Taxable income defined

Except as provided in subsection (b), for purposes of this subtitle, the term “taxable income” means gross income minus the deductions allowed by this chapter (other than the standard deduction). In the case of an individual who does not elect to itemize his deductions for the taxable year, for purposes of this subtitle, the term “taxable income” means adjusted gross income, minus— For purposes of this subtitle— Except as otherwise provided in this subsection, the term “standard deduction” means the sum of— For purposes of paragraph (1), the basic standard deduction is— 200 percent of the dollar amount in effect under subparagraph (C) for the taxable year in the case of— For purposes of paragraph (1), the additional standard deduction is the sum of each additional amount to which the taxpayer is entitled under subsection (f). In the case of any taxable year beginning in a calendar year after 1988, each dollar amount contained in paragraph (2)(B), (2)(C), or (5) or subsection (f) shall be increased by an amount equal to— the cost-of-living adjustment determined under section 1(f)(3) for the calendar year in which the taxable year begins, by substituting for “calendar year 2016” in subparagraph (A)(ii) thereof— In the case of an individual with respect to whom a deduction under section 151 is allowable to another taxpayer for a taxable year beginning in the calendar year in which the individual’s taxable year begins, the basic standard deduction applicable to such individual for such individual’s taxable year shall not exceed the greater of— In the case of— In the case of a taxable year beginning after December 31, 2017— Paragraph (2) shall be applied— Paragraph (4) shall not apply to the dollar amounts contained in paragraphs (2)(B) and (2)(C). In the case of a taxable year beginning after 2025, the $23,625 and $15,750 amounts in subparagraph (A) shall each be increased by an amount equal to— For purposes of this subtitle, the term “itemized deductions” means the deductions allowable under this chapter other than— Unless an individual makes an election under this subsection for the taxable year, no itemized deduction shall be allowed for the taxable year. For purposes of this subtitle, the determination of whether a deduction is allowable under this chapter shall be made without regard to the preceding sentence. Any election under this subsection shall be made on the taxpayer’s return, and the Secretary shall prescribe the manner of signifying such election on the return. Under regulations prescribed by the Secretary, a change of election with respect to itemized deductions for any taxable year may be made after the filing of the return for such year. If the spouse of the taxpayer filed a separate return for any taxable year corresponding to the taxable year of the taxpayer, the change shall not be allowed unless, in accordance with such regulations— The taxpayer shall be entitled to an additional amount of $600— The taxpayer shall be entitled to an additional amount of $600— In the case of an individual who is not married and is not a surviving spouse, paragraphs (1) and (2) shall be applied by substituting “$750” for “$600”. For purposes of this subsection, an individual is blind only if his central visual acuity does not exceed 20/200 in the better eye with correcting lenses, or if his visual acuity is greater than 20/200 but is accompanied by a limitation in the fields of vision such that the widest diameter of the visual field subtends an angle no greater than 20 degrees. For purposes of this section, marital status shall be determined under section 7703.