Members of controlled group
(d) Members of controlled group(1) In general. For purposes of applying paragraph (a) of this section, the taxable income of members of a controlled group of corporations (as defined in section 1563(a)) must be aggregated for each year of the testing period. The provisions of this section do not apply to a controlled group for any taxable year in which the aggregate taxable income of the members of the controlled group is less than $1,000,000. (2) Aggregation. For purposes of paragraph (d)(1) of this section, a taxable loss of any member of the controlled group for a taxable year during the testing period is not taken into account. (3) Allocation rule. If the aggregate taxable income of members of a controlled group computed pursuant to paragraph (d)(1) of this section exceeds $1,000,000 during the testing period, the $1,000,000 amount that is relevant for purposes of determining, under paragraph (a)(1) of this section, whether a corporation is a large corporation is divided equally among the component members of such group (including component members excluded pursuant to paragraph (d)(2) of this section) unless all of such component members consent to an apportionment plan providing for an alternative allocation of such amount. The procedure for making and filing this plan will be the same as the procedure used for making and filing an apportionment plan under section 1561. See section 1561 and the regulations. (4) Controlled group members. (i) In the case of any corporation that was a member of a controlled group of corporations at any time during the testing period but is not a member of such group during the taxable year involved, the taxable income of the former member for the testing period is determined as if such corporation were not a member of a group at any time during that period. With respect to the controlled group, the taxable income of its former member will not be taken into account in determining such group's taxable income for any taxable year during the testing period for purposes of applying paragraph (a)(1) of this section. (ii) For purposes of paragraph (d)(4)(i) of this section, the determination of whether a corporation is a member of a controlled group during the testing period is based on whether the corporation was a member of the controlled group on the last day of the month preceding the due date of the required installment.