(1) There shall be subtracted six hundred dollars as the West Virginia personal exemption of the estate or trust, and there shall be added the amount of its federal deduction for a personal exemption.
(2) There shall be added or subtracted, as the case may be, the share of the estate or trust in the West Virginia fiduciary adjustment determined under section nineteen of this article.
(3) There shall be added to federal adjusted gross income, unless already included therein, the amount of a lump sum distribution for which the taxpayer has elected under Section 402(e) of the Internal Revenue Code of 1986, as amended, to be separately taxed for federal income tax purposes: Provided, That the provisions of this subdivision shall first be effective for taxable years beginning after the thirty-first day of December, one thousand nine hundred ninety.
(4) There shall be added by an electing small business trust as defined in Section 1361(e) of the Internal Revenue Code of 1986, as amended, which is a shareholder in one or more electing small business corporations, the portion of the trust's income attributable to electing small business corporation stock held by the trust that is not included in the trust's federal taxable income pursuant to Section 641 of the Internal Revenue Code of 1986, as amended.
(b) The amendments to this section enacted in the regular session of the Legislature in two thousand five are effective for tax years beginning on or after the first day of January, two thousand five.