date. 3. Firearms tax not to apply to cost of smart gun technology (a) In general Section 4181 of the Internal Revenue Code of 1986 is amended by adding at the end the following new sentence: The price taken into account under the preceding sentence shall not include so much of the price of the firearm as is attributable to any smart gun technology (as defined in section 45T(c)(2)) of such firearm. . (b) Effective date The amendment made by this section shall take effect on January 1, 2019.