For purposes of applying section
404 with respect to contributions made to or under a pension, profit-sharing, stock bonus, or annuity plan by a domestic parent corporation, or by another corporation which is entitled to deduct its contributions under section
404
(a)(3)(B), on behalf of an individual who is treated as an employee of such domestic corporation under subsection (a)—
Any amount deductible by a domestic subsidiary under this subsection shall be deductible for its taxable year with or within which the taxable year of such domestic parent corporation ends.