopted by the United States Commissioner of Internal Revenue, or hereafter adopted, they are regarded as regulations adopted by the department under and in accord with the provisions of this chapter, unless and until the department adopts specific regulations in place of them conformable with this chapter.