For purposes of this title, the tax imposed by this paragraph shall be treated as imposed by chapter 1 other than for purposes of determining the amount of any credit allowable under chapter 1 and shall be paid by the partnership. Section
6655 shall be applied to such partnership with respect to such tax in the same manner as if the partnership were a corporation, such tax were imposed by section
11, and references in such section to taxable income were references to the gross income referred to in subparagraph (A).