>>14205055"[T]here shall be levied, assessed, collected and paid annually upon the entire net income arising or accruing from all sources in the preceding calendar year to every citizen of the United States, whether residing at home or abroad, and to every person residing in the United States, though not a citizen thereof, a tax of 1 per centum per annum upon such income [...] [T]he net income of a taxable person shall include gains, profits, and income derived from salaries, wages, or compensation for personal service of whatever kind and in whatever form paid, or from professions, vocations, businesses, trade, commerce, or sales, or dealings in property, whether real or personal, growing out of the ownership or use of or interest in real or personal property, also from interest, rent, dividends, securities, or the transaction of any lawful business carried on for gain or profit, or gains or profits and income derived from any source whatever, including the income from but not the value of property acquired by gift, bequest, devise, or descent."
-Revenue act of 1913, page 166-167
https://govtrackus.s3.amazonaws.com/legislink/pdf/stat/38/STATUTE-38-Pg114.pdfUpheld by the supreme court in Brushaber v. Union Pacific Railroad Co., 240 U.S. 1 (1916)
