in which the taxable year begins, determined by substituting calendar year 2017 for calendar year 1992 in subparagraph (B) thereof. (ii) Rounding If any amount as adjusted under clause (i) is not a multiple of $500, such amount shall be rounded to the next lowest multiple of $500. (3) Contributions permitted after age 70 ½ Contributions to a Small Business Start-up Savings Account may be made even after the individual for whom the account is maintained has attained age 70 ½ . (4) Rollovers from retirement plans not allowed A taxpayer shall not be allowed to make a qualified rollover contribution to a Small Business Start-up Savings Account from any eligible retirement plan (as defined in section 402(c)(8)(B)), except as may be provided by the Secretary in the case of a rollover from another Small Business Start-up Savings Account. (5) Income based on modified adjusted gross income (A) In general In the case of a taxable year in which the taxpayer’s adjusted gross income exceeds $150,000 ($300,000 in the case of a joint return), the dollar amount in effect for such taxable year under subsection (c)(2) shall be reduced (but not below zero) by the amount determined under subparagraph (B). (B) Amount of reduction The amount determined under this subparagraph shall be the amount which bears the same ratio to such limitation as— (i) the excess of— (I) the taxpayer’s adjusted gross income for such taxable year, over (II) $150,000 ($300,000 in the case of a joint return), bears to (ii) $25,000. (C) Modified adjusted gross income The term modified adjusted gross income means the adjusted gross income of the taxpayer for the taxable year increased by any amount excluded from gross income under section 911, 931, or 933. (d) Treatment of distributions (1) Tax treatment (A) Exclusion of qualified distributions Any qualified distribution from a Small Business Start-up Savings Account shall not be includible in gross income. (B) Inclusion of other distributions Distributions from a Small Business Start-up Savings Account which