Disallowed business interest expense.
(10) Disallowed business interest expense. The term disallowed business interest expense means the amount of business interest expense for a taxable year in excess of the amount allowed as a deduction for the taxable year under section 163(j)(1) and 1.163(j)-2(b). For purposes of section 163(j) and the regulations in this part under section 163(j) of the Internal Revenue Code (Code) disallowed business interest expense is treated as paid or accrued in the taxable year in which the expense is deductible for Federal income tax purposes (without regard to section 163(j)) or in the taxable year in which a deduction for the business interest expense is permitted under section 163(j), as the context may require.