26 U.S.C. § 86 — Social security and tier 1 railroad retirement benefits
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In the case of a taxpayer with respect to whom the amount determined under subsection (b)(1)(A) exceeds the adjusted base amount, the amount included in gross income under this section shall be equal to the lesser of— (A) the sum of— (i) 85 percent of such excess, plus (ii) the lesser of the amount determined under paragraph (1) or an amount equal to one-half of the difference between the adjusted base amount and the base amount of the taxpayer, or (B) 85 percent of the social security benefits received during the taxable year.
(b) Taxpayers to whom subsection (a) applies › (1) In general A taxpayer is described in this subsection if— (A) the sum of— (i) the modified adjusted gross income of the taxpayer for the taxable year, plus (ii) one-half of the social security benefits received during the taxable year, exceeds (B) the base amount.
(b) Taxpayers to whom subsection (a) applies › (2) Modified adjusted gross income For purposes of this subsection, the term “modified adjusted gross income” means adjusted gross income— (A) determined without regard to this section and sections 85(c), 135, 137, 221, 911, 931, and 933, and (B) increased by the amount of interest received or accrued by the taxpayer during the taxable year which is exempt from tax.
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