Special rules for determining aggregate amounts

notwithstanding the disregard in subparagraph (A)(i) of any disallowance under paragraph (1), in the case of any loss which is carried forward under paragraph (2) from any taxable year, such loss (or any portion thereof) shall be taken into account for the first taxable year in which a deduction for such loss (or portion) is not disallowed by reason of this subsection, and

the Secretary shall prescribe rules for the computation of the aggregate amounts described in such clause in cases where the filing status of the taxpayer is not the same for the taxable year and each of the taxable years in the period described in such clause.