dollar amount, multiplied by (2) the cost-of-living adjustment determined under section 1(f)(3) for the calendar year in which the taxable year begins, determined by substituting calendar year 2017 for calendar year 1992 in subparagraph (B) thereof. Any increase determined under the preceding sentence shall be rounded to the nearest multiple of $50. . (b) Clerical amendment The table of sections for part III of subchapter B of chapter 1 of such Code is amended by inserting after the item relating to section 139F the following new item: Sec. 139H. Gain from sale or exchange of virtual currency. . (c) Reporting of gains or losses The Secretary shall issue regulations providing for information returns on virtual currency transactions for which gain or loss is recognized. (d) Effective date The amendments made by this section shall apply with respect to transactions entered into after December 31, 2017. 15004. Allowance of deductions and credits relating to expenditures in connection with marijuana sales conducted in compliance with State law (a) In general Section 280E is amended by inserting before the period at the end the following: , unless such trade or business consists of marijuana sales conducted in compliance with State law . (b) Effective date The amendment made by this section shall apply with respect to taxable years ending after the date of the enactment of this Act.