GNP implicit price deflator
(3) Inflation adjustment (A) In general In the case of any taxable year beginning in a calendar year after 1991, there shall be substituted for the $28 amount under paragraph (1)(A) an amount equal to the product of— (i) $28, multiplied by (ii) the inflation adjustment factor for such calendar year. (B) Inflation adjustment factor The term “inflation adjustment factor” means, with respect to any calendar year, a fraction the numerator of which is the GNP implicit price deflator for the preceding calendar year and the denominator of which is the GNP implicit price deflator for 1990. For purposes of the preceding sentence, the term “GNP implicit price deflator” means the first revision of the implicit price deflator for the gross national product as computed and published by the Secretary of Commerce. Not later than April 1 of any calendar year, the Secretary shall publish the inflation adjustment factor for the preceding calendar year.
26 USC § 43(b)(3)
None identified, default scope is assumed to be the parent (subpart D) of this section.