The Constitution gives the power to Congress, and Congress alone, to regulate commerce with foreign nations. This means the individual states cannot regulate commerce with foreign nations. This concept is known as the Foreign Commerce Clause. While it seldom comes up in the area of state taxation, the Foreign Commerce Clause states, “Congress shall have Power . . . To regulate Commerce with foreign Nations, and among the several States . . .” This idea seems fairly simple conceptually, however, it can be difficult in practice to determine whether a state tax impedes on Foreign Commerce.
Since 2009, Indiana has been wrestling whether a provision of its state corporate income tax impermissibly burdens interstate commerce. Specifically, Caterpillar Inc., the world’s largest manufacturer of construction and mining equipment, took exception with a portion of Indiana’s corporate income tax law. As it turned out, Caterpillar incorporated in Delaware and had its headquarters in Peoria, Illinois and had one of its many plants in Lafayette Indiana. It also happened to own some 250 subsidiaries, most of which were foreign corporations.
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