Harry Blackmun

“ Each appellant has sought to deduct its federal windfall profit tax in calculating "entire net income" for purposes of the New Jersey Corporation Business Tax. Under the applicable New Jersey statute, however, a corporation may not deduct a federal tax that is "on or measured by profits or income." The Supreme Court of New Jersey ruled that the windfall profit tax is a tax "on or measured by profits or income." The question before us is whether, as so construed, the New Jersey provision runs afoul of the Commerce Clause or of the Fourteenth Amendment to the United States Constitution. ”

“ One significant provision of the Act, known as the "net income limitation," places a cap on the amount of a producer's windfall profit that may be taxed each year: "The windfall profit on any barrel of crude oil shall not exceed 90 percent of the net income attributable to such barrel." ”

“ The net income attributable to each barrel is the taxable income derived from the oil removed from a particular property for a given year divided by the number of barrels from that property taken into account for that year. ”