(a) Paragraph (6) of section 1312 applies if the determination allows or disallows a deduction (including a credit) to a corporation, and if a correlative deduction or credit has been erroneously allowed, omitted, or disallowed in respect of a related taxpayer described in section 1313(c)(7).

(b) The application of paragraph (a) of this section may be illustrated by the following examples:

Example 1.X Corporation is a wholly-owned subsidiary of Y Corporation. In 1955, X Corporation paid $5,000 to Y Corporation and claimed an interest deduction for this amount in its return for 1955. Y Corporation included this amount in its gross income for 1955. In 1958, the Commissioner asserted a deficiency against X Corporation for 1955, contending that the deduction for interest paid should be disallowed on the ground that the payment was in reality the payment of a dividend to Y Corporation. X Corporation contested the deficiency, and ultimately in June 1959, a final decision of the Tax Court sustained the Commissioner. Since the amount of the payment is a dividend, Y Corporation should have been allowed for 1955 the corporate dividends-received deduction under section 243 with respect to such payment. However, the Tax Court's decision sustaining the deficiency against X Corporation occurred after the expiration of the period for filing claim for refund by Y Corporation for 1955. An adjustment is authorized with respect to Y Corporation for 1955. Example 2.Assume the same facts as in example (1) except that, instead of the Commissioner asserting a deficiency against X Corporation for 1955, Y Corporation filed a claim for refund in 1958, alleging that the payment received in 1955 from X Corporation was in reality a dividend to which the corporate dividends-received deduction (section 243) applies. The Commissioner denied the claim, and ultimately in June 1959, the district court, in a final decision, sustained Y Corporation. Since the amount of the payment is a dividend, X Corporation should not have been allowed an interest deduction for the amount paid to Y Corporation. However, the district court's decision sustaining the claim for refund occurred after the expiration of the period of limitations for assessing a deficiency against X Corporation for the year 1955. An adjustment is authorized with respect to X Corporation's tax for 1955. [T.D. 6617, 27 FR 10823, Nov. 7, 1962]