In the case of a parent making the election under this paragraph—
(i) the gross income of each child to whom such election applies (to the extent the gross income of such child exceeds twice the amount described in paragraph (4)(A)(ii)(I)) shall be included in such parent’s gross income for the taxable year,
(ii) the tax imposed by this section for such year with respect to such parent shall be the amount equal to the sum of—
(iii) any interest which is an item of tax preference under section 57(a)(5) of the child shall be treated as an item of tax preference of such parent (and not of such child).
The Secretary shall prescribe such regulations as may be necessary or appropriate to carry out the purposes of this paragraph.