1. Short title This Act may be cited as the Conservation Capital Gains Exclusion Act of 2018 . 2. Exclusion of gain from sale of land or qualified real property interests for conservation purposes (a) In general Part III of subchapter B of chapter 1 of the Internal Revenue Code of 1986 is amended by inserting before section 140 the following new section: 139H. Gain from sale of land or qualified real property interests for conservation purposes (a) In general Gross income shall not include any gain from the sale of land or a qualified real property interest to a qualified organization exclusively for conservation purposes. (b) Definitions For purposes of this section— (1) Qualified real property interest (A) In general The term qualified real property interest means any of the following interests in real property: (i) The entire interest of the taxpayer. (ii) A remainder interest. (iii) A restriction (granted in perpetuity) on the use which may be made of the real property. (B) Special rule for mineral interests An interest in real property shall not fail to be treated as a qualified real property interest solely by reason of a retention of a qualified mineral interest. (2) Qualified organization; conservation purposes The terms qualified organization and conservation purpose shall have the respective meanings given such terms by section 170(h). . (b) Clerical amendment The table of sections for part III of subchapter B of chapter 1 of such Code is amended by inserting before the item relating to section 140 the following new item: Sec. 139H. Gain from sale or grant of conservation easement. . (c) Effective date The amendments made by this section shall apply to taxable years beginning after the date of the enactment of this Act.