Reg. § 1.547-3 Claim for credit or refund.
(a) If a deficiency in personal holding company tax is asserted for any taxable year, and the corporation has paid any portion of such asserted deficiency, it is entitled to a credit or refund of such payment to the extent that such payment constitutes an overpayment as the result of a deduction for a deficiency dividend as provided in section and through . It should be noted that a determination under section and , of taxpayer's liability for personal holding company tax may take place subsequent to the time the deficiency was paid. To secure credit or refund of such overpayment, the taxpayer must file a claim on Form 843 in addition to the claim for the deduction for deficiency dividends required under section and .
(b) No interest shall be allowed on such credit or refund.
(c) Such credit or refund will be allowed as if, on the date of the determination under section and , two years remained before the expiration of the period of limitation on the filing of claim for refund for the taxable year to which the overpayment relates.