(b) The term "Internal Revenue Code of 1986" means the Internal Revenue Code of the United States enacted by the federal Tax Reform Act of 1986 and includes the provisions of law formerly known as the Internal Revenue Code of 1954, as amended, and in effect when the federal Tax Reform Act of 1986 was enacted that were not amended or repealed by the federal Tax Reform Act of 1986. Except when inappropriate, any reference in any law, executive order or other document:
(1) To the Internal Revenue Code of 1954 includes a reference to the Internal Revenue Code of 1986; and
(2) To the Internal Revenue Code of 1986 includes a reference to the provisions of law formerly known as the Internal Revenue Code of 1954.
(c) Effective date. -- The amendments to this section enacted in the year 2009 are retroactive to the extent allowable under federal income tax law. With respect to taxable years that began prior to January 1, 2010, the law in effect for each of those years shall be fully preserved as to that year, except as provided in this section.