income of the taxpayer for the taxable year in excess of the threshold amount, bears to (ii) $50,000 ($100,000 in the case of a joint return). (e) Other definitions For purposes of this section— (1) Taxable income Taxable income shall be computed without regard to the deduction allowable under this section. (2) Threshold amount (A) In general The term threshold amount means $250,000 (200 percent of such amount in the case of a joint return). (B) Inflation adjustment In the case of any taxable year beginning after 2018, the dollar amount in paragraph (1) shall be increased by an amount equal to— (i) such dollar amount, multiplied by (ii) the cost-of-living adjustment determined under section 1(f)(3) for the calendar year in which the taxable year begins. If any amount as increased under the preceding sentence is not a multiple of $1,000, such amount shall be rounded to the nearest multiple of $1,000. (3) Qualified REIT dividend The term qualified REIT dividend means any dividend from a real estate investment trust received during the taxable year which— (A) is not a capital gain dividend, as defined in section 857(b)(3), and (B) is not qualified dividend income, as defined in section 1(h)(11). (4) Qualified cooperative dividend The term qualified cooperative dividend means any patronage dividend (as defined in section 1388(a)), any per-unit retain allocation (as defined in section 1388(f)), and any qualified written notice of allocation (as defined in section 1388(c)), or any similar amount received from an organization described in subparagraph (B)(ii), which— (A) is includible in gross income, and (B) is received from— (i) an organization or corporation described in section 501(c)(12) or 1381(a), or (ii) an organization which is governed under this title by the rules applicable to cooperatives under this title before the enactment of subchapter T. (f) Special rules (1) Application topartnerships and S corporations (A) In general In the case of a partnership or S corporation— (i) this section shall be applied at