Since U. S. Glue Co. v. Town of Oak Creek, 247 U. S. 321, decided in 1918, this Court has uniformly held that a State, in applying a net income tax of general impact to a corporation doing business within its borders, may reach income derived from interstate commerce to the extent that such income is fairly related to corporate activities within the State. See, e. g., Shaffer v. Carter, 252 U. S. 37, 57; Atlantic Coast Line R. Co. v. Daughton, 262 U. S. 413, 416. See also Underwood Typewriter Co. v. Chamberlain, 254 U. S. 113, 119-120; Bass, Ratcliff & Gretton, Ltd., v. State Tax Comm’n, 266 U. S. 271; Norfolk & W. R. Co. v. North Carolina, 297 U. S. 682.
As I read the cases the existence of some income from intrastate business on the part of the taxed corporation, while sometimes adverted to, has never been considered essential to the valid taxation of such “interstate” income. The cases upholding taxes of this kind cannot, in my opinion, properly be said to rest on the theory that the income earned from the carrying on of interstate commerce was not in fact being taxed, but rather was being utilized simply to measure the income derived from some separate, but unidentified, intrastate commerce, which income was in truth the subject of the tax. That this is so seems to me apparent from U. S. Glue itself. There the Court explicitly recognized that the question before it was whether net income from exclusively interstate commerce could be taxed by a State on an apportioned basis together with other income of a corporation. The careful distinction, drawn more than once in the course of the opinion, between gross receipts from interstate commerce, assumed to be immune from state taxation, and net income therefrom, 247 U. S., at 324, 326, 327, 328, 329, would be altogether meaningless if the case is to be explained on the basis suggested by my dissenting brethren, for if all that was in fact being taxed was income from intrastate commerce there is no reason why gross receipts