26 U.S.C. § 25B - U.S. Code - Unannotated Title 26. Internal Revenue Code § 25B. Elective deferrals and IRA contributions by certain individuals

(A) if the adjusted gross income of the taxpayer is not over $30,000, 50 percent,

(B) if the adjusted gross income of the taxpayer is over $30,000 but not over $32,500, 20 percent,

(C) if the adjusted gross income of the taxpayer is over $32,500 but not over $50,000, 10 percent, and

(D) if the adjusted gross income of the taxpayer is over $50,000, zero percent.

(A) a head of household, the applicable percentage shall be determined under paragraph (1) except that such paragraph shall be applied by substituting for each dollar amount therein (as adjusted under paragraph (3)) a dollar amount equal to 75 percent of such dollar amount, and

(B) any taxpayer not described in paragraph (1) or subparagraph (A), the applicable percentage shall be determined under paragraph (1) except that such paragraph shall be applied by substituting for each dollar amount therein (as adjusted under paragraph (3)) a dollar amount equal to 50 percent of such dollar amount.

(A) such dollar amount, multiplied by

(B) the cost-of-living adjustment determined under section 1(f)(3) for the calendar year in which the taxable year begins, determined by substituting “calendar year 2005” for “calendar year 2016” in subparagraph (A)(ii) thereof.

Any increase determined under the preceding sentence shall be rounded to the nearest multiple of $500.

(A) any individual with respect to whom a deduction under section 151 is allowed to another taxpayer for a taxable year beginning in the calendar year in which such individual's taxable year begins, and

(B) any individual who is a student (as defined in section 152(f)(2)).

(A) In general.--The qualified retirement savings contributions determined under paragraph (1) shall be reduced (but not below zero) by the aggregate distributions received by the individual during the testing period from any entity of a type to which contributions under paragraph (1) may be made. The preceding sentence shall not apply to the portion of any distribution which is not includible in gross income by reason of a trustee-to-trustee transfer or a rollover distribution.

(B) Testing period.--For purposes of subparagraph (A), the testing period, with respect to a taxable year, is the period which includes--

(C) Excepted distributions.--There shall not be taken into account under subparagraph (A)--

(D) Treatment of distributions received by spouse of individual.--For purposes of determining distributions received by an individual under subparagraph (A) for any taxable year, any distribution received by the spouse of such individual shall be treated as received by such individual if such individual and spouse file a joint return for such taxable year and for the taxable year during which the spouse receives the distribution.