Long-term contracts.
(3) Long-term contracts. In the case of a taxpayer accounting for advance payments for tax purposes pursuant to a long-term contract method of accounting under 1.460-4, or of a taxpayer accounting for advance payments with respect to a long-term contract pursuant to an accrual method of accounting referred to in the succeeding sentence, advance payments shall be included in income in the taxable year in which properly included in gross receipts pursuant to such method of accounting (without regard to the financial reporting requirement contained in subparagraph (1)(ii) (a) or (b) of this paragraph). An accrual method of accounting to which the preceding sentence applies shall consist of any method of accounting under which the income is accrued when, and costs are accumulated until, the subject matter of the contract (or, if the subject matter of the contract consists of more than one item, an item) is shipped, delivered, or accepted.