disaster contribution means any charitable contribution if— (I) such contribution is for relief efforts related to a federally declared disaster (as defined in section 165(h)(3)(C)(i)), (II) such contribution is made during the period beginning on the applicable disaster date with respect to the disaster described in subclause (I) and ending on December 31, 2015, and (III) such contribution is made in cash to an organization described in subparagraph (A) (other than an organization described in section 509(a)(3)). Such term shall not include a contribution if the contribution is for establishment of a new, or maintenance in an existing, donor advised fund (as defined in section 4966(d)(2)). (v) Applicable disaster date For purposes of clause (iv)(II), the term applicable disaster date means, with respect to any federally declared disaster described in clause (iv)(I), the date on which the disaster giving rise to the Presidential declaration described in section 165(i)(5)(A) occurred. (vi) Substantiation requirement This paragraph shall not apply to any qualified disaster contribution unless the taxpayer obtains from such organization to which the contribution was made a contemporaneous written acknowledgment (within the meaning of subsection (f)(8)) that such contribution was used (or is to be used) for a purpose described in clause (iv)(III). . (b) Corporations (1) In general Paragraph (2) of section 170(b) of the Internal Revenue Code of 1986 is amended by redesignating subparagraph (C) as subparagraph (D) and by inserting after subparagraph (B) the following new subparagraph: (C) Qualified disaster contributions (i) In general Any qualified disaster contribution shall be allowed to the extent that the aggregate of such contributions does not exceed the excess of 20 percent of the taxpayer's taxable income over the amount of charitable contributions allowed under subparagraph (A). (ii) Carryover If the aggregate amount of contributions described in clause (i) exceeds the limitation under clause (i), such