Net income.
(1) Net income. A tax-exempt entity's net income attributable to a prohibited tax shelter transaction is its gross income derived from the transaction reduced by those deductions that are attributable to the transaction and that would be allowed by chapter 1 of the Internal Revenue Code if the tax-exempt entity were treated as a taxable entity for this purpose, and further reduced by taxes imposed by Subtitle D, other than by this section, with respect to the transaction.