To the extent that such distribution is not necesasry under the determination (when made under paragraph (c) of this section) for a deficiency distribution, it shall be included in the United States shareholder's gross income for the taxable year of receipt of such distribution and paragraph (g) of this section shall not apply.
for the taxable year of the election has not been distributed on the stock with respect to which the election was made, then a distribution, in order to be counted toward a deficiency distribution, must be made by such corporation or corporations and from such earnings and profits to the extent thereof. Once all such earnings and profits of such corporation or corporations have been completely distributed, a deficiency distribution may be made from other earnings and profits of such foreign corporation which was a single first-tier corporation, or of such corporation or corporations which were in such chain or group, as the case may be.
26 C.F.R. §1.963-6