large corporate underpayment
(3) Large corporate underpayment For purposes of this subsection— (A) In general The term “large corporate underpayment” means any underpayment of a tax by a C corporation for any taxable period if the amount of such underpayment for such period exceeds $100,000. (B) Taxable period For purposes of subparagraph (A), the term “taxable period” means— (i) in the case of any tax imposed by subtitle A, the taxable year, or (ii) in the case of any other tax, the period to which the underpayment relates.