54 STAT.] 76TH CONG. , 3D SESS.-CH. 757-OCT. 8, 1940 be an amount equal to the sum of (a) the money plus (b) the aggre- gate of the adjusted basis of the assets of the taxpayer held by the taxpayer at such time, such sum being reduced by the indebtedness outstanding at such time. The amount of the money, assets, and indebtedness at such time shall be determined in accordance with rules and regulations prescribed by the Commissioner with the approval of the Secretary. In such case, the equity invested capital for each day after the beginning of the taxpayer's first taxable year under this subchapter shall be determined, in accordance with rules and regulations prescribed by the Commissioner with the approval of the Secretary, using as the basic figure the equity invested capital as so determined. "SEC. 724. FOREIGN CORPORATIONS AND CORPORATIONS ENTITLED TO BENEFITS OF SECTION 251-INVESTED CAPITAL. "Notwithstanding section 715, in the case of a foreign corporation engaged in trade or business within the United States or having an office or place of business therein, and in the case of a corporation entitled to the benefits of section 251, the invested capital for any taxable year shall be determined in accordance with rules and regu- lations prescribed by the Commissioner with the approval of the Secretary, under which- "(a) GENERAL RuLE. -T he daily invested capital for any day of the taxable year shall be the aggregate of the adjusted basis of each United States asset held by the taxpayer on the beginning of such day. In the application of section 720 in reduction of the average invested capital (determined on the basis of such daily invested capital), the terms 'admissible assets' and 'inadmissible assets' shall include only United States assets; or "(b)ExcmEProN.- If the Commissioner determines that the United States assets of the taxpayer cannot satisfactorily be segregated from its other assets, the invested capital for the taxable year shall be an amount which is the same percentage of the aggregate of the adjusted basis of all assets held by the taxpayer as of the end of the last day of the taxable year which the net income for the tax- able year from sources within the United States is of the total net income of the taxpayer for such year. "(c) DEFINITION OF UNITED STATES ASSET. - As used in this sub- section, the term 'United States asset' means an asset held by the taxpayer in the United States, determined in accordance with rules and regulations prescribed by the Commissioner with the approval of the Secretary. "SEC. 725. PERSONAL SERVICE CORPORATIONS. "(a) DEFINrmON. -As used in this subchapter, the term 'personal service corporation' means a corporation whose income is to be ascribed primarily to the activities of shareholders who are regularly engaged in the active conduct of the affairs of the corporation and are the owners at all times during the taxable year of at least 70 per centum in value of each class of stock of the corporation, and in which capital is not a material income-producing factor; but does not include any foreign corporation, nor any corporation 50 per centum or more of whose gross income consists of gains, profits, or income derived from trading as a principal. For the purposes of this subsection, an individual shall be considered as owning, at any time, the stock owned at such time by his spouse or minor child or by any guardian or trustee representing them. 987 Determination ofin- vested capital. Ante, p. 982. 53 Stat. 79. 26 U.S . C., Supp.V, 251. General rule. Ante, p. 985. Exception. " United States as- set" defined. Definition.